drivers/gpu/drm/bridge/sil-sii8620.c

   1 /*
   2  * Silicon Image SiI8620 HDMI/MHL bridge driver
   3  *
   4  * Copyright (C) 2015, Samsung Electronics Co., Ltd.
   5  * Andrzej Hajda <a.hajda@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <asm/unaligned.h>
  13
  14 #include <drm/bridge/mhl.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_edid.h>
  17 #include <drm/drm_encoder.h>
  18
  19 #include <linux/clk.h>
  20 #include <linux/delay.h>
  21 #include <linux/extcon.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/i2c.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/kernel.h>
  27 #include <linux/list.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/of_graph.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/slab.h>
  33
  34 #include <media/rc-core.h>
  35
  36 #include "sil-sii8620.h"
  37
  38 #define SII8620_BURST_BUF_LEN 288
  39 #define VAL_RX_HDMI_CTRL2_DEFVAL VAL_RX_HDMI_CTRL2_IDLE_CNT(3)
  40
  41 #define MHL1_MAX_PCLK 75000
  42 #define MHL1_MAX_PCLK_PP_MODE 150000
  43 #define MHL3_MAX_PCLK 200000
  44 #define MHL3_MAX_PCLK_PP_MODE 300000
  45
  46 enum sii8620_mode {
  47         CM_DISCONNECTED,
  48         CM_DISCOVERY,
  49         CM_MHL1,
  50         CM_MHL3,
  51         CM_ECBUS_S
  52 };
  53
  54 enum sii8620_sink_type {
  55         SINK_NONE,
  56         SINK_HDMI,
  57         SINK_DVI
  58 };
  59
  60 enum sii8620_mt_state {
  61         MT_STATE_READY,
  62         MT_STATE_BUSY,
  63         MT_STATE_DONE
  64 };
  65
  66 struct sii8620 {
  67         struct drm_bridge bridge;
  68         struct device *dev;
  69         struct rc_dev *rc_dev;
  70         struct clk *clk_xtal;
  71         struct gpio_desc *gpio_reset;
  72         struct gpio_desc *gpio_int;
  73         struct regulator_bulk_data supplies[2];
  74         struct mutex lock; /* context lock, protects fields below */
  75         int error;
  76         unsigned int use_packed_pixel:1;
  77         enum sii8620_mode mode;
  78         enum sii8620_sink_type sink_type;
  79         u8 cbus_status;
  80         u8 stat[MHL_DST_SIZE];
  81         u8 xstat[MHL_XDS_SIZE];
  82         u8 devcap[MHL_DCAP_SIZE];
  83         u8 xdevcap[MHL_XDC_SIZE];
  84         bool feature_complete;
  85         bool devcap_read;
  86         bool sink_detected;
  87         struct edid *edid;
  88         unsigned int gen2_write_burst:1;
  89         enum sii8620_mt_state mt_state;
  90         struct extcon_dev *extcon;
  91         struct notifier_block extcon_nb;
  92         struct work_struct extcon_wq;
  93         int cable_state;
  94         struct list_head mt_queue;
  95         struct {
  96                 int r_size;
  97                 int r_count;
  98                 int rx_ack;
  99                 int rx_count;
 100                 u8 rx_buf[32];
 101                 int tx_count;
 102                 u8 tx_buf[32];
 103         } burst;
 104 };
 105
 106 struct sii8620_mt_msg;
 107
 108 typedef void (*sii8620_mt_msg_cb)(struct sii8620 *ctx,
 109                                   struct sii8620_mt_msg *msg);
 110
 111 typedef void (*sii8620_cb)(struct sii8620 *ctx, int ret);
 112
 113 struct sii8620_mt_msg {
 114         struct list_head node;
 115         u8 reg[4];
 116         u8 ret;
 117         sii8620_mt_msg_cb send;
 118         sii8620_mt_msg_cb recv;
 119         sii8620_cb continuation;
 120 };
 121
 122 static const u8 sii8620_i2c_page[] = {
 123         0x39, /* Main System */
 124         0x3d, /* TDM and HSIC */
 125         0x49, /* TMDS Receiver, MHL EDID */
 126         0x4d, /* eMSC, HDCP, HSIC */
 127         0x5d, /* MHL Spec */
 128         0x64, /* MHL CBUS */
 129         0x59, /* Hardware TPI (Transmitter Programming Interface) */
 130         0x61, /* eCBUS-S, eCBUS-D */
 131 };
 132
 133 static void sii8620_fetch_edid(struct sii8620 *ctx);
 134 static void sii8620_set_upstream_edid(struct sii8620 *ctx);
 135 static void sii8620_enable_hpd(struct sii8620 *ctx);
 136 static void sii8620_mhl_disconnected(struct sii8620 *ctx);
 137 static void sii8620_disconnect(struct sii8620 *ctx);
 138
 139 static int sii8620_clear_error(struct sii8620 *ctx)
 140 {
 141         int ret = ctx->error;
 142
 143         ctx->error = 0;
 144         return ret;
 145 }
 146
 147 static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
 148 {
 149         struct device *dev = ctx->dev;
 150         struct i2c_client *client = to_i2c_client(dev);
 151         u8 data = addr;
 152         struct i2c_msg msg[] = {
 153                 {
 154                         .addr = sii8620_i2c_page[addr >> 8],
 155                         .flags = client->flags,
 156                         .len = 1,
 157                         .buf = &data
 158                 },
 159                 {
 160                         .addr = sii8620_i2c_page[addr >> 8],
 161                         .flags = client->flags | I2C_M_RD,
 162                         .len = len,
 163                         .buf = buf
 164                 },
 165         };
 166         int ret;
 167
 168         if (ctx->error)
 169                 return;
 170
 171         ret = i2c_transfer(client->adapter, msg, 2);
 172         dev_dbg(dev, "read at %04x: %*ph, %d\n", addr, len, buf, ret);
 173
 174         if (ret != 2) {
 175                 dev_err(dev, "Read at %#06x of %d bytes failed with code %d.\n",
 176                         addr, len, ret);
 177                 ctx->error = ret < 0 ? ret : -EIO;
 178         }
 179 }
 180
 181 static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
 182 {
 183         u8 ret;
 184
 185         sii8620_read_buf(ctx, addr, &ret, 1);
 186         return ret;
 187 }
 188
 189 static void sii8620_write_buf(struct sii8620 *ctx, u16 addr, const u8 *buf,
 190                               int len)
 191 {
 192         struct device *dev = ctx->dev;
 193         struct i2c_client *client = to_i2c_client(dev);
 194         u8 data[2];
 195         struct i2c_msg msg = {
 196                 .addr = sii8620_i2c_page[addr >> 8],
 197                 .flags = client->flags,
 198                 .len = len + 1,
 199         };
 200         int ret;
 201
 202         if (ctx->error)
 203                 return;
 204
 205         if (len > 1) {
 206                 msg.buf = kmalloc(len + 1, GFP_KERNEL);
 207                 if (!msg.buf) {
 208                         ctx->error = -ENOMEM;
 209                         return;
 210                 }
 211                 memcpy(msg.buf + 1, buf, len);
 212         } else {
 213                 msg.buf = data;
 214                 msg.buf[1] = *buf;
 215         }
 216
 217         msg.buf[0] = addr;
 218
 219         ret = i2c_transfer(client->adapter, &msg, 1);
 220         dev_dbg(dev, "write at %04x: %*ph, %d\n", addr, len, buf, ret);
 221
 222         if (ret != 1) {
 223                 dev_err(dev, "Write at %#06x of %*ph failed with code %d.\n",
 224                         addr, len, buf, ret);
 225                 ctx->error = ret ?: -EIO;
 226         }
 227
 228         if (len > 1)
 229                 kfree(msg.buf);
 230 }
 231
 232 #define sii8620_write(ctx, addr, arr...) \
 233 ({\
 234         u8 d[] = { arr }; \
 235         sii8620_write_buf(ctx, addr, d, ARRAY_SIZE(d)); \
 236 })
 237
 238 static void __sii8620_write_seq(struct sii8620 *ctx, const u16 *seq, int len)
 239 {
 240         int i;
 241
 242         for (i = 0; i < len; i += 2)
 243                 sii8620_write(ctx, seq[i], seq[i + 1]);
 244 }
 245
 246 #define sii8620_write_seq(ctx, seq...) \
 247 ({\
 248         const u16 d[] = { seq }; \
 249         __sii8620_write_seq(ctx, d, ARRAY_SIZE(d)); \
 250 })
 251
 252 #define sii8620_write_seq_static(ctx, seq...) \
 253 ({\
 254         static const u16 d[] = { seq }; \
 255         __sii8620_write_seq(ctx, d, ARRAY_SIZE(d)); \
 256 })
 257
 258 static void sii8620_setbits(struct sii8620 *ctx, u16 addr, u8 mask, u8 val)
 259 {
 260         val = (val & mask) | (sii8620_readb(ctx, addr) & ~mask);
 261         sii8620_write(ctx, addr, val);
 262 }
 263
 264 static inline bool sii8620_is_mhl3(struct sii8620 *ctx)
 265 {
 266         return ctx->mode >= CM_MHL3;
 267 }
 268
 269 static void sii8620_mt_cleanup(struct sii8620 *ctx)
 270 {
 271         struct sii8620_mt_msg *msg, *n;
 272
 273         list_for_each_entry_safe(msg, n, &ctx->mt_queue, node) {
 274                 list_del(&msg->node);
 275                 kfree(msg);
 276         }
 277         ctx->mt_state = MT_STATE_READY;
 278 }
 279
 280 static void sii8620_mt_work(struct sii8620 *ctx)
 281 {
 282         struct sii8620_mt_msg *msg;
 283
 284         if (ctx->error)
 285                 return;
 286         if (ctx->mt_state == MT_STATE_BUSY || list_empty(&ctx->mt_queue))
 287                 return;
 288
 289         if (ctx->mt_state == MT_STATE_DONE) {
 290                 ctx->mt_state = MT_STATE_READY;
 291                 msg = list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg,
 292                                        node);
 293                 list_del(&msg->node);
 294                 if (msg->recv)
 295                         msg->recv(ctx, msg);
 296                 if (msg->continuation)
 297                         msg->continuation(ctx, msg->ret);
 298                 kfree(msg);
 299         }
 300
 301         if (ctx->mt_state != MT_STATE_READY || list_empty(&ctx->mt_queue))
 302                 return;
 303
 304         ctx->mt_state = MT_STATE_BUSY;
 305         msg = list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
 306         if (msg->send)
 307                 msg->send(ctx, msg);
 308 }
 309
 310 static void sii8620_enable_gen2_write_burst(struct sii8620 *ctx)
 311 {
 312         u8 ctrl = BIT_MDT_RCV_CTRL_MDT_RCV_EN;
 313
 314         if (ctx->gen2_write_burst)
 315                 return;
 316
 317         if (ctx->mode >= CM_MHL1)
 318                 ctrl |= BIT_MDT_RCV_CTRL_MDT_DELAY_RCV_EN;
 319
 320         sii8620_write_seq(ctx,
 321                 REG_MDT_RCV_TIMEOUT, 100,
 322                 REG_MDT_RCV_CTRL, ctrl
 323         );
 324         ctx->gen2_write_burst = 1;
 325 }
 326
 327 static void sii8620_disable_gen2_write_burst(struct sii8620 *ctx)
 328 {
 329         if (!ctx->gen2_write_burst)
 330                 return;
 331
 332         sii8620_write_seq_static(ctx,
 333                 REG_MDT_XMIT_CTRL, 0,
 334                 REG_MDT_RCV_CTRL, 0
 335         );
 336         ctx->gen2_write_burst = 0;
 337 }
 338
 339 static void sii8620_start_gen2_write_burst(struct sii8620 *ctx)
 340 {
 341         sii8620_write_seq_static(ctx,
 342                 REG_MDT_INT_1_MASK, BIT_MDT_RCV_TIMEOUT
 343                         | BIT_MDT_RCV_SM_ABORT_PKT_RCVD | BIT_MDT_RCV_SM_ERROR
 344                         | BIT_MDT_XMIT_TIMEOUT | BIT_MDT_XMIT_SM_ABORT_PKT_RCVD
 345                         | BIT_MDT_XMIT_SM_ERROR,
 346                 REG_MDT_INT_0_MASK, BIT_MDT_XFIFO_EMPTY
 347                         | BIT_MDT_IDLE_AFTER_HAWB_DISABLE
 348                         | BIT_MDT_RFIFO_DATA_RDY
 349         );
 350         sii8620_enable_gen2_write_burst(ctx);
 351 }
 352
