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 #include <video/videomode.h>
  26
  27 #include "mtk_dpi_regs.h"
  28 #include "mtk_drm_ddp_comp.h"
  29
  30 enum mtk_dpi_out_bit_num {
  31         MTK_DPI_OUT_BIT_NUM_8BITS,
  32         MTK_DPI_OUT_BIT_NUM_10BITS,
  33         MTK_DPI_OUT_BIT_NUM_12BITS,
  34         MTK_DPI_OUT_BIT_NUM_16BITS
  35 };
  36
  37 enum mtk_dpi_out_yc_map {
  38         MTK_DPI_OUT_YC_MAP_RGB,
  39         MTK_DPI_OUT_YC_MAP_CYCY,
  40         MTK_DPI_OUT_YC_MAP_YCYC,
  41         MTK_DPI_OUT_YC_MAP_CY,
  42         MTK_DPI_OUT_YC_MAP_YC
  43 };
  44
  45 enum mtk_dpi_out_channel_swap {
  46         MTK_DPI_OUT_CHANNEL_SWAP_RGB,
  47         MTK_DPI_OUT_CHANNEL_SWAP_GBR,
  48         MTK_DPI_OUT_CHANNEL_SWAP_BRG,
  49         MTK_DPI_OUT_CHANNEL_SWAP_RBG,
  50         MTK_DPI_OUT_CHANNEL_SWAP_GRB,
  51         MTK_DPI_OUT_CHANNEL_SWAP_BGR
  52 };
  53
  54 enum mtk_dpi_out_color_format {
  55         MTK_DPI_COLOR_FORMAT_RGB
  56 };
  57
  58 struct mtk_dpi {
  59         struct mtk_ddp_comp ddp_comp;
  60         struct drm_encoder encoder;
  61         struct drm_bridge *bridge;
  62         void __iomem *regs;
  63         struct device *dev;
  64         struct clk *engine_clk;
  65         struct clk *pixel_clk;
  66         struct clk *tvd_clk;
  67         int irq;
  68         struct drm_display_mode mode;
  69         enum mtk_dpi_out_color_format color_format;
  70         enum mtk_dpi_out_yc_map yc_map;
  71         enum mtk_dpi_out_bit_num bit_num;
  72         enum mtk_dpi_out_channel_swap channel_swap;
  73         bool power_sta;
  74         u8 power_ctl;
  75 };
  76
  77 static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
  78 {
  79         return container_of(e, struct mtk_dpi, encoder);
  80 }
  81
  82 enum mtk_dpi_polarity {
  83         MTK_DPI_POLARITY_RISING,
  84         MTK_DPI_POLARITY_FALLING,
  85 };
  86
  87 enum mtk_dpi_power_ctl {
  88         DPI_POWER_START = BIT(0),
  89         DPI_POWER_ENABLE = BIT(1),
  90 };
  91
  92 struct mtk_dpi_polarities {
  93         enum mtk_dpi_polarity de_pol;
  94         enum mtk_dpi_polarity ck_pol;
  95         enum mtk_dpi_polarity hsync_pol;
  96         enum mtk_dpi_polarity vsync_pol;
  97 };
  98
  99 struct mtk_dpi_sync_param {
 100         u32 sync_width;
 101         u32 front_porch;
 102         u32 back_porch;
 103         bool shift_half_line;
 104 };
 105
 106 struct mtk_dpi_yc_limit {
 107         u16 y_top;
 108         u16 y_bottom;
 109         u16 c_top;
 110         u16 c_bottom;
 111 };
 112
 113 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
 114 {
 115         u32 tmp = readl(dpi->regs + offset) & ~mask;
 116
 117         tmp |= (val & mask);
 118         writel(tmp, dpi->regs + offset);
 119 }
 120
 121 static void mtk_dpi_sw_reset(struct mtk_dpi *dpi, bool reset)
 122 {
 123         mtk_dpi_mask(dpi, DPI_RET, reset ? RST : 0, RST);
 124 }
 125
 126 static void mtk_dpi_enable(struct mtk_dpi *dpi)
 127 {
 128         mtk_dpi_mask(dpi, DPI_EN, EN, EN);
 129 }
 130
 131 static void mtk_dpi_disable(struct mtk_dpi *dpi)
 132 {
 133         mtk_dpi_mask(dpi, DPI_EN, 0, EN);
 134 }
 135
 136 static void mtk_dpi_config_hsync(struct mtk_dpi *dpi,
 137                                  struct mtk_dpi_sync_param *sync)
 138 {
 139         mtk_dpi_mask(dpi, DPI_TGEN_HWIDTH,
 140                      sync->sync_width << HPW, HPW_MASK);
 141         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH,
 142                      sync->back_porch << HBP, HBP_MASK);
 143         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH, sync->front_porch << HFP,
 144                      HFP_MASK);
 145 }
 146
 147 static void mtk_dpi_config_vsync(struct mtk_dpi *dpi,
 148                                  struct mtk_dpi_sync_param *sync,
 149                                  u32 width_addr, u32 porch_addr)
 150 {
 151         mtk_dpi_mask(dpi, width_addr,
 152                      sync->sync_width << VSYNC_WIDTH_SHIFT,
 153                      VSYNC_WIDTH_MASK);
 154         mtk_dpi_mask(dpi, width_addr,
