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         MTK_DPI_COLOR_FORMAT_RGB_FULL,
  56         MTK_DPI_COLOR_FORMAT_YCBCR_444,
  57         MTK_DPI_COLOR_FORMAT_YCBCR_422,
  58         MTK_DPI_COLOR_FORMAT_XV_YCC,
  59         MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL,
  60         MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
  61 };
  62
  63 struct mtk_dpi {
  64         struct mtk_ddp_comp ddp_comp;
  65         struct drm_encoder encoder;
  66         void __iomem *regs;
  67         struct device *dev;
  68         struct clk *engine_clk;
  69         struct clk *pixel_clk;
  70         struct clk *tvd_clk;
  71         int irq;
  72         struct drm_display_mode mode;
  73         enum mtk_dpi_out_color_format color_format;
  74         enum mtk_dpi_out_yc_map yc_map;
  75         enum mtk_dpi_out_bit_num bit_num;
  76         enum mtk_dpi_out_channel_swap channel_swap;
  77         bool power_sta;
  78         u8 power_ctl;
  79 };
  80
  81 static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
  82 {
  83         return container_of(e, struct mtk_dpi, encoder);
  84 }
  85
  86 enum mtk_dpi_polarity {
  87         MTK_DPI_POLARITY_RISING,
  88         MTK_DPI_POLARITY_FALLING,
  89 };
  90
  91 enum mtk_dpi_power_ctl {
  92         DPI_POWER_START = BIT(0),
  93         DPI_POWER_ENABLE = BIT(1),
  94 };
  95
  96 struct mtk_dpi_polarities {
  97         enum mtk_dpi_polarity de_pol;
  98         enum mtk_dpi_polarity ck_pol;
  99         enum mtk_dpi_polarity hsync_pol;
 100         enum mtk_dpi_polarity vsync_pol;
 101 };
 102
 103 struct mtk_dpi_sync_param {
 104         u32 sync_width;
 105         u32 front_porch;
 106         u32 back_porch;
 107         bool shift_half_line;
 108 };
 109
 110 struct mtk_dpi_yc_limit {
 111         u16 y_top;
 112         u16 y_bottom;
 113         u16 c_top;
 114         u16 c_bottom;
 115 };
 116
 117 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
 118 {
 119         u32 tmp = readl(dpi->regs + offset) & ~mask;
 120
 121         tmp |= (val & mask);
 122         writel(tmp, dpi->regs + offset);
 123 }
 124
 125 static void mtk_dpi_sw_reset(struct mtk_dpi *dpi, bool reset)
 126 {
 127         mtk_dpi_mask(dpi, DPI_RET, reset ? RST : 0, RST);
 128 }
 129
 130 static void mtk_dpi_enable(struct mtk_dpi *dpi)
 131 {
 132         mtk_dpi_mask(dpi, DPI_EN, EN, EN);
 133 }
 134
 135 static void mtk_dpi_disable(struct mtk_dpi *dpi)
 136 {
 137         mtk_dpi_mask(dpi, DPI_EN, 0, EN);
 138 }
 139
 140 static void mtk_dpi_config_hsync(struct mtk_dpi *dpi,
 141                                  struct mtk_dpi_sync_param *sync)
 142 {
 143         mtk_dpi_mask(dpi, DPI_TGEN_HWIDTH,
 144                      sync->sync_width << HPW, HPW_MASK);
 145         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH,
 146                      sync->back_porch << HBP, HBP_MASK);
 147         mtk_dpi_mask(dpi, DPI_TGEN_HPORCH, sync->front_porch << HFP,
 148                      HFP_MASK);
 149 }
 150
 151 static void mtk_dpi_config_vsync(struct mtk_dpi *dpi,
 152                                  struct mtk_dpi_sync_param *sync,
 153                                  u32 width_addr, u32 porch_addr)
 154 {
 155         mtk_dpi_mask(dpi, width_addr,
 156                      sync->sync_width << VSYNC_WIDTH_SHIFT,
 157                      VSYNC_WIDTH_MASK);
 158         mtk_dpi_mask(dpi, width_addr,
 159                      sync->shift_half_line << VSYNC_HALF_LINE_SHIFT,
 160                      VSYNC_HALF_LINE_MASK);
 161         mtk_dpi_mask(dpi, porch_addr,
 162                      sync->back_porch << VSYNC_BACK_PORCH_SHIFT,
 163                      VSYNC_BACK_PORCH_MASK);
 164         mtk_dpi_mask(dpi, porch_addr,
 165                      sync->front_porch << VSYNC_FRONT_PORCH_SHIFT,
 166                      VSYNC_FRONT_PORCH_MASK);
 167 }
 168
 169 static void mtk_dpi_config_vsync_lodd(struct mtk_dpi *dpi,
 170                                       struct mtk_dpi_sync_param *sync)
 171 {
 172         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH, DPI_TGEN_VPORCH);
 173 }
 174
 175 static void mtk_dpi_config_vsync_leven(struct mtk_dpi *dpi,
 176                                        struct mtk_dpi_sync_param *sync)
 177 {
 178         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_LEVEN,
 179                              DPI_TGEN_VPORCH_LEVEN);
 180 }
