drivers/gpu/drm/mediatek/mtk_dpi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014 MediaTek Inc.
   4  * Author: Jie Qiu <jie.qiu@mediatek.com>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/component.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/kernel.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/types.h>
  16
  17 #include <video/videomode.h>
  18
  19 #include <drm/drm_atomic_helper.h>
  20 #include <drm/drm_bridge.h>
  21 #include <drm/drm_crtc.h>
  22 #include <drm/drm_of.h>
  23
  24 #include "mtk_dpi_regs.h"
  25 #include "mtk_drm_ddp_comp.h"
  26
  27 enum mtk_dpi_out_bit_num {
  28         MTK_DPI_OUT_BIT_NUM_8BITS,
  29         MTK_DPI_OUT_BIT_NUM_10BITS,
  30         MTK_DPI_OUT_BIT_NUM_12BITS,
  31         MTK_DPI_OUT_BIT_NUM_16BITS
  32 };
  33
  34 enum mtk_dpi_out_yc_map {
  35         MTK_DPI_OUT_YC_MAP_RGB,
  36         MTK_DPI_OUT_YC_MAP_CYCY,
  37         MTK_DPI_OUT_YC_MAP_YCYC,
  38         MTK_DPI_OUT_YC_MAP_CY,
  39         MTK_DPI_OUT_YC_MAP_YC
  40 };
  41
  42 enum mtk_dpi_out_channel_swap {
  43         MTK_DPI_OUT_CHANNEL_SWAP_RGB,
  44         MTK_DPI_OUT_CHANNEL_SWAP_GBR,
  45         MTK_DPI_OUT_CHANNEL_SWAP_BRG,
  46         MTK_DPI_OUT_CHANNEL_SWAP_RBG,
  47         MTK_DPI_OUT_CHANNEL_SWAP_GRB,
  48         MTK_DPI_OUT_CHANNEL_SWAP_BGR
  49 };
  50
  51 enum mtk_dpi_out_color_format {
  52         MTK_DPI_COLOR_FORMAT_RGB,
  53         MTK_DPI_COLOR_FORMAT_RGB_FULL,
  54         MTK_DPI_COLOR_FORMAT_YCBCR_444,
  55         MTK_DPI_COLOR_FORMAT_YCBCR_422,
  56         MTK_DPI_COLOR_FORMAT_XV_YCC,
  57         MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL,
  58         MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL
  59 };
  60
  61 struct mtk_dpi {
  62         struct mtk_ddp_comp ddp_comp;
  63         struct drm_encoder encoder;
  64         struct drm_bridge *bridge;
  65         void __iomem *regs;
  66         struct device *dev;
  67         struct clk *engine_clk;
  68         struct clk *pixel_clk;
  69         struct clk *tvd_clk;
  70         int irq;
  71         struct drm_display_mode mode;
  72         const struct mtk_dpi_conf *conf;
  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         int refcount;
  78 };
  79
  80 static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
  81 {
  82         return container_of(e, struct mtk_dpi, encoder);
  83 }
  84
  85 enum mtk_dpi_polarity {
  86         MTK_DPI_POLARITY_RISING,
  87         MTK_DPI_POLARITY_FALLING,
  88 };
  89
  90 struct mtk_dpi_polarities {
  91         enum mtk_dpi_polarity de_pol;
  92         enum mtk_dpi_polarity ck_pol;
  93         enum mtk_dpi_polarity hsync_pol;
  94         enum mtk_dpi_polarity vsync_pol;
  95 };
  96
  97 struct mtk_dpi_sync_param {
  98         u32 sync_width;
  99         u32 front_porch;
 100         u32 back_porch;
 101         bool shift_half_line;
 102 };
 103
 104 struct mtk_dpi_yc_limit {
 105         u16 y_top;
 106         u16 y_bottom;
 107         u16 c_top;
 108         u16 c_bottom;
 109 };
 110
 111 struct mtk_dpi_conf {
 112         unsigned int (*cal_factor)(int clock);
 113         u32 reg_h_fre_con;
 114         bool edge_sel_en;
 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->conf->reg_h_fre_con, H_FRE_2N, H_FRE_2N);
 343 }
 344
 345 static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
 346 {
 347         if (dpi->conf->edge_sel_en)
 348                 mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
 349 }
 350
 351 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 352                                         enum mtk_dpi_out_color_format format)
 353 {
 354         if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_444) ||
 355             (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
 356                 mtk_dpi_config_yuv422_enable(dpi, false);
 357                 mtk_dpi_config_csc_enable(dpi, true);
 358                 mtk_dpi_config_swap_input(dpi, false);
 359                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