 155                      sync->shift_half_line << VSYNC_HALF_LINE_SHIFT,
 156                      VSYNC_HALF_LINE_MASK);
 157         mtk_dpi_mask(dpi, porch_addr,
 158                      sync->back_porch << VSYNC_BACK_PORCH_SHIFT,
 159                      VSYNC_BACK_PORCH_MASK);
 160         mtk_dpi_mask(dpi, porch_addr,
 161                      sync->front_porch << VSYNC_FRONT_PORCH_SHIFT,
 162                      VSYNC_FRONT_PORCH_MASK);
 163 }
 164
 165 static void mtk_dpi_config_vsync_lodd(struct mtk_dpi *dpi,
 166                                       struct mtk_dpi_sync_param *sync)
 167 {
 168         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH, DPI_TGEN_VPORCH);
 169 }
 170
 171 static void mtk_dpi_config_vsync_leven(struct mtk_dpi *dpi,
 172                                        struct mtk_dpi_sync_param *sync)
 173 {
 174         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_LEVEN,
 175                              DPI_TGEN_VPORCH_LEVEN);
 176 }
 177
 178 static void mtk_dpi_config_vsync_rodd(struct mtk_dpi *dpi,
 179                                       struct mtk_dpi_sync_param *sync)
 180 {
 181         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_RODD,
 182                              DPI_TGEN_VPORCH_RODD);
 183 }
 184
 185 static void mtk_dpi_config_vsync_reven(struct mtk_dpi *dpi,
 186                                        struct mtk_dpi_sync_param *sync)
 187 {
 188         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_REVEN,
 189                              DPI_TGEN_VPORCH_REVEN);
 190 }
 191
 192 static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
 193                                struct mtk_dpi_polarities *dpi_pol)
 194 {
 195         unsigned int pol;
 196
 197         pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) |
 198               (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) |
 199               (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
 200               (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
 201         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
 202                      CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
 203 }
 204
 205 static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
 206 {
 207         mtk_dpi_mask(dpi, DPI_CON, en_3d ? TDFP_EN : 0, TDFP_EN);
 208 }
 209
 210 static void mtk_dpi_config_interface(struct mtk_dpi *dpi, bool inter)
 211 {
 212         mtk_dpi_mask(dpi, DPI_CON, inter ? INTL_EN : 0, INTL_EN);
 213 }
 214
 215 static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
 216 {
 217         mtk_dpi_mask(dpi, DPI_SIZE, width << HSIZE, HSIZE_MASK);
 218         mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
 219 }
 220
 221 static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
 222                                          struct mtk_dpi_yc_limit *limit)
 223 {
 224         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
 225                      Y_LIMINT_BOT_MASK);
 226         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
 227                      Y_LIMINT_TOP_MASK);
 228         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
 229                      C_LIMIT_BOT_MASK);
 230         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
 231                      C_LIMIT_TOP_MASK);
 232 }
 233
 234 static void mtk_dpi_config_bit_num(struct mtk_dpi *dpi,
 235                                    enum mtk_dpi_out_bit_num num)
 236 {
 237         u32 val;
 238
 239         switch (num) {
 240         case MTK_DPI_OUT_BIT_NUM_8BITS:
 241                 val = OUT_BIT_8;
 242                 break;
 243         case MTK_DPI_OUT_BIT_NUM_10BITS:
 244                 val = OUT_BIT_10;
 245                 break;
 246         case MTK_DPI_OUT_BIT_NUM_12BITS:
 247                 val = OUT_BIT_12;
 248                 break;
 249         case MTK_DPI_OUT_BIT_NUM_16BITS:
 250                 val = OUT_BIT_16;
 251                 break;
 252         default:
 253                 val = OUT_BIT_8;
 254                 break;
 255         }
