drivers/gpu/drm/sun4i/sun4i_tcon.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2015 Free Electrons
   4  * Copyright (C) 2015 NextThing Co
   5  *
   6  * Maxime Ripard <maxime.ripard@free-electrons.com>
   7  */
   8
   9 #include <linux/component.h>
  10 #include <linux/ioport.h>
  11 #include <linux/module.h>
  12 #include <linux/of_address.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/regmap.h>
  16 #include <linux/reset.h>
  17
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_bridge.h>
  20 #include <drm/drm_connector.h>
  21 #include <drm/drm_crtc.h>
  22 #include <drm/drm_encoder.h>
  23 #include <drm/drm_modes.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_panel.h>
  26 #include <drm/drm_print.h>
  27 #include <drm/drm_probe_helper.h>
  28 #include <drm/drm_vblank.h>
  29
  30 #include <uapi/drm/drm_mode.h>
  31
  32 #include "sun4i_crtc.h"
  33 #include "sun4i_dotclock.h"
  34 #include "sun4i_drv.h"
  35 #include "sun4i_lvds.h"
  36 #include "sun4i_rgb.h"
  37 #include "sun4i_tcon.h"
  38 #include "sun6i_mipi_dsi.h"
  39 #include "sun8i_tcon_top.h"
  40 #include "sunxi_engine.h"
  41
  42 static struct drm_connector *sun4i_tcon_get_connector(const struct drm_encoder *encoder)
  43 {
  44         struct drm_connector *connector;
  45         struct drm_connector_list_iter iter;
  46
  47         drm_connector_list_iter_begin(encoder->dev, &iter);
  48         drm_for_each_connector_iter(connector, &iter)
  49                 if (connector->encoder == encoder) {
  50                         drm_connector_list_iter_end(&iter);
  51                         return connector;
  52                 }
  53         drm_connector_list_iter_end(&iter);
  54
  55         return NULL;
  56 }
  57
  58 static int sun4i_tcon_get_pixel_depth(const struct drm_encoder *encoder)
  59 {
  60         struct drm_connector *connector;
  61         struct drm_display_info *info;
  62
  63         connector = sun4i_tcon_get_connector(encoder);
  64         if (!connector)
  65                 return -EINVAL;
  66
  67         info = &connector->display_info;
  68         if (info->num_bus_formats != 1)
  69                 return -EINVAL;
  70
  71         switch (info->bus_formats[0]) {
  72         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
  73                 return 18;
  74
  75         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
  76         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
  77                 return 24;
  78         }
  79
  80         return -EINVAL;
  81 }
  82
  83 static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel,
  84                                           bool enabled)
  85 {
  86         struct clk *clk;
  87
  88         switch (channel) {
  89         case 0:
  90                 WARN_ON(!tcon->quirks->has_channel_0);
  91                 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
  92                                    SUN4I_TCON0_CTL_TCON_ENABLE,
  93                                    enabled ? SUN4I_TCON0_CTL_TCON_ENABLE : 0);
  94                 clk = tcon->dclk;
  95                 break;
  96         case 1:
  97                 WARN_ON(!tcon->quirks->has_channel_1);
  98                 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
  99                                    SUN4I_TCON1_CTL_TCON_ENABLE,
 100                                    enabled ? SUN4I_TCON1_CTL_TCON_ENABLE : 0);
 101                 clk = tcon->sclk1;
 102                 break;
 103         default:
 104                 DRM_WARN("Unknown channel... doing nothing\n");
 105                 return;
 106         }
 107
 108         if (enabled) {
 109                 clk_prepare_enable(clk);
 110                 clk_rate_exclusive_get(clk);
 111         } else {
 112                 clk_rate_exclusive_put(clk);
 113                 clk_disable_unprepare(clk);
 114         }
 115 }
 116
 117 static void sun4i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
 118                                       const struct drm_encoder *encoder)
 119 {
 120         regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 121                      SUN4I_TCON0_LVDS_ANA0_CK_EN |
 122                      SUN4I_TCON0_LVDS_ANA0_REG_V |
 123                      SUN4I_TCON0_LVDS_ANA0_REG_C |
 124                      SUN4I_TCON0_LVDS_ANA0_EN_MB |
 125                      SUN4I_TCON0_LVDS_ANA0_PD |
 126                      SUN4I_TCON0_LVDS_ANA0_DCHS);
 127
 128         udelay(2); /* delay at least 1200 ns */
 129         regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
 130                            SUN4I_TCON0_LVDS_ANA1_INIT,
 131                            SUN4I_TCON0_LVDS_ANA1_INIT);
 132         udelay(1); /* delay at least 120 ns */
 133         regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA1_REG,
 134                            SUN4I_TCON0_LVDS_ANA1_UPDATE,
 135                            SUN4I_TCON0_LVDS_ANA1_UPDATE);
 136         regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 137                            SUN4I_TCON0_LVDS_ANA0_EN_MB,
 138                            SUN4I_TCON0_LVDS_ANA0_EN_MB);
 139 }
 140
 141 static void sun6i_tcon_setup_lvds_phy(struct sun4i_tcon *tcon,
 142                                       const struct drm_encoder *encoder)
 143 {
 144         u8 val;
 145
 146         regmap_write(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 147                      SUN6I_TCON0_LVDS_ANA0_C(2) |
 148                      SUN6I_TCON0_LVDS_ANA0_V(3) |
 149                      SUN6I_TCON0_LVDS_ANA0_PD(2) |
 150                      SUN6I_TCON0_LVDS_ANA0_EN_LDO);
 151         udelay(2);
 152
 153         regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 154                            SUN6I_TCON0_LVDS_ANA0_EN_MB,
 155                            SUN6I_TCON0_LVDS_ANA0_EN_MB);
 156         udelay(2);
 157
 158         regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 159                            SUN6I_TCON0_LVDS_ANA0_EN_DRVC,
 160                            SUN6I_TCON0_LVDS_ANA0_EN_DRVC);
 161
 162         if (sun4i_tcon_get_pixel_depth(encoder) == 18)
 163                 val = 7;
 164         else
 165                 val = 0xf;
 166
 167         regmap_write_bits(tcon->regs, SUN4I_TCON0_LVDS_ANA0_REG,
 168                           SUN6I_TCON0_LVDS_ANA0_EN_DRVD(0xf),
 169                           SUN6I_TCON0_LVDS_ANA0_EN_DRVD(val));
 170 }
 171
 172 static void sun4i_tcon_lvds_set_status(struct sun4i_tcon *tcon,
 173                                        const struct drm_encoder *encoder,
 174                                        bool enabled)
 175 {
 176         if (enabled) {
 177                 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG,
 178                                    SUN4I_TCON0_LVDS_IF_EN,
 179                                    SUN4I_TCON0_LVDS_IF_EN);
 180                 if (tcon->quirks->setup_lvds_phy)
 181                         tcon->quirks->setup_lvds_phy(tcon, encoder);
 182         } else {
 183                 regmap_update_bits(tcon->regs, SUN4I_TCON0_LVDS_IF_REG,
 184                                    SUN4I_TCON0_LVDS_IF_EN, 0);
 185         }
 186 }
 187
 188 void sun4i_tcon_set_status(struct sun4i_tcon *tcon,
 189                            const struct drm_encoder *encoder,
 190                            bool enabled)
 191 {
 192         bool is_lvds = false;
 193         int channel;
 194
 195         switch (encoder->encoder_type) {
 196         case DRM_MODE_ENCODER_LVDS:
 197                 is_lvds = true;
 198                 fallthrough;
 199         case DRM_MODE_ENCODER_DSI:
 200         case DRM_MODE_ENCODER_NONE:
 201                 channel = 0;
 202                 break;
 203         case DRM_MODE_ENCODER_TMDS:
 204         case DRM_MODE_ENCODER_TVDAC:
 205                 channel = 1;
 206                 break;
 207         default:
 208                 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
 209                 return;
 210         }
 211
 212         if (is_lvds && !enabled)
 213                 sun4i_tcon_lvds_set_status(tcon, encoder, false);
 214
 215         regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
 216                            SUN4I_TCON_GCTL_TCON_ENABLE,
 217                            enabled ? SUN4I_TCON_GCTL_TCON_ENABLE : 0);
 218
 219         if (is_lvds && enabled)
 220                 sun4i_tcon_lvds_set_status(tcon, encoder, true);
 221
 222         sun4i_tcon_channel_set_status(tcon, channel, enabled);
 223 }
 224
 225 void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
 226 {
 227         u32 mask, val = 0;
 228
 229         DRM_DEBUG_DRIVER("%sabling VBLANK interrupt\n", enable ? "En" : "Dis");
 230
 231         mask = SUN4I_TCON_GINT0_VBLANK_ENABLE(0) |
 232                 SUN4I_TCON_GINT0_VBLANK_ENABLE(1) |
 233                 SUN4I_TCON_GINT0_TCON0_TRI_FINISH_ENABLE;
 234
 235         if (enable)
 236                 val = mask;
 237
 238         regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG, mask, val);
 239 }
 240 EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
 241
 242 /*
 243  * This function is a helper for TCON output muxing. The TCON output
 244  * muxing control register in earlier SoCs (without the TCON TOP block)
 245  * are located in TCON0. This helper returns a pointer to TCON0's
 246  * sun4i_tcon structure, or NULL if not found.
