drivers/gpu/drm/mediatek/mtk_dpi.c

   1 /*
   2  * Copyright (c) 2014 MediaTek Inc.
   3  * Author: Jie Qiu <jie.qiu@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <drm/drmP.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <linux/kernel.h>
  18 #include <linux/component.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/of.h>
  21 #include <linux/of_graph.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/types.h>
  24 #include <linux/clk.h>
  25
  26 #include "mtk_dpi_regs.h"
  27 #include "mtk_drm_ddp_comp.h"
  28
  29 enum mtk_dpi_out_bit_num {
  30         MTK_DPI_OUT_BIT_NUM_8BITS,
  31         MTK_DPI_OUT_BIT_NUM_10BITS,
  32         MTK_DPI_OUT_BIT_NUM_12BITS,
  33         MTK_DPI_OUT_BIT_NUM_16BITS
  34 };
  35
  36 enum mtk_dpi_out_yc_map {
  37         MTK_DPI_OUT_YC_MAP_RGB,
  38         MTK_DPI_OUT_YC_MAP_CYCY,
  39         MTK_DPI_OUT_YC_MAP_YCYC,
  40         MTK_DPI_OUT_YC_MAP_CY,
  41         MTK_DPI_OUT_YC_MAP_YC
  42 };
  43
  44 enum mtk_dpi_out_channel_swap {
  45         MTK_DPI_OUT_CHANNEL_SWAP_RGB,
  46         MTK_DPI_OUT_CHANNEL_SWAP_GBR,
  47         MTK_DPI_OUT_CHANNEL_SWAP_BRG,
  48         MTK_DPI_OUT_CHANNEL_SWAP_RBG,
  49         MTK_DPI_OUT_CHANNEL_SWAP_GRB,
  50         MTK_DPI_OUT_CHANNEL_SWAP_BGR
  51 };
  52
  53 enum mtk_dpi_out_color_format {
  54         MTK_DPI_COLOR_FORMAT_RGB
  55 };
  56
  57 struct mtk_dpi {
  58         struct mtk_ddp_comp ddp_comp;
  59         struct drm_encoder encoder;
  60         struct drm_bridge *bridge;
  61         void __iomem *regs;
  62         struct device *dev;
  63         struct clk *engine_clk;
  64         struct clk *pixel_clk;
  65         struct clk *tvd_clk;
  66         int irq;
  67         struct drm_display_mode mode;
  68         enum mtk_dpi_out_color_format color_format;
  69         enum mtk_dpi_out_yc_map yc_map;
  70         enum mtk_dpi_out_bit_num bit_num;
  71         enum mtk_dpi_out_channel_swap channel_swap;
  72         bool power_sta;
  73         u8 power_ctl;
  74 };
  75
  76 static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
  77 {
  78         return container_of(e, struct mtk_dpi, encoder);
  79 }
  80
  81 enum mtk_dpi_polarity {
  82         MTK_DPI_POLARITY_RISING,
  83         MTK_DPI_POLARITY_FALLING,
  84 };
  85
  86 enum mtk_dpi_power_ctl {
  87         DPI_POWER_START = BIT(0),
  88         DPI_POWER_ENABLE = BIT(1),
  89 };
  90
  91 struct mtk_dpi_polarities {
  92         enum mtk_dpi_polarity de_pol;
  93         enum mtk_dpi_polarity ck_pol;
  94         enum mtk_dpi_polarity hsync_pol;
  95         enum mtk_dpi_polarity vsync_pol;
  96 };
  97
  98 struct mtk_dpi_sync_param {
  99         u32 sync_width;
 100         u32 front_porch;
 101         u32 back_porch;
 102         bool shift_half_line;
 103 };
 104
 105 struct mtk_dpi_yc_limit {
 106         u16 y_top;
 107         u16 y_bottom;
 108         u16 c_top;
 109         u16 c_bottom;
 110 };
 111
 112 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
 113 {
 114         u32 tmp = readl(dpi->regs + offset) & ~mask;
 115
 116         tmp |= (val & mask);
 117         writel(tmp, dpi->regs + offset);
 118 }
 119
 120 static void mtk_dpi_sw_reset(struct mtk_dpi *dpi, bool reset)
 121 {
 122         mtk_dpi_mask(dpi, DPI_RET, reset ? RST : 0, RST);
 123 }
 124
 125 static void mtk_dpi_enable(struct mtk_dpi *dpi)
 126 {
 127         mtk_dpi_mask(dpi, DPI_EN, EN, EN);
 128 }
 129
 130 static void mtk_dpi_disable(struct mtk_dpi *dpi)
 131 {
 132         mtk_dpi_mask(dpi, DPI_EN, 0, EN);
 133 }
 134
 135 static void mtk_dpi_config_hsync(struct mtk_dpi *dpi,
 136                                  struct mtk_dpi_sync_param *sync)
 137 {
 138         mtk_dpi_mask(dpi, DPI_TGEN_HWIDTH,
 139                      sync->sync_width << HPW, HPW_MASK);
 140         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH,
