drivers/gpu/drm/i915/display/vlv_dsi.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Author: Jani Nikula <jani.nikula@intel.com>
  24  */
  25
  26 #include <linux/slab.h>
  27
  28 #include <drm/drm_atomic_helper.h>
  29 #include <drm/drm_crtc.h>
  30 #include <drm/drm_edid.h>
  31 #include <drm/drm_mipi_dsi.h>
  32
  33 #include "i915_drv.h"
  34 #include "intel_atomic.h"
  35 #include "intel_connector.h"
  36 #include "intel_display_types.h"
  37 #include "intel_dsi.h"
  38 #include "intel_fifo_underrun.h"
  39 #include "intel_panel.h"
  40 #include "intel_sideband.h"
  41
  42 /* return pixels in terms of txbyteclkhs */
  43 static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
  44                        u16 burst_mode_ratio)
  45 {
  46         return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
  47                                          8 * 100), lane_count);
  48 }
  49
  50 /* return pixels equvalent to txbyteclkhs */
  51 static u16 pixels_from_txbyteclkhs(u16 clk_hs, int bpp, int lane_count,
  52                         u16 burst_mode_ratio)
  53 {
  54         return DIV_ROUND_UP((clk_hs * lane_count * 8 * 100),
  55                                                 (bpp * burst_mode_ratio));
  56 }
  57
  58 enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
  59 {
  60         /* It just so happens the VBT matches register contents. */
  61         switch (fmt) {
  62         case VID_MODE_FORMAT_RGB888:
  63                 return MIPI_DSI_FMT_RGB888;
  64         case VID_MODE_FORMAT_RGB666:
  65                 return MIPI_DSI_FMT_RGB666;
  66         case VID_MODE_FORMAT_RGB666_PACKED:
  67                 return MIPI_DSI_FMT_RGB666_PACKED;
  68         case VID_MODE_FORMAT_RGB565:
  69                 return MIPI_DSI_FMT_RGB565;
  70         default:
  71                 MISSING_CASE(fmt);
  72                 return MIPI_DSI_FMT_RGB666;
  73         }
  74 }
  75
  76 void vlv_dsi_wait_for_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
  77 {
  78         struct drm_encoder *encoder = &intel_dsi->base.base;
  79         struct drm_device *dev = encoder->dev;
  80         struct drm_i915_private *dev_priv = to_i915(dev);
  81         u32 mask;
  82
  83         mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
  84                 LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
  85
  86         if (intel_de_wait_for_set(dev_priv, MIPI_GEN_FIFO_STAT(port),
  87                                   mask, 100))
  88                 drm_err(&dev_priv->drm, "DPI FIFOs are not empty\n");
  89 }
  90
  91 static void write_data(struct drm_i915_private *dev_priv,
  92                        i915_reg_t reg,
  93                        const u8 *data, u32 len)
  94 {
  95         u32 i, j;
  96
  97         for (i = 0; i < len; i += 4) {
  98                 u32 val = 0;
  99
 100                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 101                         val |= *data++ << 8 * j;
 102
 103                 intel_de_write(dev_priv, reg, val);
 104         }
 105 }
 106
 107 static void read_data(struct drm_i915_private *dev_priv,
 108                       i915_reg_t reg,
 109                       u8 *data, u32 len)
 110 {
 111         u32 i, j;
 112
 113         for (i = 0; i < len; i += 4) {
 114                 u32 val = intel_de_read(dev_priv, reg);
 115
 116                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 117                         *data++ = val >> 8 * j;
 118         }
 119 }
 120
 121 static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
 122                                        const struct mipi_dsi_msg *msg)
 123 {
 124         struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
 125         struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
 126         struct drm_i915_private *dev_priv = to_i915(dev);
 127         enum port port = intel_dsi_host->port;
 128         struct mipi_dsi_packet packet;
 129         ssize_t ret;
 130         const u8 *header, *data;
 131         i915_reg_t data_reg, ctrl_reg;
 132         u32 data_mask, ctrl_mask;
 133
 134         ret = mipi_dsi_create_packet(&packet, msg);
 135         if (ret < 0)
 136                 return ret;
 137
 138         header = packet.header;
 139         data = packet.payload;
 140
 141         if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
 142                 data_reg = MIPI_LP_GEN_DATA(port);
 143                 data_mask = LP_DATA_FIFO_FULL;
 144                 ctrl_reg = MIPI_LP_GEN_CTRL(port);
 145                 ctrl_mask = LP_CTRL_FIFO_FULL;
 146         } else {
 147                 data_reg = MIPI_HS_GEN_DATA(port);
 148                 data_mask = HS_DATA_FIFO_FULL;
 149                 ctrl_reg = MIPI_HS_GEN_CTRL(port);
 150                 ctrl_mask = HS_CTRL_FIFO_FULL;
 151         }
 152
 153         /* note: this is never true for reads */
 154         if (packet.payload_length) {
 155                 if (intel_de_wait_for_clear(dev_priv, MIPI_GEN_FIFO_STAT(port),
 156                                             data_mask, 50))
 157                         drm_err(&dev_priv->drm,
 158                                 "Timeout waiting for HS/LP DATA FIFO !full\n");
 159
 160                 write_data(dev_priv, data_reg, packet.payload,
 161                            packet.payload_length);
 162         }
 163
 164         if (msg->rx_len) {
 165                 intel_de_write(dev_priv, MIPI_INTR_STAT(port),
 166                                GEN_READ_DATA_AVAIL);
 167         }
 168
 169         if (intel_de_wait_for_clear(dev_priv, MIPI_GEN_FIFO_STAT(port),
 170                                     ctrl_mask, 50)) {
 171                 drm_err(&dev_priv->drm,
 172                         "Timeout waiting for HS/LP CTRL FIFO !full\n");
 173         }
 174
 175         intel_de_write(dev_priv, ctrl_reg,
 176                        header[2] << 16 | header[1] << 8 | header[0]);
 177
 178         /* ->rx_len is set only for reads */
 179         if (msg->rx_len) {
 180                 data_mask = GEN_READ_DATA_AVAIL;
 181                 if (intel_de_wait_for_set(dev_priv, MIPI_INTR_STAT(port),
 182                                           data_mask, 50))
 183                         drm_err(&dev_priv->drm,
 184                                 "Timeout waiting for read data.\n");
 185
 186                 read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
 187         }
 188
 189         /* XXX: fix for reads and writes */
 190         return 4 + packet.payload_length;
 191 }
 192
 193 static int intel_dsi_host_attach(struct mipi_dsi_host *host,
 194                                  struct mipi_dsi_device *dsi)
 195 {
 196         return 0;
 197 }
 198
 199 static int intel_dsi_host_detach(struct mipi_dsi_host *host,
 200                                  struct mipi_dsi_device *dsi)
 201 {
 202         return 0;
 203 }
 204
 205 static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
 206         .attach = intel_dsi_host_attach,
 207         .detach = intel_dsi_host_detach,
 208         .transfer = intel_dsi_host_transfer,
 209 };
 210
 211 /*
 212  * send a video mode command
 213  *
 214  * XXX: commands with data in MIPI_DPI_DATA?