 360         } else if ((format == MTK_DPI_COLOR_FORMAT_YCBCR_422) ||
 361                    (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
 362                 mtk_dpi_config_yuv422_enable(dpi, true);
 363                 mtk_dpi_config_csc_enable(dpi, true);
 364                 mtk_dpi_config_swap_input(dpi, true);
 365                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 366         } else {
 367                 mtk_dpi_config_yuv422_enable(dpi, false);
 368                 mtk_dpi_config_csc_enable(dpi, false);
 369                 mtk_dpi_config_swap_input(dpi, false);
 370                 mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
 371         }
 372 }
 373
 374 static void mtk_dpi_power_off(struct mtk_dpi *dpi)
 375 {
 376         if (WARN_ON(dpi->refcount == 0))
 377                 return;
 378
 379         if (--dpi->refcount != 0)
 380                 return;
 381
 382         mtk_dpi_disable(dpi);
 383         clk_disable_unprepare(dpi->pixel_clk);
 384         clk_disable_unprepare(dpi->engine_clk);
 385 }
 386
 387 static int mtk_dpi_power_on(struct mtk_dpi *dpi)
 388 {
 389         int ret;
 390
 391         if (++dpi->refcount != 1)
 392                 return 0;
 393
 394         ret = clk_prepare_enable(dpi->engine_clk);
 395         if (ret) {
 396                 dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
 397                 goto err_refcount;
 398         }
 399
 400         ret = clk_prepare_enable(dpi->pixel_clk);
 401         if (ret) {
 402                 dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
 403                 goto err_pixel;
 404         }
 405
 406         mtk_dpi_enable(dpi);
 407         return 0;
 408
 409 err_pixel:
 410         clk_disable_unprepare(dpi->engine_clk);
 411 err_refcount:
 412         dpi->refcount--;
 413         return ret;
 414 }
 415
 416 static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 417                                     struct drm_display_mode *mode)
 418 {
 419         struct mtk_dpi_yc_limit limit;
 420         struct mtk_dpi_polarities dpi_pol;
 421         struct mtk_dpi_sync_param hsync;
 422         struct mtk_dpi_sync_param vsync_lodd = { 0 };
 423         struct mtk_dpi_sync_param vsync_leven = { 0 };
 424         struct mtk_dpi_sync_param vsync_rodd = { 0 };
 425         struct mtk_dpi_sync_param vsync_reven = { 0 };
 426         struct videomode vm = { 0 };
 427         unsigned long pll_rate;
 428         unsigned int factor;
 429
 430         /* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
 431         factor = dpi->conf->cal_factor(mode->clock);
 432         drm_display_mode_to_videomode(mode, &vm);
 433         pll_rate = vm.pixelclock * factor;
 434
 435         dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
 436                 pll_rate, vm.pixelclock);
 437
 438         clk_set_rate(dpi->tvd_clk, pll_rate);
 439         pll_rate = clk_get_rate(dpi->tvd_clk);
 440
 441         vm.pixelclock = pll_rate / factor;
 442         clk_set_rate(dpi->pixel_clk, vm.pixelclock);
 443         vm.pixelclock = clk_get_rate(dpi->pixel_clk);
 444
 445         dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
 446                 pll_rate, vm.pixelclock);
 447
 448         limit.c_bottom = 0x0010;
 449         limit.c_top = 0x0FE0;
 450         limit.y_bottom = 0x0010;
 451         limit.y_top = 0x0FE0;
 452
 453         dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 454         dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
 455         dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 456                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 457         dpi_pol.vsync_pol = vm.flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 458                             MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
 459         hsync.sync_width = vm.hsync_len;
 460         hsync.back_porch = vm.hback_porch;
 461         hsync.front_porch = vm.hfront_porch;
 462         hsync.shift_half_line = false;