 141                      sync->back_porch << HBP, HBP_MASK);
 142         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH, sync->front_porch << HFP,
 143                      HFP_MASK);
 144 }
 145
 146 static void mtk_dpi_config_vsync(struct mtk_dpi *dpi,
 147                                  struct mtk_dpi_sync_param *sync,
 148                                  u32 width_addr, u32 porch_addr)
 149 {
 150         mtk_dpi_mask(dpi, width_addr,
 151                      sync->sync_width << VSYNC_WIDTH_SHIFT,
 152                      VSYNC_WIDTH_MASK);
 153         mtk_dpi_mask(dpi, width_addr,
 154                      sync->shift_half_line << VSYNC_HALF_LINE_SHIFT,
 155                      VSYNC_HALF_LINE_MASK);
 156         mtk_dpi_mask(dpi, porch_addr,
 157                      sync->back_porch << VSYNC_BACK_PORCH_SHIFT,
 158                      VSYNC_BACK_PORCH_MASK);
 159         mtk_dpi_mask(dpi, porch_addr,
 160                      sync->front_porch << VSYNC_FRONT_PORCH_SHIFT,
 161                      VSYNC_FRONT_PORCH_MASK);
 162 }
 163
 164 static void mtk_dpi_config_vsync_lodd(struct mtk_dpi *dpi,
 165                                       struct mtk_dpi_sync_param *sync)
 166 {
 167         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH, DPI_TGEN_VPORCH);
 168 }
 169
 170 static void mtk_dpi_config_vsync_leven(struct mtk_dpi *dpi,
 171                                        struct mtk_dpi_sync_param *sync)
 172 {
 173         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_LEVEN,
 174                              DPI_TGEN_VPORCH_LEVEN);
 175 }
 176
 177 static void mtk_dpi_config_vsync_rodd(struct mtk_dpi *dpi,
 178                                       struct mtk_dpi_sync_param *sync)
 179 {
 180         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_RODD,
 181                              DPI_TGEN_VPORCH_RODD);
 182 }
 183
 184 static void mtk_dpi_config_vsync_reven(struct mtk_dpi *dpi,
 185                                        struct mtk_dpi_sync_param *sync)
 186 {
 187         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_REVEN,
 188                              DPI_TGEN_VPORCH_REVEN);
 189 }
 190
 191 static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
 192                                struct mtk_dpi_polarities *dpi_pol)
 193 {
 194         unsigned int pol;
 195
 196         pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) |
 197               (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) |
 198               (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
 199               (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
 200         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
 201                      CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
 202 }
 203
 204 static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
 205 {
 206         mtk_dpi_mask(dpi, DPI_CON, en_3d ? TDFP_EN : 0, TDFP_EN);
 207 }
 208
 209 static void mtk_dpi_config_interface(struct mtk_dpi *dpi, bool inter)
 210 {
 211         mtk_dpi_mask(dpi, DPI_CON, inter ? INTL_EN : 0, INTL_EN);
 212 }
 213
 214 static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
 215 {
 216         mtk_dpi_mask(dpi, DPI_SIZE, width << HSIZE, HSIZE_MASK);
 217         mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
 218 }
 219
 220 static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
 221                                          struct mtk_dpi_yc_limit *limit)
 222 {
 223         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
 224                      Y_LIMINT_BOT_MASK);
 225         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
 226                      Y_LIMINT_TOP_MASK);
 227         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
 228                      C_LIMIT_BOT_MASK);