 256         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << OUT_BIT,
 257                      OUT_BIT_MASK);
 258 }
 259
 260 static void mtk_dpi_config_yc_map(struct mtk_dpi *dpi,
 261                                   enum mtk_dpi_out_yc_map map)
 262 {
 263         u32 val;
 264
 265         switch (map) {
 266         case MTK_DPI_OUT_YC_MAP_RGB:
 267                 val = YC_MAP_RGB;
 268                 break;
 269         case MTK_DPI_OUT_YC_MAP_CYCY:
 270                 val = YC_MAP_CYCY;
 271                 break;
 272         case MTK_DPI_OUT_YC_MAP_YCYC:
 273                 val = YC_MAP_YCYC;
 274                 break;
 275         case MTK_DPI_OUT_YC_MAP_CY:
 276                 val = YC_MAP_CY;
 277                 break;
 278         case MTK_DPI_OUT_YC_MAP_YC:
 279                 val = YC_MAP_YC;
 280                 break;
 281         default:
 282                 val = YC_MAP_RGB;
 283                 break;
 284         }
 285
 286         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << YC_MAP, YC_MAP_MASK);
 287 }
 288
 289 static void mtk_dpi_config_channel_swap(struct mtk_dpi *dpi,
 290                                         enum mtk_dpi_out_channel_swap swap)
 291 {
 292         u32 val;
 293
 294         switch (swap) {
 295         case MTK_DPI_OUT_CHANNEL_SWAP_RGB:
 296                 val = SWAP_RGB;
 297                 break;
 298         case MTK_DPI_OUT_CHANNEL_SWAP_GBR:
 299                 val = SWAP_GBR;
 300                 break;
 301         case MTK_DPI_OUT_CHANNEL_SWAP_BRG:
 302                 val = SWAP_BRG;
 303                 break;
 304         case MTK_DPI_OUT_CHANNEL_SWAP_RBG:
 305                 val = SWAP_RBG;
 306                 break;
 307         case MTK_DPI_OUT_CHANNEL_SWAP_GRB:
 308                 val = SWAP_GRB;
 309                 break;
 310         case MTK_DPI_OUT_CHANNEL_SWAP_BGR:
 311                 val = SWAP_BGR;
 312                 break;
 313         default:
 314                 val = SWAP_RGB;
 315                 break;
 316         }
 317
 318         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP, CH_SWAP_MASK);
 319 }
 320
 321 static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool enable)
 322 {
 323         mtk_dpi_mask(dpi, DPI_CON, enable ? YUV422_EN : 0, YUV422_EN);
 324 }
 325
 326 static void mtk_dpi_config_csc_enable(struct mtk_dpi *dpi, bool enable)
 327 {
 328         mtk_dpi_mask(dpi, DPI_CON, enable ? CSC_ENABLE : 0, CSC_ENABLE);
 329 }
 330
 331 static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
 332 {
 333         mtk_dpi_mask(dpi, DPI_CON, enable ? IN_RB_SWAP : 0, IN_RB_SWAP);
 334 }
 335
 336 static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
 337 {
 338         mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
 339 }
 340
 341 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 342                                         enum mtk_dpi_out_color_format format)
 343 {
 344         /* only support RGB888 */
 345         mtk_dpi_config_yuv422_enable(dpi, false);
 346         mtk_dpi_config_csc_enable(dpi, false);
 347         mtk_dpi_config_swap_input(dpi, false);
 348         mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 349 }
 350
 351 static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 352 {
 353         dpi->power_ctl &= ~pctl;
 354
 355         if ((dpi->power_ctl & DPI_POWER_START) ||
 356             (dpi->power_ctl & DPI_POWER_ENABLE))
 357                 return;
 358
 359         if (!dpi->power_sta)
 360                 return;
 361
 362         mtk_dpi_disable(dpi);
 363         clk_disable_unprepare(dpi->pixel_clk);
 364         clk_disable_unprepare(dpi->engine_clk);
 365         dpi->power_sta = false;
 366 }
 367
 368 static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 369 {
 370         int ret;
 371
 372         dpi->power_ctl |= pctl;
 373
 374         if (!(dpi->power_ctl & DPI_POWER_START) &&
 375             !(dpi->power_ctl & DPI_POWER_ENABLE))
 376                 return 0;
 377
 378         if (dpi->power_sta)
 379                 return 0;
 380
 381         ret = clk_prepare_enable(dpi->engine_clk);