 463         vsync_lodd.sync_width = vm.vsync_len;
 464         vsync_lodd.back_porch = vm.vback_porch;
 465         vsync_lodd.front_porch = vm.vfront_porch;
 466         vsync_lodd.shift_half_line = false;
 467
 468         if (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 469             mode->flags & DRM_MODE_FLAG_3D_MASK) {
 470                 vsync_leven = vsync_lodd;
 471                 vsync_rodd = vsync_lodd;
 472                 vsync_reven = vsync_lodd;
 473                 vsync_leven.shift_half_line = true;
 474                 vsync_reven.shift_half_line = true;
 475         } else if (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 476                    !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 477                 vsync_leven = vsync_lodd;
 478                 vsync_leven.shift_half_line = true;
 479         } else if (!(vm.flags & DISPLAY_FLAGS_INTERLACED) &&
 480                    mode->flags & DRM_MODE_FLAG_3D_MASK) {
 481                 vsync_rodd = vsync_lodd;
 482         }
 483         mtk_dpi_sw_reset(dpi, true);
 484         mtk_dpi_config_pol(dpi, &dpi_pol);
 485
 486         mtk_dpi_config_hsync(dpi, &hsync);
 487         mtk_dpi_config_vsync_lodd(dpi, &vsync_lodd);
 488         mtk_dpi_config_vsync_rodd(dpi, &vsync_rodd);
 489         mtk_dpi_config_vsync_leven(dpi, &vsync_leven);
 490         mtk_dpi_config_vsync_reven(dpi, &vsync_reven);
 491
 492         mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
 493         mtk_dpi_config_interface(dpi, !!(vm.flags &
 494                                          DISPLAY_FLAGS_INTERLACED));
 495         if (vm.flags & DISPLAY_FLAGS_INTERLACED)
 496                 mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive >> 1);
 497         else
 498                 mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);
 499
 500         mtk_dpi_config_channel_limit(dpi, &limit);
 501         mtk_dpi_config_bit_num(dpi, dpi->bit_num);
 502         mtk_dpi_config_channel_swap(dpi, dpi->channel_swap);
 503         mtk_dpi_config_yc_map(dpi, dpi->yc_map);
 504         mtk_dpi_config_color_format(dpi, dpi->color_format);
 505         mtk_dpi_config_2n_h_fre(dpi);
 506         mtk_dpi_config_disable_edge(dpi);
 507         mtk_dpi_sw_reset(dpi, false);
 508
 509         return 0;
 510 }
 511
 512 static void mtk_dpi_encoder_destroy(struct drm_encoder *encoder)
 513 {
 514         drm_encoder_cleanup(encoder);
 515 }
 516
 517 static const struct drm_encoder_funcs mtk_dpi_encoder_funcs = {
 518         .destroy = mtk_dpi_encoder_destroy,
 519 };
 520
 521 static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
 522                                        const struct drm_display_mode *mode,
 523                                        struct drm_display_mode *adjusted_mode)
 524 {
 525         return true;
 526 }
 527
 528 static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
 529                                      struct drm_display_mode *mode,
 530                                      struct drm_display_mode *adjusted_mode)
 531 {
 532         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 533
 534         drm_mode_copy(&dpi->mode, adjusted_mode);
 535 }
 536
 537 static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
 538 {
 539         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 540
 541         mtk_dpi_power_off(dpi);
 542 }
 543
 544 static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
 545 {
 546         struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
 547
 548         mtk_dpi_power_on(dpi);
 549         mtk_dpi_set_display_mode(dpi, &dpi->mode);
 550 }
 551
 552 static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
 553                                 struct drm_crtc_state *crtc_state,
 554                                 struct drm_connector_state *conn_state)
 555 {
 556         return 0;
 557 }
 558
 559 static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
 560         .mode_fixup = mtk_dpi_encoder_mode_fixup,
