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_device.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/regmap.h>
  16 #include <linux/reset.h>
  17 #include <linux/clk.h>
  18
  19 #include <video/of_videomode.h>
  20 #include <video/videomode.h>
  21
  22 #include <drm/drm_atomic.h>
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/bridge/analogix_dp.h>
  25 #include <drm/drm_dp_helper.h>
  26 #include <drm/drm_of.h>
  27 #include <drm/drm_panel.h>
  28 #include <drm/drm_probe_helper.h>
  29
  30 #include "rockchip_drm_drv.h"
  31 #include "rockchip_drm_vop.h"
  32
  33 #define RK3288_GRF_SOC_CON6             0x25c
  34 #define RK3288_EDP_LCDC_SEL             BIT(5)
  35 #define RK3399_GRF_SOC_CON20            0x6250
  36 #define RK3399_EDP_LCDC_SEL             BIT(5)
  37
  38 #define HIWORD_UPDATE(val, mask)        (val | (mask) << 16)
  39
  40 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS   100
  41
  42 #define to_dp(nm)       container_of(nm, struct rockchip_dp_device, nm)
  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 drm_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 int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
  76 {
  77         reset_control_assert(dp->rst);
  78         usleep_range(10, 20);
  79         reset_control_deassert(dp->rst);
  80
  81         return 0;
  82 }
  83
  84 static int rockchip_dp_poweron_start(struct analogix_dp_plat_data *plat_data)
  85 {
  86         struct rockchip_dp_device *dp = to_dp(plat_data);
  87         int ret;
  88
  89         ret = clk_prepare_enable(dp->pclk);
  90         if (ret < 0) {
  91                 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
  92                 return ret;
  93         }
  94
  95         ret = rockchip_dp_pre_init(dp);
  96         if (ret < 0) {
  97                 DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret);
  98                 clk_disable_unprepare(dp->pclk);
  99                 return ret;
 100         }
 101
 102         return ret;
 103 }
 104
 105 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 106 {
 107         struct rockchip_dp_device *dp = to_dp(plat_data);
 108
 109         clk_disable_unprepare(dp->pclk);
 110
 111         return 0;
 112 }
 113
 114 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 115                                  struct drm_connector *connector)
 116 {
 117         struct drm_display_info *di = &connector->display_info;
 118         /* VOP couldn't output YUV video format for eDP rightly */
 119         u32 mask = DRM_COLOR_FORMAT_YCRCB444 | DRM_COLOR_FORMAT_YCRCB422;
 120
 121         if ((di->color_formats & mask)) {
 122                 DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
 123                 di->color_formats &= ~mask;
 124                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 125                 di->bpc = 8;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static bool
 132 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 133                                    const struct drm_display_mode *mode,
 134                                    struct drm_display_mode *adjusted_mode)
 135 {
 136         /* do nothing */
 137         return true;
 138 }
 139
 140 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 141                                              struct drm_display_mode *mode,
 142                                              struct drm_display_mode *adjusted)
 143 {
 144         /* do nothing */
 145 }
 146
 147 static
 148 struct drm_crtc *rockchip_dp_drm_get_new_crtc(struct drm_encoder *encoder,
 149                                               struct drm_atomic_state *state)
 150 {
 151         struct drm_connector *connector;
 152         struct drm_connector_state *conn_state;
 153
 154         connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
 155         if (!connector)
 156                 return NULL;
 157
 158         conn_state = drm_atomic_get_new_connector_state(state, connector);
 159         if (!conn_state)
 160                 return NULL;
 161
 162         return conn_state->crtc;
 163 }
 164
 165 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder,
 166                                            struct drm_atomic_state *state)
 167 {
 168         struct rockchip_dp_device *dp = to_dp(encoder);
 169         struct drm_crtc *crtc;
 170         struct drm_crtc_state *old_crtc_state;
 171         int ret;
 172         u32 val;
 173
 174         crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
 175         if (!crtc)
 176                 return;
 177
 178         old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
 179         /* Coming back from self refresh, nothing to do */
 180         if (old_crtc_state && old_crtc_state->self_refresh_active)
 181                 return;
 182
 183         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 184         if (ret < 0)
 185                 return;
 186
 187         if (ret)
 188                 val = dp->data->lcdsel_lit;
 189         else
