drivers/gpu/drm/mediatek/mtk_dsi.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <drm/drmP.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_mipi_dsi.h>
  18 #include <drm/drm_panel.h>
  19 #include <linux/clk.h>
  20 #include <linux/component.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/of_graph.h>
  24 #include <linux/phy/phy.h>
  25 #include <linux/platform_device.h>
  26 #include <video/videomode.h>
  27
  28 #include "mtk_drm_ddp_comp.h"
  29
  30 #define DSI_VIDEO_FIFO_DEPTH    (1920 / 4)
  31 #define DSI_HOST_FIFO_DEPTH     64
  32
  33 #define DSI_START               0x00
  34
  35 #define DSI_CON_CTRL            0x10
  36 #define DSI_RESET                       BIT(0)
  37 #define DSI_EN                          BIT(1)
  38
  39 #define DSI_MODE_CTRL           0x14
  40 #define MODE                            (3)
  41 #define CMD_MODE                        0
  42 #define SYNC_PULSE_MODE                 1
  43 #define SYNC_EVENT_MODE                 2
  44 #define BURST_MODE                      3
  45 #define FRM_MODE                        BIT(16)
  46 #define MIX_MODE                        BIT(17)
  47
  48 #define DSI_TXRX_CTRL           0x18
  49 #define VC_NUM                          (2 << 0)
  50 #define LANE_NUM                        (0xf << 2)
  51 #define DIS_EOT                         BIT(6)
  52 #define NULL_EN                         BIT(7)
  53 #define TE_FREERUN                      BIT(8)
  54 #define EXT_TE_EN                       BIT(9)
  55 #define EXT_TE_EDGE                     BIT(10)
  56 #define MAX_RTN_SIZE                    (0xf << 12)
  57 #define HSTX_CKLP_EN                    BIT(16)
  58
  59 #define DSI_PSCTRL              0x1c
  60 #define DSI_PS_WC                       0x3fff
  61 #define DSI_PS_SEL                      (3 << 16)
  62 #define PACKED_PS_16BIT_RGB565          (0 << 16)
  63 #define LOOSELY_PS_18BIT_RGB666         (1 << 16)
  64 #define PACKED_PS_18BIT_RGB666          (2 << 16)
  65 #define PACKED_PS_24BIT_RGB888          (3 << 16)
  66
  67 #define DSI_VSA_NL              0x20
  68 #define DSI_VBP_NL              0x24
  69 #define DSI_VFP_NL              0x28
  70 #define DSI_VACT_NL             0x2C
  71 #define DSI_HSA_WC              0x50
  72 #define DSI_HBP_WC              0x54
  73 #define DSI_HFP_WC              0x58
  74
  75 #define DSI_HSTX_CKL_WC         0x64
  76
  77 #define DSI_PHY_LCCON           0x104
  78 #define LC_HS_TX_EN                     BIT(0)
  79 #define LC_ULPM_EN                      BIT(1)
  80 #define LC_WAKEUP_EN                    BIT(2)
  81
  82 #define DSI_PHY_LD0CON          0x108
  83 #define LD0_HS_TX_EN                    BIT(0)
  84 #define LD0_ULPM_EN                     BIT(1)
  85 #define LD0_WAKEUP_EN                   BIT(2)
  86
  87 #define DSI_PHY_TIMECON0        0x110
  88 #define LPX                             (0xff << 0)
  89 #define HS_PRPR                         (0xff << 8)
  90 #define HS_ZERO                         (0xff << 16)
  91 #define HS_TRAIL                        (0xff << 24)
  92
  93 #define DSI_PHY_TIMECON1        0x114
  94 #define TA_GO                           (0xff << 0)
  95 #define TA_SURE                         (0xff << 8)
  96 #define TA_GET                          (0xff << 16)
  97 #define DA_HS_EXIT                      (0xff << 24)
  98
  99 #define DSI_PHY_TIMECON2        0x118
 100 #define CONT_DET                        (0xff << 0)
 101 #define CLK_ZERO                        (0xff << 16)
 102 #define CLK_TRAIL                       (0xff << 24)
 103
 104 #define DSI_PHY_TIMECON3        0x11c
 105 #define CLK_HS_PRPR                     (0xff << 0)