 181
 182 static void mtk_dpi_config_vsync_rodd(struct mtk_dpi *dpi,
 183                                       struct mtk_dpi_sync_param *sync)
 184 {
 185         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_RODD,
 186                              DPI_TGEN_VPORCH_RODD);
 187 }
 188
 189 static void mtk_dpi_config_vsync_reven(struct mtk_dpi *dpi,
 190                                        struct mtk_dpi_sync_param *sync)
 191 {
 192         mtk_dpi_config_vsync(dpi, sync, DPI_TGEN_VWIDTH_REVEN,
 193                              DPI_TGEN_VPORCH_REVEN);
 194 }
 195
 196 static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
 197                                struct mtk_dpi_polarities *dpi_pol)
 198 {
 199         unsigned int pol;
 200
 201         pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) |
 202               (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) |
 203               (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
 204               (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
 205         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
 206                      CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
 207 }
 208
 209 static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
 210 {
 211         mtk_dpi_mask(dpi, DPI_CON, en_3d ? TDFP_EN : 0, TDFP_EN);
 212 }
 213
 214 static void mtk_dpi_config_interface(struct mtk_dpi *dpi, bool inter)
 215 {
 216         mtk_dpi_mask(dpi, DPI_CON, inter ? INTL_EN : 0, INTL_EN);
 217 }
 218
 219 static void mtk_dpi_config_fb_size(struct mtk_dpi *dpi, u32 width, u32 height)
 220 {
 221         mtk_dpi_mask(dpi, DPI_SIZE, width << HSIZE, HSIZE_MASK);
 222         mtk_dpi_mask(dpi, DPI_SIZE, height << VSIZE, VSIZE_MASK);
 223 }
 224
 225 static void mtk_dpi_config_channel_limit(struct mtk_dpi *dpi,
 226                                          struct mtk_dpi_yc_limit *limit)
 227 {
 228         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_bottom << Y_LIMINT_BOT,
 229                      Y_LIMINT_BOT_MASK);
 230         mtk_dpi_mask(dpi, DPI_Y_LIMIT, limit->y_top << Y_LIMINT_TOP,
 231                      Y_LIMINT_TOP_MASK);
 232         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_bottom << C_LIMIT_BOT,
 233                      C_LIMIT_BOT_MASK);
 234         mtk_dpi_mask(dpi, DPI_C_LIMIT, limit->c_top << C_LIMIT_TOP,
 235                      C_LIMIT_TOP_MASK);
 236 }
 237
 238 static void mtk_dpi_config_bit_num(struct mtk_dpi *dpi,
 239                                    enum mtk_dpi_out_bit_num num)
 240 {
 241         u32 val;
 242
 243         switch (num) {
 244         case MTK_DPI_OUT_BIT_NUM_8BITS:
 245                 val = OUT_BIT_8;
 246                 break;
 247         case MTK_DPI_OUT_BIT_NUM_10BITS:
 248                 val = OUT_BIT_10;
 249                 break;
 250         case MTK_DPI_OUT_BIT_NUM_12BITS:
 251                 val = OUT_BIT_12;
 252                 break;
 253         case MTK_DPI_OUT_BIT_NUM_16BITS:
 254                 val = OUT_BIT_16;
 255                 break;
 256         default:
 257                 val = OUT_BIT_8;
 258                 break;
 259         }
 260         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << OUT_BIT,
 261                      OUT_BIT_MASK);
 262 }
 263
 264 static void mtk_dpi_config_yc_map(struct mtk_dpi *dpi,
 265                                   enum mtk_dpi_out_yc_map map)
 266 {
 267         u32 val;
 268
 269         switch (map) {
 270         case MTK_DPI_OUT_YC_MAP_RGB:
 271                 val = YC_MAP_RGB;
 272                 break;
 273         case MTK_DPI_OUT_YC_MAP_CYCY:
 274                 val = YC_MAP_CYCY;
 275                 break;
 276         case MTK_DPI_OUT_YC_MAP_YCYC:
 277                 val = YC_MAP_YCYC;
 278                 break;
 279         case MTK_DPI_OUT_YC_MAP_CY:
 280                 val = YC_MAP_CY;
 281                 break;
 282         case MTK_DPI_OUT_YC_MAP_YC:
 283                 val = YC_MAP_YC;
 284                 break;
 285         default:
 286                 val = YC_MAP_RGB;
 287                 break;
 288         }
 289
 290         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << YC_MAP, YC_MAP_MASK);
 291 }
 292
 293 static void mtk_dpi_config_channel_swap(struct mtk_dpi *dpi,
 294                                         enum mtk_dpi_out_channel_swap swap)
 295 {