 190                 val = dp->data->lcdsel_big;
 191
 192         DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 193
 194         ret = clk_prepare_enable(dp->grfclk);
 195         if (ret < 0) {
 196                 DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret);
 197                 return;
 198         }
 199
 200         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 201         if (ret != 0)
 202                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
 203
 204         clk_disable_unprepare(dp->grfclk);
 205 }
 206
 207 static void rockchip_dp_drm_encoder_disable(struct drm_encoder *encoder,
 208                                             struct drm_atomic_state *state)
 209 {
 210         struct rockchip_dp_device *dp = to_dp(encoder);
 211         struct drm_crtc *crtc;
 212         struct drm_crtc_state *new_crtc_state = NULL;
 213         int ret;
 214
 215         crtc = rockchip_dp_drm_get_new_crtc(encoder, state);
 216         /* No crtc means we're doing a full shutdown */
 217         if (!crtc)
 218                 return;
 219
 220         new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 221         /* If we're not entering self-refresh, no need to wait for vact */
 222         if (!new_crtc_state || !new_crtc_state->self_refresh_active)
 223                 return;
 224
 225         ret = rockchip_drm_wait_vact_end(crtc, PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
 226         if (ret)
 227                 DRM_DEV_ERROR(dp->dev, "line flag irq timed out\n");
 228 }
 229
 230 static int
 231 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 232                                       struct drm_crtc_state *crtc_state,
 233                                       struct drm_connector_state *conn_state)
 234 {
 235         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 236         struct drm_display_info *di = &conn_state->connector->display_info;
 237
 238         /*
 239          * The hardware IC designed that VOP must output the RGB10 video
 240          * format to eDP controller, and if eDP panel only support RGB8,
 241          * then eDP controller should cut down the video data, not via VOP
 242          * controller, that's why we need to hardcode the VOP output mode
 243          * to RGA10 here.
 244          */
 245
 246         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 247         s->output_type = DRM_MODE_CONNECTOR_eDP;
 248         s->output_bpc = di->bpc;
 249
 250         return 0;
 251 }
 252
 253 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 254         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 255         .mode_set = rockchip_dp_drm_encoder_mode_set,
 256         .atomic_enable = rockchip_dp_drm_encoder_enable,
 257         .atomic_disable = rockchip_dp_drm_encoder_disable,
 258         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 259 };
 260
 261 static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
 262         .destroy = drm_encoder_cleanup,
 263 };
 264
 265 static int rockchip_dp_of_probe(struct rockchip_dp_device *dp)
 266 {
 267         struct device *dev = dp->dev;
 268         struct device_node *np = dev->of_node;
 269
 270         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 271         if (IS_ERR(dp->grf)) {
 272                 DRM_DEV_ERROR(dev, "failed to get rockchip,grf property\n");
 273                 return PTR_ERR(dp->grf);
 274         }
 275
 276         dp->grfclk = devm_clk_get(dev, "grf");
 277         if (PTR_ERR(dp->grfclk) == -ENOENT) {
 278                 dp->grfclk = NULL;
 279         } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
 280                 return -EPROBE_DEFER;
 281         } else if (IS_ERR(dp->grfclk)) {
 282                 DRM_DEV_ERROR(dev, "failed to get grf clock\n");
 283                 return PTR_ERR(dp->grfclk);
 284         }
 285
 286         dp->pclk = devm_clk_get(dev, "pclk");
 287         if (IS_ERR(dp->pclk)) {
 288                 DRM_DEV_ERROR(dev, "failed to get pclk property\n");
 289                 return PTR_ERR(dp->pclk);
 290         }
 291
 292         dp->rst = devm_reset_control_get(dev, "dp");
 293         if (IS_ERR(dp->rst)) {
 294                 DRM_DEV_ERROR(dev, "failed to get dp reset control\n");
 295                 return PTR_ERR(dp->rst);
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 302 {
 303         struct drm_encoder *encoder = &dp->encoder;
 304         struct drm_device *drm_dev = dp->drm_dev;
 305         struct device *dev = dp->dev;
 306         int ret;
 307
 308         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 309                                                              dev->of_node);
 310         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 311
 312         ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
 313                                DRM_MODE_ENCODER_TMDS, NULL);
 314         if (ret) {
 315                 DRM_ERROR("failed to initialize encoder with drm\n");
 316                 return ret;
 317         }
 318
