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 <drm/drmP.h>
  20 #include <drm/drm_dp_helper.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_panel.h>
  23 #include <drm/drm_probe_helper.h>
  24
  25 #include <video/of_videomode.h>
  26 #include <video/videomode.h>
  27
  28 #include <drm/bridge/analogix_dp.h>
  29
  30 #include "rockchip_drm_drv.h"
  31 #include "rockchip_drm_psr.h"
  32 #include "rockchip_drm_vop.h"
  33
  34 #define RK3288_GRF_SOC_CON6             0x25c
  35 #define RK3288_EDP_LCDC_SEL             BIT(5)
  36 #define RK3399_GRF_SOC_CON20            0x6250
  37 #define RK3399_EDP_LCDC_SEL             BIT(5)
  38
  39 #define HIWORD_UPDATE(val, mask)        (val | (mask) << 16)
  40
  41 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS   100
  42
  43 #define to_dp(nm)       container_of(nm, struct rockchip_dp_device, nm)
  44
  45 /**
  46  * struct rockchip_dp_chip_data - splite the grf setting of kind of chips
  47  * @lcdsel_grf_reg: grf register offset of lcdc select
  48  * @lcdsel_big: reg value of selecting vop big for eDP
  49  * @lcdsel_lit: reg value of selecting vop little for eDP
  50  * @chip_type: specific chip type
  51  */
  52 struct rockchip_dp_chip_data {
  53         u32     lcdsel_grf_reg;
  54         u32     lcdsel_big;
  55         u32     lcdsel_lit;
  56         u32     chip_type;
  57 };
  58
  59 struct rockchip_dp_device {
  60         struct drm_device        *drm_dev;
  61         struct device            *dev;
  62         struct drm_encoder       encoder;
  63         struct drm_display_mode  mode;
  64
  65         struct clk               *pclk;
  66         struct clk               *grfclk;
  67         struct regmap            *grf;
  68         struct reset_control     *rst;
  69
  70         const struct rockchip_dp_chip_data *data;
  71
  72         struct analogix_dp_device *adp;
  73         struct analogix_dp_plat_data plat_data;
  74 };
  75
  76 static int analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
  77 {
  78         struct rockchip_dp_device *dp = to_dp(encoder);
  79         int ret;
  80
  81         if (!analogix_dp_psr_enabled(dp->adp))
  82                 return 0;
  83
  84         DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
  85
  86         ret = rockchip_drm_wait_vact_end(dp->encoder.crtc,
  87                                          PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
  88         if (ret) {
  89                 DRM_DEV_ERROR(dp->dev, "line flag interrupt did not arrive\n");
  90                 return -ETIMEDOUT;
  91         }
  92
  93         if (enabled)
  94                 return analogix_dp_enable_psr(dp->adp);
  95         else
  96                 return analogix_dp_disable_psr(dp->adp);
  97 }
  98
  99 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
 100 {
 101         reset_control_assert(dp->rst);
 102         usleep_range(10, 20);
 103         reset_control_deassert(dp->rst);
 104
 105         return 0;
 106 }
 107
 108 static int rockchip_dp_poweron_start(struct analogix_dp_plat_data *plat_data)
 109 {
 110         struct rockchip_dp_device *dp = to_dp(plat_data);
 111         int ret;
 112
 113         ret = clk_prepare_enable(dp->pclk);
 114         if (ret < 0) {
 115                 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
 116                 return ret;
 117         }
 118
 119         ret = rockchip_dp_pre_init(dp);
 120         if (ret < 0) {
 121                 DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret);
 122                 clk_disable_unprepare(dp->pclk);
 123                 return ret;
 124         }
 125
 126         return ret;
 127 }
 128
 129 static int rockchip_dp_poweron_end(struct analogix_dp_plat_data *plat_data)
 130 {
 131         struct rockchip_dp_device *dp = to_dp(plat_data);
 132
 133         return rockchip_drm_psr_inhibit_put(&dp->encoder);
 134 }
 135
 136 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 137 {
 138         struct rockchip_dp_device *dp = to_dp(plat_data);
 139         int ret;
 140
 141         ret = rockchip_drm_psr_inhibit_get(&dp->encoder);
 142         if (ret != 0)
 143                 return ret;
 144
 145         clk_disable_unprepare(dp->pclk);
 146
 147         return 0;
 148 }
 149
 150 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 151                                  struct drm_connector *connector)
 152 {
 153         struct drm_display_info *di = &connector->display_info;
 154         /* VOP couldn't output YUV video format for eDP rightly */
 155         u32 mask = DRM_COLOR_FORMAT_YCRCB444 | DRM_COLOR_FORMAT_YCRCB422;
 156
 157         if ((di->color_formats & mask)) {
 158                 DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
 159                 di->color_formats &= ~mask;
 160                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 161                 di->bpc = 8;
 162         }
 163
 164         return 0;
 165 }
 166
 167 static bool
 168 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 169                                    const struct drm_display_mode *mode,
 170                                    struct drm_display_mode *adjusted_mode)
 171 {
 172         /* do nothing */
 173         return true;
 174 }
 175
 176 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 177                                              struct drm_display_mode *mode,
 178                                              struct drm_display_mode *adjusted)
 179 {
 180         /* do nothing */
 181 }
 182
 183 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)
 184 {
 185         struct rockchip_dp_device *dp = to_dp(encoder);
 186         int ret;
 187         u32 val;
 188
 189         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 190         if (ret < 0)
 191                 return;
 192
 193         if (ret)
 194                 val = dp->data->lcdsel_lit;
 195         else
 196                 val = dp->data->lcdsel_big;
 197
 198         DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 199
 200         ret = clk_prepare_enable(dp->grfclk);
 201         if (ret < 0) {
 202                 DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret);
 203                 return;
 204         }
 205
 206         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 207         if (ret != 0)
 208                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
 209
 210         clk_disable_unprepare(dp->grfclk);
 211 }
 212
 213 static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
 214 {
 215         /* do nothing */
 216 }
 217
 218 static int
 219 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 220                                       struct drm_crtc_state *crtc_state,
 221                                       struct drm_connector_state *conn_state)
 222 {
 223         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 224         struct drm_display_info *di = &conn_state->connector->display_info;
 225
 226         /*
 227          * The hardware IC designed that VOP must output the RGB10 video
 228          * format to eDP controller, and if eDP panel only support RGB8,
 229          * then eDP controller should cut down the video data, not via VOP
 230          * controller, that's why we need to hardcode the VOP output mode
 231          * to RGA10 here.