 296         u32 val;
 297
 298         switch (swap) {
 299         case MTK_DPI_OUT_CHANNEL_SWAP_RGB:
 300                 val = SWAP_RGB;
 301                 break;
 302         case MTK_DPI_OUT_CHANNEL_SWAP_GBR:
 303                 val = SWAP_GBR;
 304                 break;
 305         case MTK_DPI_OUT_CHANNEL_SWAP_BRG:
 306                 val = SWAP_BRG;
 307                 break;
 308         case MTK_DPI_OUT_CHANNEL_SWAP_RBG:
 309                 val = SWAP_RBG;
 310                 break;
 311         case MTK_DPI_OUT_CHANNEL_SWAP_GRB:
 312                 val = SWAP_GRB;
 313                 break;
 314         case MTK_DPI_OUT_CHANNEL_SWAP_BGR:
 315                 val = SWAP_BGR;
 316                 break;
 317         default:
 318                 val = SWAP_RGB;
 319                 break;
 320         }
 321
 322         mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, val << CH_SWAP, CH_SWAP_MASK);
 323 }
 324
 325 static void mtk_dpi_config_yuv422_enable(struct mtk_dpi *dpi, bool enable)
 326 {
 327         mtk_dpi_mask(dpi, DPI_CON, enable ? YUV422_EN : 0, YUV422_EN);
 328 }
 329
 330 static void mtk_dpi_config_csc_enable(struct mtk_dpi *dpi, bool enable)
 331 {
 332         mtk_dpi_mask(dpi, DPI_CON, enable ? CSC_ENABLE : 0, CSC_ENABLE);
 333 }
 334
 335 static void mtk_dpi_config_swap_input(struct mtk_dpi *dpi, bool enable)
 336 {
 337         mtk_dpi_mask(dpi, DPI_CON, enable ? IN_RB_SWAP : 0, IN_RB_SWAP);
 338 }
 339
 340 static void mtk_dpi_config_2n_h_fre(struct mtk_dpi *dpi)
 341 {
 342         mtk_dpi_mask(dpi, DPI_H_FRE_CON, H_FRE_2N, H_FRE_2N);
 343 }
 344
 345 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 346                                         enum mtk_dpi_out_color_format format)
 347 {
 348         if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_444) ||
 349             (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
 350                 mtk_dpi_config_yuv422_enable(dpi, false);
 351                 mtk_dpi_config_csc_enable(dpi, true);
 352                 mtk_dpi_config_swap_input(dpi, false);
 353                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
 354         } else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) ||
 355                    (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
 356                 mtk_dpi_config_yuv422_enable(dpi, true);
 357                 mtk_dpi_config_csc_enable(dpi, true);
 358                 mtk_dpi_config_swap_input(dpi, true);
 359                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 360         } else {
 361                 mtk_dpi_config_yuv422_enable(dpi, false);
 362                 mtk_dpi_config_csc_enable(dpi, false);
 363                 mtk_dpi_config_swap_input(dpi, false);
 364                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 365         }
 366 }
 367
 368 static void mtk_dpi_power_off(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 369 {
 370         dpi->power_ctl &= ~pctl;
 371
 372         if ((dpi->power_ctl & DPI_POWER_START) ||
 373             (dpi->power_ctl & DPI_POWER_ENABLE))
 374                 return;
 375
 376         if (!dpi->power_sta)
 377                 return;
 378
 379         mtk_dpi_disable(dpi);
 380         clk_disable_unprepare(dpi->pixel_clk);
 381         clk_disable_unprepare(dpi->engine_clk);
 382         dpi->power_sta = false;
 383 }
 384
 385 static int mtk_dpi_power_on(struct mtk_dpi *dpi, enum mtk_dpi_power_ctl pctl)
 386 {
 387         int ret;
 388
 389         dpi->power_ctl |= pctl;
 390
 391         if (!(dpi->power_ctl & DPI_POWER_START) &&
 392             !(dpi->power_ctl & DPI_POWER_ENABLE))
 393                 return 0;
 394
 395         if (dpi->power_sta)
 396                 return 0;
 397
 398         ret = clk_prepare_enable(dpi->engine_clk);
 399         if (ret) {
 400                 dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
 401                 goto err_eng;
 402         }
 403
 404         ret = clk_prepare_enable(dpi->pixel_clk);
 405         if (ret) {
 406                 dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
 407                 goto err_pixel;
 408         }
 409
 410         mtk_dpi_enable(dpi);
 411         dpi->power_sta = true;
 412         return 0;
 413
 414 err_pixel:
 415         clk_disable_unprepare(dpi->engine_clk);
 416 err_eng:
 417         dpi->power_ctl &= ~pctl;