 215  */
 216 static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 217                         enum port port)
 218 {
 219         struct drm_encoder *encoder = &intel_dsi->base.base;
 220         struct drm_device *dev = encoder->dev;
 221         struct drm_i915_private *dev_priv = to_i915(dev);
 222         u32 mask;
 223
 224         /* XXX: pipe, hs */
 225         if (hs)
 226                 cmd &= ~DPI_LP_MODE;
 227         else
 228                 cmd |= DPI_LP_MODE;
 229
 230         /* clear bit */
 231         intel_de_write(dev_priv, MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
 232
 233         /* XXX: old code skips write if control unchanged */
 234         if (cmd == intel_de_read(dev_priv, MIPI_DPI_CONTROL(port)))
 235                 drm_dbg_kms(&dev_priv->drm,
 236                             "Same special packet %02x twice in a row.\n", cmd);
 237
 238         intel_de_write(dev_priv, MIPI_DPI_CONTROL(port), cmd);
 239
 240         mask = SPL_PKT_SENT_INTERRUPT;
 241         if (intel_de_wait_for_set(dev_priv, MIPI_INTR_STAT(port), mask, 100))
 242                 drm_err(&dev_priv->drm,
 243                         "Video mode command 0x%08x send failed.\n", cmd);
 244
 245         return 0;
 246 }
 247
 248 static void band_gap_reset(struct drm_i915_private *dev_priv)
 249 {
 250         vlv_flisdsi_get(dev_priv);
 251
 252         vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
 253         vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
 254         vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
 255         udelay(150);
 256         vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
 257         vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
 258
 259         vlv_flisdsi_put(dev_priv);
 260 }
 261
 262 static int intel_dsi_compute_config(struct intel_encoder *encoder,
 263                                     struct intel_crtc_state *pipe_config,
 264                                     struct drm_connector_state *conn_state)
 265 {
 266         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 267         struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
 268                                                    base);
 269         struct intel_connector *intel_connector = intel_dsi->attached_connector;
 270         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 271         struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 272         int ret;
 273
 274         drm_dbg_kms(&dev_priv->drm, "\n");
 275         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 276
 277         if (fixed_mode) {
 278                 intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 279
 280                 if (HAS_GMCH(dev_priv))
 281                         ret = intel_gmch_panel_fitting(pipe_config, conn_state);
 282                 else
 283                         ret = intel_pch_panel_fitting(pipe_config, conn_state);
 284                 if (ret)
 285                         return ret;
 286         }
 287
 288         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 289                 return -EINVAL;
 290
 291         /* DSI uses short packets for sync events, so clear mode flags for DSI */
 292         adjusted_mode->flags = 0;
 293
 294         if (intel_dsi->pixel_format == MIPI_DSI_FMT_RGB888)
 295                 pipe_config->pipe_bpp = 24;
 296         else
 297                 pipe_config->pipe_bpp = 18;
 298
 299         if (IS_GEN9_LP(dev_priv)) {
 300                 /* Enable Frame time stamp based scanline reporting */
 301                 adjusted_mode->private_flags |=
 302                         I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
 303
 304                 /* Dual link goes to DSI transcoder A. */
 305                 if (intel_dsi->ports == BIT(PORT_C))
 306                         pipe_config->cpu_transcoder = TRANSCODER_DSI_C;
 307                 else
 308                         pipe_config->cpu_transcoder = TRANSCODER_DSI_A;
 309
 310                 ret = bxt_dsi_pll_compute(encoder, pipe_config);
 311                 if (ret)
 312                         return -EINVAL;
 313         } else {
 314                 ret = vlv_dsi_pll_compute(encoder, pipe_config);
 315                 if (ret)
 316                         return -EINVAL;
 317         }
 318
 319         pipe_config->clock_set = true;
 320
 321         return 0;
 322 }
 323
 324 static bool glk_dsi_enable_io(struct intel_encoder *encoder)
 325 {
 326         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 327         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 328         enum port port;
 329         u32 tmp;
 330         bool cold_boot = false;
 331
 332         /* Set the MIPI mode
 333          * If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
 334          * Power ON MIPI IO first and then write into IO reset and LP wake bits
 335          */
 336         for_each_dsi_port(port, intel_dsi->ports) {
 337                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 338                 intel_de_write(dev_priv, MIPI_CTRL(port),
 339                                tmp | GLK_MIPIIO_ENABLE);
 340         }
 341
 342         /* Put the IO into reset */
 343         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 344         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 345         intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
 346
 347         /* Program LP Wake */
 348         for_each_dsi_port(port, intel_dsi->ports) {
 349                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 350                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY))
 351                         tmp &= ~GLK_LP_WAKE;
 352                 else
 353                         tmp |= GLK_LP_WAKE;
 354                 intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
 355         }
 356
 357         /* Wait for Pwr ACK */
 358         for_each_dsi_port(port, intel_dsi->ports) {
 359                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 360                                           GLK_MIPIIO_PORT_POWERED, 20))
 361                         drm_err(&dev_priv->drm, "MIPIO port is powergated\n");
 362         }
 363
 364         /* Check for cold boot scenario */
 365         for_each_dsi_port(port, intel_dsi->ports) {
 366                 cold_boot |=
 367                         !(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY);
 368         }
 369
 370         return cold_boot;
 371 }
 372
 373 static void glk_dsi_device_ready(struct intel_encoder *encoder)
 374 {
 375         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 376         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 377         enum port port;
 378         u32 val;
 379
 380         /* Wait for MIPI PHY status bit to set */
 381         for_each_dsi_port(port, intel_dsi->ports) {
 382                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 383                                           GLK_PHY_STATUS_PORT_READY, 20))
 384                         drm_err(&dev_priv->drm, "PHY is not ON\n");
 385         }
 386
 387         /* Get IO out of reset */
 388         val = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 389         intel_de_write(dev_priv, MIPI_CTRL(PORT_A),
 390                        val | GLK_MIPIIO_RESET_RELEASED);
 391
 392         /* Get IO out of Low power state*/
 393         for_each_dsi_port(port, intel_dsi->ports) {
 394                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY)) {
 395                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 396                         val &= ~ULPS_STATE_MASK;
 397                         val |= DEVICE_READY;
 398                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 399                         usleep_range(10, 15);
 400                 } else {
 401                         /* Enter ULPS */
 402                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 403                         val &= ~ULPS_STATE_MASK;
 404                         val |= (ULPS_STATE_ENTER | DEVICE_READY);
 405                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 406
 407                         /* Wait for ULPS active */
 408                         if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 409                                                     GLK_ULPS_NOT_ACTIVE, 20))
 410                                 drm_err(&dev_priv->drm, "ULPS not active\n");
 411
 412                         /* Exit ULPS */
 413                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 414                         val &= ~ULPS_STATE_MASK;
 415                         val |= (ULPS_STATE_EXIT | DEVICE_READY);
 416                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 417
 418                         /* Enter Normal Mode */
 419                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 420                         val &= ~ULPS_STATE_MASK;
 421                         val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
 422                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 423
 424                         val = intel_de_read(dev_priv, MIPI_CTRL(port));
 425                         val &= ~GLK_LP_WAKE;
 426                         intel_de_write(dev_priv, MIPI_CTRL(port), val);
 427                 }
 428         }
 429
 430         /* Wait for Stop state */
 431         for_each_dsi_port(port, intel_dsi->ports) {
 432                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 433                                           GLK_DATA_LANE_STOP_STATE, 20))
 434                         drm_err(&dev_priv->drm,
 435                                 "Date lane not in STOP state\n");
 436         }
 437
 438         /* Wait for AFE LATCH */
 439         for_each_dsi_port(port, intel_dsi->ports) {
 440                 if (intel_de_wait_for_set(dev_priv, BXT_MIPI_PORT_CTRL(port),
 441                                           AFE_LATCHOUT, 20))
 442                         drm_err(&dev_priv->drm,
 443                                 "D-PHY not entering LP-11 state\n");
 444         }
 445 }
 446
 447 static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 448 {
 449         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 450         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 451         enum port port;
 452         u32 val;
 453
 454         drm_dbg_kms(&dev_priv->drm, "\n");
 455
 456         /* Enable MIPI PHY transparent latch */
 457         for_each_dsi_port(port, intel_dsi->ports) {
 458                 val = intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port));
 459                 intel_de_write(dev_priv, BXT_MIPI_PORT_CTRL(port),
 460                                val | LP_OUTPUT_HOLD);
 461                 usleep_range(2000, 2500);
 462         }
 463
 464         /* Clear ULPS and set device ready */
 465         for_each_dsi_port(port, intel_dsi->ports) {
 466                 val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 467                 val &= ~ULPS_STATE_MASK;
 468                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 469                 usleep_range(2000, 2500);
 470                 val |= DEVICE_READY;
 471                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 472         }
 473 }
 474
 475 static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 476 {
 477         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 478         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 479         enum port port;
 480         u32 val;
 481
 482         drm_dbg_kms(&dev_priv->drm, "\n");
 483
 484         vlv_flisdsi_get(dev_priv);
 485         /* program rcomp for compliance, reduce from 50 ohms to 45 ohms
 486          * needed everytime after power gate */
 487         vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
 488         vlv_flisdsi_put(dev_priv);
 489
 490         /* bandgap reset is needed after everytime we do power gate */
 491         band_gap_reset(dev_priv);
 492
 493         for_each_dsi_port(port, intel_dsi->ports) {
 494
 495                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 496                                ULPS_STATE_ENTER);
 497                 usleep_range(2500, 3000);
 498
 499                 /* Enable MIPI PHY transparent latch
 500                  * Common bit for both MIPI Port A & MIPI Port C
 501                  * No similar bit in MIPI Port C reg
 502                  */
 503                 val = intel_de_read(dev_priv, MIPI_PORT_CTRL(PORT_A));
 504                 intel_de_write(dev_priv, MIPI_PORT_CTRL(PORT_A),
 505                                val | LP_OUTPUT_HOLD);
 506                 usleep_range(1000, 1500);
 507
 508                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 509                                ULPS_STATE_EXIT);
 510                 usleep_range(2500, 3000);
 511
 512                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 513                                DEVICE_READY);
 514                 usleep_range(2500, 3000);
 515         }
 516 }
 517
 518 static void intel_dsi_device_ready(struct intel_encoder *encoder)
 519 {
 520         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 521
 522         if (IS_GEMINILAKE(dev_priv))
 523                 glk_dsi_device_ready(encoder);
 524         else if (IS_GEN9_LP(dev_priv))
 525                 bxt_dsi_device_ready(encoder);
 526         else
 527                 vlv_dsi_device_ready(encoder);
 528 }
 529
 530 static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
 531 {
 532         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 533         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 534         enum port port;
 535         u32 val;
 536
 537         /* Enter ULPS */
 538         for_each_dsi_port(port, intel_dsi->ports) {
 539                 val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 540                 val &= ~ULPS_STATE_MASK;
 541                 val |= (ULPS_STATE_ENTER | DEVICE_READY);
 542                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 543         }
 544
 545         /* Wait for MIPI PHY status bit to unset */
 546         for_each_dsi_port(port, intel_dsi->ports) {
 547                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 548                                             GLK_PHY_STATUS_PORT_READY, 20))
 549                         drm_err(&dev_priv->drm, "PHY is not turning OFF\n");
 550         }
 551
 552         /* Wait for Pwr ACK bit to unset */
 553         for_each_dsi_port(port, intel_dsi->ports) {
 554                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 555                                             GLK_MIPIIO_PORT_POWERED, 20))
 556                         drm_err(&dev_priv->drm,
 557                                 "MIPI IO Port is not powergated\n");
 558         }
 559 }
 560
 561 static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
 562 {
 563         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 564         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 565         enum port port;
 566         u32 tmp;
 567
 568         /* Put the IO into reset */
 569         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 570         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 571         intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
 572
 573         /* Wait for MIPI PHY status bit to unset */
 574         for_each_dsi_port(port, intel_dsi->ports) {
 575                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 576                                             GLK_PHY_STATUS_PORT_READY, 20))
 577                         drm_err(&dev_priv->drm, "PHY is not turning OFF\n");
 578         }
 579
 580         /* Clear MIPI mode */
 581         for_each_dsi_port(port, intel_dsi->ports) {
 582                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 583                 tmp &= ~GLK_MIPIIO_ENABLE;
 584                 intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
 585         }
 586 }
 587
 588 static void glk_dsi_clear_device_ready(struct intel_encoder *encoder)
 589 {
 590         glk_dsi_enter_low_power_mode(encoder);
 591         glk_dsi_disable_mipi_io(encoder);
 592 }
 593
 594 static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
 595 {
 596         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 597         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 598         enum port port;
 599
 600         drm_dbg_kms(&dev_priv->drm, "\n");
 601         for_each_dsi_port(port, intel_dsi->ports) {
 602                 /* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
 603                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 604                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
 605                 u32 val;
 606
 607                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 608                                DEVICE_READY | ULPS_STATE_ENTER);
 609                 usleep_range(2000, 2500);
 610
 611                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 612                                DEVICE_READY | ULPS_STATE_EXIT);
 613                 usleep_range(2000, 2500);
 614
 615                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 616                                DEVICE_READY | ULPS_STATE_ENTER);
 617                 usleep_range(2000, 2500);
 618
 619                 /*
 620                  * On VLV/CHV, wait till Clock lanes are in LP-00 state for MIPI
 621                  * Port A only. MIPI Port C has no similar bit for checking.