 561         .mode_set = mtk_dpi_encoder_mode_set,
 562         .disable = mtk_dpi_encoder_disable,
 563         .enable = mtk_dpi_encoder_enable,
 564         .atomic_check = mtk_dpi_atomic_check,
 565 };
 566
 567 static void mtk_dpi_start(struct mtk_ddp_comp *comp)
 568 {
 569         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 570
 571         mtk_dpi_power_on(dpi);
 572 }
 573
 574 static void mtk_dpi_stop(struct mtk_ddp_comp *comp)
 575 {
 576         struct mtk_dpi *dpi = container_of(comp, struct mtk_dpi, ddp_comp);
 577
 578         mtk_dpi_power_off(dpi);
 579 }
 580
 581 static const struct mtk_ddp_comp_funcs mtk_dpi_funcs = {
 582         .start = mtk_dpi_start,
 583         .stop = mtk_dpi_stop,
 584 };
 585
 586 static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 587 {
 588         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 589         struct drm_device *drm_dev = data;
 590         int ret;
 591
 592         ret = mtk_ddp_comp_register(drm_dev, &dpi->ddp_comp);
 593         if (ret < 0) {
 594                 dev_err(dev, "Failed to register component %pOF: %d\n",
 595                         dev->of_node, ret);
 596                 return ret;
 597         }
 598
 599         ret = drm_encoder_init(drm_dev, &dpi->encoder, &mtk_dpi_encoder_funcs,
 600                                DRM_MODE_ENCODER_TMDS, NULL);
 601         if (ret) {
 602                 dev_err(dev, "Failed to initialize decoder: %d\n", ret);
 603                 goto err_unregister;
 604         }
 605         drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
 606
 607         /* Currently DPI0 is fixed to be driven by OVL1 */
 608         dpi->encoder.possible_crtcs = BIT(1);
 609
 610         ret = drm_bridge_attach(&dpi->encoder, dpi->bridge, NULL, 0);
 611         if (ret) {
 612                 dev_err(dev, "Failed to attach bridge: %d\n", ret);
 613                 goto err_cleanup;
 614         }
 615
 616         dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
 617         dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
 618         dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
 619         dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
 620
 621         return 0;
 622
 623 err_cleanup:
 624         drm_encoder_cleanup(&dpi->encoder);
 625 err_unregister:
 626         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 627         return ret;
 628 }
 629
 630 static void mtk_dpi_unbind(struct device *dev, struct device *master,
 631                            void *data)
 632 {
 633         struct mtk_dpi *dpi = dev_get_drvdata(dev);
 634         struct drm_device *drm_dev = data;
 635
 636         drm_encoder_cleanup(&dpi->encoder);
 637         mtk_ddp_comp_unregister(drm_dev, &dpi->ddp_comp);
 638 }
 639
 640 static const struct component_ops mtk_dpi_component_ops = {
 641         .bind = mtk_dpi_bind,
 642         .unbind = mtk_dpi_unbind,
 643 };
 644
 645 static unsigned int mt8173_calculate_factor(int clock)
 646 {
 647         if (clock <= 27000)
 648                 return 3 << 4;
 649         else if (clock <= 84000)
 650                 return 3 << 3;
 651         else if (clock <= 167000)
 652                 return 3 << 2;
 653         else
 654                 return 3 << 1;
 655 }
 656
 657 static unsigned int mt2701_calculate_factor(int clock)
 658 {
 659         if (clock <= 64000)
 660                 return 4;
 661         else if (clock <= 128000)
 662                 return 2;
 663         else
 664                 return 1;
 665 }
 666
 667 static unsigned int mt8183_calculate_factor(int clock)
 668 {
 669         if (clock <= 27000)
 670                 return 8;
 671         else if (clock <= 167000)
 672                 return 4;
 673         else
 674                 return 2;
 675 }
 676
 677 static const struct mtk_dpi_conf mt8173_conf = {
 678         .cal_factor = mt8173_calculate_factor,
 679         .reg_h_fre_con = 0xe0,
 680 };
 681
 682 static const struct mtk_dpi_conf mt2701_conf = {
 683         .cal_factor = mt2701_calculate_factor,