 229         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
 230                      C_LIMIT_TOP_MASK);
 231 }
 232
 233 static void mtk_dpi_config_bit_num(struct mtk_dpi *dpi,
 234                                    enum mtk_dpi_out_bit_num num)
 235 {
 236         u32 val;
 237
 238         switch (num) {
 239         case MTK_DPI_OUT_BIT_NUM_8BITS:
 240                 val = OUT_BIT_8;
 241                 break;
 242         case MTK_DPI_OUT_BIT_NUM_10BITS:
 243                 val = OUT_BIT_10;
 244                 break;
 245         case MTK_DPI_OUT_BIT_NUM_12BITS:
 246                 val = OUT_BIT_12;
 247                 break;
 248         case MTK_DPI_OUT_BIT_NUM_16BITS:
 249                 val = OUT_BIT_16;
 250                 break;
 251         default:
 252                 val = OUT_BIT_8;
 253                 break;
 254         }
 255         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << OUT_BIT,
 256                      OUT_BIT_MASK);
 257 }
 258
 259 static void mtk_dpi_config_yc_map(struct mtk_dpi *dpi,
 260                                   enum mtk_dpi_out_yc_map map)
 261 {
 262         u32 val;
 263
 264         switch (map) {
 265         case MTK_DPI_OUT_YC_MAP_RGB:
 266                 val = YC_MAP_RGB;
 267                 break;
 268         case MTK_DPI_OUT_YC_MAP_CYCY:
 269                 val = YC_MAP_CYCY;
 270                 break;
 271         case MTK_DPI_OUT_YC_MAP_YCYC:
 272                 val = YC_MAP_YCYC;
 273                 break;
 274         case MTK_DPI_OUT_YC_MAP_CY:
 275                 val = YC_MAP_CY;
 276                 break;
 277         case MTK_DPI_OUT_YC_MAP_YC:
 278                 val = YC_MAP_YC;
 279                 break;
 280         default:
 281                 val = YC_MAP_RGB;
 282                 break;
 283         }
 284
 285         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << YC_MAP, YC_MAP_MASK);
 286 }
 287
 288 static void mtk_dpi_config_channel_swap(struct mtk_dpi *dpi,
 289                                         enum mtk_dpi_out_channel_swap swap)
 290 {
 291         u32 val;
 292
 293         switch (swap) {
 294         case MTK_DPI_OUT_CHANNEL_SWAP_RGB:
 295                 val = SWAP_RGB;
 296                 break;
 297         case MTK_DPI_OUT_CHANNEL_SWAP_GBR:
 298                 val = SWAP_GBR;
 299                 break;
 300         case MTK_DPI_OUT_CHANNEL_SWAP_BRG:
 301                 val = SWAP_BRG;
 302                 break;
 303         case MTK_DPI_OUT_CHANNEL_SWAP_RBG:
 304                 val = SWAP_RBG;
 305                 break;
 306         case MTK_DPI_OUT_CHANNEL_SWAP_GRB:
 307                 val = SWAP_GRB;
 308                 break;
 309         case MTK_DPI_OUT_CHANNEL_SWAP_BGR:
 310                 val = SWAP_BGR;
 311                 break;
 312         default:
 313                 val = SWAP_RGB;
 314                 break;
 315         }
 316
 317         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP, CH_SWAP_MASK);
 318 }
 319
 320 static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool enable)
 321 {
 322         mtk_dpi_mask(dpi, DPI_CON, enable ? YUV422_EN : 0, YUV422_EN);
 323 }
 324
 325 static void mtk_dpi_config_csc_enable(struct mtk_dpi *dpi, bool enable)
 326 {
 327         mtk_dpi_mask(dpi, DPI_CON, enable ? CSC_ENABLE : 0, CSC_ENABLE);
 328 }
 329
 330 static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
 331 {
 332         mtk_dpi_mask(dpi, DPI_CON, enable ? IN_RB_SWAP : 0, IN_RB_SWAP);
 333 }
 334
 335 static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
 336 {
 337         mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
 338 }
 339
 340 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 341                                         enum mtk_dpi_out_color_format format)
 342 {
 343         /* only support RGB888 */