 622                  */
 623                 if ((IS_GEN9_LP(dev_priv) || port == PORT_A) &&
 624                     intel_de_wait_for_clear(dev_priv, port_ctrl,
 625                                             AFE_LATCHOUT, 30))
 626                         drm_err(&dev_priv->drm, "DSI LP not going Low\n");
 627
 628                 /* Disable MIPI PHY transparent latch */
 629                 val = intel_de_read(dev_priv, port_ctrl);
 630                 intel_de_write(dev_priv, port_ctrl, val & ~LP_OUTPUT_HOLD);
 631                 usleep_range(1000, 1500);
 632
 633                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x00);
 634                 usleep_range(2000, 2500);
 635         }
 636 }
 637
 638 static void intel_dsi_port_enable(struct intel_encoder *encoder,
 639                                   const struct intel_crtc_state *crtc_state)
 640 {
 641         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 642         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 643         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 644         enum port port;
 645
 646         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
 647                 u32 temp;
 648                 if (IS_GEN9_LP(dev_priv)) {
 649                         for_each_dsi_port(port, intel_dsi->ports) {
 650                                 temp = intel_de_read(dev_priv,
 651                                                      MIPI_CTRL(port));
 652                                 temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
 653                                         intel_dsi->pixel_overlap <<
 654                                         BXT_PIXEL_OVERLAP_CNT_SHIFT;
 655                                 intel_de_write(dev_priv, MIPI_CTRL(port),
 656                                                temp);
 657                         }
 658                 } else {
 659                         temp = intel_de_read(dev_priv, VLV_CHICKEN_3);
 660                         temp &= ~PIXEL_OVERLAP_CNT_MASK |
 661                                         intel_dsi->pixel_overlap <<
 662                                         PIXEL_OVERLAP_CNT_SHIFT;
 663                         intel_de_write(dev_priv, VLV_CHICKEN_3, temp);
 664                 }
 665         }
 666
 667         for_each_dsi_port(port, intel_dsi->ports) {
 668                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 669                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 670                 u32 temp;
 671
 672                 temp = intel_de_read(dev_priv, port_ctrl);
 673
 674                 temp &= ~LANE_CONFIGURATION_MASK;
 675                 temp &= ~DUAL_LINK_MODE_MASK;
 676
 677                 if (intel_dsi->ports == (BIT(PORT_A) | BIT(PORT_C))) {
 678                         temp |= (intel_dsi->dual_link - 1)
 679                                                 << DUAL_LINK_MODE_SHIFT;
 680                         if (IS_BROXTON(dev_priv))
 681                                 temp |= LANE_CONFIGURATION_DUAL_LINK_A;
 682                         else
 683                                 temp |= crtc->pipe ?
 684                                         LANE_CONFIGURATION_DUAL_LINK_B :
 685                                         LANE_CONFIGURATION_DUAL_LINK_A;
 686                 }
 687
 688                 if (intel_dsi->pixel_format != MIPI_DSI_FMT_RGB888)
 689                         temp |= DITHERING_ENABLE;
 690
 691                 /* assert ip_tg_enable signal */
 692                 intel_de_write(dev_priv, port_ctrl, temp | DPI_ENABLE);
 693                 intel_de_posting_read(dev_priv, port_ctrl);
 694         }
 695 }
 696
 697 static void intel_dsi_port_disable(struct intel_encoder *encoder)
 698 {
 699         struct drm_device *dev = encoder->base.dev;
 700         struct drm_i915_private *dev_priv = to_i915(dev);
 701         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 702         enum port port;
 703
 704         for_each_dsi_port(port, intel_dsi->ports) {
 705                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 706                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 707                 u32 temp;
 708
 709                 /* de-assert ip_tg_enable signal */
 710                 temp = intel_de_read(dev_priv, port_ctrl);
 711                 intel_de_write(dev_priv, port_ctrl, temp & ~DPI_ENABLE);
 712                 intel_de_posting_read(dev_priv, port_ctrl);
 713         }
 714 }
 715
 716 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
 717                               const struct intel_crtc_state *pipe_config);
 718 static void intel_dsi_unprepare(struct intel_encoder *encoder);
 719
 720 /*
 721  * Panel enable/disable sequences from the VBT spec.
 722  *
 723  * Note the spec has AssertReset / DeassertReset swapped from their
 724  * usual naming. We use the normal names to avoid confusion (so below
 725  * they are swapped compared to the spec).
 726  *
 727  * Steps starting with MIPI refer to VBT sequences, note that for v2
 728  * VBTs several steps which have a VBT in v2 are expected to be handled
 729  * directly by the driver, by directly driving gpios for example.
 730  *
 731  * v2 video mode seq         v3 video mode seq         command mode seq
 732  * - power on                - MIPIPanelPowerOn        - power on
 733  * - wait t1+t2                                        - wait t1+t2
 734  * - MIPIDeassertResetPin    - MIPIDeassertResetPin    - MIPIDeassertResetPin
 735  * - io lines to lp-11       - io lines to lp-11       - io lines to lp-11
 736  * - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds
 737  *                                                     - MIPITearOn
 738  *                                                     - MIPIDisplayOn
 739  * - turn on DPI             - turn on DPI             - set pipe to dsr mode
 740  * - MIPIDisplayOn           - MIPIDisplayOn
 741  * - wait t5                                           - wait t5
 742  * - backlight on            - MIPIBacklightOn         - backlight on
 743  * ...                       ...                       ... issue mem cmds ...
 744  * - backlight off           - MIPIBacklightOff        - backlight off
 745  * - wait t6                                           - wait t6
 746  * - MIPIDisplayOff
 747  * - turn off DPI            - turn off DPI            - disable pipe dsr mode
 748  *                                                     - MIPITearOff
 749  *                           - MIPIDisplayOff          - MIPIDisplayOff
 750  * - io lines to lp-00       - io lines to lp-00       - io lines to lp-00
 751  * - MIPIAssertResetPin      - MIPIAssertResetPin      - MIPIAssertResetPin
 752  * - wait t3                                           - wait t3
 753  * - power off               - MIPIPanelPowerOff       - power off
 754  * - wait t4                                           - wait t4
 755  */
 756
 757 /*
 758  * DSI port enable has to be done before pipe and plane enable, so we do it in
 759  * the pre_enable hook instead of the enable hook.
 760  */
 761 static void intel_dsi_pre_enable(struct intel_atomic_state *state,
 762                                  struct intel_encoder *encoder,
 763                                  const struct intel_crtc_state *pipe_config,
 764                                  const struct drm_connector_state *conn_state)
 765 {
 766         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 767         struct drm_crtc *crtc = pipe_config->uapi.crtc;
 768         struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 769         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 770         enum pipe pipe = intel_crtc->pipe;
 771         enum port port;
 772         u32 val;
 773         bool glk_cold_boot = false;
 774
 775         drm_dbg_kms(&dev_priv->drm, "\n");
 776
 777         intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
 778
 779         /*
 780          * The BIOS may leave the PLL in a wonky state where it doesn't
 781          * lock. It needs to be fully powered down to fix it.