 247  */
 248 static struct sun4i_tcon *sun4i_get_tcon0(struct drm_device *drm)
 249 {
 250         struct sun4i_drv *drv = drm->dev_private;
 251         struct sun4i_tcon *tcon;
 252
 253         list_for_each_entry(tcon, &drv->tcon_list, list)
 254                 if (tcon->id == 0)
 255                         return tcon;
 256
 257         dev_warn(drm->dev,
 258                  "TCON0 not found, display output muxing may not work\n");
 259
 260         return NULL;
 261 }
 262
 263 static void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
 264                                const struct drm_encoder *encoder)
 265 {
 266         int ret = -ENOTSUPP;
 267
 268         if (tcon->quirks->set_mux)
 269                 ret = tcon->quirks->set_mux(tcon, encoder);
 270
 271         DRM_DEBUG_DRIVER("Muxing encoder %s to CRTC %s: %d\n",
 272                          encoder->name, encoder->crtc->name, ret);
 273 }
 274
 275 static int sun4i_tcon_get_clk_delay(const struct drm_display_mode *mode,
 276                                     int channel)
 277 {
 278         int delay = mode->vtotal - mode->vdisplay;
 279
 280         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 281                 delay /= 2;
 282
 283         if (channel == 1)
 284                 delay -= 2;
 285
 286         delay = min(delay, 30);
 287
 288         DRM_DEBUG_DRIVER("TCON %d clock delay %u\n", channel, delay);
 289
 290         return delay;
 291 }
 292
 293 static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon,
 294                                         const struct drm_display_mode *mode)
 295 {
 296         /* Configure the dot clock */
 297         clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
 298
 299         /* Set the resolution */
 300         regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
 301                      SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) |
 302                      SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay));
 303 }
 304
 305 static void sun4i_tcon0_mode_set_dithering(struct sun4i_tcon *tcon,
 306                                            const struct drm_connector *connector)
 307 {
 308         u32 bus_format = 0;
 309         u32 val = 0;
 310
 311         /* XXX Would this ever happen? */
 312         if (!connector)
 313                 return;
 314
 315         /*
 316          * FIXME: Undocumented bits
 317          *
 318          * The whole dithering process and these parameters are not
 319          * explained in the vendor documents or BSP kernel code.
 320          */
 321         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PR_REG, 0x11111111);
 322         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PG_REG, 0x11111111);
 323         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_PB_REG, 0x11111111);
 324         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LR_REG, 0x11111111);
 325         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LG_REG, 0x11111111);
 326         regmap_write(tcon->regs, SUN4I_TCON0_FRM_SEED_LB_REG, 0x11111111);
 327         regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL0_REG, 0x01010000);
 328         regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL1_REG, 0x15151111);
 329         regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL2_REG, 0x57575555);
 330         regmap_write(tcon->regs, SUN4I_TCON0_FRM_TBL3_REG, 0x7f7f7777);
 331
 332         /* Do dithering if panel only supports 6 bits per color */
 333         if (connector->display_info.bpc == 6)
 334                 val |= SUN4I_TCON0_FRM_CTL_EN;
 335
 336         if (connector->display_info.num_bus_formats == 1)
 337                 bus_format = connector->display_info.bus_formats[0];
 338
 339         /* Check the connection format */
 340         switch (bus_format) {
 341         case MEDIA_BUS_FMT_RGB565_1X16:
 342                 /* R and B components are only 5 bits deep */
 343                 val |= SUN4I_TCON0_FRM_CTL_MODE_R;
 344                 val |= SUN4I_TCON0_FRM_CTL_MODE_B;
 345                 fallthrough;
 346         case MEDIA_BUS_FMT_RGB666_1X18:
 347         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 348                 /* Fall through: enable dithering */
 349                 val |= SUN4I_TCON0_FRM_CTL_EN;
 350                 break;
 351         }
 352
 353         /* Write dithering settings */
 354         regmap_write(tcon->regs, SUN4I_TCON_FRM_CTL_REG, val);
 355 }
 356
 357 static void sun4i_tcon0_mode_set_cpu(struct sun4i_tcon *tcon,
 358                                      const struct drm_encoder *encoder,
 359                                      const struct drm_display_mode *mode)
 360 {
 361         /* TODO support normal CPU interface modes */
 362         struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
 363         struct mipi_dsi_device *device = dsi->device;
 364         u8 bpp = mipi_dsi_pixel_format_to_bpp(device->format);
 365         u8 lanes = device->lanes;
 366         u32 block_space, start_delay;
 367         u32 tcon_div;
 368
 369         tcon->dclk_min_div = SUN6I_DSI_TCON_DIV;
 370         tcon->dclk_max_div = SUN6I_DSI_TCON_DIV;
 371
 372         sun4i_tcon0_mode_set_common(tcon, mode);
 373
 374         /* Set dithering if needed */
 375         sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder));
 376
 377         regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
 378                            SUN4I_TCON0_CTL_IF_MASK,
 379                            SUN4I_TCON0_CTL_IF_8080);
 380
 381         regmap_write(tcon->regs, SUN4I_TCON_ECC_FIFO_REG,
 382                      SUN4I_TCON_ECC_FIFO_EN);
 383
 384         regmap_write(tcon->regs, SUN4I_TCON0_CPU_IF_REG,
 385                      SUN4I_TCON0_CPU_IF_MODE_DSI |
 386                      SUN4I_TCON0_CPU_IF_TRI_FIFO_FLUSH |
 387                      SUN4I_TCON0_CPU_IF_TRI_FIFO_EN |
 388                      SUN4I_TCON0_CPU_IF_TRI_EN);
 389
 390         /*
 391          * This looks suspicious, but it works...
 392          *
 393          * The datasheet says that this should be set higher than 20 *
 394          * pixel cycle, but it's not clear what a pixel cycle is.
 395          */
 396         regmap_read(tcon->regs, SUN4I_TCON0_DCLK_REG, &tcon_div);
 397         tcon_div &= GENMASK(6, 0);
 398         block_space = mode->htotal * bpp / (tcon_div * lanes);
 399         block_space -= mode->hdisplay + 40;
 400
 401         regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI0_REG,
 402                      SUN4I_TCON0_CPU_TRI0_BLOCK_SPACE(block_space) |
 403                      SUN4I_TCON0_CPU_TRI0_BLOCK_SIZE(mode->hdisplay));
 404
 405         regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI1_REG,
 406                      SUN4I_TCON0_CPU_TRI1_BLOCK_NUM(mode->vdisplay));
 407
 408         start_delay = (mode->crtc_vtotal - mode->crtc_vdisplay - 10 - 1);
 409         start_delay = start_delay * mode->crtc_htotal * 149;
 410         start_delay = start_delay / (mode->crtc_clock / 1000) / 8;
 411         regmap_write(tcon->regs, SUN4I_TCON0_CPU_TRI2_REG,
 412                      SUN4I_TCON0_CPU_TRI2_TRANS_START_SET(10) |
 413                      SUN4I_TCON0_CPU_TRI2_START_DELAY(start_delay));
 414
 415         /*
 416          * The Allwinner BSP has a comment that the period should be
 417          * the display clock * 15, but uses an hardcoded 3000...