 106 #define CLK_HS_POST                     (0xff << 8)
 107 #define CLK_HS_EXIT                     (0xff << 16)
 108
 109 #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
 110
 111 struct phy;
 112
 113 struct mtk_dsi {
 114         struct mtk_ddp_comp ddp_comp;
 115         struct device *dev;
 116         struct mipi_dsi_host host;
 117         struct drm_encoder encoder;
 118         struct drm_connector conn;
 119         struct drm_panel *panel;
 120         struct drm_bridge *bridge;
 121         struct phy *phy;
 122
 123         void __iomem *regs;
 124
 125         struct clk *engine_clk;
 126         struct clk *digital_clk;
 127         struct clk *hs_clk;
 128
 129         u32 data_rate;
 130
 131         unsigned long mode_flags;
 132         enum mipi_dsi_pixel_format format;
 133         unsigned int lanes;
 134         struct videomode vm;
 135         int refcount;
 136         bool enabled;
 137 };
 138
 139 static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
 140 {
 141         return container_of(e, struct mtk_dsi, encoder);
 142 }
 143
 144 static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
 145 {
 146         return container_of(c, struct mtk_dsi, conn);
 147 }
 148
 149 static inline struct mtk_dsi *host_to_dsi(struct mipi_dsi_host *h)
 150 {
 151         return container_of(h, struct mtk_dsi, host);
 152 }
 153
 154 static void mtk_dsi_mask(struct mtk_dsi *dsi, u32 offset, u32 mask, u32 data)
 155 {
 156         u32 temp = readl(dsi->regs + offset);
 157
 158         writel((temp & ~mask) | (data & mask), dsi->regs + offset);
 159 }
 160
 161 static void dsi_phy_timconfig(struct mtk_dsi *dsi)
 162 {
 163         u32 timcon0, timcon1, timcon2, timcon3;
 164         unsigned int ui, cycle_time;
 165         unsigned int lpx;
 166
 167         ui = 1000 / dsi->data_rate + 0x01;
 168         cycle_time = 8000 / dsi->data_rate + 0x01;
 169         lpx = 5;
 170
 171         timcon0 = (8 << 24) | (0xa << 16) | (0x6 << 8) | lpx;
 172         timcon1 = (7 << 24) | (5 * lpx << 16) | ((3 * lpx) / 2) << 8 |
 173                   (4 * lpx);
 174         timcon2 = ((NS_TO_CYCLE(0x64, cycle_time) + 0xa) << 24) |
 175                   (NS_TO_CYCLE(0x150, cycle_time) << 16);
 176         timcon3 = (2 * lpx) << 16 | NS_TO_CYCLE(80 + 52 * ui, cycle_time) << 8 |
 177                    NS_TO_CYCLE(0x40, cycle_time);
 178
 179         writel(timcon0, dsi->regs + DSI_PHY_TIMECON0);
 180         writel(timcon1, dsi->regs + DSI_PHY_TIMECON1);
 181         writel(timcon2, dsi->regs + DSI_PHY_TIMECON2);
 182         writel(timcon3, dsi->regs + DSI_PHY_TIMECON3);
 183 }
 184
 185 static void mtk_dsi_enable(struct mtk_dsi *dsi)
 186 {
 187         mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, DSI_EN);
 188 }
 189
 190 static void mtk_dsi_disable(struct mtk_dsi *dsi)
 191 {
 192         mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_EN, 0);
 193 }
 194
 195 static void mtk_dsi_reset(struct mtk_dsi *dsi)
 196 {
 197         mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, DSI_RESET);
 198         mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
 199 }
 200
 201 static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 202 {
 203         struct device *dev = dsi->dev;
 204         int ret;
 205
 206         if (++dsi->refcount != 1)
 207                 return 0;
 208
 209         /**
 210          * data_rate = (pixel_clock / 1000) * pixel_dipth * mipi_ratio;
 211          * pixel_clock unit is Khz, data_rata unit is MHz, so need divide 1000.
 212          * mipi_ratio is mipi clk coefficient for balance the pixel clk in mipi.
 213          * we set mipi_ratio is 1.05.