 782          */
 783         if (IS_GEN9_LP(dev_priv)) {
 784                 bxt_dsi_pll_disable(encoder);
 785                 bxt_dsi_pll_enable(encoder, pipe_config);
 786         } else {
 787                 vlv_dsi_pll_disable(encoder);
 788                 vlv_dsi_pll_enable(encoder, pipe_config);
 789         }
 790
 791         if (IS_BROXTON(dev_priv)) {
 792                 /* Add MIPI IO reset programming for modeset */
 793                 val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
 794                 intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
 795                                val | MIPIO_RST_CTRL);
 796
 797                 /* Power up DSI regulator */
 798                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 799                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_TX_CTRL, 0);
 800         }
 801
 802         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 803                 u32 val;
 804
 805                 /* Disable DPOunit clock gating, can stall pipe */
 806                 val = intel_de_read(dev_priv, DSPCLK_GATE_D);
 807                 val |= DPOUNIT_CLOCK_GATE_DISABLE;
 808                 intel_de_write(dev_priv, DSPCLK_GATE_D, val);
 809         }
 810
 811         if (!IS_GEMINILAKE(dev_priv))
 812                 intel_dsi_prepare(encoder, pipe_config);
 813
 814         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
 815         intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay);
 816
 817         /* Deassert reset */
 818         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
 819
 820         if (IS_GEMINILAKE(dev_priv)) {
 821                 glk_cold_boot = glk_dsi_enable_io(encoder);
 822
 823                 /* Prepare port in cold boot(s3/s4) scenario */
 824                 if (glk_cold_boot)
 825                         intel_dsi_prepare(encoder, pipe_config);
 826         }
 827
 828         /* Put device in ready state (LP-11) */
 829         intel_dsi_device_ready(encoder);
 830
 831         /* Prepare port in normal boot scenario */
 832         if (IS_GEMINILAKE(dev_priv) && !glk_cold_boot)
 833                 intel_dsi_prepare(encoder, pipe_config);
 834
 835         /* Send initialization commands in LP mode */
 836         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
 837
 838         /* Enable port in pre-enable phase itself because as per hw team
 839          * recommendation, port should be enabled befor plane & pipe */
 840         if (is_cmd_mode(intel_dsi)) {
 841                 for_each_dsi_port(port, intel_dsi->ports)
 842                         intel_de_write(dev_priv,
 843                                        MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
 844                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_ON);
 845                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 846         } else {
 847                 msleep(20); /* XXX */
 848                 for_each_dsi_port(port, intel_dsi->ports)
 849                         dpi_send_cmd(intel_dsi, TURN_ON, false, port);
 850                 intel_dsi_msleep(intel_dsi, 100);
 851
 852                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 853
 854                 intel_dsi_port_enable(encoder, pipe_config);
 855         }
 856
 857         intel_panel_enable_backlight(pipe_config, conn_state);
 858         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_ON);
 859 }
 860
 861 static void bxt_dsi_enable(struct intel_atomic_state *state,
 862                            struct intel_encoder *encoder,
 863                            const struct intel_crtc_state *crtc_state,
 864                            const struct drm_connector_state *conn_state)
 865 {
 866         drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);
 867
 868         intel_crtc_vblank_on(crtc_state);
 869 }
 870
 871 /*
 872  * DSI port disable has to be done after pipe and plane disable, so we do it in
 873  * the post_disable hook.
 874  */
 875 static void intel_dsi_disable(struct intel_atomic_state *state,
 876                               struct intel_encoder *encoder,
 877                               const struct intel_crtc_state *old_crtc_state,
 878                               const struct drm_connector_state *old_conn_state)
 879 {
 880         struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 881         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 882         enum port port;
 883
 884         drm_dbg_kms(&i915->drm, "\n");
 885
 886         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
 887         intel_panel_disable_backlight(old_conn_state);
 888
 889         /*
 890          * According to the spec we should send SHUTDOWN before
 891          * MIPI_SEQ_DISPLAY_OFF only for v3+ VBTs, but field testing
 892          * has shown that the v3 sequence works for v2 VBTs too
 893          */
 894         if (is_vid_mode(intel_dsi)) {
 895                 /* Send Shutdown command to the panel in LP mode */
 896                 for_each_dsi_port(port, intel_dsi->ports)
 897                         dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
 898                 msleep(10);
 899         }
 900 }
 901
 902 static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
 903 {
 904         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 905
 906         if (IS_GEMINILAKE(dev_priv))
 907                 glk_dsi_clear_device_ready(encoder);
 908         else
 909                 vlv_dsi_clear_device_ready(encoder);
 910 }
 911
 912 static void intel_dsi_post_disable(struct intel_atomic_state *state,
 913                                    struct intel_encoder *encoder,
 914                                    const struct intel_crtc_state *old_crtc_state,
 915                                    const struct drm_connector_state *old_conn_state)
 916 {
 917         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 918         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 919         enum port port;
 920         u32 val;
 921
 922         drm_dbg_kms(&dev_priv->drm, "\n");
 923
 924         if (IS_GEN9_LP(dev_priv)) {
 925                 intel_crtc_vblank_off(old_crtc_state);
 926
 927                 skl_scaler_disable(old_crtc_state);
 928         }
 929
 930         if (is_vid_mode(intel_dsi)) {
 931                 for_each_dsi_port(port, intel_dsi->ports)
 932                         vlv_dsi_wait_for_fifo_empty(intel_dsi, port);
 933
 934                 intel_dsi_port_disable(encoder);
 935                 usleep_range(2000, 5000);
 936         }
 937
 938         intel_dsi_unprepare(encoder);
 939
 940         /*
 941          * if disable packets are sent before sending shutdown packet then in
 942          * some next enable sequence send turn on packet error is observed
 943          */
 944         if (is_cmd_mode(intel_dsi))
 945                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_OFF);
 946         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);
 947
 948         /* Transition to LP-00 */
 949         intel_dsi_clear_device_ready(encoder);
 950
 951         if (IS_BROXTON(dev_priv)) {
 952                 /* Power down DSI regulator to save power */
 953                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 954                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_TX_CTRL,
 955                                HS_IO_CTRL_SELECT);
 956
 957                 /* Add MIPI IO reset programming for modeset */
 958                 val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
 959                 intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
 960                                val & ~MIPIO_RST_CTRL);
 961         }
 962
 963         if (IS_GEN9_LP(dev_priv)) {
 964                 bxt_dsi_pll_disable(encoder);
 965         } else {
 966                 u32 val;
 967
 968                 vlv_dsi_pll_disable(encoder);
 969
 970                 val = intel_de_read(dev_priv, DSPCLK_GATE_D);
 971                 val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
 972                 intel_de_write(dev_priv, DSPCLK_GATE_D, val);
 973         }
 974
 975         /* Assert reset */
 976         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_ASSERT_RESET);
 977
 978         intel_dsi_msleep(intel_dsi, intel_dsi->panel_off_delay);
 979         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_OFF);
 980
 981         /*
 982          * FIXME As we do with eDP, just make a note of the time here
 983          * and perform the wait before the next panel power on.
 984          */
 985         intel_dsi_msleep(intel_dsi, intel_dsi->panel_pwr_cycle_delay);
 986 }
 987
 988 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 989                                    enum pipe *pipe)
 990 {
 991         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 992         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 993         intel_wakeref_t wakeref;
 994         enum port port;
 995         bool active = false;
 996
 997         drm_dbg_kms(&dev_priv->drm, "\n");
 998
 999         wakeref = intel_display_power_get_if_enabled(dev_priv,
1000                                                      encoder->power_domain);
1001         if (!wakeref)
1002                 return false;
1003
1004         /*
1005          * On Broxton the PLL needs to be enabled with a valid divider
1006          * configuration, otherwise accessing DSI registers will hang the
1007          * machine. See BSpec North Display Engine registers/MIPI[BXT].
1008          */
1009         if (IS_GEN9_LP(dev_priv) && !bxt_dsi_pll_is_enabled(dev_priv))
1010                 goto out_put_power;
1011
1012         /* XXX: this only works for one DSI output */
1013         for_each_dsi_port(port, intel_dsi->ports) {
1014                 i915_reg_t ctrl_reg = IS_GEN9_LP(dev_priv) ?
1015                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
1016                 bool enabled = intel_de_read(dev_priv, ctrl_reg) & DPI_ENABLE;
1017
1018                 /*
1019                  * Due to some hardware limitations on VLV/CHV, the DPI enable
1020                  * bit in port C control register does not get set. As a
1021                  * workaround, check pipe B conf instead.
1022                  */
1023                 if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
1024                     port == PORT_C)
1025                         enabled = intel_de_read(dev_priv, PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
1026
1027                 /* Try command mode if video mode not enabled */
1028                 if (!enabled) {
1029                         u32 tmp = intel_de_read(dev_priv,
1030                                                 MIPI_DSI_FUNC_PRG(port));
1031                         enabled = tmp & CMD_MODE_DATA_WIDTH_MASK;
1032                 }
1033
1034                 if (!enabled)
1035                         continue;
1036
1037                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY))
1038                         continue;
1039
1040                 if (IS_GEN9_LP(dev_priv)) {
1041                         u32 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1042                         tmp &= BXT_PIPE_SELECT_MASK;
1043                         tmp >>= BXT_PIPE_SELECT_SHIFT;
1044
1045                         if (drm_WARN_ON(&dev_priv->drm, tmp > PIPE_C))
1046                                 continue;
1047
1048                         *pipe = tmp;
1049                 } else {
1050                         *pipe = port == PORT_A ? PIPE_A : PIPE_B;
1051                 }
1052
1053                 active = true;
1054                 break;
1055         }
1056
1057 out_put_power:
1058         intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
1059
1060         return active;
1061 }
1062
1063 static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
1064                                     struct intel_crtc_state *pipe_config)
1065 {
1066         struct drm_device *dev = encoder->base.dev;
1067         struct drm_i915_private *dev_priv = to_i915(dev);
1068         struct drm_display_mode *adjusted_mode =
1069                                         &pipe_config->hw.adjusted_mode;
1070         struct drm_display_mode *adjusted_mode_sw;
1071         struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
1072         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1073         unsigned int lane_count = intel_dsi->lane_count;
1074         unsigned int bpp, fmt;
1075         enum port port;
1076         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1077         u16 hfp_sw, hsync_sw, hbp_sw;
1078         u16 crtc_htotal_sw, crtc_hsync_start_sw, crtc_hsync_end_sw,
1079                                 crtc_hblank_start_sw, crtc_hblank_end_sw;
1080
1081         /* FIXME: hw readout should not depend on SW state */
1082         adjusted_mode_sw = &crtc->config->hw.adjusted_mode;
1083
1084         /*
1085          * Atleast one port is active as encoder->get_config called only if
1086          * encoder->get_hw_state() returns true.