 418         return ret;
 419 }
 420
 421 static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 422                                     struct drm_display_mode *mode)
 423 {
 424         struct mtk_dpi_yc_limit limit;
 425         struct mtk_dpi_polarities dpi_pol;
 426         struct mtk_dpi_sync_param hsync;
 427         struct mtk_dpi_sync_param vsync_lodd = { 0 };
 428         struct mtk_dpi_sync_param vsync_leven = { 0 };
 429         struct mtk_dpi_sync_param vsync_rodd = { 0 };
 430         struct mtk_dpi_sync_param vsync_reven = { 0 };
 431         unsigned long pix_rate;
 432         unsigned long pll_rate;
 433         unsigned int factor;
 434
 435         pix_rate = 1000UL * mode->clock;
 436         if (mode->clock <= 74000)
 437                 factor = 8 * 3;
 438         else
 439                 factor = 4 * 3;
 440         pll_rate = pix_rate * factor;
 441
 442         dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
 443                 pll_rate, pix_rate);
 444
 445         clk_set_rate(dpi->tvd_clk, pll_rate);
 446         pll_rate = clk_get_rate(dpi->tvd_clk);
 447
 448         pix_rate = pll_rate / factor;
 449         clk_set_rate(dpi->pixel_clk, pix_rate);
 450         pix_rate = clk_get_rate(dpi->pixel_clk);
 451
 452         dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
 453                 pll_rate, pix_rate);
 454
 455         limit.c_bottom = 0x0010;
 456         limit.c_top = 0x0FE0;
 457         limit.y_bottom = 0x0010;
 458         limit.y_top = 0x0FE0;
 459
 460         dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 461         dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
 462         dpi_pol.hsync_pol = mode->flags & DRM_MODE_FLAG_PHSYNC ?
 463                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 464         dpi_pol.vsync_pol = mode->flags & DRM_MODE_FLAG_PVSYNC ?
 465                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 466
 467         hsync.sync_width = mode->hsync_end - mode->hsync_start;
 468         hsync.back_porch = mode->htotal - mode->hsync_end;
 469         hsync.front_porch = mode->hsync_start - mode->hdisplay;
 470         hsync.shift_half_line = false;
 471
 472         vsync_lodd.sync_width = mode->vsync_end - mode->vsync_start;
 473         vsync_lodd.back_porch = mode->vtotal - mode->vsync_end;
 474         vsync_lodd.front_porch = mode->vsync_start - mode->vdisplay;
 475         vsync_lodd.shift_half_line = false;
 476
 477         if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 478             mode->flags & DRM_MODE_FLAG_3D_MASK) {
 479                 vsync_leven = vsync_lodd;
 480                 vsync_rodd = vsync_lodd;
 481                 vsync_reven = vsync_lodd;
 482                 vsync_leven.shift_half_line = true;
 483                 vsync_reven.shift_half_line = true;
 484         } else if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
 485                    !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 486                 vsync_leven = vsync_lodd;
 487                 vsync_leven.shift_half_line = true;
 488         } else if (!(mode->flags & DRM_MODE_FLAG_INTERLACE) &&
 489                    mode->flags & DRM_MODE_FLAG_3D_MASK) {
 490                 vsync_rodd = vsync_lodd;
 491         }
 492         mtk_dpi_sw_reset(dpi, true);
 493         mtk_dpi_config_pol(dpi, &dpi_pol);
 494
 495         mtk_dpi_config_hsync(dpi, &hsync);
 496         mtk_dpi_config_vsync_lodd(dpi, &vsync_lodd);
 497         mtk_dpi_config_vsync_rodd(dpi, &vsync_rodd);
 498         mtk_dpi_config_vsync_leven(dpi, &vsync_leven);
 499         mtk_dpi_config_vsync_reven(dpi, &vsync_reven);
 500
 501         mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
 502         mtk_dpi_config_interface(dpi, !!(mode->flags &
 503                                          DRM_MODE_FLAG_INTERLACE));
 504         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 505                 mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay / 2);
 506         else
 507                 mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay);
 508
 509         mtk_dpi_config_channel_limit(dpi, &limit);
 510         mtk_dpi_config_bit_num(dpi, dpi->bit_num);
 511         mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
 512         mtk_dpi_config_yc_map(dpi, dpi->yc_map);
 513         mtk_dpi_config_color_format(dpi, dpi->color_format);