 353 static void sii8620_mt_msc_cmd_send(struct sii8620 *ctx,
 354                                     struct sii8620_mt_msg *msg)
 355 {
 356         if (msg->reg[0] == MHL_SET_INT &&
 357             msg->reg[1] == MHL_INT_REG(RCHANGE) &&
 358             msg->reg[2] == MHL_INT_RC_FEAT_REQ)
 359                 sii8620_enable_gen2_write_burst(ctx);
 360         else
 361                 sii8620_disable_gen2_write_burst(ctx);
 362
 363         switch (msg->reg[0]) {
 364         case MHL_WRITE_STAT:
 365         case MHL_SET_INT:
 366                 sii8620_write_buf(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg + 1, 2);
 367                 sii8620_write(ctx, REG_MSC_COMMAND_START,
 368                               BIT_MSC_COMMAND_START_WRITE_STAT);
 369                 break;
 370         case MHL_MSC_MSG:
 371                 sii8620_write_buf(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg, 3);
 372                 sii8620_write(ctx, REG_MSC_COMMAND_START,
 373                               BIT_MSC_COMMAND_START_MSC_MSG);
 374                 break;
 375         case MHL_READ_DEVCAP_REG:
 376         case MHL_READ_XDEVCAP_REG:
 377                 sii8620_write(ctx, REG_MSC_CMD_OR_OFFSET, msg->reg[1]);
 378                 sii8620_write(ctx, REG_MSC_COMMAND_START,
 379                               BIT_MSC_COMMAND_START_READ_DEVCAP);
 380                 break;
 381         default:
 382                 dev_err(ctx->dev, "%s: command %#x not supported\n", __func__,
 383                         msg->reg[0]);
 384         }
 385 }
 386
 387 static struct sii8620_mt_msg *sii8620_mt_msg_new(struct sii8620 *ctx)
 388 {
 389         struct sii8620_mt_msg *msg = kzalloc(sizeof(*msg), GFP_KERNEL);
 390
 391         if (!msg)
 392                 ctx->error = -ENOMEM;
 393         else
 394                 list_add_tail(&msg->node, &ctx->mt_queue);
 395
 396         return msg;
 397 }
 398
 399 static void sii8620_mt_set_cont(struct sii8620 *ctx, sii8620_cb cont)
 400 {
 401         struct sii8620_mt_msg *msg;
 402
 403         if (ctx->error)
 404                 return;
 405
 406         if (list_empty(&ctx->mt_queue)) {
 407                 ctx->error = -EINVAL;
 408                 return;
 409         }
 410         msg = list_last_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
 411         msg->continuation = cont;
 412 }
 413
 414 static void sii8620_mt_msc_cmd(struct sii8620 *ctx, u8 cmd, u8 arg1, u8 arg2)
 415 {
 416         struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
 417
 418         if (!msg)
 419                 return;
 420
 421         msg->reg[0] = cmd;
 422         msg->reg[1] = arg1;
 423         msg->reg[2] = arg2;
 424         msg->send = sii8620_mt_msc_cmd_send;
 425 }
 426
 427 static void sii8620_mt_write_stat(struct sii8620 *ctx, u8 reg, u8 val)
 428 {
 429         sii8620_mt_msc_cmd(ctx, MHL_WRITE_STAT, reg, val);
 430 }
 431
 432 static inline void sii8620_mt_set_int(struct sii8620 *ctx, u8 irq, u8 mask)
 433 {
 434         sii8620_mt_msc_cmd(ctx, MHL_SET_INT, irq, mask);
 435 }
 436
 437 static void sii8620_mt_msc_msg(struct sii8620 *ctx, u8 cmd, u8 data)
 438 {
 439         sii8620_mt_msc_cmd(ctx, MHL_MSC_MSG, cmd, data);
 440 }
 441
 442 static void sii8620_mt_rap(struct sii8620 *ctx, u8 code)
 443 {
 444         sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RAP, code);
 445 }
 446
 447 static void sii8620_mt_rcpk(struct sii8620 *ctx, u8 code)
 448 {
 449         sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPK, code);
 450 }
 451
 452 static void sii8620_mt_rcpe(struct sii8620 *ctx, u8 code)
 453 {
 454         sii8620_mt_msc_msg(ctx, MHL_MSC_MSG_RCPE, code);
 455 }
 456
 457 static void sii8620_mt_read_devcap_send(struct sii8620 *ctx,
 458                                         struct sii8620_mt_msg *msg)
 459 {
 460         u8 ctrl = BIT_EDID_CTRL_DEVCAP_SELECT_DEVCAP
 461                         | BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
 462                         | BIT_EDID_CTRL_EDID_MODE_EN;
 463
 464         if (msg->reg[0] == MHL_READ_XDEVCAP)
 465                 ctrl |= BIT_EDID_CTRL_XDEVCAP_EN;
 466
 467         sii8620_write_seq(ctx,
 468                 REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE,
 469                 REG_EDID_CTRL, ctrl,
 470                 REG_TPI_CBUS_START, BIT_TPI_CBUS_START_GET_DEVCAP_START
 471         );
 472 }
 473
 474 /* copy src to dst and set changed bits in src */
 475 static void sii8620_update_array(u8 *dst, u8 *src, int count)
 476 {
 477         while (--count >= 0) {
 478                 *src ^= *dst;
 479                 *dst++ ^= *src++;
 480         }
 481 }
 482
 483 static void sii8620_identify_sink(struct sii8620 *ctx)
 484 {
 485         static const char * const sink_str[] = {
 486                 [SINK_NONE] = "NONE",
 487                 [SINK_HDMI] = "HDMI",
 488                 [SINK_DVI] = "DVI"
 489         };
 490
 491         char sink_name[20];
 492         struct device *dev = ctx->dev;
 493
 494         if (!ctx->sink_detected || !ctx->devcap_read)
 495                 return;
 496
 497         sii8620_fetch_edid(ctx);
 498         if (!ctx->edid) {
 499                 dev_err(ctx->dev, "Cannot fetch EDID\n");
 500                 sii8620_mhl_disconnected(ctx);
 501                 return;
 502         }
 503         sii8620_set_upstream_edid(ctx);
 504
 505         if (drm_detect_hdmi_monitor(ctx->edid))
 506                 ctx->sink_type = SINK_HDMI;
 507         else
 508                 ctx->sink_type = SINK_DVI;
 509
 510         drm_edid_get_monitor_name(ctx->edid, sink_name, ARRAY_SIZE(sink_name));
 511
 512         dev_info(dev, "detected sink(type: %s): %s\n",
 513                  sink_str[ctx->sink_type], sink_name);
 514 }
 515
 516 static void sii8620_mr_devcap(struct sii8620 *ctx)
 517 {
 518         u8 dcap[MHL_DCAP_SIZE];
 519         struct device *dev = ctx->dev;
 520
 521         sii8620_read_buf(ctx, REG_EDID_FIFO_RD_DATA, dcap, MHL_DCAP_SIZE);
 522         if (ctx->error < 0)
 523                 return;
 524
 525         dev_info(dev, "detected dongle MHL %d.%d, ChipID %02x%02x:%02x%02x\n",
 526                  dcap[MHL_DCAP_MHL_VERSION] / 16,
 527                  dcap[MHL_DCAP_MHL_VERSION] % 16,
 528                  dcap[MHL_DCAP_ADOPTER_ID_H], dcap[MHL_DCAP_ADOPTER_ID_L],
 529                  dcap[MHL_DCAP_DEVICE_ID_H], dcap[MHL_DCAP_DEVICE_ID_L]);
 530         sii8620_update_array(ctx->devcap, dcap, MHL_DCAP_SIZE);
 531         ctx->devcap_read = true;
 532         sii8620_identify_sink(ctx);
 533 }
 534
 535 static void sii8620_mr_xdevcap(struct sii8620 *ctx)
 536 {
 537         sii8620_read_buf(ctx, REG_EDID_FIFO_RD_DATA, ctx->xdevcap,
 538                          MHL_XDC_SIZE);
 539 }
 540
 541 static void sii8620_mt_read_devcap_recv(struct sii8620 *ctx,
 542                                         struct sii8620_mt_msg *msg)
 543 {
 544         u8 ctrl = BIT_EDID_CTRL_DEVCAP_SELECT_DEVCAP
 545                 | BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
 546                 | BIT_EDID_CTRL_EDID_MODE_EN;
 547
 548         if (msg->reg[0] == MHL_READ_XDEVCAP)
 549                 ctrl |= BIT_EDID_CTRL_XDEVCAP_EN;
 550
 551         sii8620_write_seq(ctx,
 552                 REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE | BIT_INTR9_EDID_DONE
 553                         | BIT_INTR9_EDID_ERROR,
 554                 REG_EDID_CTRL, ctrl,
 555                 REG_EDID_FIFO_ADDR, 0
 556         );
 557
 558         if (msg->reg[0] == MHL_READ_XDEVCAP)
 559                 sii8620_mr_xdevcap(ctx);
 560         else
 561                 sii8620_mr_devcap(ctx);
 562 }
 563
 564 static void sii8620_mt_read_devcap(struct sii8620 *ctx, bool xdevcap)
 565 {
 566         struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
 567
 568         if (!msg)
 569                 return;
 570
 571         msg->reg[0] = xdevcap ? MHL_READ_XDEVCAP : MHL_READ_DEVCAP;
 572         msg->send = sii8620_mt_read_devcap_send;
 573         msg->recv = sii8620_mt_read_devcap_recv;
 574 }
 575
 576 static void sii8620_mt_read_devcap_reg_recv(struct sii8620 *ctx,
 577                 struct sii8620_mt_msg *msg)
 578 {
 579         u8 reg = msg->reg[1] & 0x7f;
 580
 581         if (msg->reg[1] & 0x80)
 582                 ctx->xdevcap[reg] = msg->ret;
 583         else
 584                 ctx->devcap[reg] = msg->ret;
 585 }
 586
 587 static void sii8620_mt_read_devcap_reg(struct sii8620 *ctx, u8 reg)
 588 {
 589         struct sii8620_mt_msg *msg = sii8620_mt_msg_new(ctx);
 590
 591         if (!msg)
 592                 return;
 593
 594         msg->reg[0] = (reg & 0x80) ? MHL_READ_XDEVCAP_REG : MHL_READ_DEVCAP_REG;
 595         msg->reg[1] = reg;
 596         msg->send = sii8620_mt_msc_cmd_send;
 597         msg->recv = sii8620_mt_read_devcap_reg_recv;
 598 }
 599
 600 static inline void sii8620_mt_read_xdevcap_reg(struct sii8620 *ctx, u8 reg)
 601 {
 602         sii8620_mt_read_devcap_reg(ctx, reg | 0x80);
 603 }
 604
 605 static void *sii8620_burst_get_tx_buf(struct sii8620 *ctx, int len)
 606 {
 607         u8 *buf = &ctx->burst.tx_buf[ctx->burst.tx_count];
 608         int size = len + 2;
 609
 610         if (ctx->burst.tx_count + size > ARRAY_SIZE(ctx->burst.tx_buf)) {
 611                 dev_err(ctx->dev, "TX-BLK buffer exhausted\n");
 612                 ctx->error = -EINVAL;
 613                 return NULL;
 614         }
 615
 616         ctx->burst.tx_count += size;
 617         buf[1] = len;
 618
 619         return buf + 2;
 620 }
 621
 622 static u8 *sii8620_burst_get_rx_buf(struct sii8620 *ctx, int len)
 623 {
 624         u8 *buf = &ctx->burst.rx_buf[ctx->burst.rx_count];
 625         int size = len + 1;
 626
 627         if (ctx->burst.tx_count + size > ARRAY_SIZE(ctx->burst.tx_buf)) {
 628                 dev_err(ctx->dev, "RX-BLK buffer exhausted\n");
 629                 ctx->error = -EINVAL;
 630                 return NULL;
 631         }
 632
 633         ctx->burst.rx_count += size;
 634         buf[0] = len;
 635
 636         return buf + 1;
 637 }
 638
 639 static void sii8620_burst_send(struct sii8620 *ctx)
 640 {
 641         int tx_left = ctx->burst.tx_count;
 642         u8 *d = ctx->burst.tx_buf;
 643
 644         while (tx_left > 0) {
 645                 int len = d[1] + 2;
 646
 647                 if (ctx->burst.r_count + len > ctx->burst.r_size)
 648                         break;
 649                 d[0] = min(ctx->burst.rx_ack, 255);
 650                 ctx->burst.rx_ack -= d[0];
 651                 sii8620_write_buf(ctx, REG_EMSC_XMIT_WRITE_PORT, d, len);
 652                 ctx->burst.r_count += len;
 653                 tx_left -= len;
 654                 d += len;
 655         }
 656
 657         ctx->burst.tx_count = tx_left;
 658
 659         while (ctx->burst.rx_ack > 0) {
 660                 u8 b[2] = { min(ctx->burst.rx_ack, 255), 0 };
 661
 662                 if (ctx->burst.r_count + 2 > ctx->burst.r_size)
 663                         break;
 664                 ctx->burst.rx_ack -= b[0];
 665                 sii8620_write_buf(ctx, REG_EMSC_XMIT_WRITE_PORT, b, 2);