1087          */
1088         for_each_dsi_port(port, intel_dsi->ports) {
1089                 if (intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
1090                         break;
1091         }
1092
1093         fmt = intel_de_read(dev_priv, MIPI_DSI_FUNC_PRG(port)) & VID_MODE_FORMAT_MASK;
1094         bpp = mipi_dsi_pixel_format_to_bpp(
1095                         pixel_format_from_register_bits(fmt));
1096
1097         pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
1098
1099         /* Enable Frame time stamo based scanline reporting */
1100         adjusted_mode->private_flags |=
1101                         I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
1102
1103         /* In terms of pixels */
1104         adjusted_mode->crtc_hdisplay =
1105                                 intel_de_read(dev_priv,
1106                                               BXT_MIPI_TRANS_HACTIVE(port));
1107         adjusted_mode->crtc_vdisplay =
1108                                 intel_de_read(dev_priv,
1109                                               BXT_MIPI_TRANS_VACTIVE(port));
1110         adjusted_mode->crtc_vtotal =
1111                                 intel_de_read(dev_priv,
1112                                               BXT_MIPI_TRANS_VTOTAL(port));
1113
1114         hactive = adjusted_mode->crtc_hdisplay;
1115         hfp = intel_de_read(dev_priv, MIPI_HFP_COUNT(port));
1116
1117         /*
1118          * Meaningful for video mode non-burst sync pulse mode only,
1119          * can be zero for non-burst sync events and burst modes
1120          */
1121         hsync = intel_de_read(dev_priv, MIPI_HSYNC_PADDING_COUNT(port));
1122         hbp = intel_de_read(dev_priv, MIPI_HBP_COUNT(port));
1123
1124         /* harizontal values are in terms of high speed byte clock */
1125         hfp = pixels_from_txbyteclkhs(hfp, bpp, lane_count,
1126                                                 intel_dsi->burst_mode_ratio);
1127         hsync = pixels_from_txbyteclkhs(hsync, bpp, lane_count,
1128                                                 intel_dsi->burst_mode_ratio);
1129         hbp = pixels_from_txbyteclkhs(hbp, bpp, lane_count,
1130                                                 intel_dsi->burst_mode_ratio);
1131
1132         if (intel_dsi->dual_link) {
1133                 hfp *= 2;
1134                 hsync *= 2;
1135                 hbp *= 2;
1136         }
1137
1138         /* vertical values are in terms of lines */
1139         vfp = intel_de_read(dev_priv, MIPI_VFP_COUNT(port));
1140         vsync = intel_de_read(dev_priv, MIPI_VSYNC_PADDING_COUNT(port));
1141         vbp = intel_de_read(dev_priv, MIPI_VBP_COUNT(port));
1142
1143         adjusted_mode->crtc_htotal = hactive + hfp + hsync + hbp;
1144         adjusted_mode->crtc_hsync_start = hfp + adjusted_mode->crtc_hdisplay;
1145         adjusted_mode->crtc_hsync_end = hsync + adjusted_mode->crtc_hsync_start;
1146         adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
1147         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;
1148
1149         adjusted_mode->crtc_vsync_start = vfp + adjusted_mode->crtc_vdisplay;
1150         adjusted_mode->crtc_vsync_end = vsync + adjusted_mode->crtc_vsync_start;
1151         adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
1152         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
1153
1154         /*
1155          * In BXT DSI there is no regs programmed with few horizontal timings
1156          * in Pixels but txbyteclkhs.. So retrieval process adds some
1157          * ROUND_UP ERRORS in the process of PIXELS<==>txbyteclkhs.
1158          * Actually here for the given adjusted_mode, we are calculating the
1159          * value programmed to the port and then back to the horizontal timing
1160          * param in pixels. This is the expected value, including roundup errors
1161          * And if that is same as retrieved value from port, then
1162          * (HW state) adjusted_mode's horizontal timings are corrected to
1163          * match with SW state to nullify the errors.
1164          */
1165         /* Calculating the value programmed to the Port register */
1166         hfp_sw = adjusted_mode_sw->crtc_hsync_start -
1167                                         adjusted_mode_sw->crtc_hdisplay;
1168         hsync_sw = adjusted_mode_sw->crtc_hsync_end -
1169                                         adjusted_mode_sw->crtc_hsync_start;
1170         hbp_sw = adjusted_mode_sw->crtc_htotal -
1171                                         adjusted_mode_sw->crtc_hsync_end;
1172
1173         if (intel_dsi->dual_link) {
1174                 hfp_sw /= 2;
1175                 hsync_sw /= 2;
1176                 hbp_sw /= 2;
1177         }
1178
1179         hfp_sw = txbyteclkhs(hfp_sw, bpp, lane_count,
1180                                                 intel_dsi->burst_mode_ratio);
1181         hsync_sw = txbyteclkhs(hsync_sw, bpp, lane_count,
1182                             intel_dsi->burst_mode_ratio);
1183         hbp_sw = txbyteclkhs(hbp_sw, bpp, lane_count,
1184                                                 intel_dsi->burst_mode_ratio);
1185
1186         /* Reverse calculating the adjusted mode parameters from port reg vals*/
1187         hfp_sw = pixels_from_txbyteclkhs(hfp_sw, bpp, lane_count,
1188                                                 intel_dsi->burst_mode_ratio);
1189         hsync_sw = pixels_from_txbyteclkhs(hsync_sw, bpp, lane_count,
1190                                                 intel_dsi->burst_mode_ratio);
1191         hbp_sw = pixels_from_txbyteclkhs(hbp_sw, bpp, lane_count,
1192                                                 intel_dsi->burst_mode_ratio);
1193
1194         if (intel_dsi->dual_link) {
1195                 hfp_sw *= 2;
1196                 hsync_sw *= 2;
1197                 hbp_sw *= 2;
1198         }
1199
1200         crtc_htotal_sw = adjusted_mode_sw->crtc_hdisplay + hfp_sw +
1201                                                         hsync_sw + hbp_sw;
1202         crtc_hsync_start_sw = hfp_sw + adjusted_mode_sw->crtc_hdisplay;
1203         crtc_hsync_end_sw = hsync_sw + crtc_hsync_start_sw;
1204         crtc_hblank_start_sw = adjusted_mode_sw->crtc_hdisplay;
1205         crtc_hblank_end_sw = crtc_htotal_sw;
1206
1207         if (adjusted_mode->crtc_htotal == crtc_htotal_sw)
1208                 adjusted_mode->crtc_htotal = adjusted_mode_sw->crtc_htotal;
1209
1210         if (adjusted_mode->crtc_hsync_start == crtc_hsync_start_sw)
1211                 adjusted_mode->crtc_hsync_start =
1212                                         adjusted_mode_sw->crtc_hsync_start;
1213
1214         if (adjusted_mode->crtc_hsync_end == crtc_hsync_end_sw)
1215                 adjusted_mode->crtc_hsync_end =
1216                                         adjusted_mode_sw->crtc_hsync_end;
1217
1218         if (adjusted_mode->crtc_hblank_start == crtc_hblank_start_sw)
1219                 adjusted_mode->crtc_hblank_start =
1220                                         adjusted_mode_sw->crtc_hblank_start;
1221
1222         if (adjusted_mode->crtc_hblank_end == crtc_hblank_end_sw)
1223                 adjusted_mode->crtc_hblank_end =
1224                                         adjusted_mode_sw->crtc_hblank_end;
1225 }
1226
1227 static void intel_dsi_get_config(struct intel_encoder *encoder,
1228                                  struct intel_crtc_state *pipe_config)
1229 {
1230         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1231         u32 pclk;
1232         drm_dbg_kms(&dev_priv->drm, "\n");
1233
1234         pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
1235
1236         if (IS_GEN9_LP(dev_priv)) {
1237                 bxt_dsi_get_pipe_config(encoder, pipe_config);
1238                 pclk = bxt_dsi_get_pclk(encoder, pipe_config);
1239         } else {
1240                 pclk = vlv_dsi_get_pclk(encoder, pipe_config);
1241         }
1242
1243         if (pclk) {
1244                 pipe_config->hw.adjusted_mode.crtc_clock = pclk;
1245                 pipe_config->port_clock = pclk;
1246         }
1247 }
1248
1249 /* return txclkesc cycles in terms of divider and duration in us */
1250 static u16 txclkesc(u32 divider, unsigned int us)
1251 {
1252         switch (divider) {
1253         case ESCAPE_CLOCK_DIVIDER_1:
1254         default:
1255                 return 20 * us;
1256         case ESCAPE_CLOCK_DIVIDER_2:
1257                 return 10 * us;
1258         case ESCAPE_CLOCK_DIVIDER_4:
1259                 return 5 * us;
1260         }
1261 }
1262
1263 static void set_dsi_timings(struct drm_encoder *encoder,
1264                             const struct drm_display_mode *adjusted_mode)
1265 {
1266         struct drm_device *dev = encoder->dev;
1267         struct drm_i915_private *dev_priv = to_i915(dev);
1268         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1269         enum port port;
1270         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1271         unsigned int lane_count = intel_dsi->lane_count;
1272
1273         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1274
1275         hactive = adjusted_mode->crtc_hdisplay;
1276         hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;
1277         hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
1278         hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;
1279
1280         if (intel_dsi->dual_link) {
1281                 hactive /= 2;
1282                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1283                         hactive += intel_dsi->pixel_overlap;
1284                 hfp /= 2;
1285                 hsync /= 2;
1286                 hbp /= 2;
1287         }
1288
1289         vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;
1290         vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
1291         vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;
1292
1293         /* horizontal values are in terms of high speed byte clock */
1294         hactive = txbyteclkhs(hactive, bpp, lane_count,
1295                               intel_dsi->burst_mode_ratio);
1296         hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1297         hsync = txbyteclkhs(hsync, bpp, lane_count,
1298                             intel_dsi->burst_mode_ratio);
1299         hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1300
1301         for_each_dsi_port(port, intel_dsi->ports) {
1302                 if (IS_GEN9_LP(dev_priv)) {
1303                         /*
1304                          * Program hdisplay and vdisplay on MIPI transcoder.