 514         mtk_dpi_config_2n_h_fre(dpi);
 515         mtk_dpi_sw_reset(dpi, false);
 516
 517         return 0;
 518 }
 519
 520 static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
 521 {
 522         drm_encoder_cleanup(encoder);
 523 }
 524
 525 static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
 526         .destroy = mtk_dpi_encoder_destroy,
 527 };
 528
 529 static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
 530                                        const struct drm_display_mode *mode,
 531                                        struct drm_display_mode *adjusted_mode)
 532 {
 533         return true;
 534 }
 535
 536 static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
 537                                      struct drm_display_mode *mode,
 538                                      struct drm_display_mode *adjusted_mode)
 539 {
 540         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 541
 542         drm_mode_copy(&dpi->mode, adjusted_mode);
 543 }
 544
 545 static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
 546 {
 547         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 548
 549         mtk_dpi_power_off(dpi, DPI_POWER_ENABLE);
 550 }
 551
 552 static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
 553 {
 554         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 555
 556         mtk_dpi_power_on(dpi, DPI_POWER_ENABLE);
 557         mtk_dpi_set_display_mode(dpi, &dpi->mode);
 558 }
 559
 560 static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
 561                                 struct drm_crtc_state *crtc_state,
 562                                 struct drm_connector_state *conn_state)
 563 {
 564         return 0;
 565 }
 566
 567 static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
 568         .mode_fixup = mtk_dpi_encoder_mode_fixup,
 569         .mode_set = mtk_dpi_encoder_mode_set,
 570         .disable = mtk_dpi_encoder_disable,
 571         .enable = mtk_dpi_encoder_enable,
 572         .atomic_check = mtk_dpi_atomic_check,
 573 };
 574
 575 static void mtk_dpi_start(struct mtk_ddp_comp *comp)
 576 {
 577         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 578
 579         mtk_dpi_power_on(dpi, DPI_POWER_START);
 580 }
 581
 582 static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
 583 {
 584         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 585
 586         mtk_dpi_power_off(dpi, DPI_POWER_START);
 587 }
 588
 589 static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
 590         .start = mtk_dpi_start,
 591         .stop = mtk_dpi_stop,
 592 };
 593
 594 static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 595 {
 596         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 597         struct drm_device *drm_dev = data;
 598         int ret;
 599
 600         ret = mtk_ddp_comp_register(drm_dev, &dpi->ddp_comp);
 601         if (ret < 0) {
 602                 dev_err(dev, "Failed to register component %s: %d\n",
 603                         dev->of_node->full_name, ret);
 604                 return ret;
 605         }
 606
 607         ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
 608                                DRM_MODE_ENCODER_TMDS, NULL);
 609         if (ret) {
 610                 dev_err(dev, "Failed to initialize decoder: %d\n", ret);
 611                 goto err_unregister;
 612         }
 613         drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
 614
 615         /* Currently DPI0 is fixed to be driven by OVL1 */
 616         dpi->encoder.possible_crtcs = BIT(1);
 617
 618         dpi->encoder.bridge->encoder = &dpi->encoder;
 619         ret = drm_bridge_attach(dpi->encoder.dev, dpi->encoder.bridge);
 620         if (ret) {
 621                 dev_err(dev, "Failed to attach bridge: %d\n", ret);
 622                 goto err_cleanup;
 623         }
 624
 625         dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
 626         dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
 627         dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
 628         dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
 629
 630         return 0;
 631
 632 err_cleanup:
 633         drm_encoder_cleanup(&dpi->encoder);
 634 err_unregister:
 635         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 636         return ret;
 637 }