 666                 ctx->burst.r_count += 2;
 667         }
 668 }
 669
 670 static void sii8620_burst_receive(struct sii8620 *ctx)
 671 {
 672         u8 buf[3], *d;
 673         int count;
 674
 675         sii8620_read_buf(ctx, REG_EMSCRFIFOBCNTL, buf, 2);
 676         count = get_unaligned_le16(buf);
 677         while (count > 0) {
 678                 int len = min(count, 3);
 679
 680                 sii8620_read_buf(ctx, REG_EMSC_RCV_READ_PORT, buf, len);
 681                 count -= len;
 682                 ctx->burst.rx_ack += len - 1;
 683                 ctx->burst.r_count -= buf[1];
 684                 if (ctx->burst.r_count < 0)
 685                         ctx->burst.r_count = 0;
 686
 687                 if (len < 3 || !buf[2])
 688                         continue;
 689
 690                 len = buf[2];
 691                 d = sii8620_burst_get_rx_buf(ctx, len);
 692                 if (!d)
 693                         continue;
 694                 sii8620_read_buf(ctx, REG_EMSC_RCV_READ_PORT, d, len);
 695                 count -= len;
 696                 ctx->burst.rx_ack += len;
 697         }
 698 }
 699
 700 static void sii8620_burst_tx_rbuf_info(struct sii8620 *ctx, int size)
 701 {
 702         struct mhl_burst_blk_rcv_buffer_info *d =
 703                 sii8620_burst_get_tx_buf(ctx, sizeof(*d));
 704         if (!d)
 705                 return;
 706
 707         d->id = cpu_to_be16(MHL_BURST_ID_BLK_RCV_BUFFER_INFO);
 708         d->size = cpu_to_le16(size);
 709 }
 710
 711 static u8 sii8620_checksum(void *ptr, int size)
 712 {
 713         u8 *d = ptr, sum = 0;
 714
 715         while (size--)
 716                 sum += *d++;
 717
 718         return sum;
 719 }
 720
 721 static void sii8620_mhl_burst_hdr_set(struct mhl3_burst_header *h,
 722         enum mhl_burst_id id)
 723 {
 724         h->id = cpu_to_be16(id);
 725         h->total_entries = 1;
 726         h->sequence_index = 1;
 727 }
 728
 729 static void sii8620_burst_tx_bits_per_pixel_fmt(struct sii8620 *ctx, u8 fmt)
 730 {
 731         struct mhl_burst_bits_per_pixel_fmt *d;
 732         const int size = sizeof(*d) + sizeof(d->desc[0]);
 733
 734         d = sii8620_burst_get_tx_buf(ctx, size);
 735         if (!d)
 736                 return;
 737
 738         sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_BITS_PER_PIXEL_FMT);
 739         d->num_entries = 1;
 740         d->desc[0].stream_id = 0;
 741         d->desc[0].pixel_format = fmt;
 742         d->hdr.checksum -= sii8620_checksum(d, size);
 743 }
 744
 745 static void sii8620_burst_rx_all(struct sii8620 *ctx)
 746 {
 747         u8 *d = ctx->burst.rx_buf;
 748         int count = ctx->burst.rx_count;
 749
 750         while (count-- > 0) {
 751                 int len = *d++;
 752                 int id = get_unaligned_be16(&d[0]);
 753
 754                 switch (id) {
 755                 case MHL_BURST_ID_BLK_RCV_BUFFER_INFO:
 756                         ctx->burst.r_size = get_unaligned_le16(&d[2]);
 757                         break;
 758                 default:
 759                         break;
 760                 }
 761                 count -= len;
 762                 d += len;
 763         }
 764         ctx->burst.rx_count = 0;
 765 }
 766
 767 static void sii8620_fetch_edid(struct sii8620 *ctx)
 768 {
 769         u8 lm_ddc, ddc_cmd, int3, cbus;
 770         unsigned long timeout;
 771         int fetched, i;
 772         int edid_len = EDID_LENGTH;
 773         u8 *edid;
 774
 775         sii8620_readb(ctx, REG_CBUS_STATUS);
 776         lm_ddc = sii8620_readb(ctx, REG_LM_DDC);
 777         ddc_cmd = sii8620_readb(ctx, REG_DDC_CMD);
 778
 779         sii8620_write_seq(ctx,
 780                 REG_INTR9_MASK, 0,
 781                 REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO,
 782                 REG_HDCP2X_POLL_CS, 0x71,
 783                 REG_HDCP2X_CTRL_0, BIT_HDCP2X_CTRL_0_HDCP2X_HDCPTX,
 784                 REG_LM_DDC, lm_ddc | BIT_LM_DDC_SW_TPI_EN_DISABLED,
 785         );
 786
 787         for (i = 0; i < 256; ++i) {
 788                 u8 ddc_stat = sii8620_readb(ctx, REG_DDC_STATUS);
 789
 790                 if (!(ddc_stat & BIT_DDC_STATUS_DDC_I2C_IN_PROG))
 791                         break;
 792                 sii8620_write(ctx, REG_DDC_STATUS,
 793                               BIT_DDC_STATUS_DDC_FIFO_EMPTY);
 794         }
 795
 796         sii8620_write(ctx, REG_DDC_ADDR, 0x50 << 1);
 797
 798         edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
 799         if (!edid) {
 800                 ctx->error = -ENOMEM;
 801                 return;
 802         }
 803
 804 #define FETCH_SIZE 16
 805         for (fetched = 0; fetched < edid_len; fetched += FETCH_SIZE) {
 806                 sii8620_readb(ctx, REG_DDC_STATUS);
 807                 sii8620_write_seq(ctx,
 808                         REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_DDC_CMD_ABORT,
 809                         REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_DDC_CMD_CLEAR_FIFO,
 810                         REG_DDC_STATUS, BIT_DDC_STATUS_DDC_FIFO_EMPTY
 811                 );
 812                 sii8620_write_seq(ctx,
 813                         REG_DDC_SEGM, fetched >> 8,
 814                         REG_DDC_OFFSET, fetched & 0xff,
 815                         REG_DDC_DIN_CNT1, FETCH_SIZE,
 816                         REG_DDC_DIN_CNT2, 0,
 817                         REG_DDC_CMD, ddc_cmd | VAL_DDC_CMD_ENH_DDC_READ_NO_ACK
 818                 );
 819
 820                 int3 = 0;
 821                 timeout = jiffies + msecs_to_jiffies(200);
 822                 for (;;) {
 823                         cbus = sii8620_readb(ctx, REG_CBUS_STATUS);
 824                         if (~cbus & BIT_CBUS_STATUS_CBUS_CONNECTED) {
 825                                 kfree(edid);
 826                                 edid = NULL;
 827                                 goto end;
 828                         }
 829                         if (int3 & BIT_DDC_CMD_DONE) {
 830                                 if (sii8620_readb(ctx, REG_DDC_DOUT_CNT)
 831                                     >= FETCH_SIZE)
 832                                         break;
 833                         } else {
 834                                 int3 = sii8620_readb(ctx, REG_INTR3);
 835                         }
 836                         if (time_is_before_jiffies(timeout)) {
 837                                 ctx->error = -ETIMEDOUT;
 838                                 dev_err(ctx->dev, "timeout during EDID read\n");
 839                                 kfree(edid);
 840                                 edid = NULL;
 841                                 goto end;
 842                         }
 843                         usleep_range(10, 20);
 844                 }
 845
 846                 sii8620_read_buf(ctx, REG_DDC_DATA, edid + fetched, FETCH_SIZE);
 847                 if (fetched + FETCH_SIZE == EDID_LENGTH) {
 848                         u8 ext = ((struct edid *)edid)->extensions;
 849
 850                         if (ext) {
 851                                 u8 *new_edid;
 852
 853                                 edid_len += ext * EDID_LENGTH;
 854                                 new_edid = krealloc(edid, edid_len, GFP_KERNEL);
 855                                 if (!new_edid) {
 856                                         kfree(edid);
 857                                         ctx->error = -ENOMEM;
 858                                         return;
 859                                 }
 860                                 edid = new_edid;
 861                         }
 862                 }
 863         }
 864
 865         sii8620_write_seq(ctx,
 866                 REG_INTR3_MASK, BIT_DDC_CMD_DONE,
 867                 REG_LM_DDC, lm_ddc
 868         );
 869
 870 end:
 871         kfree(ctx->edid);
 872         ctx->edid = (struct edid *)edid;
 873 }
 874
 875 static void sii8620_set_upstream_edid(struct sii8620 *ctx)
 876 {
 877         sii8620_setbits(ctx, REG_DPD, BIT_DPD_PDNRX12 | BIT_DPD_PDIDCK_N
 878                         | BIT_DPD_PD_MHL_CLK_N, 0xff);
 879
 880         sii8620_write_seq_static(ctx,
 881                 REG_RX_HDMI_CTRL3, 0x00,
 882                 REG_PKT_FILTER_0, 0xFF,
 883                 REG_PKT_FILTER_1, 0xFF,
 884                 REG_ALICE0_BW_I2C, 0x06
 885         );
 886
 887         sii8620_setbits(ctx, REG_RX_HDMI_CLR_BUFFER,
 888                         BIT_RX_HDMI_CLR_BUFFER_VSI_CLR_EN, 0xff);
 889
 890         sii8620_write_seq_static(ctx,
 891                 REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
 892                         | BIT_EDID_CTRL_EDID_MODE_EN,
 893                 REG_EDID_FIFO_ADDR, 0,
 894         );
 895
 896         sii8620_write_buf(ctx, REG_EDID_FIFO_WR_DATA, (u8 *)ctx->edid,
 897                           (ctx->edid->extensions + 1) * EDID_LENGTH);
 898
 899         sii8620_write_seq_static(ctx,
 900                 REG_EDID_CTRL, BIT_EDID_CTRL_EDID_PRIME_VALID
 901                         | BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO
 902                         | BIT_EDID_CTRL_EDID_MODE_EN,
 903                 REG_INTR5_MASK, BIT_INTR_SCDT_CHANGE,
 904                 REG_INTR9_MASK, 0
 905         );
 906 }
 907
 908 static void sii8620_xtal_set_rate(struct sii8620 *ctx)
 909 {
 910         static const struct {
 911                 unsigned int rate;
 912                 u8 div;
 913                 u8 tp1;
 914         } rates[] = {
 915                 { 19200, 0x04, 0x53 },
 916                 { 20000, 0x04, 0x62 },
 917                 { 24000, 0x05, 0x75 },
 918                 { 30000, 0x06, 0x92 },
 919                 { 38400, 0x0c, 0xbc },
 920         };
 921         unsigned long rate = clk_get_rate(ctx->clk_xtal) / 1000;
 922         int i;
 923
 924         for (i = 0; i < ARRAY_SIZE(rates) - 1; ++i)
 925                 if (rate <= rates[i].rate)
 926                         break;
 927
 928         if (rate != rates[i].rate)
 929                 dev_err(ctx->dev, "xtal clock rate(%lukHz) not supported, setting MHL for %ukHz.\n",
 930                         rate, rates[i].rate);
 931
 932         sii8620_write(ctx, REG_DIV_CTL_MAIN, rates[i].div);
 933         sii8620_write(ctx, REG_HDCP2X_TP1, rates[i].tp1);
 934 }
 935
 936 static int sii8620_hw_on(struct sii8620 *ctx)
 937 {
 938         int ret;
 939
 940         ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 941         if (ret)
 942                 return ret;
 943
 944         usleep_range(10000, 20000);
 945         ret = clk_prepare_enable(ctx->clk_xtal);
 946         if (ret)
 947                 return ret;
 948
 949         msleep(100);
 950         gpiod_set_value(ctx->gpio_reset, 0);
 951         msleep(100);
 952
 953         return 0;
 954 }
 955
 956 static int sii8620_hw_off(struct sii8620 *ctx)
 957 {
 958         clk_disable_unprepare(ctx->clk_xtal);
 959         gpiod_set_value(ctx->gpio_reset, 1);
 960         return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
 961 }
 962
 963 static void sii8620_cbus_reset(struct sii8620 *ctx)
