drivers/gpu/drm/rockchip/analogix_dp-rockchip.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Rockchip SoC DP (Display Port) interface driver.
   4  *
   5  * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd.
   6  * Author: Andy Yan <andy.yan@rock-chips.com>
   7  *         Yakir Yang <ykk@rock-chips.com>
   8  *         Jeff Chen <jeff.chen@rock-chips.com>
   9  */
  10
  11 #include <linux/component.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/of.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/regmap.h>
  18 #include <linux/reset.h>
  19 #include <linux/clk.h>
  20
  21 #include <video/of_videomode.h>
  22 #include <video/videomode.h>
  23
  24 #include <drm/display/drm_dp_helper.h>
  25 #include <drm/drm_atomic.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/bridge/analogix_dp.h>
  28 #include <drm/drm_of.h>
  29 #include <drm/drm_panel.h>
  30 #include <drm/drm_probe_helper.h>
  31 #include <drm/drm_simple_kms_helper.h>
  32
  33 #include "rockchip_drm_drv.h"
  34
  35 #define RK3288_GRF_SOC_CON6             0x25c
  36 #define RK3288_EDP_LCDC_SEL             BIT(5)
  37 #define RK3399_GRF_SOC_CON20            0x6250
  38 #define RK3399_EDP_LCDC_SEL             BIT(5)
  39
  40 #define HIWORD_UPDATE(val, mask)        (val | (mask) << 16)
  41
  42 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS   100
  43
  44 /**
  45  * struct rockchip_dp_chip_data - splite the grf setting of kind of chips
  46  * @lcdsel_grf_reg: grf register offset of lcdc select
  47  * @lcdsel_big: reg value of selecting vop big for eDP
  48  * @lcdsel_lit: reg value of selecting vop little for eDP
  49  * @chip_type: specific chip type
  50  */
  51 struct rockchip_dp_chip_data {
  52         u32     lcdsel_grf_reg;
  53         u32     lcdsel_big;
  54         u32     lcdsel_lit;
  55         u32     chip_type;
  56 };
  57
  58 struct rockchip_dp_device {
  59         struct drm_device        *drm_dev;
  60         struct device            *dev;
  61         struct rockchip_encoder  encoder;
  62         struct drm_display_mode  mode;
  63
  64         struct clk               *pclk;
  65         struct clk               *grfclk;
  66         struct regmap            *grf;
  67         struct reset_control     *rst;
  68
  69         const struct rockchip_dp_chip_data *data;
  70
  71         struct analogix_dp_device *adp;
  72         struct analogix_dp_plat_data plat_data;
  73 };
  74
  75 static struct rockchip_dp_device *encoder_to_dp(struct drm_encoder *encoder)
  76 {
  77         struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);
  78
  79         return container_of(rkencoder, struct rockchip_dp_device, encoder);
  80 }
  81
  82 static struct rockchip_dp_device *pdata_encoder_to_dp(struct analogix_dp_plat_data *plat_data)
  83 {
  84         return container_of(plat_data, struct rockchip_dp_device, plat_data);
  85 }
  86
  87 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
  88 {
  89         reset_control_assert(dp->rst);
  90         usleep_range(10, 20);
  91         reset_control_deassert(dp->rst);
  92
  93         return 0;
  94 }
  95
  96 static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
  97 {
  98         struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
  99         int ret;
 100
 101         ret = clk_prepare_enable(dp->pclk);
 102         if (ret < 0) {
 103                 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
 104                 return ret;
 105         }
 106
 107         ret = rockchip_dp_pre_init(dp);
 108         if (ret < 0) {
 109                 DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret);
 110                 clk_disable_unprepare(dp->pclk);
 111                 return ret;
 112         }
 113
 114         return ret;
 115 }
 116
 117 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 118 {
 119         struct rockchip_dp_device *dp = pdata_encoder_to_dp(plat_data);
 120
 121         clk_disable_unprepare(dp->pclk);
 122
 123         return 0;
 124 }
 125
 126 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 127                                  struct drm_connector *connector)
 128 {
 129         struct drm_display_info *di = &connector->display_info;
 130         /* VOP couldn't output YUV video format for eDP rightly */
 131         u32 mask = DRM_COLOR_FORMAT_YCBCR444 | DRM_COLOR_FORMAT_YCBCR422;
 132
 133         if ((di->color_formats & mask)) {
 134                 DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
 135                 di->color_formats &= ~mask;
 136                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 137                 di->bpc = 8;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static bool
 144 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 145                                    const struct drm_display_mode *mode,
 146                                    struct drm_display_mode *adjusted_mode)
 147 {
 148         /* do nothing */
 149         return true;
 150 }
 151
 152 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 153                                              struct drm_display_mode *mode,
 154                                              struct drm_display_mode *adjusted)
 155 {
 156         /* do nothing */
 157 }
 158
 159 static
 160 struct drm_crtc *rockchip_dp_drm_get_new_crtc(struct drm_encoder *encoder,
 161                                               struct drm_atomic_state *state)
 162 {
 163         struct drm_connector *connector;
 164         struct drm_connector_state *conn_state;
 165
 166         connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
 167         if (!connector)
 168                 return NULL;