1305                          * This is different from calculated hactive and
1306                          * vactive, as they are calculated per channel basis,
1307                          * whereas these values should be based on resolution.
1308                          */
1309                         intel_de_write(dev_priv, BXT_MIPI_TRANS_HACTIVE(port),
1310                                        adjusted_mode->crtc_hdisplay);
1311                         intel_de_write(dev_priv, BXT_MIPI_TRANS_VACTIVE(port),
1312                                        adjusted_mode->crtc_vdisplay);
1313                         intel_de_write(dev_priv, BXT_MIPI_TRANS_VTOTAL(port),
1314                                        adjusted_mode->crtc_vtotal);
1315                 }
1316
1317                 intel_de_write(dev_priv, MIPI_HACTIVE_AREA_COUNT(port),
1318                                hactive);
1319                 intel_de_write(dev_priv, MIPI_HFP_COUNT(port), hfp);
1320
1321                 /* meaningful for video mode non-burst sync pulse mode only,
1322                  * can be zero for non-burst sync events and burst modes */
1323                 intel_de_write(dev_priv, MIPI_HSYNC_PADDING_COUNT(port),
1324                                hsync);
1325                 intel_de_write(dev_priv, MIPI_HBP_COUNT(port), hbp);
1326
1327                 /* vertical values are in terms of lines */
1328                 intel_de_write(dev_priv, MIPI_VFP_COUNT(port), vfp);
1329                 intel_de_write(dev_priv, MIPI_VSYNC_PADDING_COUNT(port),
1330                                vsync);
1331                 intel_de_write(dev_priv, MIPI_VBP_COUNT(port), vbp);
1332         }
1333 }
1334
1335 static u32 pixel_format_to_reg(enum mipi_dsi_pixel_format fmt)
1336 {
1337         switch (fmt) {
1338         case MIPI_DSI_FMT_RGB888:
1339                 return VID_MODE_FORMAT_RGB888;
1340         case MIPI_DSI_FMT_RGB666:
1341                 return VID_MODE_FORMAT_RGB666;
1342         case MIPI_DSI_FMT_RGB666_PACKED:
1343                 return VID_MODE_FORMAT_RGB666_PACKED;
1344         case MIPI_DSI_FMT_RGB565:
1345                 return VID_MODE_FORMAT_RGB565;
1346         default:
1347                 MISSING_CASE(fmt);
1348                 return VID_MODE_FORMAT_RGB666;
1349         }
1350 }
1351
1352 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
1353                               const struct intel_crtc_state *pipe_config)
1354 {
1355         struct drm_encoder *encoder = &intel_encoder->base;
1356         struct drm_device *dev = encoder->dev;
1357         struct drm_i915_private *dev_priv = to_i915(dev);
1358         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
1359         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1360         const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
1361         enum port port;
1362         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1363         u32 val, tmp;
1364         u16 mode_hdisplay;
1365
1366         drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(intel_crtc->pipe));
1367
1368         mode_hdisplay = adjusted_mode->crtc_hdisplay;
1369
1370         if (intel_dsi->dual_link) {
1371                 mode_hdisplay /= 2;
1372                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1373                         mode_hdisplay += intel_dsi->pixel_overlap;
1374         }
1375
1376         for_each_dsi_port(port, intel_dsi->ports) {
1377                 if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1378                         /*
1379                          * escape clock divider, 20MHz, shared for A and C.
1380                          * device ready must be off when doing this! txclkesc?
1381                          */
1382                         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
1383                         tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
1384                         intel_de_write(dev_priv, MIPI_CTRL(PORT_A),
1385                                        tmp | ESCAPE_CLOCK_DIVIDER_1);
1386
1387                         /* read request priority is per pipe */
1388                         tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1389                         tmp &= ~READ_REQUEST_PRIORITY_MASK;
1390                         intel_de_write(dev_priv, MIPI_CTRL(port),
1391                                        tmp | READ_REQUEST_PRIORITY_HIGH);
1392                 } else if (IS_GEN9_LP(dev_priv)) {
1393                         enum pipe pipe = intel_crtc->pipe;
1394
1395                         tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1396                         tmp &= ~BXT_PIPE_SELECT_MASK;
1397
1398                         tmp |= BXT_PIPE_SELECT(pipe);
1399                         intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
1400                 }
1401
1402                 /* XXX: why here, why like this? handling in irq handler?! */
1403                 intel_de_write(dev_priv, MIPI_INTR_STAT(port), 0xffffffff);
1404                 intel_de_write(dev_priv, MIPI_INTR_EN(port), 0xffffffff);
1405
1406                 intel_de_write(dev_priv, MIPI_DPHY_PARAM(port),
1407                                intel_dsi->dphy_reg);
1408
1409                 intel_de_write(dev_priv, MIPI_DPI_RESOLUTION(port),
1410                                adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT | mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
1411         }
1412
1413         set_dsi_timings(encoder, adjusted_mode);
1414
1415         val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
1416         if (is_cmd_mode(intel_dsi)) {
1417                 val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
1418                 val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
1419         } else {
1420                 val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
1421                 val |= pixel_format_to_reg(intel_dsi->pixel_format);
1422         }
1423
1424         tmp = 0;
1425         if (intel_dsi->eotp_pkt == 0)
1426                 tmp |= EOT_DISABLE;
1427         if (intel_dsi->clock_stop)
1428                 tmp |= CLOCKSTOP;
1429
1430         if (IS_GEN9_LP(dev_priv)) {
1431                 tmp |= BXT_DPHY_DEFEATURE_EN;
1432                 if (!is_cmd_mode(intel_dsi))
1433                         tmp |= BXT_DEFEATURE_DPI_FIFO_CTR;
1434         }
1435
1436         for_each_dsi_port(port, intel_dsi->ports) {
1437                 intel_de_write(dev_priv, MIPI_DSI_FUNC_PRG(port), val);
1438
1439                 /* timeouts for recovery. one frame IIUC. if counter expires,
1440                  * EOT and stop state. */
1441
1442                 /*
1443                  * In burst mode, value greater than one DPI line Time in byte
1444                  * clock (txbyteclkhs) To timeout this timer 1+ of the above
1445                  * said value is recommended.
1446                  *
1447                  * In non-burst mode, Value greater than one DPI frame time in
1448                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1449                  * said value is recommended.
1450                  *
1451                  * In DBI only mode, value greater than one DBI frame time in
1452                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1453                  * said value is recommended.
1454                  */
1455
1456                 if (is_vid_mode(intel_dsi) &&
1457                         intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
1458                         intel_de_write(dev_priv, MIPI_HS_TX_TIMEOUT(port),
1459                                        txbyteclkhs(adjusted_mode->crtc_htotal, bpp, intel_dsi->lane_count, intel_dsi->burst_mode_ratio) + 1);
1460                 } else {
1461                         intel_de_write(dev_priv, MIPI_HS_TX_TIMEOUT(port),
1462                                        txbyteclkhs(adjusted_mode->crtc_vtotal * adjusted_mode->crtc_htotal, bpp, intel_dsi->lane_count, intel_dsi->burst_mode_ratio) + 1);
1463                 }
1464                 intel_de_write(dev_priv, MIPI_LP_RX_TIMEOUT(port),
1465                                intel_dsi->lp_rx_timeout);
1466                 intel_de_write(dev_priv, MIPI_TURN_AROUND_TIMEOUT(port),
1467                                intel_dsi->turn_arnd_val);
1468                 intel_de_write(dev_priv, MIPI_DEVICE_RESET_TIMER(port),
1469                                intel_dsi->rst_timer_val);
1470
1471                 /* dphy stuff */
1472
1473                 /* in terms of low power clock */
1474                 intel_de_write(dev_priv, MIPI_INIT_COUNT(port),
1475                                txclkesc(intel_dsi->escape_clk_div, 100));
1476
1477                 if (IS_GEN9_LP(dev_priv) && (!intel_dsi->dual_link)) {
1478                         /*
1479                          * BXT spec says write MIPI_INIT_COUNT for
1480                          * both the ports, even if only one is
1481                          * getting used. So write the other port
1482                          * if not in dual link mode.