 684         .reg_h_fre_con = 0xb0,
 685         .edge_sel_en = true,
 686 };
 687
 688 static const struct mtk_dpi_conf mt8183_conf = {
 689         .cal_factor = mt8183_calculate_factor,
 690         .reg_h_fre_con = 0xe0,
 691 };
 692
 693 static int mtk_dpi_probe(struct platform_device *pdev)
 694 {
 695         struct device *dev = &pdev->dev;
 696         struct mtk_dpi *dpi;
 697         struct resource *mem;
 698         int comp_id;
 699         int ret;
 700
 701         dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
 702         if (!dpi)
 703                 return -ENOMEM;
 704
 705         dpi->dev = dev;
 706         dpi->conf = (struct mtk_dpi_conf *)of_device_get_match_data(dev);
 707
 708         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 709         dpi->regs = devm_ioremap_resource(dev, mem);
 710         if (IS_ERR(dpi->regs)) {
 711                 ret = PTR_ERR(dpi->regs);
 712                 dev_err(dev, "Failed to ioremap mem resource: %d\n", ret);
 713                 return ret;
 714         }
 715
 716         dpi->engine_clk = devm_clk_get(dev, "engine");
 717         if (IS_ERR(dpi->engine_clk)) {
 718                 ret = PTR_ERR(dpi->engine_clk);
 719                 dev_err(dev, "Failed to get engine clock: %d\n", ret);
 720                 return ret;
 721         }
 722
 723         dpi->pixel_clk = devm_clk_get(dev, "pixel");
 724         if (IS_ERR(dpi->pixel_clk)) {
 725                 ret = PTR_ERR(dpi->pixel_clk);
 726                 dev_err(dev, "Failed to get pixel clock: %d\n", ret);
 727                 return ret;
 728         }
 729
 730         dpi->tvd_clk = devm_clk_get(dev, "pll");
 731         if (IS_ERR(dpi->tvd_clk)) {
 732                 ret = PTR_ERR(dpi->tvd_clk);
 733                 dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
 734                 return ret;
 735         }
 736
 737         dpi->irq = platform_get_irq(pdev, 0);
 738         if (dpi->irq <= 0) {
 739                 dev_err(dev, "Failed to get irq: %d\n", dpi->irq);
 740                 return -EINVAL;
 741         }
 742
 743         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
 744                                           NULL, &dpi->bridge);
 745         if (ret)
 746                 return ret;
 747
 748         dev_info(dev, "Found bridge node: %pOF\n", dpi->bridge->of_node);
 749
 750         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DPI);
 751         if (comp_id < 0) {
 752                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
 753                 return comp_id;
 754         }
 755
 756         ret = mtk_ddp_comp_init(dev, dev->of_node, &dpi->ddp_comp, comp_id,
 757                                 &mtk_dpi_funcs);
 758         if (ret) {
 759                 dev_err(dev, "Failed to initialize component: %d\n", ret);
 760                 return ret;
 761         }
 762
 763         platform_set_drvdata(pdev, dpi);
 764
 765         ret = component_add(dev, &mtk_dpi_component_ops);
 766         if (ret) {
 767                 dev_err(dev, "Failed to add component: %d\n", ret);
 768                 return ret;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int mtk_dpi_remove(struct platform_device *pdev)
 775 {
 776         component_del(&pdev->dev, &mtk_dpi_component_ops);
 777
 778         return 0;
 779 }
 780
 781 static const struct of_device_id mtk_dpi_of_ids[] = {
 782         { .compatible = "mediatek,mt2701-dpi",
 783           .data = &mt2701_conf,
 784         },
 785         { .compatible = "mediatek,mt8173-dpi",
 786           .data = &mt8173_conf,
 787         },
 788         { .compatible = "mediatek,mt8183-dpi",
 789           .data = &mt8183_conf,
 790         },
 791         { },
 792 };
 793
 794 struct platform_driver mtk_dpi_driver = {
 795         .probe = mtk_dpi_probe,
 796         .remove = mtk_dpi_remove,
 797         .driver = {
 798                 .name = "mediatek-dpi",
 799                 .of_match_table = mtk_dpi_of_ids,
 800         },
 801 };