 214          */
 215         dsi->data_rate = dsi->vm.pixelclock * 3 * 21 / (1 * 1000 * 10);
 216
 217         ret = clk_set_rate(dsi->hs_clk, dsi->data_rate * 1000000);
 218         if (ret < 0) {
 219                 dev_err(dev, "Failed to set data rate: %d\n", ret);
 220                 goto err_refcount;
 221         }
 222
 223         phy_power_on(dsi->phy);
 224
 225         ret = clk_prepare_enable(dsi->engine_clk);
 226         if (ret < 0) {
 227                 dev_err(dev, "Failed to enable engine clock: %d\n", ret);
 228                 goto err_phy_power_off;
 229         }
 230
 231         ret = clk_prepare_enable(dsi->digital_clk);
 232         if (ret < 0) {
 233                 dev_err(dev, "Failed to enable digital clock: %d\n", ret);
 234                 goto err_disable_engine_clk;
 235         }
 236
 237         mtk_dsi_enable(dsi);
 238         mtk_dsi_reset(dsi);
 239         dsi_phy_timconfig(dsi);
 240
 241         return 0;
 242
 243 err_disable_engine_clk:
 244         clk_disable_unprepare(dsi->engine_clk);
 245 err_phy_power_off:
 246         phy_power_off(dsi->phy);
 247 err_refcount:
 248         dsi->refcount--;
 249         return ret;
 250 }
 251
 252 static void dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
 253 {
 254         mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
 255         mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
 256 }
 257
 258 static void dsi_clk_ulp_mode_leave(struct mtk_dsi *dsi)
 259 {
 260         mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_ULPM_EN, 0);
 261         mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, LC_WAKEUP_EN);
 262         mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_WAKEUP_EN, 0);
 263 }
 264
 265 static void dsi_lane0_ulp_mode_enter(struct mtk_dsi *dsi)
 266 {
 267         mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_HS_TX_EN, 0);
 268         mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
 269 }
 270
 271 static void dsi_lane0_ulp_mode_leave(struct mtk_dsi *dsi)
 272 {
 273         mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_ULPM_EN, 0);
 274         mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, LD0_WAKEUP_EN);
 275         mtk_dsi_mask(dsi, DSI_PHY_LD0CON, LD0_WAKEUP_EN, 0);
 276 }
 277
 278 static bool dsi_clk_hs_state(struct mtk_dsi *dsi)
 279 {
 280         u32 tmp_reg1;
 281
 282         tmp_reg1 = readl(dsi->regs + DSI_PHY_LCCON);
 283         return ((tmp_reg1 & LC_HS_TX_EN) == 1) ? true : false;
 284 }
 285
 286 static void dsi_clk_hs_mode(struct mtk_dsi *dsi, bool enter)
 287 {
 288         if (enter && !dsi_clk_hs_state(dsi))
 289                 mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, LC_HS_TX_EN);
 290         else if (!enter && dsi_clk_hs_state(dsi))
 291                 mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
 292 }
 293
 294 static void dsi_set_mode(struct mtk_dsi *dsi)
 295 {
 296         u32 vid_mode = CMD_MODE;
 297
 298         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 299                 vid_mode = SYNC_PULSE_MODE;
 300
 301                 if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) &&
 302                     !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE))
 303                         vid_mode = BURST_MODE;
 304         }
 305
 306         writel(vid_mode, dsi->regs + DSI_MODE_CTRL);
 307 }
 308
 309 static void dsi_ps_control_vact(struct mtk_dsi *dsi)
 310 {
 311         struct videomode *vm = &dsi->vm;
 312         u32 dsi_buf_bpp, ps_wc;
 313         u32 ps_bpp_mode;
 314
 315         if (dsi->format == MIPI_DSI_FMT_RGB565)
 316                 dsi_buf_bpp = 2;
 317         else
 318                 dsi_buf_bpp = 3;
 319
 320         ps_wc = vm->hactive * dsi_buf_bpp;
 321         ps_bpp_mode = ps_wc;
 322
 323         switch (dsi->format) {
 324         case MIPI_DSI_FMT_RGB888:
 325                 ps_bpp_mode |= PACKED_PS_24BIT_RGB888;
 326                 break;
 327         case MIPI_DSI_FMT_RGB666:
 328                 ps_bpp_mode |= PACKED_PS_18BIT_RGB666;
 329                 break;
 330         case MIPI_DSI_FMT_RGB666_PACKED:
 331                 ps_bpp_mode |= LOOSELY_PS_18BIT_RGB666;
 332                 break;
 333         case MIPI_DSI_FMT_RGB565:
 334                 ps_bpp_mode |= PACKED_PS_16BIT_RGB565;
 335                 break;
 336         }
 337
 338         writel(vm->vactive, dsi->regs + DSI_VACT_NL);
 339         writel(ps_bpp_mode, dsi->regs + DSI_PSCTRL);
 340         writel(ps_wc, dsi->regs + DSI_HSTX_CKL_WC);
 341 }
 342
 343 static void dsi_rxtx_control(struct mtk_dsi *dsi)
 344 {
 345         u32 tmp_reg;
 346
 347         switch (dsi->lanes) {
 348         case 1:
 349                 tmp_reg = 1 << 2;
 350                 break;
 351         case 2:
 352                 tmp_reg = 3 << 2;
 353                 break;
 354         case 3:
 355                 tmp_reg = 7 << 2;
 356                 break;
 357         case 4:
 358                 tmp_reg = 0xf << 2;
 359                 break;
 360         default:
 361                 tmp_reg = 0xf << 2;
 362                 break;
 363         }
 364
 365         writel(tmp_reg, dsi->regs + DSI_TXRX_CTRL);
 366 }
 367
 368 static void dsi_ps_control(struct mtk_dsi *dsi)
 369 {
 370         unsigned int dsi_tmp_buf_bpp;
 371         u32 tmp_reg;
 372
 373         switch (dsi->format) {
 374         case MIPI_DSI_FMT_RGB888:
 375                 tmp_reg = PACKED_PS_24BIT_RGB888;
 376                 dsi_tmp_buf_bpp = 3;
 377                 break;
 378         case MIPI_DSI_FMT_RGB666:
 379                 tmp_reg = LOOSELY_PS_18BIT_RGB666;
 380                 dsi_tmp_buf_bpp = 3;
 381                 break;
 382         case MIPI_DSI_FMT_RGB666_PACKED:
 383                 tmp_reg = PACKED_PS_18BIT_RGB666;
 384                 dsi_tmp_buf_bpp = 3;
 385                 break;
 386         case MIPI_DSI_FMT_RGB565:
 387                 tmp_reg = PACKED_PS_16BIT_RGB565;
 388                 dsi_tmp_buf_bpp = 2;
 389                 break;
 390         default:
 391                 tmp_reg = PACKED_PS_24BIT_RGB888;
 392                 dsi_tmp_buf_bpp = 3;
 393                 break;
 394         }
 395
 396         tmp_reg += dsi->vm.hactive * dsi_tmp_buf_bpp & DSI_PS_WC;
 397         writel(tmp_reg, dsi->regs + DSI_PSCTRL);
 398 }
 399
 400 static void dsi_config_vdo_timing(struct mtk_dsi *dsi)
 401 {
 402         unsigned int horizontal_sync_active_byte;
 403         unsigned int horizontal_backporch_byte;
 404         unsigned int horizontal_frontporch_byte;
 405         unsigned int dsi_tmp_buf_bpp;
 406
 407         struct videomode *vm = &dsi->vm;
 408
 409         if (dsi->format == MIPI_DSI_FMT_RGB565)
 410                 dsi_tmp_buf_bpp = 2;
 411         else
 412                 dsi_tmp_buf_bpp = 3;
 413
 414         writel(vm->vsync_len, dsi->regs + DSI_VSA_NL);
 415         writel(vm->vback_porch, dsi->regs + DSI_VBP_NL);
 416         writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
 417         writel(vm->vactive, dsi->regs + DSI_VACT_NL);
 418
 419         horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
 420
 421         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
 422                 horizontal_backporch_byte =
 423                         (vm->hback_porch * dsi_tmp_buf_bpp - 10);
 424         else
 425                 horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
 426                         dsi_tmp_buf_bpp - 10);
 427
 428         horizontal_frontporch_byte = (vm->hfront_porch * dsi_tmp_buf_bpp - 12);
 429
 430         writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
 431         writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
 432         writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
 433
 434         dsi_ps_control(dsi);