 964 {
 965         sii8620_write(ctx, REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST
 966                       | BIT_PWD_SRST_CBUS_RST_SW_EN);
 967         usleep_range(10000, 20000);
 968         sii8620_write(ctx, REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST_SW_EN);
 969 }
 970
 971 static void sii8620_set_auto_zone(struct sii8620 *ctx)
 972 {
 973         if (ctx->mode != CM_MHL1) {
 974                 sii8620_write_seq_static(ctx,
 975                         REG_TX_ZONE_CTL1, 0x0,
 976                         REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
 977                                 | BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
 978                                 | BIT_MHL_PLL_CTL0_ZONE_MASK_OE
 979                 );
 980         } else {
 981                 sii8620_write_seq_static(ctx,
 982                         REG_TX_ZONE_CTL1, VAL_TX_ZONE_CTL1_TX_ZONE_CTRL_MODE,
 983                         REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
 984                                 | BIT_MHL_PLL_CTL0_ZONE_MASK_OE
 985                 );
 986         }
 987 }
 988
 989 static void sii8620_stop_video(struct sii8620 *ctx)
 990 {
 991         u8 uninitialized_var(val);
 992
 993         sii8620_write_seq_static(ctx,
 994                 REG_TPI_INTR_EN, 0,
 995                 REG_HDCP2X_INTR0_MASK, 0,
 996                 REG_TPI_COPP_DATA2, 0,
 997                 REG_TPI_INTR_ST0, ~0,
 998         );
 999
1000         switch (ctx->sink_type) {
1001         case SINK_DVI:
1002                 val = BIT_TPI_SC_REG_TMDS_OE_POWER_DOWN
1003                         | BIT_TPI_SC_TPI_AV_MUTE;
1004                 break;
1005         case SINK_HDMI:
1006         default:
1007                 val = BIT_TPI_SC_REG_TMDS_OE_POWER_DOWN
1008                         | BIT_TPI_SC_TPI_AV_MUTE
1009                         | BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI;
1010                 break;
1011         }
1012
1013         sii8620_write(ctx, REG_TPI_SC, val);
1014 }
1015
1016 static void sii8620_set_format(struct sii8620 *ctx)
1017 {
1018         if (sii8620_is_mhl3(ctx)) {
1019                 sii8620_setbits(ctx, REG_M3_P0CTRL,
1020                                 BIT_M3_P0CTRL_MHL3_P0_PIXEL_MODE_PACKED,
1021                                 ctx->use_packed_pixel ? ~0 : 0);
1022         } else {
1023                         sii8620_write_seq_static(ctx,
1024                                 REG_VID_MODE, 0,
1025                                 REG_MHL_TOP_CTL, 1,
1026                                 REG_MHLTX_CTL6, 0xa0
1027                         );
1028         }
1029
1030         sii8620_write_seq(ctx,
1031                 REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
1032                 REG_TPI_OUTPUT, VAL_TPI_FORMAT(RGB, FULL),
1033         );
1034 }
1035
1036 static int mhl3_infoframe_init(struct mhl3_infoframe *frame)
1037 {
1038         memset(frame, 0, sizeof(*frame));
1039
1040         frame->version = 3;
1041         frame->hev_format = -1;
1042         return 0;
1043 }
1044
1045 static ssize_t mhl3_infoframe_pack(struct mhl3_infoframe *frame,
1046                  void *buffer, size_t size)
1047 {
1048         const int frm_len = HDMI_INFOFRAME_HEADER_SIZE + MHL3_INFOFRAME_SIZE;
1049         u8 *ptr = buffer;
1050
1051         if (size < frm_len)
1052                 return -ENOSPC;
1053
1054         memset(buffer, 0, size);
1055         ptr[0] = HDMI_INFOFRAME_TYPE_VENDOR;
1056         ptr[1] = frame->version;
1057         ptr[2] = MHL3_INFOFRAME_SIZE;
1058         ptr[4] = MHL3_IEEE_OUI & 0xff;
1059         ptr[5] = (MHL3_IEEE_OUI >> 8) & 0xff;
1060         ptr[6] = (MHL3_IEEE_OUI >> 16) & 0xff;
1061         ptr[7] = frame->video_format & 0x3;
1062         ptr[7] |= (frame->format_type & 0x7) << 2;
1063         ptr[7] |= frame->sep_audio ? BIT(5) : 0;
1064         if (frame->hev_format >= 0) {
1065                 ptr[9] = 1;
1066                 ptr[10] = (frame->hev_format >> 8) & 0xff;
1067                 ptr[11] = frame->hev_format & 0xff;
1068         }
1069         if (frame->av_delay) {
1070                 bool sign = frame->av_delay < 0;
1071                 int delay = sign ? -frame->av_delay : frame->av_delay;
1072
1073                 ptr[12] = (delay >> 16) & 0xf;
1074                 if (sign)
1075                         ptr[12] |= BIT(4);
1076                 ptr[13] = (delay >> 8) & 0xff;
1077                 ptr[14] = delay & 0xff;
1078         }
1079         ptr[3] -= sii8620_checksum(buffer, frm_len);
1080         return frm_len;
1081 }
1082
1083 static void sii8620_set_infoframes(struct sii8620 *ctx,
1084                                    struct drm_display_mode *mode)
1085 {
1086         struct mhl3_infoframe mhl_frm;
1087         union hdmi_infoframe frm;
1088         u8 buf[31];
1089         int ret;
1090
1091         ret = drm_hdmi_avi_infoframe_from_display_mode(&frm.avi,
1092                                                        mode,
1093                                                        true);
1094         if (ctx->use_packed_pixel)
1095                 frm.avi.colorspace = HDMI_COLORSPACE_YUV422;
1096
1097         if (!ret)
1098                 ret = hdmi_avi_infoframe_pack(&frm.avi, buf, ARRAY_SIZE(buf));
1099         if (ret > 0)
1100                 sii8620_write_buf(ctx, REG_TPI_AVI_CHSUM, buf + 3, ret - 3);
1101
1102         if (!sii8620_is_mhl3(ctx) || !ctx->use_packed_pixel) {
1103                 sii8620_write(ctx, REG_TPI_SC,
1104                         BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI);
1105                 sii8620_write(ctx, REG_PKT_FILTER_0,
1106                         BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
1107                         BIT_PKT_FILTER_0_DROP_MPEG_PKT |
1108                         BIT_PKT_FILTER_0_DROP_GCP_PKT,
1109                         BIT_PKT_FILTER_1_DROP_GEN_PKT);
1110                 return;
1111         }
1112
1113         sii8620_write(ctx, REG_PKT_FILTER_0,
1114                 BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
1115                 BIT_PKT_FILTER_0_DROP_MPEG_PKT |
1116                 BIT_PKT_FILTER_0_DROP_AVI_PKT |
1117                 BIT_PKT_FILTER_0_DROP_GCP_PKT,
1118                 BIT_PKT_FILTER_1_VSI_OVERRIDE_DIS |
1119                 BIT_PKT_FILTER_1_DROP_GEN_PKT |
1120                 BIT_PKT_FILTER_1_DROP_VSIF_PKT);
1121
1122         sii8620_write(ctx, REG_TPI_INFO_FSEL, BIT_TPI_INFO_FSEL_EN
1123                 | BIT_TPI_INFO_FSEL_RPT | VAL_TPI_INFO_FSEL_VSI);
1124         ret = mhl3_infoframe_init(&mhl_frm);
1125         if (!ret)
1126                 ret = mhl3_infoframe_pack(&mhl_frm, buf, ARRAY_SIZE(buf));
1127         sii8620_write_buf(ctx, REG_TPI_INFO_B0, buf, ret);
1128 }
1129
1130 static void sii8620_start_video(struct sii8620 *ctx)
1131 {
1132         struct drm_display_mode *mode =
1133                 &ctx->bridge.encoder->crtc->state->adjusted_mode;
1134
1135         if (!sii8620_is_mhl3(ctx))
1136                 sii8620_stop_video(ctx);
1137
1138         if (ctx->sink_type == SINK_DVI && !sii8620_is_mhl3(ctx)) {
1139                 sii8620_write(ctx, REG_RX_HDMI_CTRL2,
1140                               VAL_RX_HDMI_CTRL2_DEFVAL);
1141                 sii8620_write(ctx, REG_TPI_SC, 0);
1142                 return;
1143         }
1144
1145         sii8620_write_seq_static(ctx,
1146                 REG_RX_HDMI_CTRL2, VAL_RX_HDMI_CTRL2_DEFVAL
1147                         | BIT_RX_HDMI_CTRL2_USE_AV_MUTE,
1148                 REG_VID_OVRRD, BIT_VID_OVRRD_PP_AUTO_DISABLE
1149                         | BIT_VID_OVRRD_M1080P_OVRRD);
1150         sii8620_set_format(ctx);
1151
1152         if (!sii8620_is_mhl3(ctx)) {
1153                 sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
1154                         MHL_DST_LM_CLK_MODE_NORMAL | MHL_DST_LM_PATH_ENABLED);
1155                 sii8620_set_auto_zone(ctx);
1156         } else {
1157                 static const struct {
1158                         int max_clk;
1159                         u8 zone;
1160                         u8 link_rate;
1161                         u8 rrp_decode;
1162                 } clk_spec[] = {
1163                         { 150000, VAL_TX_ZONE_CTL3_TX_ZONE_1_5GBPS,
1164                           MHL_XDS_LINK_RATE_1_5_GBPS, 0x38 },
1165                         { 300000, VAL_TX_ZONE_CTL3_TX_ZONE_3GBPS,
1166                           MHL_XDS_LINK_RATE_3_0_GBPS, 0x40 },
1167                         { 600000, VAL_TX_ZONE_CTL3_TX_ZONE_6GBPS,
1168                           MHL_XDS_LINK_RATE_6_0_GBPS, 0x40 },
1169                 };
1170                 u8 p0_ctrl = BIT_M3_P0CTRL_MHL3_P0_PORT_EN;
1171                 int clk = mode->clock * (ctx->use_packed_pixel ? 2 : 3);
1172                 int i;
1173
1174                 for (i = 0; i < ARRAY_SIZE(clk_spec) - 1; ++i)
1175                         if (clk < clk_spec[i].max_clk)
1176                                 break;
1177
1178                 if (100 * clk >= 98 * clk_spec[i].max_clk)
1179                         p0_ctrl |= BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN;
1180
1181                 sii8620_burst_tx_bits_per_pixel_fmt(ctx, ctx->use_packed_pixel);
1182                 sii8620_burst_send(ctx);
1183                 sii8620_write_seq(ctx,
1184                         REG_MHL_DP_CTL0, 0xf0,
1185                         REG_MHL3_TX_ZONE_CTL, clk_spec[i].zone);
1186                 sii8620_setbits(ctx, REG_M3_P0CTRL,
1187                         BIT_M3_P0CTRL_MHL3_P0_PORT_EN
1188                         | BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN, p0_ctrl);
1189                 sii8620_setbits(ctx, REG_M3_POSTM, MSK_M3_POSTM_RRP_DECODE,
1190                         clk_spec[i].rrp_decode);
1191                 sii8620_write_seq_static(ctx,
1192                         REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
1193                                 | BIT_M3_CTRL_H2M_SWRST,
1194                         REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
1195                 );
1196                 sii8620_mt_write_stat(ctx, MHL_XDS_REG(AVLINK_MODE_CONTROL),
1197                         clk_spec[i].link_rate);
1198         }
1199
1200         sii8620_set_infoframes(ctx, mode);
1201 }
1202
1203 static void sii8620_disable_hpd(struct sii8620 *ctx)
1204 {
1205         sii8620_setbits(ctx, REG_EDID_CTRL, BIT_EDID_CTRL_EDID_PRIME_VALID, 0);
1206         sii8620_write_seq_static(ctx,
1207                 REG_HPD_CTRL, BIT_HPD_CTRL_HPD_OUT_OVR_EN,
1208                 REG_INTR8_MASK, 0
1209         );
1210 }
1211
1212 static void sii8620_enable_hpd(struct sii8620 *ctx)
1213 {
1214         sii8620_setbits(ctx, REG_TMDS_CSTAT_P3,
1215                         BIT_TMDS_CSTAT_P3_SCDT_CLR_AVI_DIS
1216                         | BIT_TMDS_CSTAT_P3_CLR_AVI, ~0);
1217         sii8620_write_seq_static(ctx,
1218                 REG_HPD_CTRL, BIT_HPD_CTRL_HPD_OUT_OVR_EN
1219                         | BIT_HPD_CTRL_HPD_HIGH,
1220         );
1221 }
1222