 344         mtk_dpi_config_yuv422_enable(dpi, false);
 345         mtk_dpi_config_csc_enable(dpi, false);
 346         mtk_dpi_config_swap_input(dpi, false);
 347         mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 348 }
 349
 350 static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 351 {
 352         dpi->power_ctl &= ~pctl;
 353
 354         if ((dpi->power_ctl & DPI_POWER_START) ||
 355             (dpi->power_ctl & DPI_POWER_ENABLE))
 356                 return;
 357
 358         if (!dpi->power_sta)
 359                 return;
 360
 361         mtk_dpi_disable(dpi);
 362         clk_disable_unprepare(dpi->pixel_clk);
 363         clk_disable_unprepare(dpi->engine_clk);
 364         dpi->power_sta = false;
 365 }
 366
 367 static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 368 {
 369         int ret;
 370
 371         dpi->power_ctl |= pctl;
 372
 373         if (!(dpi->power_ctl & DPI_POWER_START) &&
 374             !(dpi->power_ctl & DPI_POWER_ENABLE))
 375                 return 0;
 376
 377         if (dpi->power_sta)
 378                 return 0;
 379
 380         ret = clk_prepare_enable(dpi->engine_clk);
 381         if (ret) {
 382                 dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
 383                 goto err_eng;
 384         }
 385
 386         ret = clk_prepare_enable(dpi->pixel_clk);
 387         if (ret) {
 388                 dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
 389                 goto err_pixel;
 390         }
 391
 392         mtk_dpi_enable(dpi);
 393         dpi->power_sta = true;
 394         return 0;
 395
 396 err_pixel:
 397         clk_disable_unprepare(dpi->engine_clk);
 398 err_eng:
 399         dpi->power_ctl &= ~pctl;
 400         return ret;
 401 }
 402
 403 static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 404                                     struct drm_display_mode *mode)
 405 {
 406         struct mtk_dpi_yc_limit limit;
 407         struct mtk_dpi_polarities dpi_pol;
 408         struct mtk_dpi_sync_param hsync;
 409         struct mtk_dpi_sync_param vsync_lodd = { 0 };
 410         struct mtk_dpi_sync_param vsync_leven = { 0 };
 411         struct mtk_dpi_sync_param vsync_rodd = { 0 };
 412         struct mtk_dpi_sync_param vsync_reven = { 0 };
 413         unsigned long pix_rate;
 414         unsigned long pll_rate;
 415         unsigned int factor;
 416
 417         /* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
 418         pix_rate = 1000UL * mode->clock;
 419         if (mode->clock <= 27000)
 420                 factor = 16 * 3;
 421         else if (mode->clock <= 84000)
 422                 factor = 8 * 3;
 423         else if (mode->clock <= 167000)
 424                 factor = 4 * 3;
 425         else
 426                 factor = 2 * 3;
 427         pll_rate = pix_rate * factor;
 428
 429         dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
 430                 pll_rate, pix_rate);
 431
 432         clk_set_rate(dpi->tvd_clk, pll_rate);
 433         pll_rate = clk_get_rate(dpi->tvd_clk);
 434
 435         pix_rate = pll_rate / factor;
 436         clk_set_rate(dpi->pixel_clk, pix_rate);
 437         pix_rate = clk_get_rate(dpi->pixel_clk);
 438
 439         dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
 440                 pll_rate, pix_rate);
 441
 442         limit.c_bottom = 0x0010;
 443         limit.c_top = 0x0FE0;
 444         limit.y_bottom = 0x0010;
 445         limit.y_top = 0x0FE0;
 446
 447         dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 448         dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
 449         dpi_pol.hsync_pol = mode->flags & DRM_MODE_FLAG_PHSYNC ?
 450                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 451         dpi_pol.vsync_pol = mode->flags & DRM_MODE_FLAG_PVSYNC ?