 435 }
 436
 437 static void mtk_dsi_start(struct mtk_dsi *dsi)
 438 {
 439         writel(0, dsi->regs + DSI_START);
 440         writel(1, dsi->regs + DSI_START);
 441 }
 442
 443 static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
 444 {
 445         if (WARN_ON(dsi->refcount == 0))
 446                 return;
 447
 448         if (--dsi->refcount != 0)
 449                 return;
 450
 451         dsi_lane0_ulp_mode_enter(dsi);
 452         dsi_clk_ulp_mode_enter(dsi);
 453
 454         mtk_dsi_disable(dsi);
 455
 456         clk_disable_unprepare(dsi->engine_clk);
 457         clk_disable_unprepare(dsi->digital_clk);
 458
 459         phy_power_off(dsi->phy);
 460 }
 461
 462 static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
 463 {
 464         int ret;
 465
 466         if (dsi->enabled)
 467                 return;
 468
 469         if (dsi->panel) {
 470                 if (drm_panel_prepare(dsi->panel)) {
 471                         DRM_ERROR("failed to setup the panel\n");
 472                         return;
 473                 }
 474         }
 475
 476         ret = mtk_dsi_poweron(dsi);
 477         if (ret < 0) {
 478                 DRM_ERROR("failed to power on dsi\n");
 479                 return;
 480         }
 481
 482         dsi_rxtx_control(dsi);
 483
 484         dsi_clk_ulp_mode_leave(dsi);
 485         dsi_lane0_ulp_mode_leave(dsi);
 486         dsi_clk_hs_mode(dsi, 0);
 487         dsi_set_mode(dsi);
 488
 489         dsi_ps_control_vact(dsi);
 490         dsi_config_vdo_timing(dsi);
 491
 492         dsi_set_mode(dsi);
 493         dsi_clk_hs_mode(dsi, 1);
 494
 495         mtk_dsi_start(dsi);
 496
 497         dsi->enabled = true;
 498 }
 499
 500 static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
 501 {
 502         if (!dsi->enabled)
 503                 return;
 504
 505         if (dsi->panel) {
 506                 if (drm_panel_disable(dsi->panel)) {
 507                         DRM_ERROR("failed to disable the panel\n");
 508                         return;
 509                 }
 510         }
 511
 512         mtk_dsi_poweroff(dsi);
 513
 514         dsi->enabled = false;
 515 }
 516
 517 static void mtk_dsi_encoder_destroy(struct drm_encoder *encoder)
 518 {
 519         drm_encoder_cleanup(encoder);
 520 }
 521
 522 static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = {
 523         .destroy = mtk_dsi_encoder_destroy,
 524 };
 525
 526 static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
 527                                        const struct drm_display_mode *mode,
 528                                        struct drm_display_mode *adjusted_mode)
 529 {
 530         return true;
 531 }
 532
 533 static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
 534                                      struct drm_display_mode *mode,
 535                                      struct drm_display_mode *adjusted)
 536 {
 537         struct mtk_dsi *dsi = encoder_to_dsi(encoder);
 538
 539         dsi->vm.pixelclock = adjusted->clock;
 540         dsi->vm.hactive = adjusted->hdisplay;
 541         dsi->vm.hback_porch = adjusted->htotal - adjusted->hsync_end;
 542         dsi->vm.hfront_porch = adjusted->hsync_start - adjusted->hdisplay;
 543         dsi->vm.hsync_len = adjusted->hsync_end - adjusted->hsync_start;
 544
 545         dsi->vm.vactive = adjusted->vdisplay;
 546         dsi->vm.vback_porch = adjusted->vtotal - adjusted->vsync_end;
 547         dsi->vm.vfront_porch = adjusted->vsync_start - adjusted->vdisplay;
 548         dsi->vm.vsync_len = adjusted->vsync_end - adjusted->vsync_start;
 549 }
 550
 551 static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)
 552 {
 553         struct mtk_dsi *dsi = encoder_to_dsi(encoder);
 554
 555         mtk_output_dsi_disable(dsi);
 556 }
 557
 558 static void mtk_dsi_encoder_enable(struct drm_encoder *encoder)
 559 {