1223 static void sii8620_mhl_discover(struct sii8620 *ctx)
1224 {
1225         sii8620_write_seq_static(ctx,
1226                 REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1227                         | BIT_DISC_CTRL9_DISC_PULSE_PROCEED,
1228                 REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_5K, VAL_PUP_20K),
1229                 REG_CBUS_DISC_INTR0_MASK, BIT_MHL3_EST_INT
1230                         | BIT_MHL_EST_INT
1231                         | BIT_NOT_MHL_EST_INT
1232                         | BIT_CBUS_MHL3_DISCON_INT
1233                         | BIT_CBUS_MHL12_DISCON_INT
1234                         | BIT_RGND_READY_INT,
1235                 REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
1236                         | BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
1237                         | BIT_MHL_PLL_CTL0_ZONE_MASK_OE,
1238                 REG_MHL_DP_CTL0, BIT_MHL_DP_CTL0_DP_OE
1239                         | BIT_MHL_DP_CTL0_TX_OE_OVR,
1240                 REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE,
1241                 REG_MHL_DP_CTL1, 0xA2,
1242                 REG_MHL_DP_CTL2, 0x03,
1243                 REG_MHL_DP_CTL3, 0x35,
1244                 REG_MHL_DP_CTL5, 0x02,
1245                 REG_MHL_DP_CTL6, 0x02,
1246                 REG_MHL_DP_CTL7, 0x03,
1247                 REG_COC_CTLC, 0xFF,
1248                 REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12
1249                         | BIT_DPD_OSC_EN | BIT_DPD_PWRON_HSIC,
1250                 REG_COC_INTR_MASK, BIT_COC_PLL_LOCK_STATUS_CHANGE
1251                         | BIT_COC_CALIBRATION_DONE,
1252                 REG_CBUS_INT_1_MASK, BIT_CBUS_MSC_ABORT_RCVD
1253                         | BIT_CBUS_CMD_ABORT,
1254                 REG_CBUS_INT_0_MASK, BIT_CBUS_MSC_MT_DONE
1255                         | BIT_CBUS_HPD_CHG
1256                         | BIT_CBUS_MSC_MR_WRITE_STAT
1257                         | BIT_CBUS_MSC_MR_MSC_MSG
1258                         | BIT_CBUS_MSC_MR_WRITE_BURST
1259                         | BIT_CBUS_MSC_MR_SET_INT
1260                         | BIT_CBUS_MSC_MT_DONE_NACK
1261         );
1262 }
1263
1264 static void sii8620_peer_specific_init(struct sii8620 *ctx)
1265 {
1266         if (sii8620_is_mhl3(ctx))
1267                 sii8620_write_seq_static(ctx,
1268                         REG_SYS_CTRL1, BIT_SYS_CTRL1_BLOCK_DDC_BY_HPD,
1269                         REG_EMSCINTRMASK1,
1270                                 BIT_EMSCINTR1_EMSC_TRAINING_COMMA_ERR
1271                 );
1272         else
1273                 sii8620_write_seq_static(ctx,
1274                         REG_HDCP2X_INTR0_MASK, 0x00,
1275                         REG_EMSCINTRMASK1, 0x00,
1276                         REG_HDCP2X_INTR0, 0xFF,
1277                         REG_INTR1, 0xFF,
1278                         REG_SYS_CTRL1, BIT_SYS_CTRL1_BLOCK_DDC_BY_HPD
1279                                 | BIT_SYS_CTRL1_TX_CTRL_HDMI
1280                 );
1281 }
1282
1283 #define SII8620_MHL_VERSION                     0x32
1284 #define SII8620_SCRATCHPAD_SIZE                 16
1285 #define SII8620_INT_STAT_SIZE                   0x33
1286
1287 static void sii8620_set_dev_cap(struct sii8620 *ctx)
1288 {
1289         static const u8 devcap[MHL_DCAP_SIZE] = {
1290                 [MHL_DCAP_MHL_VERSION] = SII8620_MHL_VERSION,
1291                 [MHL_DCAP_CAT] = MHL_DCAP_CAT_SOURCE | MHL_DCAP_CAT_POWER,
1292                 [MHL_DCAP_ADOPTER_ID_H] = 0x01,
1293                 [MHL_DCAP_ADOPTER_ID_L] = 0x41,
1294                 [MHL_DCAP_VID_LINK_MODE] = MHL_DCAP_VID_LINK_RGB444
1295                         | MHL_DCAP_VID_LINK_PPIXEL
1296                         | MHL_DCAP_VID_LINK_16BPP,
1297                 [MHL_DCAP_AUD_LINK_MODE] = MHL_DCAP_AUD_LINK_2CH,
1298                 [MHL_DCAP_VIDEO_TYPE] = MHL_DCAP_VT_GRAPHICS,
1299                 [MHL_DCAP_LOG_DEV_MAP] = MHL_DCAP_LD_GUI,
1300                 [MHL_DCAP_BANDWIDTH] = 0x0f,
1301                 [MHL_DCAP_FEATURE_FLAG] = MHL_DCAP_FEATURE_RCP_SUPPORT
1302                         | MHL_DCAP_FEATURE_RAP_SUPPORT
1303                         | MHL_DCAP_FEATURE_SP_SUPPORT,
1304                 [MHL_DCAP_SCRATCHPAD_SIZE] = SII8620_SCRATCHPAD_SIZE,
1305                 [MHL_DCAP_INT_STAT_SIZE] = SII8620_INT_STAT_SIZE,
1306         };
1307         static const u8 xdcap[MHL_XDC_SIZE] = {
1308                 [MHL_XDC_ECBUS_SPEEDS] = MHL_XDC_ECBUS_S_075
1309                         | MHL_XDC_ECBUS_S_8BIT,
1310                 [MHL_XDC_TMDS_SPEEDS] = MHL_XDC_TMDS_150
1311                         | MHL_XDC_TMDS_300 | MHL_XDC_TMDS_600,
1312                 [MHL_XDC_ECBUS_ROLES] = MHL_XDC_DEV_HOST,
1313                 [MHL_XDC_LOG_DEV_MAPX] = MHL_XDC_LD_PHONE,
1314         };
1315
1316         sii8620_write_buf(ctx, REG_MHL_DEVCAP_0, devcap, ARRAY_SIZE(devcap));
1317         sii8620_write_buf(ctx, REG_MHL_EXTDEVCAP_0, xdcap, ARRAY_SIZE(xdcap));
1318 }
1319
1320 static void sii8620_mhl_init(struct sii8620 *ctx)
1321 {
1322         sii8620_write_seq_static(ctx,
1323                 REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1324                 REG_CBUS_MSC_COMPAT_CTRL,
1325                         BIT_CBUS_MSC_COMPAT_CTRL_XDEVCAP_EN,
1326         );
1327
1328         sii8620_peer_specific_init(ctx);
1329
1330         sii8620_disable_hpd(ctx);
1331
1332         sii8620_write_seq_static(ctx,
1333                 REG_EDID_CTRL, BIT_EDID_CTRL_EDID_FIFO_ADDR_AUTO,
1334                 REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1335                         | BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1336                 REG_TMDS0_CCTRL1, 0x90,
1337                 REG_TMDS_CLK_EN, 0x01,
1338                 REG_TMDS_CH_EN, 0x11,
1339                 REG_BGR_BIAS, 0x87,
1340                 REG_ALICE0_ZONE_CTRL, 0xE8,
1341                 REG_ALICE0_MODE_CTRL, 0x04,
1342         );
1343         sii8620_setbits(ctx, REG_LM_DDC, BIT_LM_DDC_SW_TPI_EN_DISABLED, 0);
1344         sii8620_write_seq_static(ctx,
1345                 REG_TPI_HW_OPT3, 0x76,
1346                 REG_TMDS_CCTRL, BIT_TMDS_CCTRL_TMDS_OE,
1347                 REG_TPI_DTD_B2, 79,
1348         );
1349         sii8620_set_dev_cap(ctx);
1350         sii8620_write_seq_static(ctx,
1351                 REG_MDT_XMIT_TIMEOUT, 100,
1352                 REG_MDT_XMIT_CTRL, 0x03,
1353                 REG_MDT_XFIFO_STAT, 0x00,
1354                 REG_MDT_RCV_TIMEOUT, 100,
1355                 REG_CBUS_LINK_CTRL_8, 0x1D,
1356         );
1357
1358         sii8620_start_gen2_write_burst(ctx);
1359         sii8620_write_seq_static(ctx,
1360                 REG_BIST_CTRL, 0x00,
1361                 REG_COC_CTL1, 0x10,
1362                 REG_COC_CTL2, 0x18,
1363                 REG_COC_CTLF, 0x07,
1364                 REG_COC_CTL11, 0xF8,
1365                 REG_COC_CTL17, 0x61,
1366                 REG_COC_CTL18, 0x46,
1367                 REG_COC_CTL19, 0x15,
1368                 REG_COC_CTL1A, 0x01,
1369                 REG_MHL_COC_CTL3, BIT_MHL_COC_CTL3_COC_AECHO_EN,
1370                 REG_MHL_COC_CTL4, 0x2D,
1371                 REG_MHL_COC_CTL5, 0xF9,
1372                 REG_MSC_HEARTBEAT_CTRL, 0x27,
1373         );
1374         sii8620_disable_gen2_write_burst(ctx);
1375
1376         sii8620_mt_write_stat(ctx, MHL_DST_REG(VERSION), SII8620_MHL_VERSION);
1377         sii8620_mt_write_stat(ctx, MHL_DST_REG(CONNECTED_RDY),
1378                               MHL_DST_CONN_DCAP_RDY | MHL_DST_CONN_XDEVCAPP_SUPP
1379                               | MHL_DST_CONN_POW_STAT);
1380         sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE), MHL_INT_RC_DCAP_CHG);
1381 }
1382
1383 static void sii8620_emsc_enable(struct sii8620 *ctx)
1384 {
1385         u8 reg;
1386
1387         sii8620_setbits(ctx, REG_GENCTL, BIT_GENCTL_EMSC_EN
1388                                          | BIT_GENCTL_CLR_EMSC_RFIFO
1389                                          | BIT_GENCTL_CLR_EMSC_XFIFO, ~0);
1390         sii8620_setbits(ctx, REG_GENCTL, BIT_GENCTL_CLR_EMSC_RFIFO
1391                                          | BIT_GENCTL_CLR_EMSC_XFIFO, 0);
1392         sii8620_setbits(ctx, REG_COMMECNT, BIT_COMMECNT_I2C_TO_EMSC_EN, ~0);
1393         reg = sii8620_readb(ctx, REG_EMSCINTR);
1394         sii8620_write(ctx, REG_EMSCINTR, reg);
1395         sii8620_write(ctx, REG_EMSCINTRMASK, BIT_EMSCINTR_SPI_DVLD);
1396 }
1397
1398 static int sii8620_wait_for_fsm_state(struct sii8620 *ctx, u8 state)
1399 {
1400         int i;
1401
1402         for (i = 0; i < 10; ++i) {
1403                 u8 s = sii8620_readb(ctx, REG_COC_STAT_0);
1404
1405                 if ((s & MSK_COC_STAT_0_FSM_STATE) == state)
1406                         return 0;
1407                 if (!(s & BIT_COC_STAT_0_PLL_LOCKED))
1408                         return -EBUSY;
1409                 usleep_range(4000, 6000);
1410         }
1411         return -ETIMEDOUT;
1412 }
1413
1414 static void sii8620_set_mode(struct sii8620 *ctx, enum sii8620_mode mode)
1415 {
1416         int ret;
1417
1418         if (ctx->mode == mode)
1419                 return;
1420
1421         switch (mode) {
1422         case CM_MHL1:
1423                 sii8620_write_seq_static(ctx,
1424                         REG_CBUS_MSC_COMPAT_CTRL, 0x02,
1425                         REG_M3_CTRL, VAL_M3_CTRL_MHL1_2_VALUE,
1426                         REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12
1427                                 | BIT_DPD_OSC_EN,
1428                         REG_COC_INTR_MASK, 0
1429                 );
1430                 ctx->mode = mode;
1431                 break;
1432         case CM_MHL3:
1433                 sii8620_write(ctx, REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE);
1434                 ctx->mode = mode;
1435                 return;
1436         case CM_ECBUS_S:
1437                 sii8620_emsc_enable(ctx);
1438                 sii8620_write_seq_static(ctx,
1439                         REG_TTXSPINUMS, 4,
1440                         REG_TRXSPINUMS, 4,
1441                         REG_TTXHSICNUMS, 0x14,
1442                         REG_TRXHSICNUMS, 0x14,
1443                         REG_TTXTOTNUMS, 0x18,
1444                         REG_TRXTOTNUMS, 0x18,
1445                         REG_PWD_SRST, BIT_PWD_SRST_COC_DOC_RST
1446                                       | BIT_PWD_SRST_CBUS_RST_SW_EN,
1447                         REG_MHL_COC_CTL1, 0xbd,
1448                         REG_PWD_SRST, BIT_PWD_SRST_CBUS_RST_SW_EN,
1449                         REG_COC_CTLB, 0x01,
1450                         REG_COC_CTL0, 0x5c,
1451                         REG_COC_CTL14, 0x03,
1452                         REG_COC_CTL15, 0x80,
1453                         REG_MHL_DP_CTL6, BIT_MHL_DP_CTL6_DP_TAP1_SGN
1454                                          | BIT_MHL_DP_CTL6_DP_TAP1_EN
1455                                          | BIT_MHL_DP_CTL6_DT_PREDRV_FEEDCAP_EN,
1456                         REG_MHL_DP_CTL8, 0x03
1457                 );
1458                 ret = sii8620_wait_for_fsm_state(ctx, 0x03);
1459                 sii8620_write_seq_static(ctx,