 452                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 453
 454         hsync.sync_width = mode->hsync_end - mode->hsync_start;
 455         hsync.back_porch = mode->htotal - mode->hsync_end;
 456         hsync.front_porch = mode->hsync_start - mode->hdisplay;
 457         hsync.shift_half_line = false;
 458
 459         vsync_lodd.sync_width = mode->vsync_end - mode->vsync_start;
 460         vsync_lodd.back_porch = mode->vtotal - mode->vsync_end;
 461         vsync_lodd.front_porch = mode->vsync_start - mode->vdisplay;
 462         vsync_lodd.shift_half_line = false;
 463
 464         if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 465             mode->flags & DRM_MODE_FLAG_3D_MASK) {
 466                 vsync_leven = vsync_lodd;
 467                 vsync_rodd = vsync_lodd;
 468                 vsync_reven = vsync_lodd;
 469                 vsync_leven.shift_half_line = true;
 470                 vsync_reven.shift_half_line = true;
 471         } else if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 472                    !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 473                 vsync_leven = vsync_lodd;
 474                 vsync_leven.shift_half_line = true;
 475         } else if (!(mode->flags & DRM_MODE_FLAG_INTERLACE) &&
 476                    mode->flags & DRM_MODE_FLAG_3D_MASK) {
 477                 vsync_rodd = vsync_lodd;
 478         }
 479         mtk_dpi_sw_reset(dpi, true);
 480         mtk_dpi_config_pol(dpi, &dpi_pol);
 481
 482         mtk_dpi_config_hsync(dpi, &hsync);
 483         mtk_dpi_config_vsync_lodd(dpi, &vsync_lodd);
 484         mtk_dpi_config_vsync_rodd(dpi, &vsync_rodd);
 485         mtk_dpi_config_vsync_leven(dpi, &vsync_leven);
 486         mtk_dpi_config_vsync_reven(dpi, &vsync_reven);
 487
 488         mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
 489         mtk_dpi_config_interface(dpi, !!(mode->flags &
 490                                          DRM_MODE_FLAG_INTERLACE));
 491         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 492                 mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay / 2);
 493         else
 494                 mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay);
 495
 496         mtk_dpi_config_channel_limit(dpi, &limit);
 497         mtk_dpi_config_bit_num(dpi, dpi->bit_num);
 498         mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
 499         mtk_dpi_config_yc_map(dpi, dpi->yc_map);
 500         mtk_dpi_config_color_format(dpi, dpi->color_format);
 501         mtk_dpi_config_2n_h_fre(dpi);
 502         mtk_dpi_sw_reset(dpi, false);
 503
 504         return 0;
 505 }
 506
 507 static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
 508 {
 509         drm_encoder_cleanup(encoder);
 510 }
 511
 512 static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
 513         .destroy = mtk_dpi_encoder_destroy,
 514 };
 515
 516 static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
 517                                        const struct drm_display_mode *mode,
 518                                        struct drm_display_mode *adjusted_mode)
 519 {
 520         return true;
 521 }
 522
 523 static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
 524                                      struct drm_display_mode *mode,
 525                                      struct drm_display_mode *adjusted_mode)
 526 {
 527         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 528
 529         drm_mode_copy(&dpi->mode, adjusted_mode);
 530 }
 531
 532 static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
 533 {
 534         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 535
 536         mtk_dpi_power_off(dpi, DPI_POWER_ENABLE);
 537 }
 538
 539 static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
 540 {
 541         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 542
 543         mtk_dpi_power_on(dpi, DPI_POWER_ENABLE);
 544         mtk_dpi_set_display_mode(dpi, &dpi->mode);
 545 }
 546
 547 static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
 548                                 struct drm_crtc_state *crtc_state,
 549                                 struct drm_connector_state *conn_state)
 550 {
 551         return 0;
 552 }
 553
 554 static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
 555         .mode_fixup = mtk_dpi_encoder_mode_fixup,
 556         .mode_set = mtk_dpi_encoder_mode_set,
 557         .disable = mtk_dpi_encoder_disable,
 558         .enable = mtk_dpi_encoder_enable,
 559         .atomic_check = mtk_dpi_atomic_check,
 560 };
 561
 562 static void mtk_dpi_start(struct mtk_ddp_comp *comp)
 563 {
 564         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 565
 566         mtk_dpi_power_on(dpi, DPI_POWER_START);
 567 }
 568
 569 static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
 570 {
 571         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 572
 573         mtk_dpi_power_off(dpi, DPI_POWER_START);
 574 }
 575
 576 static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
 577         .start = mtk_dpi_start,
 578         .stop = mtk_dpi_stop,
 579 };
 580
 581 static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 582 {
 583         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 584         struct drm_device *drm_dev = data;
 585         int ret;
 586
 587         ret = mtk_ddp_comp_register(drm_dev, &dpi->ddp_comp);
 588         if (ret < 0) {