 560         struct mtk_dsi *dsi = encoder_to_dsi(encoder);
 561
 562         mtk_output_dsi_enable(dsi);
 563 }
 564
 565 static enum drm_connector_status mtk_dsi_connector_detect(
 566         struct drm_connector *connector, bool force)
 567 {
 568         return connector_status_connected;
 569 }
 570
 571 static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
 572 {
 573         struct mtk_dsi *dsi = connector_to_dsi(connector);
 574
 575         return drm_panel_get_modes(dsi->panel);
 576 }
 577
 578 static struct drm_encoder *mtk_dsi_connector_best_encoder(
 579                 struct drm_connector *connector)
 580 {
 581         struct mtk_dsi *dsi = connector_to_dsi(connector);
 582
 583         return &dsi->encoder;
 584 }
 585
 586 static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
 587         .mode_fixup = mtk_dsi_encoder_mode_fixup,
 588         .mode_set = mtk_dsi_encoder_mode_set,
 589         .disable = mtk_dsi_encoder_disable,
 590         .enable = mtk_dsi_encoder_enable,
 591 };
 592
 593 static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
 594         .dpms = drm_atomic_helper_connector_dpms,
 595         .detect = mtk_dsi_connector_detect,
 596         .fill_modes = drm_helper_probe_single_connector_modes,
 597         .destroy = drm_connector_cleanup,
 598         .reset = drm_atomic_helper_connector_reset,
 599         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 600         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 601 };
 602
 603 static const struct drm_connector_helper_funcs
 604         mtk_dsi_connector_helper_funcs = {
 605         .get_modes = mtk_dsi_connector_get_modes,
 606         .best_encoder = mtk_dsi_connector_best_encoder,
 607 };
 608
 609 static int mtk_drm_attach_bridge(struct drm_bridge *bridge,
 610                                  struct drm_encoder *encoder)
 611 {
 612         int ret;
 613
 614         if (!bridge)
 615                 return -ENOENT;
 616
 617         encoder->bridge = bridge;
 618         bridge->encoder = encoder;
 619         ret = drm_bridge_attach(encoder->dev, bridge);
 620         if (ret) {
 621                 DRM_ERROR("Failed to attach bridge to drm\n");
 622                 encoder->bridge = NULL;
 623                 bridge->encoder = NULL;
 624         }
 625
 626         return ret;
 627 }
 628
 629 static int mtk_dsi_create_connector(struct drm_device *drm, struct mtk_dsi *dsi)
 630 {
 631         int ret;
 632
 633         ret = drm_connector_init(drm, &dsi->conn, &mtk_dsi_connector_funcs,
 634                                  DRM_MODE_CONNECTOR_DSI);
 635         if (ret) {
 636                 DRM_ERROR("Failed to connector init to drm\n");
 637                 return ret;
 638         }
 639
 640         drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
 641
 642         dsi->conn.dpms = DRM_MODE_DPMS_OFF;
 643         drm_mode_connector_attach_encoder(&dsi->conn, &dsi->encoder);
 644
 645         if (dsi->panel) {
 646                 ret = drm_panel_attach(dsi->panel, &dsi->conn);
 647                 if (ret) {
 648                         DRM_ERROR("Failed to attach panel to drm\n");
 649                         goto err_connector_cleanup;
 650                 }
 651         }
 652
 653         return 0;
 654
 655 err_connector_cleanup:
 656         drm_connector_cleanup(&dsi->conn);
 657         return ret;
 658 }
 659
 660 static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
 661 {
 662         int ret;
 663
 664         ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
 665                                DRM_MODE_ENCODER_DSI, NULL);
 666         if (ret) {
 667                 DRM_ERROR("Failed to encoder init to drm\n");
 668                 return ret;
 669         }
 670         drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
 671
 672         /*
 673          * Currently display data paths are statically assigned to a crtc each.