 169
 170         conn_state = drm_atomic_get_new_connector_state(state, connector);
 171         if (!conn_state)
 172                 return NULL;
 173
 174         return conn_state->crtc;
 175 }
 176
 177 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder,
 178                                            struct drm_atomic_state *state)
 179 {
 180         struct rockchip_dp_device *dp = encoder_to_dp(encoder);
 181         struct drm_crtc *crtc;
 182         struct drm_crtc_state *old_crtc_state;
 183         int ret;
 184         u32 val;
 185
 186         crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
 187         if (!crtc)
 188                 return;
 189
 190         old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
 191         /* Coming back from self refresh, nothing to do */
 192         if (old_crtc_state && old_crtc_state->self_refresh_active)
 193                 return;
 194
 195         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 196         if (ret < 0)
 197                 return;
 198
 199         if (ret)
 200                 val = dp->data->lcdsel_lit;
 201         else
 202                 val = dp->data->lcdsel_big;
 203
 204         DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 205
 206         ret = clk_prepare_enable(dp->grfclk);
 207         if (ret < 0) {
 208                 DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret);
 209                 return;
 210         }
 211
 212         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 213         if (ret != 0)
 214                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
 215
 216         clk_disable_unprepare(dp->grfclk);
 217 }
 218
 219 static void rockchip_dp_drm_encoder_disable(struct drm_encoder *encoder,
 220                                             struct drm_atomic_state *state)
 221 {
 222         struct rockchip_dp_device *dp = encoder_to_dp(encoder);
 223         struct drm_crtc *crtc;
 224         struct drm_crtc_state *new_crtc_state = NULL;
 225         int ret;
 226
 227         crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
 228         /* No crtc means we're doing a full shutdown */
 229         if (!crtc)
 230                 return;
 231
 232         new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 233         /* If we're not entering self-refresh, no need to wait for vact */
 234         if (!new_crtc_state || !new_crtc_state->self_refresh_active)
 235                 return;
 236
 237         ret = rockchip_drm_wait_vact_end(crtc, PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
 238         if (ret)
 239                 DRM_DEV_ERROR(dp->dev, "line flag irq timed out\n");
 240 }
 241
 242 static int
 243 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 244                                       struct drm_crtc_state *crtc_state,
 245                                       struct drm_connector_state *conn_state)
 246 {
 247         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 248         struct drm_display_info *di = &conn_state->connector->display_info;
 249
 250         /*
 251          * The hardware IC designed that VOP must output the RGB10 video
 252          * format to eDP controller, and if eDP panel only support RGB8,
 253          * then eDP controller should cut down the video data, not via VOP
 254          * controller, that's why we need to hardcode the VOP output mode
 255          * to RGA10 here.
 256          */
 257
 258         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 259         s->output_type = DRM_MODE_CONNECTOR_eDP;
 260         s->output_bpc = di->bpc;
 261
 262         return 0;
 263 }
 264
 265 static const struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 266         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 267         .mode_set = rockchip_dp_drm_encoder_mode_set,
 268         .atomic_enable = rockchip_dp_drm_encoder_enable,
 269         .atomic_disable = rockchip_dp_drm_encoder_disable,
 270         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 271 };
 272
 273 static int rockchip_dp_of_probe(struct rockchip_dp_device *dp)
 274 {
 275         struct device *dev = dp->dev;
 276         struct device_node *np = dev->of_node;
 277
 278         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 279         if (IS_ERR(dp->grf)) {
 280                 DRM_DEV_ERROR(dev, "failed to get rockchip,grf property\n");
 281                 return PTR_ERR(dp->grf);
 282         }
 283
 284         dp->grfclk = devm_clk_get(dev, "grf");
 285         if (PTR_ERR(dp->grfclk) == -ENOENT) {
 286                 dp->grfclk = NULL;
 287         } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
 288                 return -EPROBE_DEFER;
 289         } else if (IS_ERR(dp->grfclk)) {
 290                 DRM_DEV_ERROR(dev, "failed to get grf clock\n");
 291                 return PTR_ERR(dp->grfclk);
 292         }
 293
 294         dp->pclk = devm_clk_get(dev, "pclk");
 295         if (IS_ERR(dp->pclk)) {
 296                 DRM_DEV_ERROR(dev, "failed to get pclk property\n");
 297                 return PTR_ERR(dp->pclk);
 298         }
 299
 300         dp->rst = devm_reset_control_get(dev, "dp");
 301         if (IS_ERR(dp->rst)) {
 302                 DRM_DEV_ERROR(dev, "failed to get dp reset control\n");
 303                 return PTR_ERR(dp->rst);
 304         }
 305
 306         return 0;
 307 }
 308
 309 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 310 {
 311         struct drm_encoder *encoder = &dp->encoder.encoder;
 312         struct drm_device *drm_dev = dp->drm_dev;
 313         struct device *dev = dp->dev;
 314         int ret;