1460                         REG_COC_CTL14, 0x00,
1461                         REG_COC_CTL15, 0x80
1462                 );
1463                 if (!ret)
1464                         sii8620_write(ctx, REG_CBUS3_CNVT, 0x85);
1465                 else
1466                         sii8620_disconnect(ctx);
1467                 return;
1468         case CM_DISCONNECTED:
1469                 ctx->mode = mode;
1470                 break;
1471         default:
1472                 dev_err(ctx->dev, "%s mode %d not supported\n", __func__, mode);
1473                 break;
1474         }
1475
1476         sii8620_set_auto_zone(ctx);
1477
1478         if (mode != CM_MHL1)
1479                 return;
1480
1481         sii8620_write_seq_static(ctx,
1482                 REG_MHL_DP_CTL0, 0xBC,
1483                 REG_MHL_DP_CTL1, 0xBB,
1484                 REG_MHL_DP_CTL3, 0x48,
1485                 REG_MHL_DP_CTL5, 0x39,
1486                 REG_MHL_DP_CTL2, 0x2A,
1487                 REG_MHL_DP_CTL6, 0x2A,
1488                 REG_MHL_DP_CTL7, 0x08
1489         );
1490 }
1491
1492 static void sii8620_hpd_unplugged(struct sii8620 *ctx)
1493 {
1494         sii8620_disable_hpd(ctx);
1495         ctx->sink_type = SINK_NONE;
1496         ctx->sink_detected = false;
1497         ctx->feature_complete = false;
1498         kfree(ctx->edid);
1499         ctx->edid = NULL;
1500 }
1501
1502 static void sii8620_disconnect(struct sii8620 *ctx)
1503 {
1504         sii8620_disable_gen2_write_burst(ctx);
1505         sii8620_stop_video(ctx);
1506         msleep(100);
1507         sii8620_cbus_reset(ctx);
1508         sii8620_set_mode(ctx, CM_DISCONNECTED);
1509         sii8620_write_seq_static(ctx,
1510                 REG_TX_ZONE_CTL1, 0,
1511                 REG_MHL_PLL_CTL0, 0x07,
1512                 REG_COC_CTL0, 0x40,
1513                 REG_CBUS3_CNVT, 0x84,
1514                 REG_COC_CTL14, 0x00,
1515                 REG_COC_CTL0, 0x40,
1516                 REG_HRXCTRL3, 0x07,
1517                 REG_MHL_PLL_CTL0, VAL_MHL_PLL_CTL0_HDMI_CLK_RATIO_1X
1518                         | BIT_MHL_PLL_CTL0_CRYSTAL_CLK_SEL
1519                         | BIT_MHL_PLL_CTL0_ZONE_MASK_OE,
1520                 REG_MHL_DP_CTL0, BIT_MHL_DP_CTL0_DP_OE
1521                         | BIT_MHL_DP_CTL0_TX_OE_OVR,
1522                 REG_MHL_DP_CTL1, 0xBB,
1523                 REG_MHL_DP_CTL3, 0x48,
1524                 REG_MHL_DP_CTL5, 0x3F,
1525                 REG_MHL_DP_CTL2, 0x2F,
1526                 REG_MHL_DP_CTL6, 0x2A,
1527                 REG_MHL_DP_CTL7, 0x03
1528         );
1529         sii8620_hpd_unplugged(ctx);
1530         sii8620_write_seq_static(ctx,
1531                 REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE,
1532                 REG_MHL_COC_CTL1, 0x07,
1533                 REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1534                 REG_DISC_CTRL8, 0x00,
1535                 REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1536                         | BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1537                 REG_INT_CTRL, 0x00,
1538                 REG_MSC_HEARTBEAT_CTRL, 0x27,
1539                 REG_DISC_CTRL1, 0x25,
1540                 REG_CBUS_DISC_INTR0, (u8)~BIT_RGND_READY_INT,
1541                 REG_CBUS_DISC_INTR0_MASK, BIT_RGND_READY_INT,
1542                 REG_MDT_INT_1, 0xff,
1543                 REG_MDT_INT_1_MASK, 0x00,
1544                 REG_MDT_INT_0, 0xff,
1545                 REG_MDT_INT_0_MASK, 0x00,
1546                 REG_COC_INTR, 0xff,
1547                 REG_COC_INTR_MASK, 0x00,
1548                 REG_TRXINTH, 0xff,
1549                 REG_TRXINTMH, 0x00,
1550                 REG_CBUS_INT_0, 0xff,
1551                 REG_CBUS_INT_0_MASK, 0x00,
1552                 REG_CBUS_INT_1, 0xff,
1553                 REG_CBUS_INT_1_MASK, 0x00,
1554                 REG_EMSCINTR, 0xff,
1555                 REG_EMSCINTRMASK, 0x00,
1556                 REG_EMSCINTR1, 0xff,
1557                 REG_EMSCINTRMASK1, 0x00,
1558                 REG_INTR8, 0xff,
1559                 REG_INTR8_MASK, 0x00,
1560                 REG_TPI_INTR_ST0, 0xff,
1561                 REG_TPI_INTR_EN, 0x00,
1562                 REG_HDCP2X_INTR0, 0xff,
1563                 REG_HDCP2X_INTR0_MASK, 0x00,
1564                 REG_INTR9, 0xff,
1565                 REG_INTR9_MASK, 0x00,
1566                 REG_INTR3, 0xff,
1567                 REG_INTR3_MASK, 0x00,
1568                 REG_INTR5, 0xff,
1569                 REG_INTR5_MASK, 0x00,
1570                 REG_INTR2, 0xff,
1571                 REG_INTR2_MASK, 0x00,
1572         );
1573         memset(ctx->stat, 0, sizeof(ctx->stat));
1574         memset(ctx->xstat, 0, sizeof(ctx->xstat));
1575         memset(ctx->devcap, 0, sizeof(ctx->devcap));
1576         memset(ctx->xdevcap, 0, sizeof(ctx->xdevcap));
1577         ctx->devcap_read = false;
1578         ctx->cbus_status = 0;
1579         sii8620_mt_cleanup(ctx);
1580 }
1581
1582 static void sii8620_mhl_disconnected(struct sii8620 *ctx)
1583 {
1584         sii8620_write_seq_static(ctx,
1585                 REG_DISC_CTRL4, VAL_DISC_CTRL4(VAL_PUP_OFF, VAL_PUP_20K),
1586                 REG_CBUS_MSC_COMPAT_CTRL,
1587                         BIT_CBUS_MSC_COMPAT_CTRL_XDEVCAP_EN
1588         );
1589         sii8620_disconnect(ctx);
1590 }
1591
1592 static void sii8620_irq_disc(struct sii8620 *ctx)
1593 {
1594         u8 stat = sii8620_readb(ctx, REG_CBUS_DISC_INTR0);
1595
1596         if (stat & VAL_CBUS_MHL_DISCON)
1597                 sii8620_mhl_disconnected(ctx);
1598
1599         if (stat & BIT_RGND_READY_INT) {
1600                 u8 stat2 = sii8620_readb(ctx, REG_DISC_STAT2);
1601
1602                 if ((stat2 & MSK_DISC_STAT2_RGND) == VAL_RGND_1K) {
1603                         sii8620_mhl_discover(ctx);
1604                 } else {
1605                         sii8620_write_seq_static(ctx,
1606                                 REG_DISC_CTRL9, BIT_DISC_CTRL9_WAKE_DRVFLT
1607                                         | BIT_DISC_CTRL9_NOMHL_EST
1608                                         | BIT_DISC_CTRL9_WAKE_PULSE_BYPASS,
1609                                 REG_CBUS_DISC_INTR0_MASK, BIT_RGND_READY_INT
1610                                         | BIT_CBUS_MHL3_DISCON_INT
1611                                         | BIT_CBUS_MHL12_DISCON_INT
1612                                         | BIT_NOT_MHL_EST_INT
1613                         );
1614                 }
1615         }
1616         if (stat & BIT_MHL_EST_INT)
1617                 sii8620_mhl_init(ctx);
1618
1619         sii8620_write(ctx, REG_CBUS_DISC_INTR0, stat);
1620 }
1621
1622 static void sii8620_read_burst(struct sii8620 *ctx)
1623 {
1624         u8 buf[17];
1625
1626         sii8620_read_buf(ctx, REG_MDT_RCV_READ_PORT, buf, ARRAY_SIZE(buf));
1627         sii8620_write(ctx, REG_MDT_RCV_CTRL, BIT_MDT_RCV_CTRL_MDT_RCV_EN |
1628                       BIT_MDT_RCV_CTRL_MDT_DELAY_RCV_EN |
1629                       BIT_MDT_RCV_CTRL_MDT_RFIFO_CLR_CUR);
1630         sii8620_readb(ctx, REG_MDT_RFIFO_STAT);
1631 }
1632
1633 static void sii8620_irq_g2wb(struct sii8620 *ctx)
1634 {
1635         u8 stat = sii8620_readb(ctx, REG_MDT_INT_0);
1636
1637         if (stat & BIT_MDT_IDLE_AFTER_HAWB_DISABLE)
1638                 if (sii8620_is_mhl3(ctx))
1639                         sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
1640                                 MHL_INT_RC_FEAT_COMPLETE);
1641
1642         if (stat & BIT_MDT_RFIFO_DATA_RDY)
1643                 sii8620_read_burst(ctx);
1644
1645         if (stat & BIT_MDT_XFIFO_EMPTY)
1646                 sii8620_write(ctx, REG_MDT_XMIT_CTRL, 0);
1647
1648         sii8620_write(ctx, REG_MDT_INT_0, stat);
1649 }
1650
1651 static void sii8620_status_dcap_ready(struct sii8620 *ctx)
1652 {
1653         enum sii8620_mode mode;
1654
1655         mode = ctx->stat[MHL_DST_VERSION] >= 0x30 ? CM_MHL3 : CM_MHL1;
1656         if (mode > ctx->mode)
1657                 sii8620_set_mode(ctx, mode);
1658         sii8620_peer_specific_init(ctx);
1659         sii8620_write(ctx, REG_INTR9_MASK, BIT_INTR9_DEVCAP_DONE
1660                       | BIT_INTR9_EDID_DONE | BIT_INTR9_EDID_ERROR);
1661 }
1662
1663 static void sii8620_status_changed_path(struct sii8620 *ctx)
1664 {
1665         if (ctx->stat[MHL_DST_LINK_MODE] & MHL_DST_LM_PATH_ENABLED) {
1666                 sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
1667                                       MHL_DST_LM_CLK_MODE_NORMAL
1668                                       | MHL_DST_LM_PATH_ENABLED);
1669         } else {
1670                 sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
1671                                       MHL_DST_LM_CLK_MODE_NORMAL);
1672         }
1673 }
1674
1675 static void sii8620_msc_mr_write_stat(struct sii8620 *ctx)
1676 {
1677         u8 st[MHL_DST_SIZE], xst[MHL_XDS_SIZE];
1678
1679         sii8620_read_buf(ctx, REG_MHL_STAT_0, st, MHL_DST_SIZE);
1680         sii8620_read_buf(ctx, REG_MHL_EXTSTAT_0, xst, MHL_XDS_SIZE);
1681
1682         sii8620_update_array(ctx->stat, st, MHL_DST_SIZE);
1683         sii8620_update_array(ctx->xstat, xst, MHL_XDS_SIZE);
1684
1685         if (ctx->stat[MHL_DST_CONNECTED_RDY] & st[MHL_DST_CONNECTED_RDY] &
1686             MHL_DST_CONN_DCAP_RDY) {
1687                 sii8620_status_dcap_ready(ctx);
1688
1689                 if (!sii8620_is_mhl3(ctx))
1690                         sii8620_mt_read_devcap(ctx, false);
1691         }
1692
1693         if (st[MHL_DST_LINK_MODE] & MHL_DST_LM_PATH_ENABLED)
1694                 sii8620_status_changed_path(ctx);
1695 }
1696
1697 static void sii8620_ecbus_up(struct sii8620 *ctx, int ret)
1698 {
1699         if (ret < 0)
1700                 return;
1701
1702         sii8620_set_mode(ctx, CM_ECBUS_S);
1703 }
1704
1705 static void sii8620_got_ecbus_speed(struct sii8620 *ctx, int ret)
1706 {
1707         if (ret < 0)
1708                 return;
1709
1710         sii8620_mt_write_stat(ctx, MHL_XDS_REG(CURR_ECBUS_MODE),
1711                               MHL_XDS_ECBUS_S | MHL_XDS_SLOT_MODE_8BIT);
1712         sii8620_mt_rap(ctx, MHL_RAP_CBUS_MODE_UP);
1713         sii8620_mt_set_cont(ctx, sii8620_ecbus_up);
1714 }
1715
1716 static void sii8620_mhl_burst_emsc_support_set(struct mhl_burst_emsc_support *d,
1717         enum mhl_burst_id id)
1718 {
1719         sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_EMSC_SUPPORT);
1720         d->num_entries = 1;
1721         d->burst_id[0] = cpu_to_be16(id);
1722 }
1723
1724 static void sii8620_send_features(struct sii8620 *ctx)
1725 {
1726         u8 buf[16];
1727
1728         sii8620_write(ctx, REG_MDT_XMIT_CTRL, BIT_MDT_XMIT_CTRL_EN
1729                 | BIT_MDT_XMIT_CTRL_FIXED_BURST_LEN);
1730         sii8620_mhl_burst_emsc_support_set((void *)buf,
1731                 MHL_BURST_ID_HID_PAYLOAD);
1732         sii8620_write_buf(ctx, REG_MDT_XMIT_WRITE_PORT, buf, ARRAY_SIZE(buf));
1733 }
1734
1735 static bool sii8620_rcp_consume(struct sii8620 *ctx, u8 scancode)
1736 {
1737         bool pressed = !(scancode & MHL_RCP_KEY_RELEASED_MASK);