 382         if (ret) {
 383                 dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
 384                 goto err_eng;
 385         }
 386
 387         ret = clk_prepare_enable(dpi->pixel_clk);
 388         if (ret) {
 389                 dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
 390                 goto err_pixel;
 391         }
 392
 393         mtk_dpi_enable(dpi);
 394         dpi->power_sta = true;
 395         return 0;
 396
 397 err_pixel:
 398         clk_disable_unprepare(dpi->engine_clk);
 399 err_eng:
 400         dpi->power_ctl &= ~pctl;
 401         return ret;
 402 }
 403
 404 static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 405                                     struct drm_display_mode *mode)
 406 {
 407         struct mtk_dpi_yc_limit limit;
 408         struct mtk_dpi_polarities dpi_pol;
 409         struct mtk_dpi_sync_param hsync;
 410         struct mtk_dpi_sync_param vsync_lodd = { 0 };
 411         struct mtk_dpi_sync_param vsync_leven = { 0 };
 412         struct mtk_dpi_sync_param vsync_rodd = { 0 };
 413         struct mtk_dpi_sync_param vsync_reven = { 0 };
 414         struct videomode vm = { 0 };
 415         unsigned long pll_rate;
 416         unsigned int factor;
 417
 418         /* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
 419
 420         if (mode->clock <= 27000)
 421                 factor = 3 << 4;
 422         else if (mode->clock <= 84000)
 423                 factor = 3 << 3;
 424         else if (mode->clock <= 167000)
 425                 factor = 3 << 2;
 426         else
 427                 factor = 3 << 1;
 428         drm_display_mode_to_videomode(mode, &vm);
 429         pll_rate = vm.pixelclock * factor;
 430
 431         dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
 432                 pll_rate, vm.pixelclock);
 433
 434         clk_set_rate(dpi->tvd_clk, pll_rate);
 435         pll_rate = clk_get_rate(dpi->tvd_clk);
 436
 437         vm.pixelclock = pll_rate / factor;
 438         clk_set_rate(dpi->pixel_clk, vm.pixelclock);
 439         vm.pixelclock = clk_get_rate(dpi->pixel_clk);
 440
 441         dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
 442                 pll_rate, vm.pixelclock);
 443
 444         limit.c_bottom = 0x0010;
 445         limit.c_top = 0x0FE0;
 446         limit.y_bottom = 0x0010;
 447         limit.y_top = 0x0FE0;
 448
 449         dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 450         dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
 451         dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 452                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 453         dpi_pol.vsync_pol = vm.flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 454                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 455         hsync.sync_width = vm.hsync_len;
 456         hsync.back_porch = vm.hback_porch;
 457         hsync.front_porch = vm.hfront_porch;
 458         hsync.shift_half_line = false;
 459         vsync_lodd.sync_width = vm.vsync_len;
 460         vsync_lodd.back_porch = vm.vback_porch;
 461         vsync_lodd.front_porch = vm.vfront_porch;
 462         vsync_lodd.shift_half_line = false;
 463
 464         if (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 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 (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 472                    !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 473                 vsync_leven = vsync_lodd;
 474                 vsync_leven.shift_half_line = true;
 475         } else if (!(vm.flags & DISPLAY_FLAGS_INTERLACED) &&
 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, !!(vm.flags &
 490                                          DISPLAY_FLAGS_INTERLACED));
 491         if (vm.flags & DISPLAY_FLAGS_INTERLACED)
 492                 mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive >> 1);
 493         else
 494                 mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);
 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 };