1483                          */
1484                         intel_de_write(dev_priv,
1485                                        MIPI_INIT_COUNT(port == PORT_A ? PORT_C : PORT_A),
1486                                        intel_dsi->init_count);
1487                 }
1488
1489                 /* recovery disables */
1490                 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), tmp);
1491
1492                 /* in terms of low power clock */
1493                 intel_de_write(dev_priv, MIPI_INIT_COUNT(port),
1494                                intel_dsi->init_count);
1495
1496                 /* in terms of txbyteclkhs. actual high to low switch +
1497                  * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
1498                  *
1499                  * XXX: write MIPI_STOP_STATE_STALL?
1500                  */
1501                 intel_de_write(dev_priv, MIPI_HIGH_LOW_SWITCH_COUNT(port),
1502                                intel_dsi->hs_to_lp_count);
1503
1504                 /* XXX: low power clock equivalence in terms of byte clock.
1505                  * the number of byte clocks occupied in one low power clock.
1506                  * based on txbyteclkhs and txclkesc.
1507                  * txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
1508                  * ) / 105.???
1509                  */
1510                 intel_de_write(dev_priv, MIPI_LP_BYTECLK(port),
1511                                intel_dsi->lp_byte_clk);
1512
1513                 if (IS_GEMINILAKE(dev_priv)) {
1514                         intel_de_write(dev_priv, MIPI_TLPX_TIME_COUNT(port),
1515                                        intel_dsi->lp_byte_clk);
1516                         /* Shadow of DPHY reg */
1517                         intel_de_write(dev_priv, MIPI_CLK_LANE_TIMING(port),
1518                                        intel_dsi->dphy_reg);
1519                 }
1520
1521                 /* the bw essential for transmitting 16 long packets containing
1522                  * 252 bytes meant for dcs write memory command is programmed in
1523                  * this register in terms of byte clocks. based on dsi transfer
1524                  * rate and the number of lanes configured the time taken to
1525                  * transmit 16 long packets in a dsi stream varies. */
1526                 intel_de_write(dev_priv, MIPI_DBI_BW_CTRL(port),
1527                                intel_dsi->bw_timer);
1528
1529                 intel_de_write(dev_priv, MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
1530                                intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT | intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
1531
1532                 if (is_vid_mode(intel_dsi))
1533                         /* Some panels might have resolution which is not a
1534                          * multiple of 64 like 1366 x 768. Enable RANDOM
1535                          * resolution support for such panels by default */
1536                         intel_de_write(dev_priv, MIPI_VIDEO_MODE_FORMAT(port),
1537                                        intel_dsi->video_frmt_cfg_bits | intel_dsi->video_mode_format | IP_TG_CONFIG | RANDOM_DPI_DISPLAY_RESOLUTION);
1538         }
1539 }
1540
1541 static void intel_dsi_unprepare(struct intel_encoder *encoder)
1542 {
1543         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1544         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1545         enum port port;
1546         u32 val;
1547
1548         if (IS_GEMINILAKE(dev_priv))
1549                 return;
1550
1551         for_each_dsi_port(port, intel_dsi->ports) {
1552                 /* Panel commands can be sent when clock is in LP11 */
1553                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x0);
1554
1555                 if (IS_GEN9_LP(dev_priv))
1556                         bxt_dsi_reset_clocks(encoder, port);
1557                 else
1558                         vlv_dsi_reset_clocks(encoder, port);
1559                 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);
1560
1561                 val = intel_de_read(dev_priv, MIPI_DSI_FUNC_PRG(port));
1562                 val &= ~VID_MODE_FORMAT_MASK;
1563                 intel_de_write(dev_priv, MIPI_DSI_FUNC_PRG(port), val);
1564
1565                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x1);
1566         }
1567 }
1568
1569 static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
1570 {
1571         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1572
1573         intel_dsi_vbt_gpio_cleanup(intel_dsi);
1574         intel_encoder_destroy(encoder);
1575 }
1576
1577 static const struct drm_encoder_funcs intel_dsi_funcs = {
1578         .destroy = intel_dsi_encoder_destroy,
1579 };
1580
1581 static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
1582         .get_modes = intel_dsi_get_modes,
1583         .mode_valid = intel_dsi_mode_valid,
1584         .atomic_check = intel_digital_connector_atomic_check,
1585 };
1586
1587 static const struct drm_connector_funcs intel_dsi_connector_funcs = {
1588         .late_register = intel_connector_register,
1589         .early_unregister = intel_connector_unregister,
1590         .destroy = intel_connector_destroy,
1591         .fill_modes = drm_helper_probe_single_connector_modes,
1592         .atomic_get_property = intel_digital_connector_atomic_get_property,
1593         .atomic_set_property = intel_digital_connector_atomic_set_property,
1594         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1595         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
1596 };
1597
1598 static void vlv_dsi_add_properties(struct intel_connector *connector)
1599 {
1600         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1601
1602         if (connector->panel.fixed_mode) {
1603                 u32 allowed_scalers;
1604
1605                 allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT) | BIT(DRM_MODE_SCALE_FULLSCREEN);
1606                 if (!HAS_GMCH(dev_priv))
1607                         allowed_scalers |= BIT(DRM_MODE_SCALE_CENTER);
1608
1609                 drm_connector_attach_scaling_mode_property(&connector->base,
1610                                                                 allowed_scalers);
1611
1612                 connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
1613
1614                 drm_connector_set_panel_orientation_with_quirk(
1615                                 &connector->base,
1616                                 intel_dsi_get_panel_orientation(connector),
1617                                 connector->panel.fixed_mode->hdisplay,
1618                                 connector->panel.fixed_mode->vdisplay);
1619         }
1620 }
1621
1622 #define NS_KHZ_RATIO            1000000
1623
1624 #define PREPARE_CNT_MAX         0x3F
1625 #define EXIT_ZERO_CNT_MAX       0x3F
1626 #define CLK_ZERO_CNT_MAX        0xFF
1627 #define TRAIL_CNT_MAX           0x1F
1628
1629 static void vlv_dphy_param_init(struct intel_dsi *intel_dsi)
1630 {
1631         struct drm_device *dev = intel_dsi->base.base.dev;
1632         struct drm_i915_private *dev_priv = to_i915(dev);
1633         struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
1634         u32 tlpx_ns, extra_byte_count, tlpx_ui;
1635         u32 ui_num, ui_den;
1636         u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
1637         u32 ths_prepare_ns, tclk_trail_ns;
1638         u32 tclk_prepare_clkzero, ths_prepare_hszero;
1639         u32 lp_to_hs_switch, hs_to_lp_switch;
1640         u32 mul;
1641
1642         tlpx_ns = intel_dsi_tlpx_ns(intel_dsi);
1643
1644         switch (intel_dsi->lane_count) {
1645         case 1:
1646         case 2:
1647                 extra_byte_count = 2;
1648                 break;
1649         case 3:
1650                 extra_byte_count = 4;
1651                 break;
1652         case 4:
1653         default:
1654                 extra_byte_count = 3;
1655                 break;
1656         }
1657
1658         /* in Kbps */
1659         ui_num = NS_KHZ_RATIO;
1660         ui_den = intel_dsi_bitrate(intel_dsi);
1661
1662         tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
1663         ths_prepare_hszero = mipi_config->ths_prepare_hszero;
1664
1665         /*
1666          * B060
1667          * LP byte clock = TLPX/ (8UI)
1668          */
1669         intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
1670
1671         /* DDR clock period = 2 * UI
1672          * UI(sec) = 1/(bitrate * 10^3) (bitrate is in KHZ)
1673          * UI(nsec) = 10^6 / bitrate
1674          * DDR clock period (nsec) = 2 * UI = (2 * 10^6)/ bitrate
1675          * DDR clock count  = ns_value / DDR clock period
1676          *
1677          * For GEMINILAKE dphy_param_reg will be programmed in terms of
1678          * HS byte clock count for other platform in HS ddr clock count
1679          */
1680         mul = IS_GEMINILAKE(dev_priv) ? 8 : 2;
1681         ths_prepare_ns = max(mipi_config->ths_prepare,
1682                              mipi_config->tclk_prepare);
1683
1684         /* prepare count */
1685         prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
1686
1687         if (prepare_cnt > PREPARE_CNT_MAX) {
1688                 drm_dbg_kms(&dev_priv->drm, "prepare count too high %u\n",
1689                             prepare_cnt);
1690                 prepare_cnt = PREPARE_CNT_MAX;
1691         }
1692
1693         /* exit zero count */
1694         exit_zero_cnt = DIV_ROUND_UP(
1695                                 (ths_prepare_hszero - ths_prepare_ns) * ui_den,
1696                                 ui_num * mul
1697                                 );
1698
1699         /*
1700          * Exit zero is unified val ths_zero and ths_exit
1701          * minimum value for ths_exit = 110ns
1702          * min (exit_zero_cnt * 2) = 110/UI
1703          * exit_zero_cnt = 55/UI
1704          */
1705         if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num)
1706                 exit_zero_cnt += 1;
1707
1708         if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
1709                 drm_dbg_kms(&dev_priv->drm, "exit zero count too high %u\n",
1710                             exit_zero_cnt);
1711                 exit_zero_cnt = EXIT_ZERO_CNT_MAX;
1712         }
1713
1714         /* clk zero count */
1715         clk_zero_cnt = DIV_ROUND_UP(
1716                                 (tclk_prepare_clkzero - ths_prepare_ns)
1717                                 * ui_den, ui_num * mul);
1718
1719         if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
1720                 drm_dbg_kms(&dev_priv->drm, "clock zero count too high %u\n",
1721                             clk_zero_cnt);
1722                 clk_zero_cnt = CLK_ZERO_CNT_MAX;
1723         }
1724
1725         /* trail count */
1726         tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
1727         trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
1728
1729         if (trail_cnt > TRAIL_CNT_MAX) {
1730                 drm_dbg_kms(&dev_priv->drm, "trail count too high %u\n",
1731                             trail_cnt);
1732                 trail_cnt = TRAIL_CNT_MAX;
1733         }
1734
1735         /* B080 */
1736         intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
1737                                                 clk_zero_cnt << 8 | prepare_cnt;
1738
1739         /*
1740          * LP to HS switch count = 4TLPX + PREP_COUNT * mul + EXIT_ZERO_COUNT *
1741          *                                      mul + 10UI + Extra Byte Count
1742          *
1743          * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count
1744          * Extra Byte Count is calculated according to number of lanes.