 638
 639 static void mtk_dpi_unbind(struct device *dev, struct device *master,
 640                            void *data)
 641 {
 642         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 643         struct drm_device *drm_dev = data;
 644
 645         drm_encoder_cleanup(&dpi->encoder);
 646         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 647 }
 648
 649 static const struct component_ops mtk_dpi_component_ops = {
 650         .bind = mtk_dpi_bind,
 651         .unbind = mtk_dpi_unbind,
 652 };
 653
 654 static int mtk_dpi_probe(struct platform_device *pdev)
 655 {
 656         struct device *dev = &pdev->dev;
 657         struct mtk_dpi *dpi;
 658         struct resource *mem;
 659         struct device_node *ep, *bridge_node = NULL;
 660         int comp_id;
 661         int ret;
 662
 663         dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
 664         if (!dpi)
 665                 return -ENOMEM;
 666
 667         dpi->dev = dev;
 668
 669         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 670         dpi->regs = devm_ioremap_resource(dev, mem);
 671         if (IS_ERR(dpi->regs)) {
 672                 ret = PTR_ERR(dpi->regs);
 673                 dev_err(dev, "Failed to ioremap mem resource: %d\n", ret);
 674                 return ret;
 675         }
 676
 677         dpi->engine_clk = devm_clk_get(dev, "engine");
 678         if (IS_ERR(dpi->engine_clk)) {
 679                 ret = PTR_ERR(dpi->engine_clk);
 680                 dev_err(dev, "Failed to get engine clock: %d\n", ret);
 681                 return ret;
 682         }
 683
 684         dpi->pixel_clk = devm_clk_get(dev, "pixel");
 685         if (IS_ERR(dpi->pixel_clk)) {
 686                 ret = PTR_ERR(dpi->pixel_clk);
 687                 dev_err(dev, "Failed to get pixel clock: %d\n", ret);
 688                 return ret;
 689         }
 690
 691         dpi->tvd_clk = devm_clk_get(dev, "pll");
 692         if (IS_ERR(dpi->tvd_clk)) {
 693                 ret = PTR_ERR(dpi->tvd_clk);
 694                 dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
 695                 return ret;
 696         }
 697
 698         dpi->irq = platform_get_irq(pdev, 0);
 699         if (dpi->irq <= 0) {
 700                 dev_err(dev, "Failed to get irq: %d\n", dpi->irq);
 701                 return -EINVAL;
 702         }
 703
 704         ep = of_graph_get_next_endpoint(dev->of_node, NULL);
 705         if (ep) {
 706                 bridge_node = of_graph_get_remote_port_parent(ep);
 707                 of_node_put(ep);
 708         }
 709         if (!bridge_node) {
 710                 dev_err(dev, "Failed to find bridge node\n");
 711                 return -ENODEV;
 712         }
 713
 714         dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);
 715
 716         dpi->encoder.bridge = of_drm_find_bridge(bridge_node);
 717         of_node_put(bridge_node);
 718         if (!dpi->encoder.bridge)
 719                 return -EPROBE_DEFER;
 720
 721         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
 722         if (comp_id < 0) {
 723                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
 724                 return comp_id;
 725         }
 726
 727         ret = mtk_ddp_comp_init(dev, dev->of_node, &dpi->ddp_comp, comp_id,
 728                                 &mtk_dpi_funcs);
 729         if (ret) {
 730                 dev_err(dev, "Failed to initialize component: %d\n", ret);
 731                 return ret;
 732         }
 733
 734         platform_set_drvdata(pdev, dpi);
 735
 736         ret = component_add(dev, &mtk_dpi_component_ops);
 737         if (ret) {
 738                 dev_err(dev, "Failed to add component: %d\n", ret);
 739                 return ret;
 740         }
 741
 742         return 0;
 743 }
 744
 745 static int mtk_dpi_remove(struct platform_device *pdev)
 746 {
 747         component_del(&pdev->dev, &mtk_dpi_component_ops);
 748
 749         return 0;
 750 }
 751
 752 static const struct of_device_id mtk_dpi_of_ids[] = {
 753         { .compatible = "mediatek,mt8173-dpi", },
 754         {}
 755 };
 756
 757 struct platform_driver mtk_dpi_driver = {
 758         .probe = mtk_dpi_probe,
 759         .remove = mtk_dpi_remove,
 760         .driver = {
 761                 .name = "mediatek-dpi",
 762                 .of_match_table = mtk_dpi_of_ids,
 763         },
 764 };