 418          */
 419         regmap_write(tcon->regs, SUN4I_TCON_SAFE_PERIOD_REG,
 420                      SUN4I_TCON_SAFE_PERIOD_NUM(3000) |
 421                      SUN4I_TCON_SAFE_PERIOD_MODE(3));
 422
 423         /* Enable the output on the pins */
 424         regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG,
 425                      0xe0000000);
 426 }
 427
 428 static void sun4i_tcon0_mode_set_lvds(struct sun4i_tcon *tcon,
 429                                       const struct drm_encoder *encoder,
 430                                       const struct drm_display_mode *mode)
 431 {
 432         unsigned int bp;
 433         u8 clk_delay;
 434         u32 reg, val = 0;
 435
 436         WARN_ON(!tcon->quirks->has_channel_0);
 437
 438         tcon->dclk_min_div = 7;
 439         tcon->dclk_max_div = 7;
 440         sun4i_tcon0_mode_set_common(tcon, mode);
 441
 442         /* Set dithering if needed */
 443         sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder));
 444
 445         /* Adjust clock delay */
 446         clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
 447         regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
 448                            SUN4I_TCON0_CTL_CLK_DELAY_MASK,
 449                            SUN4I_TCON0_CTL_CLK_DELAY(clk_delay));
 450
 451         /*
 452          * This is called a backporch in the register documentation,
 453          * but it really is the back porch + hsync
 454          */
 455         bp = mode->crtc_htotal - mode->crtc_hsync_start;
 456         DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
 457                          mode->crtc_htotal, bp);
 458
 459         /* Set horizontal display timings */
 460         regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG,
 461                      SUN4I_TCON0_BASIC1_H_TOTAL(mode->htotal) |
 462                      SUN4I_TCON0_BASIC1_H_BACKPORCH(bp));
 463
 464         /*
 465          * This is called a backporch in the register documentation,
 466          * but it really is the back porch + hsync
 467          */
 468         bp = mode->crtc_vtotal - mode->crtc_vsync_start;
 469         DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
 470                          mode->crtc_vtotal, bp);
 471
 472         /* Set vertical display timings */
 473         regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG,
 474                      SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
 475                      SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
 476
 477         reg = SUN4I_TCON0_LVDS_IF_CLK_SEL_TCON0;
 478         if (sun4i_tcon_get_pixel_depth(encoder) == 24)
 479                 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_24BITS;
 480         else
 481                 reg |= SUN4I_TCON0_LVDS_IF_BITWIDTH_18BITS;
 482
 483         regmap_write(tcon->regs, SUN4I_TCON0_LVDS_IF_REG, reg);
 484
 485         /* Setup the polarity of the various signals */
 486         if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
 487                 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
 488
 489         if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
 490                 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
 491
 492         regmap_write(tcon->regs, SUN4I_TCON0_IO_POL_REG, val);
 493
 494         /* Map output pins to channel 0 */
 495         regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
 496                            SUN4I_TCON_GCTL_IOMAP_MASK,
 497                            SUN4I_TCON_GCTL_IOMAP_TCON0);
 498
 499         /* Enable the output on the pins */
 500         regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0xe0000000);
 501 }
 502
 503 static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
 504                                      const struct drm_encoder *encoder,
 505                                      const struct drm_display_mode *mode)
 506 {
 507         struct drm_connector *connector = sun4i_tcon_get_connector(encoder);
 508         const struct drm_display_info *info = &connector->display_info;
 509         unsigned int bp, hsync, vsync;
 510         u8 clk_delay;
 511         u32 val = 0;
 512
 513         WARN_ON(!tcon->quirks->has_channel_0);
 514
 515         tcon->dclk_min_div = tcon->quirks->dclk_min_div;
 516         tcon->dclk_max_div = 127;
 517         sun4i_tcon0_mode_set_common(tcon, mode);
 518
 519         /* Set dithering if needed */
 520         sun4i_tcon0_mode_set_dithering(tcon, connector);
 521
 522         /* Adjust clock delay */
 523         clk_delay = sun4i_tcon_get_clk_delay(mode, 0);
 524         regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
 525                            SUN4I_TCON0_CTL_CLK_DELAY_MASK,
 526                            SUN4I_TCON0_CTL_CLK_DELAY(clk_delay));
 527
 528         /*
 529          * This is called a backporch in the register documentation,
 530          * but it really is the back porch + hsync
 531          */
 532         bp = mode->crtc_htotal - mode->crtc_hsync_start;
 533         DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
 534                          mode->crtc_htotal, bp);
 535
 536         /* Set horizontal display timings */
 537         regmap_write(tcon->regs, SUN4I_TCON0_BASIC1_REG,
 538                      SUN4I_TCON0_BASIC1_H_TOTAL(mode->crtc_htotal) |
 539                      SUN4I_TCON0_BASIC1_H_BACKPORCH(bp));
 540
 541         /*
 542          * This is called a backporch in the register documentation,
 543          * but it really is the back porch + hsync
 544          */
 545         bp = mode->crtc_vtotal - mode->crtc_vsync_start;
 546         DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
 547                          mode->crtc_vtotal, bp);
 548
 549         /* Set vertical display timings */
 550         regmap_write(tcon->regs, SUN4I_TCON0_BASIC2_REG,
 551                      SUN4I_TCON0_BASIC2_V_TOTAL(mode->crtc_vtotal * 2) |
 552                      SUN4I_TCON0_BASIC2_V_BACKPORCH(bp));
 553
 554         /* Set Hsync and Vsync length */
 555         hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
 556         vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
 557         DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
 558         regmap_write(tcon->regs, SUN4I_TCON0_BASIC3_REG,
 559                      SUN4I_TCON0_BASIC3_V_SYNC(vsync) |
 560                      SUN4I_TCON0_BASIC3_H_SYNC(hsync));
 561
 562         /* Setup the polarity of the various signals */
 563         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 564                 val |= SUN4I_TCON0_IO_POL_HSYNC_POSITIVE;
 565
 566         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 567                 val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
 568
 569         if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
 570                 val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE;
 571
 572         /*
 573          * On A20 and similar SoCs, the only way to achieve Positive Edge
 574          * (Rising Edge), is setting dclk clock phase to 2/3(240°).
 575          * By default TCON works in Negative Edge(Falling Edge),
 576          * this is why phase is set to 0 in that case.
 577          * Unfortunately there's no way to logically invert dclk through
 578          * IO_POL register.
 579          * The only acceptable way to work, triple checked with scope,
 580          * is using clock phase set to 0° for Negative Edge and set to 240°
 581          * for Positive Edge.
 582          * On A33 and similar SoCs there would be a 90° phase option,
 583          * but it divides also dclk by 2.
 584          * Following code is a way to avoid quirks all around TCON
 585          * and DOTCLOCK drivers.