 674          * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
 675          */
 676         dsi->encoder.possible_crtcs = 1;
 677
 678         /* If there's a bridge, attach to it and let it create the connector */
 679         ret = mtk_drm_attach_bridge(dsi->bridge, &dsi->encoder);
 680         if (ret) {
 681                 /* Otherwise create our own connector and attach to a panel */
 682                 ret = mtk_dsi_create_connector(drm, dsi);
 683                 if (ret)
 684                         goto err_encoder_cleanup;
 685         }
 686
 687         return 0;
 688
 689 err_encoder_cleanup:
 690         drm_encoder_cleanup(&dsi->encoder);
 691         return ret;
 692 }
 693
 694 static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
 695 {
 696         drm_encoder_cleanup(&dsi->encoder);
 697         /* Skip connector cleanup if creation was delegated to the bridge */
 698         if (dsi->conn.dev)
 699                 drm_connector_cleanup(&dsi->conn);
 700 }
 701
 702 static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
 703 {
 704         struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
 705
 706         mtk_dsi_poweron(dsi);
 707 }
 708
 709 static void mtk_dsi_ddp_stop(struct mtk_ddp_comp *comp)
 710 {
 711         struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
 712
 713         mtk_dsi_poweroff(dsi);
 714 }
 715
 716 static const struct mtk_ddp_comp_funcs mtk_dsi_funcs = {
 717         .start = mtk_dsi_ddp_start,
 718         .stop = mtk_dsi_ddp_stop,
 719 };
 720
 721 static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
 722                                struct mipi_dsi_device *device)
 723 {
 724         struct mtk_dsi *dsi = host_to_dsi(host);
 725
 726         dsi->lanes = device->lanes;
 727         dsi->format = device->format;
 728         dsi->mode_flags = device->mode_flags;
 729
 730         if (dsi->conn.dev)
 731                 drm_helper_hpd_irq_event(dsi->conn.dev);
 732
 733         return 0;
 734 }
 735
 736 static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
 737                                struct mipi_dsi_device *device)
 738 {
 739         struct mtk_dsi *dsi = host_to_dsi(host);
 740
 741         if (dsi->conn.dev)
 742                 drm_helper_hpd_irq_event(dsi->conn.dev);
 743
 744         return 0;
 745 }
 746
 747 static const struct mipi_dsi_host_ops mtk_dsi_ops = {
 748         .attach = mtk_dsi_host_attach,
 749         .detach = mtk_dsi_host_detach,
 750 };
 751
 752 static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 753 {
 754         int ret;
 755         struct drm_device *drm = data;
 756         struct mtk_dsi *dsi = dev_get_drvdata(dev);
 757
 758         ret = mtk_ddp_comp_register(drm, &dsi->ddp_comp);
 759         if (ret < 0) {
 760                 dev_err(dev, "Failed to register component %s: %d\n",
 761                         dev->of_node->full_name, ret);
 762                 return ret;
 763         }
 764
 765         ret = mipi_dsi_host_register(&dsi->host);
 766         if (ret < 0) {
 767                 dev_err(dev, "failed to register DSI host: %d\n", ret);
 768                 goto err_ddp_comp_unregister;
 769         }
 770
 771         ret = mtk_dsi_create_conn_enc(drm, dsi);
 772         if (ret) {
 773                 DRM_ERROR("Encoder create failed with %d\n", ret);
 774                 goto err_unregister;
 775         }
 776
 777         return 0;
 778
 779 err_unregister:
 780         mipi_dsi_host_unregister(&dsi->host);
 781 err_ddp_comp_unregister:
 782         mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
 783         return ret;
 784 }
 785
 786 static void mtk_dsi_unbind(struct device *dev, struct device *master,
 787                            void *data)
 788 {
 789         struct drm_device *drm = data;
 790         struct mtk_dsi *dsi = dev_get_drvdata(dev);
 791
 792         mtk_dsi_destroy_conn_enc(dsi);
 793         mipi_dsi_host_unregister(&dsi->host);
 794         mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
 795 }
 796
 797 static const struct component_ops mtk_dsi_component_ops = {