1745          * High Low Switch Count is the Max of LP to HS and
1746          * HS to LP switch count
1747          *
1748          */
1749         tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
1750
1751         /* B044 */
1752         /* FIXME:
1753          * The comment above does not match with the code */
1754         lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * mul +
1755                                                 exit_zero_cnt * mul + 10, 8);
1756
1757         hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8);
1758
1759         intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
1760         intel_dsi->hs_to_lp_count += extra_byte_count;
1761
1762         /* B088 */
1763         /* LP -> HS for clock lanes
1764          * LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
1765          *                                              extra byte count
1766          * 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
1767          *                                      2(in UI) + extra byte count
1768          * In byteclks = (4TLPX + prepare_cnt * 2 + clk_zero_cnt *2 (in UI)) /
1769          *                                      8 + extra byte count
1770          */
1771         intel_dsi->clk_lp_to_hs_count =
1772                 DIV_ROUND_UP(
1773                         4 * tlpx_ui + prepare_cnt * 2 +
1774                         clk_zero_cnt * 2,
1775                         8);
1776
1777         intel_dsi->clk_lp_to_hs_count += extra_byte_count;
1778
1779         /* HS->LP for Clock Lanes
1780          * Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
1781          *                                              Extra byte count
1782          * 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
1783          * In byteclks = (2*TLpx(in UI) + trail_count*2 +8)(in UI)/8 +
1784          *                                              Extra byte count
1785          */
1786         intel_dsi->clk_hs_to_lp_count =
1787                 DIV_ROUND_UP(2 * tlpx_ui + trail_cnt * 2 + 8,
1788                         8);
1789         intel_dsi->clk_hs_to_lp_count += extra_byte_count;
1790
1791         intel_dsi_log_params(intel_dsi);
1792 }
1793
1794 void vlv_dsi_init(struct drm_i915_private *dev_priv)
1795 {
1796         struct drm_device *dev = &dev_priv->drm;
1797         struct intel_dsi *intel_dsi;
1798         struct intel_encoder *intel_encoder;
1799         struct drm_encoder *encoder;
1800         struct intel_connector *intel_connector;
1801         struct drm_connector *connector;
1802         struct drm_display_mode *current_mode, *fixed_mode;
1803         enum port port;
1804         enum pipe pipe;
1805
1806         drm_dbg_kms(&dev_priv->drm, "\n");
1807
1808         /* There is no detection method for MIPI so rely on VBT */
1809         if (!intel_bios_is_dsi_present(dev_priv, &port))
1810                 return;
1811
1812         if (IS_GEN9_LP(dev_priv))
1813                 dev_priv->mipi_mmio_base = BXT_MIPI_BASE;
1814         else
1815                 dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
1816
1817         intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
1818         if (!intel_dsi)
1819                 return;
1820
1821         intel_connector = intel_connector_alloc();
1822         if (!intel_connector) {
1823                 kfree(intel_dsi);
1824                 return;
1825         }
1826
1827         intel_encoder = &intel_dsi->base;
1828         encoder = &intel_encoder->base;
1829         intel_dsi->attached_connector = intel_connector;
1830
1831         connector = &intel_connector->base;
1832
1833         drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI,
1834                          "DSI %c", port_name(port));
1835
1836         intel_encoder->compute_config = intel_dsi_compute_config;
1837         intel_encoder->pre_enable = intel_dsi_pre_enable;
1838         if (IS_GEN9_LP(dev_priv))
1839                 intel_encoder->enable = bxt_dsi_enable;
1840         intel_encoder->disable = intel_dsi_disable;
1841         intel_encoder->post_disable = intel_dsi_post_disable;
1842         intel_encoder->get_hw_state = intel_dsi_get_hw_state;
1843         intel_encoder->get_config = intel_dsi_get_config;
1844         intel_encoder->update_pipe = intel_panel_update_backlight;
1845
1846         intel_connector->get_hw_state = intel_connector_get_hw_state;
1847
1848         intel_encoder->port = port;
1849         intel_encoder->type = INTEL_OUTPUT_DSI;
1850         intel_encoder->power_domain = POWER_DOMAIN_PORT_DSI;
1851         intel_encoder->cloneable = 0;
1852
1853         /*
1854          * On BYT/CHV, pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI
1855          * port C. BXT isn't limited like this.
1856          */
1857         if (IS_GEN9_LP(dev_priv))
1858                 intel_encoder->pipe_mask = ~0;
1859         else if (port == PORT_A)
1860                 intel_encoder->pipe_mask = BIT(PIPE_A);
1861         else
1862                 intel_encoder->pipe_mask = BIT(PIPE_B);
1863
1864         if (dev_priv->vbt.dsi.config->dual_link)
1865                 intel_dsi->ports = BIT(PORT_A) | BIT(PORT_C);
1866         else
1867                 intel_dsi->ports = BIT(port);
1868
1869         intel_dsi->dcs_backlight_ports = dev_priv->vbt.dsi.bl_ports;
1870         intel_dsi->dcs_cabc_ports = dev_priv->vbt.dsi.cabc_ports;
1871
1872         /* Create a DSI host (and a device) for each port. */
1873         for_each_dsi_port(port, intel_dsi->ports) {
1874                 struct intel_dsi_host *host;
1875
1876                 host = intel_dsi_host_init(intel_dsi, &intel_dsi_host_ops,
1877                                            port);
1878                 if (!host)
1879                         goto err;
1880
1881                 intel_dsi->dsi_hosts[port] = host;
1882         }
1883
1884         if (!intel_dsi_vbt_init(intel_dsi, MIPI_DSI_GENERIC_PANEL_ID)) {
1885                 drm_dbg_kms(&dev_priv->drm, "no device found\n");
1886                 goto err;
1887         }
1888
1889         /* Use clock read-back from current hw-state for fastboot */
1890         current_mode = intel_encoder_current_mode(intel_encoder);
1891         if (current_mode) {
1892                 drm_dbg_kms(&dev_priv->drm, "Calculated pclk %d GOP %d\n",
1893                             intel_dsi->pclk, current_mode->clock);
1894                 if (intel_fuzzy_clock_check(intel_dsi->pclk,
1895                                             current_mode->clock)) {
1896                         drm_dbg_kms(&dev_priv->drm, "Using GOP pclk\n");
1897                         intel_dsi->pclk = current_mode->clock;
1898                 }
1899
1900                 kfree(current_mode);
1901         }
1902
1903         vlv_dphy_param_init(intel_dsi);
1904
1905         intel_dsi_vbt_gpio_init(intel_dsi,
1906                                 intel_dsi_get_hw_state(intel_encoder, &pipe));
1907
1908         drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
1909                            DRM_MODE_CONNECTOR_DSI);
1910
1911         drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
1912
1913         connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
1914         connector->interlace_allowed = false;
1915         connector->doublescan_allowed = false;
1916
1917         intel_connector_attach_encoder(intel_connector, intel_encoder);
1918
1919         mutex_lock(&dev->mode_config.mutex);
1920         fixed_mode = intel_panel_vbt_fixed_mode(intel_connector);
1921         mutex_unlock(&dev->mode_config.mutex);
1922
1923         if (!fixed_mode) {
1924                 drm_dbg_kms(&dev_priv->drm, "no fixed mode\n");
1925                 goto err_cleanup_connector;
1926         }
1927
1928         intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
1929         intel_panel_setup_backlight(connector, INVALID_PIPE);
1930
1931         vlv_dsi_add_properties(intel_connector);
1932
1933         return;
1934
1935 err_cleanup_connector:
1936         drm_connector_cleanup(&intel_connector->base);
1937 err:
1938         drm_encoder_cleanup(&intel_encoder->base);
1939         kfree(intel_dsi);
1940         kfree(intel_connector);
1941 }