 586          */
 587         if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
 588                 clk_set_phase(tcon->dclk, 240);
 589
 590         if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
 591                 clk_set_phase(tcon->dclk, 0);
 592
 593         regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,
 594                            SUN4I_TCON0_IO_POL_HSYNC_POSITIVE |
 595                            SUN4I_TCON0_IO_POL_VSYNC_POSITIVE |
 596                            SUN4I_TCON0_IO_POL_DE_NEGATIVE,
 597                            val);
 598
 599         /* Map output pins to channel 0 */
 600         regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
 601                            SUN4I_TCON_GCTL_IOMAP_MASK,
 602                            SUN4I_TCON_GCTL_IOMAP_TCON0);
 603
 604         /* Enable the output on the pins */
 605         regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, 0);
 606 }
 607
 608 static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
 609                                  const struct drm_display_mode *mode)
 610 {
 611         unsigned int bp, hsync, vsync, vtotal;
 612         u8 clk_delay;
 613         u32 val;
 614
 615         WARN_ON(!tcon->quirks->has_channel_1);
 616
 617         /* Configure the dot clock */
 618         clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
 619
 620         /* Adjust clock delay */
 621         clk_delay = sun4i_tcon_get_clk_delay(mode, 1);
 622         regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
 623                            SUN4I_TCON1_CTL_CLK_DELAY_MASK,
 624                            SUN4I_TCON1_CTL_CLK_DELAY(clk_delay));
 625
 626         /* Set interlaced mode */
 627         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 628                 val = SUN4I_TCON1_CTL_INTERLACE_ENABLE;
 629         else
 630                 val = 0;
 631         regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
 632                            SUN4I_TCON1_CTL_INTERLACE_ENABLE,
 633                            val);
 634
 635         /* Set the input resolution */
 636         regmap_write(tcon->regs, SUN4I_TCON1_BASIC0_REG,
 637                      SUN4I_TCON1_BASIC0_X(mode->crtc_hdisplay) |
 638                      SUN4I_TCON1_BASIC0_Y(mode->crtc_vdisplay));
 639
 640         /* Set the upscaling resolution */
 641         regmap_write(tcon->regs, SUN4I_TCON1_BASIC1_REG,
 642                      SUN4I_TCON1_BASIC1_X(mode->crtc_hdisplay) |
 643                      SUN4I_TCON1_BASIC1_Y(mode->crtc_vdisplay));
 644
 645         /* Set the output resolution */
 646         regmap_write(tcon->regs, SUN4I_TCON1_BASIC2_REG,
 647                      SUN4I_TCON1_BASIC2_X(mode->crtc_hdisplay) |
 648                      SUN4I_TCON1_BASIC2_Y(mode->crtc_vdisplay));
 649
 650         /* Set horizontal display timings */
 651         bp = mode->crtc_htotal - mode->crtc_hsync_start;
 652         DRM_DEBUG_DRIVER("Setting horizontal total %d, backporch %d\n",
 653                          mode->htotal, bp);
 654         regmap_write(tcon->regs, SUN4I_TCON1_BASIC3_REG,
 655                      SUN4I_TCON1_BASIC3_H_TOTAL(mode->crtc_htotal) |
 656                      SUN4I_TCON1_BASIC3_H_BACKPORCH(bp));
 657
 658         bp = mode->crtc_vtotal - mode->crtc_vsync_start;
 659         DRM_DEBUG_DRIVER("Setting vertical total %d, backporch %d\n",
 660                          mode->crtc_vtotal, bp);
 661
 662         /*
 663          * The vertical resolution needs to be doubled in all
 664          * cases. We could use crtc_vtotal and always multiply by two,
 665          * but that leads to a rounding error in interlace when vtotal
 666          * is odd.
 667          *
 668          * This happens with TV's PAL for example, where vtotal will
 669          * be 625, crtc_vtotal 312, and thus crtc_vtotal * 2 will be
 670          * 624, which apparently confuses the hardware.
 671          *
 672          * To work around this, we will always use vtotal, and
 673          * multiply by two only if we're not in interlace.
 674          */
 675         vtotal = mode->vtotal;
 676         if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
 677                 vtotal = vtotal * 2;
 678
 679         /* Set vertical display timings */
 680         regmap_write(tcon->regs, SUN4I_TCON1_BASIC4_REG,
 681                      SUN4I_TCON1_BASIC4_V_TOTAL(vtotal) |
 682                      SUN4I_TCON1_BASIC4_V_BACKPORCH(bp));
 683
 684         /* Set Hsync and Vsync length */
 685         hsync = mode->crtc_hsync_end - mode->crtc_hsync_start;
 686         vsync = mode->crtc_vsync_end - mode->crtc_vsync_start;
 687         DRM_DEBUG_DRIVER("Setting HSYNC %d, VSYNC %d\n", hsync, vsync);
 688         regmap_write(tcon->regs, SUN4I_TCON1_BASIC5_REG,
 689                      SUN4I_TCON1_BASIC5_V_SYNC(vsync) |
 690                      SUN4I_TCON1_BASIC5_H_SYNC(hsync));
 691
 692         /* Map output pins to channel 1 */
 693         regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
 694                            SUN4I_TCON_GCTL_IOMAP_MASK,
 695                            SUN4I_TCON_GCTL_IOMAP_TCON1);
 696 }
 697
 698 void sun4i_tcon_mode_set(struct sun4i_tcon *tcon,
 699                          const struct drm_encoder *encoder,
 700                          const struct drm_display_mode *mode)
 701 {
 702         switch (encoder->encoder_type) {
 703         case DRM_MODE_ENCODER_DSI:
 704                 /* DSI is tied to special case of CPU interface */
 705                 sun4i_tcon0_mode_set_cpu(tcon, encoder, mode);
 706                 break;
 707         case DRM_MODE_ENCODER_LVDS:
 708                 sun4i_tcon0_mode_set_lvds(tcon, encoder, mode);
 709                 break;
 710         case DRM_MODE_ENCODER_NONE:
 711                 sun4i_tcon0_mode_set_rgb(tcon, encoder, mode);
 712                 sun4i_tcon_set_mux(tcon, 0, encoder);
 713                 break;
 714         case DRM_MODE_ENCODER_TVDAC:
 715         case DRM_MODE_ENCODER_TMDS:
 716                 sun4i_tcon1_mode_set(tcon, mode);
 717                 sun4i_tcon_set_mux(tcon, 1, encoder);
 718                 break;
 719         default:
 720                 DRM_DEBUG_DRIVER("Unknown encoder type, doing nothing...\n");
 721         }
 722 }
 723 EXPORT_SYMBOL(sun4i_tcon_mode_set);
 724
 725 static void sun4i_tcon_finish_page_flip(struct drm_device *dev,
 726                                         struct sun4i_crtc *scrtc)
 727 {
 728         unsigned long flags;
 729
 730         spin_lock_irqsave(&dev->event_lock, flags);
 731         if (scrtc->event) {
 732                 drm_crtc_send_vblank_event(&scrtc->crtc, scrtc->event);
 733                 drm_crtc_vblank_put(&scrtc->crtc);
 734                 scrtc->event = NULL;
 735         }
 736         spin_unlock_irqrestore(&dev->event_lock, flags);
 737 }
 738
 739 static irqreturn_t sun4i_tcon_handler(int irq, void *private)
 740 {
 741         struct sun4i_tcon *tcon = private;
 742         struct drm_device *drm = tcon->drm;
 743         struct sun4i_crtc *scrtc = tcon->crtc;
 744         struct sunxi_engine *engine = scrtc->engine;
 745         unsigned int status;
 746
 747         regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status);
 748
 749         if (!(status & (SUN4I_TCON_GINT0_VBLANK_INT(0) |
 750                         SUN4I_TCON_GINT0_VBLANK_INT(1) |
 751                         SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT)))
 752                 return IRQ_NONE;
 753
 754         drm_crtc_handle_vblank(&scrtc->crtc);
 755         sun4i_tcon_finish_page_flip(drm, scrtc);
 756
 757         /* Acknowledge the interrupt */
 758         regmap_update_bits(tcon->regs, SUN4I_TCON_GINT0_REG,
 759                            SUN4I_TCON_GINT0_VBLANK_INT(0) |
 760                            SUN4I_TCON_GINT0_VBLANK_INT(1) |
 761                            SUN4I_TCON_GINT0_TCON0_TRI_FINISH_INT,
 762                            0);
 763
 764         if (engine->ops->vblank_quirk)
 765                 engine->ops->vblank_quirk(engine);
 766
 767         return IRQ_HANDLED;
 768 }
 769
 770 static int sun4i_tcon_init_clocks(struct device *dev,