1738
1739         scancode &= MHL_RCP_KEY_ID_MASK;
1740
1741         if (!ctx->rc_dev) {
1742                 dev_dbg(ctx->dev, "RCP input device not initialized\n");
1743                 return false;
1744         }
1745
1746         if (pressed)
1747                 rc_keydown(ctx->rc_dev, RC_PROTO_CEC, scancode, 0);
1748         else
1749                 rc_keyup(ctx->rc_dev);
1750
1751         return true;
1752 }
1753
1754 static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
1755 {
1756         u8 ints[MHL_INT_SIZE];
1757
1758         sii8620_read_buf(ctx, REG_MHL_INT_0, ints, MHL_INT_SIZE);
1759         sii8620_write_buf(ctx, REG_MHL_INT_0, ints, MHL_INT_SIZE);
1760
1761         if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_DCAP_CHG) {
1762                 switch (ctx->mode) {
1763                 case CM_MHL3:
1764                         sii8620_mt_read_xdevcap_reg(ctx, MHL_XDC_ECBUS_SPEEDS);
1765                         sii8620_mt_set_cont(ctx, sii8620_got_ecbus_speed);
1766                         break;
1767                 case CM_ECBUS_S:
1768                         sii8620_mt_read_devcap(ctx, true);
1769                         break;
1770                 default:
1771                         break;
1772                 }
1773         }
1774         if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_REQ)
1775                 sii8620_send_features(ctx);
1776         if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_COMPLETE) {
1777                 ctx->feature_complete = true;
1778                 if (ctx->edid)
1779                         sii8620_enable_hpd(ctx);
1780         }
1781 }
1782
1783 static struct sii8620_mt_msg *sii8620_msc_msg_first(struct sii8620 *ctx)
1784 {
1785         struct device *dev = ctx->dev;
1786
1787         if (list_empty(&ctx->mt_queue)) {
1788                 dev_err(dev, "unexpected MSC MT response\n");
1789                 return NULL;
1790         }
1791
1792         return list_first_entry(&ctx->mt_queue, struct sii8620_mt_msg, node);
1793 }
1794
1795 static void sii8620_msc_mt_done(struct sii8620 *ctx)
1796 {
1797         struct sii8620_mt_msg *msg = sii8620_msc_msg_first(ctx);
1798
1799         if (!msg)
1800                 return;
1801
1802         msg->ret = sii8620_readb(ctx, REG_MSC_MT_RCVD_DATA0);
1803         ctx->mt_state = MT_STATE_DONE;
1804 }
1805
1806 static void sii8620_msc_mr_msc_msg(struct sii8620 *ctx)
1807 {
1808         struct sii8620_mt_msg *msg;
1809         u8 buf[2];
1810
1811         sii8620_read_buf(ctx, REG_MSC_MR_MSC_MSG_RCVD_1ST_DATA, buf, 2);
1812
1813         switch (buf[0]) {
1814         case MHL_MSC_MSG_RAPK:
1815                 msg = sii8620_msc_msg_first(ctx);
1816                 if (!msg)
1817                         return;
1818                 msg->ret = buf[1];
1819                 ctx->mt_state = MT_STATE_DONE;
1820                 break;
1821         case MHL_MSC_MSG_RCP:
1822                 if (!sii8620_rcp_consume(ctx, buf[1]))
1823                         sii8620_mt_rcpe(ctx,
1824                                         MHL_RCPE_STATUS_INEFFECTIVE_KEY_CODE);
1825                 sii8620_mt_rcpk(ctx, buf[1]);
1826                 break;
1827         default:
1828                 dev_err(ctx->dev, "%s message type %d,%d not supported",
1829                         __func__, buf[0], buf[1]);
1830         }
1831 }
1832
1833 static void sii8620_irq_msc(struct sii8620 *ctx)
1834 {
1835         u8 stat = sii8620_readb(ctx, REG_CBUS_INT_0);
1836
1837         if (stat & ~BIT_CBUS_HPD_CHG)
1838                 sii8620_write(ctx, REG_CBUS_INT_0, stat & ~BIT_CBUS_HPD_CHG);
1839
1840         if (stat & BIT_CBUS_HPD_CHG) {
1841                 u8 cbus_stat = sii8620_readb(ctx, REG_CBUS_STATUS);
1842
1843                 if ((cbus_stat ^ ctx->cbus_status) & BIT_CBUS_STATUS_CBUS_HPD) {
1844                         sii8620_write(ctx, REG_CBUS_INT_0, BIT_CBUS_HPD_CHG);
1845                 } else {
1846                         stat ^= BIT_CBUS_STATUS_CBUS_HPD;
1847                         cbus_stat ^= BIT_CBUS_STATUS_CBUS_HPD;
1848                 }
1849                 ctx->cbus_status = cbus_stat;
1850         }
1851
1852         if (stat & BIT_CBUS_MSC_MR_WRITE_STAT)
1853                 sii8620_msc_mr_write_stat(ctx);
1854
1855         if (stat & BIT_CBUS_HPD_CHG) {
1856                 if (ctx->cbus_status & BIT_CBUS_STATUS_CBUS_HPD) {
1857                         ctx->sink_detected = true;
1858                         sii8620_identify_sink(ctx);
1859                 } else {
1860                         sii8620_hpd_unplugged(ctx);
1861                 }
1862         }
1863
1864         if (stat & BIT_CBUS_MSC_MR_SET_INT)
1865                 sii8620_msc_mr_set_int(ctx);
1866
1867         if (stat & BIT_CBUS_MSC_MT_DONE)
1868                 sii8620_msc_mt_done(ctx);
1869
1870         if (stat & BIT_CBUS_MSC_MR_MSC_MSG)
1871                 sii8620_msc_mr_msc_msg(ctx);
1872 }
1873
1874 static void sii8620_irq_coc(struct sii8620 *ctx)
1875 {
1876         u8 stat = sii8620_readb(ctx, REG_COC_INTR);
1877
1878         if (stat & BIT_COC_CALIBRATION_DONE) {
1879                 u8 cstat = sii8620_readb(ctx, REG_COC_STAT_0);
1880
1881                 cstat &= BIT_COC_STAT_0_PLL_LOCKED | MSK_COC_STAT_0_FSM_STATE;
1882                 if (cstat == (BIT_COC_STAT_0_PLL_LOCKED | 0x02)) {
1883                         sii8620_write_seq_static(ctx,
1884                                 REG_COC_CTLB, 0,
1885                                 REG_TRXINTMH, BIT_TDM_INTR_SYNC_DATA
1886                                               | BIT_TDM_INTR_SYNC_WAIT
1887                         );
1888                 }
1889         }
1890
1891         sii8620_write(ctx, REG_COC_INTR, stat);
1892 }
1893
1894 static void sii8620_irq_merr(struct sii8620 *ctx)
1895 {
1896         u8 stat = sii8620_readb(ctx, REG_CBUS_INT_1);
1897
1898         sii8620_write(ctx, REG_CBUS_INT_1, stat);
1899 }
1900
1901 static void sii8620_irq_edid(struct sii8620 *ctx)
1902 {
1903         u8 stat = sii8620_readb(ctx, REG_INTR9);
1904
1905         sii8620_write(ctx, REG_INTR9, stat);
1906
1907         if (stat & BIT_INTR9_DEVCAP_DONE)
1908                 ctx->mt_state = MT_STATE_DONE;
1909 }
1910
1911 static void sii8620_irq_scdt(struct sii8620 *ctx)
1912 {
1913         u8 stat = sii8620_readb(ctx, REG_INTR5);
1914
1915         if (stat & BIT_INTR_SCDT_CHANGE) {
1916                 u8 cstat = sii8620_readb(ctx, REG_TMDS_CSTAT_P3);
1917
1918                 if (cstat & BIT_TMDS_CSTAT_P3_SCDT)
1919                         sii8620_start_video(ctx);
1920         }
1921
1922         sii8620_write(ctx, REG_INTR5, stat);
1923 }
1924
1925 static void sii8620_got_xdevcap(struct sii8620 *ctx, int ret)
1926 {
1927         if (ret < 0)
1928                 return;
1929
1930         sii8620_mt_read_devcap(ctx, false);
1931 }
1932
1933 static void sii8620_irq_tdm(struct sii8620 *ctx)
1934 {
1935         u8 stat = sii8620_readb(ctx, REG_TRXINTH);
1936         u8 tdm = sii8620_readb(ctx, REG_TRXSTA2);
1937
1938         if ((tdm & MSK_TDM_SYNCHRONIZED) == VAL_TDM_SYNCHRONIZED) {
1939                 ctx->mode = CM_ECBUS_S;
1940                 ctx->burst.rx_ack = 0;
1941                 ctx->burst.r_size = SII8620_BURST_BUF_LEN;
1942                 sii8620_burst_tx_rbuf_info(ctx, SII8620_BURST_BUF_LEN);
1943                 sii8620_mt_read_devcap(ctx, true);
1944                 sii8620_mt_set_cont(ctx, sii8620_got_xdevcap);
1945         } else {
1946                 sii8620_write_seq_static(ctx,
1947                         REG_MHL_PLL_CTL2, 0,
1948                         REG_MHL_PLL_CTL2, BIT_MHL_PLL_CTL2_CLKDETECT_EN
1949                 );
1950         }
1951
1952         sii8620_write(ctx, REG_TRXINTH, stat);
1953 }
1954
1955 static void sii8620_irq_block(struct sii8620 *ctx)
1956 {
1957         u8 stat = sii8620_readb(ctx, REG_EMSCINTR);
1958
1959         if (stat & BIT_EMSCINTR_SPI_DVLD) {
1960                 u8 bstat = sii8620_readb(ctx, REG_SPIBURSTSTAT);
1961
1962                 if (bstat & BIT_SPIBURSTSTAT_EMSC_NORMAL_MODE)
1963                         sii8620_burst_receive(ctx);
1964         }
1965
1966         sii8620_write(ctx, REG_EMSCINTR, stat);
1967 }
1968
1969 static void sii8620_irq_ddc(struct sii8620 *ctx)
1970 {
1971         u8 stat = sii8620_readb(ctx, REG_INTR3);
1972
1973         if (stat & BIT_DDC_CMD_DONE) {
1974                 sii8620_write(ctx, REG_INTR3_MASK, 0);
1975                 if (sii8620_is_mhl3(ctx) && !ctx->feature_complete)
1976                         sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
1977                                            MHL_INT_RC_FEAT_REQ);
1978                 else
1979                         sii8620_enable_hpd(ctx);
1980         }
1981         sii8620_write(ctx, REG_INTR3, stat);
1982 }
1983
1984 /* endian agnostic, non-volatile version of test_bit */
1985 static bool sii8620_test_bit(unsigned int nr, const u8 *addr)
1986 {
1987         return 1 & (addr[nr / BITS_PER_BYTE] >> (nr % BITS_PER_BYTE));
1988 }
1989
1990 static irqreturn_t sii8620_irq_thread(int irq, void *data)
1991 {
1992         static const struct {
1993                 int bit;
1994                 void (*handler)(struct sii8620 *ctx);
1995         } irq_vec[] = {
1996                 { BIT_FAST_INTR_STAT_DISC, sii8620_irq_disc },
1997                 { BIT_FAST_INTR_STAT_G2WB, sii8620_irq_g2wb },
1998                 { BIT_FAST_INTR_STAT_COC, sii8620_irq_coc },
1999                 { BIT_FAST_INTR_STAT_TDM, sii8620_irq_tdm },
2000                 { BIT_FAST_INTR_STAT_MSC, sii8620_irq_msc },
2001                 { BIT_FAST_INTR_STAT_MERR, sii8620_irq_merr },
2002                 { BIT_FAST_INTR_STAT_BLOCK, sii8620_irq_block },
2003                 { BIT_FAST_INTR_STAT_EDID, sii8620_irq_edid },
2004                 { BIT_FAST_INTR_STAT_DDC, sii8620_irq_ddc },
2005                 { BIT_FAST_INTR_STAT_SCDT, sii8620_irq_scdt },
2006         };
2007         struct sii8620 *ctx = data;
2008         u8 stats[LEN_FAST_INTR_STAT];
2009         int i, ret;
2010
2011         mutex_lock(&ctx->lock);
2012
2013         sii8620_read_buf(ctx, REG_FAST_INTR_STAT, stats, ARRAY_SIZE(stats));
2014         for (i = 0; i < ARRAY_SIZE(irq_vec); ++i)
2015                 if (sii8620_test_bit(irq_vec[i].bit, stats))
2016                         irq_vec[i].handler(ctx);
2017
2018         sii8620_burst_rx_all(ctx);
2019         sii8620_mt_work(ctx);
2020         sii8620_burst_send(ctx);
2021
2022         ret = sii8620_clear_error(ctx);
2023         if (ret) {
2024                 dev_err(ctx->dev, "Error during IRQ handling, %d.\n", ret);
2025                 sii8620_mhl_disconnected(ctx);
2026         }
2027         mutex_unlock(&ctx->lock);
2028
2029         return IRQ_HANDLED;
2030 }
2031
2032 static void sii8620_cable_in(struct sii8620 *ctx)
2033 {
2034         struct device *dev = ctx->dev;
2035         u8 ver[5];
2036         int ret;
2037
2038         ret = sii8620_hw_on(ctx);
2039         if (ret) {
2040                 dev_err(dev, "Error powering on, %d.\n", ret);
2041                 return;
2042         }
2043