 589                 dev_err(dev, "Failed to register component %pOF: %d\n",
 590                         dev->of_node, ret);
 591                 return ret;
 592         }
 593
 594         ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
 595                                DRM_MODE_ENCODER_TMDS, NULL);
 596         if (ret) {
 597                 dev_err(dev, "Failed to initialize decoder: %d\n", ret);
 598                 goto err_unregister;
 599         }
 600         drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
 601
 602         /* Currently DPI0 is fixed to be driven by OVL1 */
 603         dpi->encoder.possible_crtcs = BIT(1);
 604
 605         ret = drm_bridge_attach(&dpi->encoder, dpi->bridge, NULL);
 606         if (ret) {
 607                 dev_err(dev, "Failed to attach bridge: %d\n", ret);
 608                 goto err_cleanup;
 609         }
 610
 611         dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
 612         dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
 613         dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
 614         dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
 615
 616         return 0;
 617
 618 err_cleanup:
 619         drm_encoder_cleanup(&dpi->encoder);
 620 err_unregister:
 621         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 622         return ret;
 623 }
 624
 625 static void mtk_dpi_unbind(struct device *dev, struct device *master,
 626                            void *data)
 627 {
 628         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 629         struct drm_device *drm_dev = data;
 630
 631         drm_encoder_cleanup(&dpi->encoder);
 632         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 633 }
 634
 635 static const struct component_ops mtk_dpi_component_ops = {
 636         .bind = mtk_dpi_bind,
 637         .unbind = mtk_dpi_unbind,
 638 };
 639
 640 static int mtk_dpi_probe(struct platform_device *pdev)
 641 {
 642         struct device *dev = &pdev->dev;
 643         struct mtk_dpi *dpi;
 644         struct resource *mem;
 645         struct device_node *bridge_node;
 646         int comp_id;
 647         int ret;
 648
 649         dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
 650         if (!dpi)
 651                 return -ENOMEM;
 652
 653         dpi->dev = dev;
 654
 655         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 656         dpi->regs = devm_ioremap_resource(dev, mem);
 657         if (IS_ERR(dpi->regs)) {
 658                 ret = PTR_ERR(dpi->regs);
 659                 dev_err(dev, "Failed to ioremap mem resource: %d\n", ret);
 660                 return ret;
 661         }
 662
 663         dpi->engine_clk = devm_clk_get(dev, "engine");
 664         if (IS_ERR(dpi->engine_clk)) {
 665                 ret = PTR_ERR(dpi->engine_clk);
 666                 dev_err(dev, "Failed to get engine clock: %d\n", ret);
 667                 return ret;
 668         }
 669
 670         dpi->pixel_clk = devm_clk_get(dev, "pixel");
 671         if (IS_ERR(dpi->pixel_clk)) {
 672                 ret = PTR_ERR(dpi->pixel_clk);
 673                 dev_err(dev, "Failed to get pixel clock: %d\n", ret);
 674                 return ret;
 675         }
 676
 677         dpi->tvd_clk = devm_clk_get(dev, "pll");
 678         if (IS_ERR(dpi->tvd_clk)) {
 679                 ret = PTR_ERR(dpi->tvd_clk);
 680                 dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
 681                 return ret;
 682         }
 683
 684         dpi->irq = platform_get_irq(pdev, 0);
 685         if (dpi->irq <= 0) {
 686                 dev_err(dev, "Failed to get irq: %d\n", dpi->irq);
 687                 return -EINVAL;
 688         }
 689
 690         bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
 691         if (!bridge_node)
 692                 return -ENODEV;
 693
 694         dev_info(dev, "Found bridge node: %pOF\n", bridge_node);
 695
 696         dpi->bridge = of_drm_find_bridge(bridge_node);
 697         of_node_put(bridge_node);
 698         if (!dpi->bridge)
 699                 return -EPROBE_DEFER;
 700
 701         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
 702         if (comp_id < 0) {
 703                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
 704                 return comp_id;
 705         }
 706
 707         ret = mtk_ddp_comp_init(dev, dev->of_node, &dpi->ddp_comp, comp_id,
 708                                 &mtk_dpi_funcs);
 709         if (ret) {
 710                 dev_err(dev, "Failed to initialize component: %d\n", ret);
 711                 return ret;
 712         }
 713
 714         platform_set_drvdata(pdev, dpi);
 715
 716         ret = component_add(dev, &mtk_dpi_component_ops);
 717         if (ret) {
 718                 dev_err(dev, "Failed to add component: %d\n", ret);
 719                 return ret;
 720         }
 721
 722         return 0;
 723 }
 724
 725 static int mtk_dpi_remove(struct platform_device *pdev)
 726 {
 727         component_del(&pdev->dev, &mtk_dpi_component_ops);
 728
 729         return 0;
 730 }
 731
 732 static const struct of_device_id mtk_dpi_of_ids[] = {
 733         { .compatible = "mediatek,mt8173-dpi", },
 734         {}
 735 };
 736
 737 struct platform_driver mtk_dpi_driver = {
 738         .probe = mtk_dpi_probe,
 739         .remove = mtk_dpi_remove,
 740         .driver = {
 741                 .name = "mediatek-dpi",
 742                 .of_match_table = mtk_dpi_of_ids,
 743         },
 744 };