 771                                   struct sun4i_tcon *tcon)
 772 {
 773         tcon->clk = devm_clk_get(dev, "ahb");
 774         if (IS_ERR(tcon->clk)) {
 775                 dev_err(dev, "Couldn't get the TCON bus clock\n");
 776                 return PTR_ERR(tcon->clk);
 777         }
 778         clk_prepare_enable(tcon->clk);
 779
 780         if (tcon->quirks->has_channel_0) {
 781                 tcon->sclk0 = devm_clk_get(dev, "tcon-ch0");
 782                 if (IS_ERR(tcon->sclk0)) {
 783                         dev_err(dev, "Couldn't get the TCON channel 0 clock\n");
 784                         return PTR_ERR(tcon->sclk0);
 785                 }
 786         }
 787         clk_prepare_enable(tcon->sclk0);
 788
 789         if (tcon->quirks->has_channel_1) {
 790                 tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
 791                 if (IS_ERR(tcon->sclk1)) {
 792                         dev_err(dev, "Couldn't get the TCON channel 1 clock\n");
 793                         return PTR_ERR(tcon->sclk1);
 794                 }
 795         }
 796
 797         return 0;
 798 }
 799
 800 static void sun4i_tcon_free_clocks(struct sun4i_tcon *tcon)
 801 {
 802         clk_disable_unprepare(tcon->sclk0);
 803         clk_disable_unprepare(tcon->clk);
 804 }
 805
 806 static int sun4i_tcon_init_irq(struct device *dev,
 807                                struct sun4i_tcon *tcon)
 808 {
 809         struct platform_device *pdev = to_platform_device(dev);
 810         int irq, ret;
 811
 812         irq = platform_get_irq(pdev, 0);
 813         if (irq < 0)
 814                 return irq;
 815
 816         ret = devm_request_irq(dev, irq, sun4i_tcon_handler, 0,
 817                                dev_name(dev), tcon);
 818         if (ret) {
 819                 dev_err(dev, "Couldn't request the IRQ\n");
 820                 return ret;
 821         }
 822
 823         return 0;
 824 }
 825
 826 static const struct regmap_config sun4i_tcon_regmap_config = {
 827         .reg_bits       = 32,
 828         .val_bits       = 32,
 829         .reg_stride     = 4,
 830         .max_register   = 0x800,
 831 };
 832
 833 static int sun4i_tcon_init_regmap(struct device *dev,
 834                                   struct sun4i_tcon *tcon)
 835 {
 836         struct platform_device *pdev = to_platform_device(dev);
 837         struct resource *res;
 838         void __iomem *regs;
 839
 840         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 841         regs = devm_ioremap_resource(dev, res);
 842         if (IS_ERR(regs))
 843                 return PTR_ERR(regs);
 844
 845         tcon->regs = devm_regmap_init_mmio(dev, regs,
 846                                            &sun4i_tcon_regmap_config);
 847         if (IS_ERR(tcon->regs)) {
 848                 dev_err(dev, "Couldn't create the TCON regmap\n");
 849                 return PTR_ERR(tcon->regs);
 850         }
 851
 852         /* Make sure the TCON is disabled and all IRQs are off */
 853         regmap_write(tcon->regs, SUN4I_TCON_GCTL_REG, 0);
 854         regmap_write(tcon->regs, SUN4I_TCON_GINT0_REG, 0);
 855         regmap_write(tcon->regs, SUN4I_TCON_GINT1_REG, 0);
 856
 857         /* Disable IO lines and set them to tristate */
 858         regmap_write(tcon->regs, SUN4I_TCON0_IO_TRI_REG, ~0);
 859         regmap_write(tcon->regs, SUN4I_TCON1_IO_TRI_REG, ~0);
 860
 861         return 0;
 862 }
 863
 864 /*
 865  * On SoCs with the old display pipeline design (Display Engine 1.0),
 866  * the TCON is always tied to just one backend. Hence we can traverse
 867  * the of_graph upwards to find the backend our tcon is connected to,
 868  * and take its ID as our own.
 869  *
 870  * We can either identify backends from their compatible strings, which
 871  * means maintaining a large list of them. Or, since the backend is
 872  * registered and binded before the TCON, we can just go through the
 873  * list of registered backends and compare the device node.
 874  *
 875  * As the structures now store engines instead of backends, here this
 876  * function in fact searches the corresponding engine, and the ID is
 877  * requested via the get_id function of the engine.
 878  */
 879 static struct sunxi_engine *
 880 sun4i_tcon_find_engine_traverse(struct sun4i_drv *drv,
 881                                 struct device_node *node,
 882                                 u32 port_id)
 883 {
 884         struct device_node *port, *ep, *remote;
 885         struct sunxi_engine *engine = ERR_PTR(-EINVAL);
 886         u32 reg = 0;
 887
 888         port = of_graph_get_port_by_id(node, port_id);
 889         if (!port)
 890                 return ERR_PTR(-EINVAL);
 891
 892         /*
 893          * This only works if there is only one path from the TCON
 894          * to any display engine. Otherwise the probe order of the
 895          * TCONs and display engines is not guaranteed. They may
 896          * either bind to the wrong one, or worse, bind to the same
 897          * one if additional checks are not done.
 898          *
 899          * Bail out if there are multiple input connections.
 900          */
 901         if (of_get_available_child_count(port) != 1)
 902                 goto out_put_port;
 903
 904         /* Get the first connection without specifying an ID */
 905         ep = of_get_next_available_child(port, NULL);
 906         if (!ep)
 907                 goto out_put_port;
 908
 909         remote = of_graph_get_remote_port_parent(ep);
 910         if (!remote)
 911                 goto out_put_ep;
 912
 913         /* does this node match any registered engines? */
 914         list_for_each_entry(engine, &drv->engine_list, list)
 915                 if (remote == engine->node)
 916                         goto out_put_remote;
 917
 918         /*
 919          * According to device tree binding input ports have even id
 920          * number and output ports have odd id. Since component with
 921          * more than one input and one output (TCON TOP) exits, correct
 922          * remote input id has to be calculated by subtracting 1 from
 923          * remote output id. If this for some reason can't be done, 0
 924          * is used as input port id.
 925          */
 926         of_node_put(port);
 927         port = of_graph_get_remote_port(ep);
 928         if (!of_property_read_u32(port, "reg", &reg) && reg > 0)
 929                 reg -= 1;
 930
 931         /* keep looking through upstream ports */
 932         engine = sun4i_tcon_find_engine_traverse(drv, remote, reg);
 933
 934 out_put_remote:
 935         of_node_put(remote);
 936 out_put_ep:
 937         of_node_put(ep);
 938 out_put_port:
 939         of_node_put(port);
 940
 941         return engine;
 942 }
 943
 944 /*
 945  * The device tree binding says that the remote endpoint ID of any
 946  * connection between components, up to and including the TCON, of
 947  * the display pipeline should be equal to the actual ID of the local
 948  * component. Thus we can look at any one of the input connections of
 949  * the TCONs, and use that connection's remote endpoint ID as our own.
 950  *
 951  * Since the user of this function already finds the input port,
 952  * the port is passed in directly without further checks.
 953  */
 954 static int sun4i_tcon_of_get_id_from_port(struct device_node *port)
 955 {
 956         struct device_node *ep;
 957         int ret = -EINVAL;
 958
 959         /* try finding an upstream endpoint */
 960         for_each_available_child_of_node(port, ep) {
 961                 struct device_node *remote;
 962                 u32 reg;
 963
 964                 remote = of_graph_get_remote_endpoint(ep);
 965                 if (!remote)
 966                         continue;
 967
 968                 ret = of_property_read_u32(remote, "reg", &reg);
 969                 if (ret)
 970                         continue;
 971
 972                 ret = reg;
 973         }
 974
 975         return ret;
 976 }
 977
 978 /*
 979  * Once we know the TCON's id, we can look through the list of
 980  * engines to find a matching one. We assume all engines have
 981  * been probed and added to the list.