 798         .bind = mtk_dsi_bind,
 799         .unbind = mtk_dsi_unbind,
 800 };
 801
 802 static int mtk_dsi_probe(struct platform_device *pdev)
 803 {
 804         struct mtk_dsi *dsi;
 805         struct device *dev = &pdev->dev;
 806         struct device_node *remote_node, *endpoint;
 807         struct resource *regs;
 808         int comp_id;
 809         int ret;
 810
 811         dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
 812         if (!dsi)
 813                 return -ENOMEM;
 814
 815         dsi->host.ops = &mtk_dsi_ops;
 816         dsi->host.dev = dev;
 817
 818         endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
 819         if (endpoint) {
 820                 remote_node = of_graph_get_remote_port_parent(endpoint);
 821                 if (!remote_node) {
 822                         dev_err(dev, "No panel connected\n");
 823                         return -ENODEV;
 824                 }
 825
 826                 dsi->bridge = of_drm_find_bridge(remote_node);
 827                 dsi->panel = of_drm_find_panel(remote_node);
 828                 of_node_put(remote_node);
 829                 if (!dsi->bridge && !dsi->panel) {
 830                         dev_info(dev, "Waiting for bridge or panel driver\n");
 831                         return -EPROBE_DEFER;
 832                 }
 833         }
 834
 835         dsi->engine_clk = devm_clk_get(dev, "engine");
 836         if (IS_ERR(dsi->engine_clk)) {
 837                 ret = PTR_ERR(dsi->engine_clk);
 838                 dev_err(dev, "Failed to get engine clock: %d\n", ret);
 839                 return ret;
 840         }
 841
 842         dsi->digital_clk = devm_clk_get(dev, "digital");
 843         if (IS_ERR(dsi->digital_clk)) {
 844                 ret = PTR_ERR(dsi->digital_clk);
 845                 dev_err(dev, "Failed to get digital clock: %d\n", ret);
 846                 return ret;
 847         }
 848
 849         dsi->hs_clk = devm_clk_get(dev, "hs");
 850         if (IS_ERR(dsi->hs_clk)) {
 851                 ret = PTR_ERR(dsi->hs_clk);
 852                 dev_err(dev, "Failed to get hs clock: %d\n", ret);
 853                 return ret;
 854         }
 855
 856         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 857         dsi->regs = devm_ioremap_resource(dev, regs);
 858         if (IS_ERR(dsi->regs)) {
 859                 ret = PTR_ERR(dsi->regs);
 860                 dev_err(dev, "Failed to ioremap memory: %d\n", ret);
 861                 return ret;
 862         }
 863
 864         dsi->phy = devm_phy_get(dev, "dphy");
 865         if (IS_ERR(dsi->phy)) {
 866                 ret = PTR_ERR(dsi->phy);
 867                 dev_err(dev, "Failed to get MIPI-DPHY: %d\n", ret);
 868                 return ret;
 869         }
 870
 871         comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
 872         if (comp_id < 0) {
 873                 dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
 874                 return comp_id;
 875         }
 876
 877         ret = mtk_ddp_comp_init(dev, dev->of_node, &dsi->ddp_comp, comp_id,
 878                                 &mtk_dsi_funcs);
 879         if (ret) {
 880                 dev_err(dev, "Failed to initialize component: %d\n", ret);
 881                 return ret;
 882         }
 883
 884         platform_set_drvdata(pdev, dsi);
 885
 886         return component_add(&pdev->dev, &mtk_dsi_component_ops);
 887 }
 888
 889 static int mtk_dsi_remove(struct platform_device *pdev)
 890 {
 891         struct mtk_dsi *dsi = platform_get_drvdata(pdev);
 892
 893         mtk_output_dsi_disable(dsi);
 894         component_del(&pdev->dev, &mtk_dsi_component_ops);
 895
 896         return 0;
 897 }
 898
 899 static const struct of_device_id mtk_dsi_of_match[] = {
 900         { .compatible = "mediatek,mt8173-dsi" },
 901         { },
 902 };
 903
 904 struct platform_driver mtk_dsi_driver = {
 905         .probe = mtk_dsi_probe,
 906         .remove = mtk_dsi_remove,
 907         .driver = {
 908                 .name = "mtk-dsi",
 909                 .of_match_table = mtk_dsi_of_match,
 910         },
 911 };