 315
 316         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 317                                                              dev->of_node);
 318         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 319
 320         ret = drm_simple_encoder_init(drm_dev, encoder,
 321                                       DRM_MODE_ENCODER_TMDS);
 322         if (ret) {
 323                 DRM_ERROR("failed to initialize encoder with drm\n");
 324                 return ret;
 325         }
 326
 327         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 328
 329         return 0;
 330 }
 331
 332 static int rockchip_dp_bind(struct device *dev, struct device *master,
 333                             void *data)
 334 {
 335         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 336         struct drm_device *drm_dev = data;
 337         int ret;
 338
 339         dp->drm_dev = drm_dev;
 340
 341         ret = rockchip_dp_drm_create_encoder(dp);
 342         if (ret) {
 343                 DRM_ERROR("failed to create drm encoder\n");
 344                 return ret;
 345         }
 346
 347         rockchip_drm_encoder_set_crtc_endpoint_id(&dp->encoder,
 348                                                   dev->of_node, 0, 0);
 349
 350         dp->plat_data.encoder = &dp->encoder.encoder;
 351
 352         ret = analogix_dp_bind(dp->adp, drm_dev);
 353         if (ret)
 354                 goto err_cleanup_encoder;
 355
 356         return 0;
 357 err_cleanup_encoder:
 358         dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder);
 359         return ret;
 360 }
 361
 362 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 363                                void *data)
 364 {
 365         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 366
 367         analogix_dp_unbind(dp->adp);
 368         dp->encoder.encoder.funcs->destroy(&dp->encoder.encoder);
 369 }
 370
 371 static const struct component_ops rockchip_dp_component_ops = {
 372         .bind = rockchip_dp_bind,
 373         .unbind = rockchip_dp_unbind,
 374 };
 375
 376 static int rockchip_dp_probe(struct platform_device *pdev)
 377 {
 378         struct device *dev = &pdev->dev;
 379         const struct rockchip_dp_chip_data *dp_data;
 380         struct drm_panel *panel = NULL;
 381         struct rockchip_dp_device *dp;
 382         int ret;
 383
 384         dp_data = of_device_get_match_data(dev);
 385         if (!dp_data)
 386                 return -ENODEV;
 387
 388         ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
 389         if (ret < 0)
 390                 return ret;
 391
 392         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 393         if (!dp)
 394                 return -ENOMEM;
 395
 396         dp->dev = dev;
 397         dp->adp = ERR_PTR(-ENODEV);
 398         dp->data = dp_data;
 399         dp->plat_data.panel = panel;
 400         dp->plat_data.dev_type = dp->data->chip_type;
 401         dp->plat_data.power_on = rockchip_dp_poweron;
 402         dp->plat_data.power_off = rockchip_dp_powerdown;
 403         dp->plat_data.get_modes = rockchip_dp_get_modes;
 404
 405         ret = rockchip_dp_of_probe(dp);
 406         if (ret < 0)
 407                 return ret;
 408
 409         platform_set_drvdata(pdev, dp);
 410
 411         dp->adp = analogix_dp_probe(dev, &dp->plat_data);
 412         if (IS_ERR(dp->adp))
 413                 return PTR_ERR(dp->adp);
 414
 415         ret = component_add(dev, &rockchip_dp_component_ops);
 416         if (ret)
 417                 return ret;
 418
 419         return 0;
 420 }
 421
 422 static void rockchip_dp_remove(struct platform_device *pdev)
 423 {
 424         component_del(&pdev->dev, &rockchip_dp_component_ops);
 425 }
 426
 427 static int rockchip_dp_suspend(struct device *dev)
 428 {
 429         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 430
 431         if (IS_ERR(dp->adp))
 432                 return 0;
 433
 434         return analogix_dp_suspend(dp->adp);
 435 }
 436
 437 static int rockchip_dp_resume(struct device *dev)
 438 {
 439         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 440
 441         if (IS_ERR(dp->adp))
 442                 return 0;
 443
 444         return analogix_dp_resume(dp->adp);
 445 }
 446
 447 static DEFINE_RUNTIME_DEV_PM_OPS(rockchip_dp_pm_ops, rockchip_dp_suspend,
 448                 rockchip_dp_resume, NULL);
 449
 450 static const struct rockchip_dp_chip_data rk3399_edp = {
 451         .lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
 452         .lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL),
 453         .lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL),
 454         .chip_type = RK3399_EDP,
 455 };
 456
 457 static const struct rockchip_dp_chip_data rk3288_dp = {
 458         .lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
 459         .lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL),
 460         .lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL),
 461         .chip_type = RK3288_DP,
 462 };
 463
 464 static const struct of_device_id rockchip_dp_dt_ids[] = {
 465         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 466         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 467         {}
 468 };
 469 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 470
 471 struct platform_driver rockchip_dp_driver = {
 472         .probe = rockchip_dp_probe,
 473         .remove_new = rockchip_dp_remove,
 474         .driver = {
 475                    .name = "rockchip-dp",
 476                    .pm = pm_ptr(&rockchip_dp_pm_ops),
 477                    .of_match_table = rockchip_dp_dt_ids,
 478         },
 479 };