 319         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 320
 321         return 0;
 322 }
 323
 324 static int rockchip_dp_bind(struct device *dev, struct device *master,
 325                             void *data)
 326 {
 327         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 328         const struct rockchip_dp_chip_data *dp_data;
 329         struct drm_device *drm_dev = data;
 330         int ret;
 331
 332         dp_data = of_device_get_match_data(dev);
 333         if (!dp_data)
 334                 return -ENODEV;
 335
 336         dp->data = dp_data;
 337         dp->drm_dev = drm_dev;
 338
 339         ret = rockchip_dp_drm_create_encoder(dp);
 340         if (ret) {
 341                 DRM_ERROR("failed to create drm encoder\n");
 342                 return ret;
 343         }
 344
 345         dp->plat_data.encoder = &dp->encoder;
 346
 347         dp->plat_data.dev_type = dp->data->chip_type;
 348         dp->plat_data.power_on_start = rockchip_dp_poweron_start;
 349         dp->plat_data.power_off = rockchip_dp_powerdown;
 350         dp->plat_data.get_modes = rockchip_dp_get_modes;
 351
 352         dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 353         if (IS_ERR(dp->adp)) {
 354                 ret = PTR_ERR(dp->adp);
 355                 goto err_cleanup_encoder;
 356         }
 357
 358         return 0;
 359 err_cleanup_encoder:
 360         dp->encoder.funcs->destroy(&dp->encoder);
 361         return ret;
 362 }
 363
 364 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 365                                void *data)
 366 {
 367         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 368
 369         analogix_dp_unbind(dp->adp);
 370         dp->encoder.funcs->destroy(&dp->encoder);
 371
 372         dp->adp = ERR_PTR(-ENODEV);
 373 }
 374
 375 static const struct component_ops rockchip_dp_component_ops = {
 376         .bind = rockchip_dp_bind,
 377         .unbind = rockchip_dp_unbind,
 378 };
 379
 380 static int rockchip_dp_probe(struct platform_device *pdev)
 381 {
 382         struct device *dev = &pdev->dev;
 383         struct drm_panel *panel = NULL;
 384         struct rockchip_dp_device *dp;
 385         int ret;
 386
 387         ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
 388         if (ret < 0)
 389                 return ret;
 390
 391         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 392         if (!dp)
 393                 return -ENOMEM;
 394
 395         dp->dev = dev;
 396         dp->adp = ERR_PTR(-ENODEV);
 397         dp->plat_data.panel = panel;
 398
 399         ret = rockchip_dp_of_probe(dp);
 400         if (ret < 0)
 401                 return ret;
 402
 403         platform_set_drvdata(pdev, dp);
 404
 405         return component_add(dev, &rockchip_dp_component_ops);
 406 }
 407
 408 static int rockchip_dp_remove(struct platform_device *pdev)
 409 {
 410         component_del(&pdev->dev, &rockchip_dp_component_ops);
 411
 412         return 0;
 413 }
 414
 415 #ifdef CONFIG_PM_SLEEP
 416 static int rockchip_dp_suspend(struct device *dev)
 417 {
 418         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 419
 420         if (IS_ERR(dp->adp))
 421                 return 0;
 422
 423         return analogix_dp_suspend(dp->adp);
 424 }
 425
 426 static int rockchip_dp_resume(struct device *dev)
 427 {
 428         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 429
 430         if (IS_ERR(dp->adp))
 431                 return 0;
 432
 433         return analogix_dp_resume(dp->adp);
 434 }
 435 #endif
 436
 437 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 438 #ifdef CONFIG_PM_SLEEP
 439         .suspend_late = rockchip_dp_suspend,
 440         .resume_early = rockchip_dp_resume,
 441 #endif
 442 };
 443
 444 static const struct rockchip_dp_chip_data rk3399_edp = {
 445         .lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
 446         .lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL),
 447         .lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL),
 448         .chip_type = RK3399_EDP,
 449 };
 450
 451 static const struct rockchip_dp_chip_data rk3288_dp = {
 452         .lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
 453         .lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL),
 454         .lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL),
 455         .chip_type = RK3288_DP,
 456 };
 457
 458 static const struct of_device_id rockchip_dp_dt_ids[] = {
 459         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 460         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 461         {}
 462 };
 463 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 464
 465 struct platform_driver rockchip_dp_driver = {
 466         .probe = rockchip_dp_probe,
 467         .remove = rockchip_dp_remove,
 468         .driver = {
 469                    .name = "rockchip-dp",
 470                    .pm = &rockchip_dp_pm_ops,
 471                    .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
 472         },
 473 };