 982  */
 983 static struct sunxi_engine *sun4i_tcon_get_engine_by_id(struct sun4i_drv *drv,
 984                                                         int id)
 985 {
 986         struct sunxi_engine *engine;
 987
 988         list_for_each_entry(engine, &drv->engine_list, list)
 989                 if (engine->id == id)
 990                         return engine;
 991
 992         return ERR_PTR(-EINVAL);
 993 }
 994
 995 static bool sun4i_tcon_connected_to_tcon_top(struct device_node *node)
 996 {
 997         struct device_node *remote;
 998         bool ret = false;
 999
1000         remote = of_graph_get_remote_node(node, 0, -1);
1001         if (remote) {
1002                 ret = !!(IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
1003                          of_match_node(sun8i_tcon_top_of_table, remote));
1004                 of_node_put(remote);
1005         }
1006
1007         return ret;
1008 }
1009
1010 static int sun4i_tcon_get_index(struct sun4i_drv *drv)
1011 {
1012         struct list_head *pos;
1013         int size = 0;
1014
1015         /*
1016          * Because TCON is added to the list at the end of the probe
1017          * (after this function is called), index of the current TCON
1018          * will be same as current TCON list size.
1019          */
1020         list_for_each(pos, &drv->tcon_list)
1021                 ++size;
1022
1023         return size;
1024 }
1025
1026 /*
1027  * On SoCs with the old display pipeline design (Display Engine 1.0),
1028  * we assumed the TCON was always tied to just one backend. However
1029  * this proved not to be the case. On the A31, the TCON can select
1030  * either backend as its source. On the A20 (and likely on the A10),
1031  * the backend can choose which TCON to output to.
1032  *
1033  * The device tree binding says that the remote endpoint ID of any
1034  * connection between components, up to and including the TCON, of
1035  * the display pipeline should be equal to the actual ID of the local
1036  * component. Thus we should be able to look at any one of the input
1037  * connections of the TCONs, and use that connection's remote endpoint
1038  * ID as our own.
1039  *
1040  * However  the connections between the backend and TCON were assumed
1041  * to be always singular, and their endpoit IDs were all incorrectly
1042  * set to 0. This means for these old device trees, we cannot just look
1043  * up the remote endpoint ID of a TCON input endpoint. TCON1 would be
1044  * incorrectly identified as TCON0.
1045  *
1046  * This function first checks if the TCON node has 2 input endpoints.
1047  * If so, then the device tree is a corrected version, and it will use
1048  * sun4i_tcon_of_get_id() and sun4i_tcon_get_engine_by_id() from above
1049  * to fetch the ID and engine directly. If not, then it is likely an
1050  * old device trees, where the endpoint IDs were incorrect, but did not
1051  * have endpoint connections between the backend and TCON across
1052  * different display pipelines. It will fall back to the old method of
1053  * traversing the  of_graph to try and find a matching engine by device
1054  * node.
1055  *
1056  * In the case of single display pipeline device trees, either method
1057  * works.
1058  */
1059 static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv,
1060                                                    struct device_node *node)
1061 {
1062         struct device_node *port;
1063         struct sunxi_engine *engine;
1064
1065         port = of_graph_get_port_by_id(node, 0);
1066         if (!port)
1067                 return ERR_PTR(-EINVAL);
1068
1069         /*
1070          * Is this a corrected device tree with cross pipeline
1071          * connections between the backend and TCON?
1072          */
1073         if (of_get_child_count(port) > 1) {
1074                 int id;
1075
1076                 /*
1077                  * When pipeline has the same number of TCONs and engines which
1078                  * are represented by frontends/backends (DE1) or mixers (DE2),
1079                  * we match them by their respective IDs. However, if pipeline
1080                  * contains TCON TOP, chances are that there are either more
1081                  * TCONs than engines (R40) or TCONs with non-consecutive ids.
1082                  * (H6). In that case it's easier just use TCON index in list
1083                  * as an id. That means that on R40, any 2 TCONs can be enabled
1084                  * in DT out of 4 (there are 2 mixers). Due to the design of
1085                  * TCON TOP, remaining 2 TCONs can't be connected to anything
1086                  * anyway.
1087                  */
1088                 if (sun4i_tcon_connected_to_tcon_top(node))
1089                         id = sun4i_tcon_get_index(drv);
1090                 else
1091                         id = sun4i_tcon_of_get_id_from_port(port);
1092
1093                 /* Get our engine by matching our ID */
1094                 engine = sun4i_tcon_get_engine_by_id(drv, id);
1095
1096                 of_node_put(port);
1097                 return engine;
1098         }
1099
1100         /* Fallback to old method by traversing input endpoints */
1101         of_node_put(port);
1102         return sun4i_tcon_find_engine_traverse(drv, node, 0);
1103 }
1104
1105 static int sun4i_tcon_bind(struct device *dev, struct device *master,
1106                            void *data)
1107 {
1108         struct drm_device *drm = data;
1109         struct sun4i_drv *drv = drm->dev_private;
1110         struct sunxi_engine *engine;
1111         struct device_node *remote;
1112         struct sun4i_tcon *tcon;
1113         struct reset_control *edp_rstc;
1114         bool has_lvds_rst, has_lvds_alt, can_lvds;
1115         int ret;
1116
1117         engine = sun4i_tcon_find_engine(drv, dev->of_node);
1118         if (IS_ERR(engine)) {
1119                 dev_err(dev, "Couldn't find matching engine\n");
1120                 return -EPROBE_DEFER;
1121         }
1122
1123         tcon = devm_kzalloc(dev, sizeof(*tcon), GFP_KERNEL);
1124         if (!tcon)
1125                 return -ENOMEM;
1126         dev_set_drvdata(dev, tcon);
1127         tcon->drm = drm;
1128         tcon->dev = dev;
1129         tcon->id = engine->id;
1130         tcon->quirks = of_device_get_match_data(dev);
1131
1132         tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
1133         if (IS_ERR(tcon->lcd_rst)) {
1134                 dev_err(dev, "Couldn't get our reset line\n");
1135                 return PTR_ERR(tcon->lcd_rst);
1136         }
1137
1138         if (tcon->quirks->needs_edp_reset) {
1139                 edp_rstc = devm_reset_control_get_shared(dev, "edp");
1140                 if (IS_ERR(edp_rstc)) {
1141                         dev_err(dev, "Couldn't get edp reset line\n");
1142                         return PTR_ERR(edp_rstc);
1143                 }
1144
1145                 ret = reset_control_deassert(edp_rstc);
1146                 if (ret) {
1147                         dev_err(dev, "Couldn't deassert edp reset line\n");
1148                         return ret;
1149                 }
1150         }
1151
1152         /* Make sure our TCON is reset */
1153         ret = reset_control_reset(tcon->lcd_rst);
1154         if (ret) {
1155                 dev_err(dev, "Couldn't deassert our reset line\n");
1156                 return ret;
1157         }
1158
1159         if (tcon->quirks->supports_lvds) {
1160                 /*
1161                  * This can only be made optional since we've had DT
1162                  * nodes without the LVDS reset properties.
1163                  *
1164                  * If the property is missing, just disable LVDS, and
1165                  * print a warning.
1166                  */
1167                 tcon->lvds_rst = devm_reset_control_get_optional(dev, "lvds");
1168                 if (IS_ERR(tcon->lvds_rst)) {
1169                         dev_err(dev, "Couldn't get our reset line\n");
1170                         return PTR_ERR(tcon->lvds_rst);
1171                 } else if (tcon->lvds_rst) {
1172                         has_lvds_rst = true;
1173                         reset_control_reset(tcon->lvds_rst);
1174                 } else {
1175                         has_lvds_rst = false;
1176                 }
1177
1178                 /*
1179                  * This can only be made optional since we've had DT
1180                  * nodes without the LVDS reset properties.