2044         sii8620_read_buf(ctx, REG_VND_IDL, ver, ARRAY_SIZE(ver));
2045         ret = sii8620_clear_error(ctx);
2046         if (ret) {
2047                 dev_err(dev, "Error accessing I2C bus, %d.\n", ret);
2048                 return;
2049         }
2050
2051         dev_info(dev, "ChipID %02x%02x:%02x%02x rev %02x.\n", ver[1], ver[0],
2052                  ver[3], ver[2], ver[4]);
2053
2054         sii8620_write(ctx, REG_DPD,
2055                       BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12 | BIT_DPD_OSC_EN);
2056
2057         sii8620_xtal_set_rate(ctx);
2058         sii8620_disconnect(ctx);
2059
2060         sii8620_write_seq_static(ctx,
2061                 REG_MHL_CBUS_CTL0, VAL_MHL_CBUS_CTL0_CBUS_DRV_SEL_STRONG
2062                         | VAL_MHL_CBUS_CTL0_CBUS_RGND_VBIAS_734,
2063                 REG_MHL_CBUS_CTL1, VAL_MHL_CBUS_CTL1_1115_OHM,
2064                 REG_DPD, BIT_DPD_PWRON_PLL | BIT_DPD_PDNTX12 | BIT_DPD_OSC_EN,
2065         );
2066
2067         ret = sii8620_clear_error(ctx);
2068         if (ret) {
2069                 dev_err(dev, "Error accessing I2C bus, %d.\n", ret);
2070                 return;
2071         }
2072
2073         enable_irq(to_i2c_client(ctx->dev)->irq);
2074 }
2075
2076 static void sii8620_init_rcp_input_dev(struct sii8620 *ctx)
2077 {
2078         struct rc_dev *rc_dev;
2079         int ret;
2080
2081         rc_dev = rc_allocate_device(RC_DRIVER_SCANCODE);
2082         if (!rc_dev) {
2083                 dev_err(ctx->dev, "Failed to allocate RC device\n");
2084                 ctx->error = -ENOMEM;
2085                 return;
2086         }
2087
2088         rc_dev->input_phys = "sii8620/input0";
2089         rc_dev->input_id.bustype = BUS_VIRTUAL;
2090         rc_dev->map_name = RC_MAP_CEC;
2091         rc_dev->allowed_protocols = RC_PROTO_BIT_CEC;
2092         rc_dev->driver_name = "sii8620";
2093         rc_dev->device_name = "sii8620";
2094
2095         ret = rc_register_device(rc_dev);
2096
2097         if (ret) {
2098                 dev_err(ctx->dev, "Failed to register RC device\n");
2099                 ctx->error = ret;
2100                 rc_free_device(ctx->rc_dev);
2101                 return;
2102         }
2103         ctx->rc_dev = rc_dev;
2104 }
2105
2106 static void sii8620_cable_out(struct sii8620 *ctx)
2107 {
2108         disable_irq(to_i2c_client(ctx->dev)->irq);
2109         sii8620_hw_off(ctx);
2110 }
2111
2112 static void sii8620_extcon_work(struct work_struct *work)
2113 {
2114         struct sii8620 *ctx =
2115                 container_of(work, struct sii8620, extcon_wq);
2116         int state = extcon_get_state(ctx->extcon, EXTCON_DISP_MHL);
2117
2118         if (state == ctx->cable_state)
2119                 return;
2120
2121         ctx->cable_state = state;
2122
2123         if (state > 0)
2124                 sii8620_cable_in(ctx);
2125         else
2126                 sii8620_cable_out(ctx);
2127 }
2128
2129 static int sii8620_extcon_notifier(struct notifier_block *self,
2130                         unsigned long event, void *ptr)
2131 {
2132         struct sii8620 *ctx =
2133                 container_of(self, struct sii8620, extcon_nb);
2134
2135         schedule_work(&ctx->extcon_wq);
2136
2137         return NOTIFY_DONE;
2138 }
2139
2140 static int sii8620_extcon_init(struct sii8620 *ctx)
2141 {
2142         struct extcon_dev *edev;
2143         struct device_node *musb, *muic;
2144         int ret;
2145
2146         /* get micro-USB connector node */
2147         musb = of_graph_get_remote_node(ctx->dev->of_node, 1, -1);
2148         /* next get micro-USB Interface Controller node */
2149         muic = of_get_next_parent(musb);
2150
2151         if (!muic) {
2152                 dev_info(ctx->dev, "no extcon found, switching to 'always on' mode\n");
2153                 return 0;
2154         }
2155
2156         edev = extcon_find_edev_by_node(muic);
2157         of_node_put(muic);
2158         if (IS_ERR(edev)) {
2159                 if (PTR_ERR(edev) == -EPROBE_DEFER)
2160                         return -EPROBE_DEFER;
2161                 dev_err(ctx->dev, "Invalid or missing extcon\n");
2162                 return PTR_ERR(edev);
2163         }
2164
2165         ctx->extcon = edev;
2166         ctx->extcon_nb.notifier_call = sii8620_extcon_notifier;
2167         INIT_WORK(&ctx->extcon_wq, sii8620_extcon_work);
2168         ret = extcon_register_notifier(edev, EXTCON_DISP_MHL, &ctx->extcon_nb);
2169         if (ret) {
2170                 dev_err(ctx->dev, "failed to register notifier for MHL\n");
2171                 return ret;
2172         }
2173
2174         return 0;
2175 }
2176
2177 static inline struct sii8620 *bridge_to_sii8620(struct drm_bridge *bridge)
2178 {
2179         return container_of(bridge, struct sii8620, bridge);
2180 }
2181
2182 static int sii8620_attach(struct drm_bridge *bridge)
2183 {
2184         struct sii8620 *ctx = bridge_to_sii8620(bridge);
2185
2186         sii8620_init_rcp_input_dev(ctx);
2187
2188         return sii8620_clear_error(ctx);
2189 }
2190
2191 static void sii8620_detach(struct drm_bridge *bridge)
2192 {
2193         struct sii8620 *ctx = bridge_to_sii8620(bridge);
2194
2195         rc_unregister_device(ctx->rc_dev);
2196 }
2197
2198 static int sii8620_is_packing_required(struct sii8620 *ctx,
2199                                        const struct drm_display_mode *mode)
2200 {
2201         int max_pclk, max_pclk_pp_mode;
2202
2203         if (sii8620_is_mhl3(ctx)) {
2204                 max_pclk = MHL3_MAX_PCLK;
2205                 max_pclk_pp_mode = MHL3_MAX_PCLK_PP_MODE;
2206         } else {
2207                 max_pclk = MHL1_MAX_PCLK;
2208                 max_pclk_pp_mode = MHL1_MAX_PCLK_PP_MODE;
2209         }
2210
2211         if (mode->clock < max_pclk)
2212                 return 0;
2213         else if (mode->clock < max_pclk_pp_mode)
2214                 return 1;
2215         else
2216                 return -1;
2217 }
2218
2219 static enum drm_mode_status sii8620_mode_valid(struct drm_bridge *bridge,
2220                                          const struct drm_display_mode *mode)
2221 {
2222         struct sii8620 *ctx = bridge_to_sii8620(bridge);
2223         int pack_required = sii8620_is_packing_required(ctx, mode);
2224         bool can_pack = ctx->devcap[MHL_DCAP_VID_LINK_MODE] &
2225                         MHL_DCAP_VID_LINK_PPIXEL;
2226
2227         switch (pack_required) {
2228         case 0:
2229                 return MODE_OK;
2230         case 1:
2231                 return (can_pack) ? MODE_OK : MODE_CLOCK_HIGH;
2232         default:
2233                 return MODE_CLOCK_HIGH;
2234         }
2235 }
2236
2237 static bool sii8620_mode_fixup(struct drm_bridge *bridge,
2238                                const struct drm_display_mode *mode,
2239                                struct drm_display_mode *adjusted_mode)
2240 {
2241         struct sii8620 *ctx = bridge_to_sii8620(bridge);
2242
2243         mutex_lock(&ctx->lock);
2244
2245         ctx->use_packed_pixel = sii8620_is_packing_required(ctx, adjusted_mode);
2246
2247         mutex_unlock(&ctx->lock);
2248
2249         return true;
2250 }
2251
2252 static const struct drm_bridge_funcs sii8620_bridge_funcs = {
2253         .attach = sii8620_attach,
2254         .detach = sii8620_detach,
2255         .mode_fixup = sii8620_mode_fixup,
2256         .mode_valid = sii8620_mode_valid,
2257 };
2258
2259 static int sii8620_probe(struct i2c_client *client,
2260                          const struct i2c_device_id *id)
2261 {
2262         struct device *dev = &client->dev;
2263         struct sii8620 *ctx;
2264         int ret;
2265
2266         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
2267         if (!ctx)
2268                 return -ENOMEM;
2269
2270         ctx->dev = dev;
2271         mutex_init(&ctx->lock);
2272         INIT_LIST_HEAD(&ctx->mt_queue);
2273
2274         ctx->clk_xtal = devm_clk_get(dev, "xtal");
2275         if (IS_ERR(ctx->clk_xtal)) {
2276                 dev_err(dev, "failed to get xtal clock from DT\n");
2277                 return PTR_ERR(ctx->clk_xtal);
2278         }
2279
2280         if (!client->irq) {
2281                 dev_err(dev, "no irq provided\n");
2282                 return -EINVAL;
2283         }
2284         irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
2285         ret = devm_request_threaded_irq(dev, client->irq, NULL,
2286                                         sii8620_irq_thread,
2287                                         IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
2288                                         "sii8620", ctx);
2289         if (ret < 0) {
2290                 dev_err(dev, "failed to install IRQ handler\n");
2291                 return ret;
2292         }
2293
2294         ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
2295         if (IS_ERR(ctx->gpio_reset)) {
2296                 dev_err(dev, "failed to get reset gpio from DT\n");
2297                 return PTR_ERR(ctx->gpio_reset);
2298         }
2299
2300         ctx->supplies[0].supply = "cvcc10";
2301         ctx->supplies[1].supply = "iovcc18";
2302         ret = devm_regulator_bulk_get(dev, 2, ctx->supplies);
2303         if (ret)
2304                 return ret;
2305
2306         ret = sii8620_extcon_init(ctx);
2307         if (ret < 0) {
2308                 dev_err(ctx->dev, "failed to initialize EXTCON\n");
2309                 return ret;
2310         }
2311
2312         i2c_set_clientdata(client, ctx);
2313
2314         ctx->bridge.funcs = &sii8620_bridge_funcs;
2315         ctx->bridge.of_node = dev->of_node;
2316         drm_bridge_add(&ctx->bridge);
2317
2318         if (!ctx->extcon)
2319                 sii8620_cable_in(ctx);
2320
2321         return 0;
2322 }
2323
2324 static int sii8620_remove(struct i2c_client *client)
2325 {
2326         struct sii8620 *ctx = i2c_get_clientdata(client);
2327
2328         if (ctx->extcon) {
2329                 extcon_unregister_notifier(ctx->extcon, EXTCON_DISP_MHL,
2330                                            &ctx->extcon_nb);
2331                 flush_work(&ctx->extcon_wq);
2332                 if (ctx->cable_state > 0)
2333                         sii8620_cable_out(ctx);
2334         } else {
2335                 sii8620_cable_out(ctx);
2336         }
2337         drm_bridge_remove(&ctx->bridge);
2338
2339         return 0;
2340 }
2341
2342 static const struct of_device_id sii8620_dt_match[] = {
2343         { .compatible = "sil,sii8620" },
2344         { },
2345 };
2346 MODULE_DEVICE_TABLE(of, sii8620_dt_match);
2347
2348 static const struct i2c_device_id sii8620_id[] = {
2349         { "sii8620", 0 },
2350         { },
2351 };
2352
2353 MODULE_DEVICE_TABLE(i2c, sii8620_id);
2354 static struct i2c_driver sii8620_driver = {
2355         .driver = {
2356                 .name   = "sii8620",
2357                 .of_match_table = of_match_ptr(sii8620_dt_match),
2358         },
2359         .probe          = sii8620_probe,
2360         .remove         = sii8620_remove,
2361         .id_table = sii8620_id,
2362 };
2363
2364 module_i2c_driver(sii8620_driver);
2365 MODULE_LICENSE("GPL v2");