1181                  *
1182                  * If the property is missing, just disable LVDS, and
1183                  * print a warning.
1184                  */
1185                 if (tcon->quirks->has_lvds_alt) {
1186                         tcon->lvds_pll = devm_clk_get(dev, "lvds-alt");
1187                         if (IS_ERR(tcon->lvds_pll)) {
1188                                 if (PTR_ERR(tcon->lvds_pll) == -ENOENT) {
1189                                         has_lvds_alt = false;
1190                                 } else {
1191                                         dev_err(dev, "Couldn't get the LVDS PLL\n");
1192                                         return PTR_ERR(tcon->lvds_pll);
1193                                 }
1194                         } else {
1195                                 has_lvds_alt = true;
1196                         }
1197                 }
1198
1199                 if (!has_lvds_rst ||
1200                     (tcon->quirks->has_lvds_alt && !has_lvds_alt)) {
1201                         dev_warn(dev, "Missing LVDS properties, Please upgrade your DT\n");
1202                         dev_warn(dev, "LVDS output disabled\n");
1203                         can_lvds = false;
1204                 } else {
1205                         can_lvds = true;
1206                 }
1207         } else {
1208                 can_lvds = false;
1209         }
1210
1211         ret = sun4i_tcon_init_clocks(dev, tcon);
1212         if (ret) {
1213                 dev_err(dev, "Couldn't init our TCON clocks\n");
1214                 goto err_assert_reset;
1215         }
1216
1217         ret = sun4i_tcon_init_regmap(dev, tcon);
1218         if (ret) {
1219                 dev_err(dev, "Couldn't init our TCON regmap\n");
1220                 goto err_free_clocks;
1221         }
1222
1223         if (tcon->quirks->has_channel_0) {
1224                 ret = sun4i_dclk_create(dev, tcon);
1225                 if (ret) {
1226                         dev_err(dev, "Couldn't create our TCON dot clock\n");
1227                         goto err_free_clocks;
1228                 }
1229         }
1230
1231         ret = sun4i_tcon_init_irq(dev, tcon);
1232         if (ret) {
1233                 dev_err(dev, "Couldn't init our TCON interrupts\n");
1234                 goto err_free_dotclock;
1235         }
1236
1237         tcon->crtc = sun4i_crtc_init(drm, engine, tcon);
1238         if (IS_ERR(tcon->crtc)) {
1239                 dev_err(dev, "Couldn't create our CRTC\n");
1240                 ret = PTR_ERR(tcon->crtc);
1241                 goto err_free_dotclock;
1242         }
1243
1244         if (tcon->quirks->has_channel_0) {
1245                 /*
1246                  * If we have an LVDS panel connected to the TCON, we should
1247                  * just probe the LVDS connector. Otherwise, just probe RGB as
1248                  * we used to.
1249                  */
1250                 remote = of_graph_get_remote_node(dev->of_node, 1, 0);
1251                 if (of_device_is_compatible(remote, "panel-lvds"))
1252                         if (can_lvds)
1253                                 ret = sun4i_lvds_init(drm, tcon);
1254                         else
1255                                 ret = -EINVAL;
1256                 else
1257                         ret = sun4i_rgb_init(drm, tcon);
1258                 of_node_put(remote);
1259
1260                 if (ret < 0)
1261                         goto err_free_dotclock;
1262         }
1263
1264         if (tcon->quirks->needs_de_be_mux) {
1265                 /*
1266                  * We assume there is no dynamic muxing of backends
1267                  * and TCONs, so we select the backend with same ID.
1268                  *
1269                  * While dynamic selection might be interesting, since
1270                  * the CRTC is tied to the TCON, while the layers are
1271                  * tied to the backends, this means, we will need to
1272                  * switch between groups of layers. There might not be
1273                  * a way to represent this constraint in DRM.
1274                  */
1275                 regmap_update_bits(tcon->regs, SUN4I_TCON0_CTL_REG,
1276                                    SUN4I_TCON0_CTL_SRC_SEL_MASK,
1277                                    tcon->id);
1278                 regmap_update_bits(tcon->regs, SUN4I_TCON1_CTL_REG,
1279                                    SUN4I_TCON1_CTL_SRC_SEL_MASK,
1280                                    tcon->id);
1281         }
1282
1283         list_add_tail(&tcon->list, &drv->tcon_list);
1284
1285         return 0;
1286
1287 err_free_dotclock:
1288         if (tcon->quirks->has_channel_0)
1289                 sun4i_dclk_free(tcon);
1290 err_free_clocks:
1291         sun4i_tcon_free_clocks(tcon);
1292 err_assert_reset:
1293         reset_control_assert(tcon->lcd_rst);
1294         return ret;
1295 }
1296
1297 static void sun4i_tcon_unbind(struct device *dev, struct device *master,
1298                               void *data)
1299 {
1300         struct sun4i_tcon *tcon = dev_get_drvdata(dev);
1301
1302         list_del(&tcon->list);
1303         if (tcon->quirks->has_channel_0)
1304                 sun4i_dclk_free(tcon);
1305         sun4i_tcon_free_clocks(tcon);
1306 }
1307
1308 static const struct component_ops sun4i_tcon_ops = {
1309         .bind   = sun4i_tcon_bind,
1310         .unbind = sun4i_tcon_unbind,
1311 };
1312
1313 static int sun4i_tcon_probe(struct platform_device *pdev)
1314 {
1315         struct device_node *node = pdev->dev.of_node;
1316         const struct sun4i_tcon_quirks *quirks;
1317         struct drm_bridge *bridge;
1318         struct drm_panel *panel;
1319         int ret;
1320
1321         quirks = of_device_get_match_data(&pdev->dev);
1322
1323         /* panels and bridges are present only on TCONs with channel 0 */
1324         if (quirks->has_channel_0) {
1325                 ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
1326                 if (ret == -EPROBE_DEFER)
1327                         return ret;
1328         }
1329
1330         return component_add(&pdev->dev, &sun4i_tcon_ops);
1331 }
1332
1333 static int sun4i_tcon_remove(struct platform_device *pdev)
1334 {
1335         component_del(&pdev->dev, &sun4i_tcon_ops);
1336
1337         return 0;
1338 }
1339
1340 /* platform specific TCON muxing callbacks */
1341 static int sun4i_a10_tcon_set_mux(struct sun4i_tcon *tcon,
1342                                   const struct drm_encoder *encoder)
1343 {
1344         struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
1345         u32 shift;
1346
1347         if (!tcon0)
1348                 return -EINVAL;
1349
1350         switch (encoder->encoder_type) {
1351         case DRM_MODE_ENCODER_TMDS:
1352                 /* HDMI */
1353                 shift = 8;
1354                 break;
1355         default:
1356                 return -EINVAL;
1357         }
1358
1359         regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
1360                            0x3 << shift, tcon->id << shift);
1361
1362         return 0;
1363 }
1364
1365 static int sun5i_a13_tcon_set_mux(struct sun4i_tcon *tcon,
1366                                   const struct drm_encoder *encoder)
1367 {
1368         u32 val;
1369
1370         if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
1371                 val = 1;
1372         else
1373                 val = 0;
1374
1375         /*
1376          * FIXME: Undocumented bits
1377          */
1378         return regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
1379 }
1380
1381 static int sun6i_tcon_set_mux(struct sun4i_tcon *tcon,
1382                               const struct drm_encoder *encoder)
1383 {
1384         struct sun4i_tcon *tcon0 = sun4i_get_tcon0(encoder->dev);
1385         u32 shift;
1386
1387         if (!tcon0)
1388                 return -EINVAL;
1389
1390         switch (encoder->encoder_type) {
1391         case DRM_MODE_ENCODER_TMDS:
1392                 /* HDMI */
1393                 shift = 8;
1394                 break;
1395         default:
1396                 /* TODO A31 has MIPI DSI but A31s does not */
1397                 return -EINVAL;
1398         }
1399
1400         regmap_update_bits(tcon0->regs, SUN4I_TCON_MUX_CTRL_REG,
1401                            0x3 << shift, tcon->id << shift);
1402
1403         return 0;
1404 }
1405
1406 static int sun8i_r40_tcon_tv_set_mux(struct sun4i_tcon *tcon,
1407                                      const struct drm_encoder *encoder)
1408 {
1409         struct device_node *port, *remote;
1410         struct platform_device *pdev;
1411         int id, ret;
1412
1413         /* find TCON TOP platform device and TCON id */
1414
1415         port = of_graph_get_port_by_id(tcon->dev->of_node, 0);
1416         if (!port)
1417                 return -EINVAL;
1418
1419         id = sun4i_tcon_of_get_id_from_port(port);
1420         of_node_put(port);
1421
1422         remote = of_graph_get_remote_node(tcon->dev->of_node, 0, -1);
1423         if (!remote)
1424                 return -EINVAL;
1425
1426         pdev = of_find_device_by_node(remote);
1427         of_node_put(remote);
1428         if (!pdev)
1429                 return -EINVAL;
1430
1431         if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
1432             encoder->encoder_type == DRM_MODE_ENCODER_TMDS) {
1433                 ret = sun8i_tcon_top_set_hdmi_src(&pdev->dev, id);
1434                 if (ret) {
1435                         put_device(&pdev->dev);
1436                         return ret;
1437                 }
1438         }
1439
1440         if (IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP)) {
1441                 ret = sun8i_tcon_top_de_config(&pdev->dev, tcon->id, id);
1442                 if (ret) {
1443                         put_device(&pdev->dev);
1444                         return ret;
1445                 }
1446         }
1447
1448         return 0;
1449 }
1450
1451 static const struct sun4i_tcon_quirks sun4i_a10_quirks = {
1452         .has_channel_0          = true,
1453         .has_channel_1          = true,
1454         .dclk_min_div           = 4,
1455         .set_mux                = sun4i_a10_tcon_set_mux,
1456 };
1457
1458 static const struct sun4i_tcon_quirks sun5i_a13_quirks = {
1459         .has_channel_0          = true,
1460         .has_channel_1          = true,
1461         .dclk_min_div           = 4,
1462         .set_mux                = sun5i_a13_tcon_set_mux,
1463 };
1464
1465 static const struct sun4i_tcon_quirks sun6i_a31_quirks = {
1466         .has_channel_0          = true,
1467         .has_channel_1          = true,
1468         .has_lvds_alt           = true,
1469         .needs_de_be_mux        = true,
1470         .dclk_min_div           = 1,
1471         .set_mux                = sun6i_tcon_set_mux,
1472 };
1473
1474 static const struct sun4i_tcon_quirks sun6i_a31s_quirks = {
1475         .has_channel_0          = true,
1476         .has_channel_1          = true,
1477         .needs_de_be_mux        = true,
1478         .dclk_min_div           = 1,
1479 };
1480
1481 static const struct sun4i_tcon_quirks sun7i_a20_tcon0_quirks = {
1482         .supports_lvds          = true,
1483         .has_channel_0          = true,
1484         .has_channel_1          = true,
1485         .dclk_min_div           = 4,
1486         /* Same display pipeline structure as A10 */
1487         .set_mux                = sun4i_a10_tcon_set_mux,
1488         .setup_lvds_phy         = sun4i_tcon_setup_lvds_phy,
1489 };
1490
1491 static const struct sun4i_tcon_quirks sun7i_a20_quirks = {
1492         .has_channel_0          = true,
1493         .has_channel_1          = true,
1494         .dclk_min_div           = 4,
1495         /* Same display pipeline structure as A10 */
1496         .set_mux                = sun4i_a10_tcon_set_mux,
1497 };
1498
1499 static const struct sun4i_tcon_quirks sun8i_a33_quirks = {
1500         .has_channel_0          = true,
1501         .has_lvds_alt           = true,
1502         .dclk_min_div           = 1,
1503         .setup_lvds_phy         = sun6i_tcon_setup_lvds_phy,
1504         .supports_lvds          = true,
1505 };
1506
1507 static const struct sun4i_tcon_quirks sun8i_a83t_lcd_quirks = {
1508         .supports_lvds          = true,
1509         .has_channel_0          = true,
1510         .dclk_min_div           = 1,
1511         .setup_lvds_phy         = sun6i_tcon_setup_lvds_phy,
1512 };
1513
1514 static const struct sun4i_tcon_quirks sun8i_a83t_tv_quirks = {
1515         .has_channel_1          = true,
1516 };
1517
1518 static const struct sun4i_tcon_quirks sun8i_r40_tv_quirks = {
1519         .has_channel_1          = true,
1520         .set_mux                = sun8i_r40_tcon_tv_set_mux,
1521 };
1522
1523 static const struct sun4i_tcon_quirks sun8i_v3s_quirks = {
1524         .has_channel_0          = true,
1525         .dclk_min_div           = 1,
1526 };
1527
1528 static const struct sun4i_tcon_quirks sun9i_a80_tcon_lcd_quirks = {
1529         .has_channel_0          = true,
1530         .needs_edp_reset        = true,
1531         .dclk_min_div           = 1,
1532 };
1533
1534 static const struct sun4i_tcon_quirks sun9i_a80_tcon_tv_quirks = {
1535         .has_channel_1  = true,
1536         .needs_edp_reset = true,
1537 };
1538
1539 /* sun4i_drv uses this list to check if a device node is a TCON */
1540 const struct of_device_id sun4i_tcon_of_table[] = {
1541         { .compatible = "allwinner,sun4i-a10-tcon", .data = &sun4i_a10_quirks },
1542         { .compatible = "allwinner,sun5i-a13-tcon", .data = &sun5i_a13_quirks },
1543         { .compatible = "allwinner,sun6i-a31-tcon", .data = &sun6i_a31_quirks },
1544         { .compatible = "allwinner,sun6i-a31s-tcon", .data = &sun6i_a31s_quirks },
1545         { .compatible = "allwinner,sun7i-a20-tcon", .data = &sun7i_a20_quirks },
1546         { .compatible = "allwinner,sun7i-a20-tcon0", .data = &sun7i_a20_tcon0_quirks },
1547         { .compatible = "allwinner,sun7i-a20-tcon1", .data = &sun7i_a20_quirks },
1548         { .compatible = "allwinner,sun8i-a23-tcon", .data = &sun8i_a33_quirks },
1549         { .compatible = "allwinner,sun8i-a33-tcon", .data = &sun8i_a33_quirks },
1550         { .compatible = "allwinner,sun8i-a83t-tcon-lcd", .data = &sun8i_a83t_lcd_quirks },
1551         { .compatible = "allwinner,sun8i-a83t-tcon-tv", .data = &sun8i_a83t_tv_quirks },
1552         { .compatible = "allwinner,sun8i-r40-tcon-tv", .data = &sun8i_r40_tv_quirks },
1553         { .compatible = "allwinner,sun8i-v3s-tcon", .data = &sun8i_v3s_quirks },
1554         { .compatible = "allwinner,sun9i-a80-tcon-lcd", .data = &sun9i_a80_tcon_lcd_quirks },
1555         { .compatible = "allwinner,sun9i-a80-tcon-tv", .data = &sun9i_a80_tcon_tv_quirks },
1556         { }
1557 };
1558 MODULE_DEVICE_TABLE(of, sun4i_tcon_of_table);
1559 EXPORT_SYMBOL(sun4i_tcon_of_table);
1560
1561 static struct platform_driver sun4i_tcon_platform_driver = {
1562         .probe          = sun4i_tcon_probe,
1563         .remove         = sun4i_tcon_remove,
1564         .driver         = {
1565                 .name           = "sun4i-tcon",
1566                 .of_match_table = sun4i_tcon_of_table,
1567         },
1568 };
1569 module_platform_driver(sun4i_tcon_platform_driver);
1570
1571 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
1572 MODULE_DESCRIPTION("Allwinner A10 Timing Controller Driver");
1573 MODULE_LICENSE("GPL");