 232          */
 233
 234         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 235         s->output_type = DRM_MODE_CONNECTOR_eDP;
 236         s->output_bpc = di->bpc;
 237
 238         return 0;
 239 }
 240
 241 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 242         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 243         .mode_set = rockchip_dp_drm_encoder_mode_set,
 244         .enable = rockchip_dp_drm_encoder_enable,
 245         .disable = rockchip_dp_drm_encoder_nop,
 246         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 247 };
 248
 249 static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
 250         .destroy = drm_encoder_cleanup,
 251 };
 252
 253 static int rockchip_dp_of_probe(struct rockchip_dp_device *dp)
 254 {
 255         struct device *dev = dp->dev;
 256         struct device_node *np = dev->of_node;
 257
 258         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 259         if (IS_ERR(dp->grf)) {
 260                 DRM_DEV_ERROR(dev, "failed to get rockchip,grf property\n");
 261                 return PTR_ERR(dp->grf);
 262         }
 263
 264         dp->grfclk = devm_clk_get(dev, "grf");
 265         if (PTR_ERR(dp->grfclk) == -ENOENT) {
 266                 dp->grfclk = NULL;
 267         } else if (PTR_ERR(dp->grfclk) == -EPROBE_DEFER) {
 268                 return -EPROBE_DEFER;
 269         } else if (IS_ERR(dp->grfclk)) {
 270                 DRM_DEV_ERROR(dev, "failed to get grf clock\n");
 271                 return PTR_ERR(dp->grfclk);
 272         }
 273
 274         dp->pclk = devm_clk_get(dev, "pclk");
 275         if (IS_ERR(dp->pclk)) {
 276                 DRM_DEV_ERROR(dev, "failed to get pclk property\n");
 277                 return PTR_ERR(dp->pclk);
 278         }
 279
 280         dp->rst = devm_reset_control_get(dev, "dp");
 281         if (IS_ERR(dp->rst)) {
 282                 DRM_DEV_ERROR(dev, "failed to get dp reset control\n");
 283                 return PTR_ERR(dp->rst);
 284         }
 285
 286         return 0;
 287 }
 288
 289 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 290 {
 291         struct drm_encoder *encoder = &dp->encoder;
 292         struct drm_device *drm_dev = dp->drm_dev;
 293         struct device *dev = dp->dev;
 294         int ret;
 295
 296         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 297                                                              dev->of_node);
 298         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 299
 300         ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
 301                                DRM_MODE_ENCODER_TMDS, NULL);
 302         if (ret) {
 303                 DRM_ERROR("failed to initialize encoder with drm\n");
 304                 return ret;
 305         }
 306
 307         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 308
 309         return 0;
 310 }
 311
 312 static int rockchip_dp_bind(struct device *dev, struct device *master,
 313                             void *data)
 314 {
 315         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 316         const struct rockchip_dp_chip_data *dp_data;
 317         struct drm_device *drm_dev = data;
 318         int ret;
 319
 320         dp_data = of_device_get_match_data(dev);
 321         if (!dp_data)
 322                 return -ENODEV;
 323
 324         dp->data = dp_data;
 325         dp->drm_dev = drm_dev;
 326
 327         ret = rockchip_dp_drm_create_encoder(dp);
 328         if (ret) {
 329                 DRM_ERROR("failed to create drm encoder\n");
 330                 return ret;
 331         }
 332
 333         dp->plat_data.encoder = &dp->encoder;
 334
 335         dp->plat_data.dev_type = dp->data->chip_type;
 336         dp->plat_data.power_on_start = rockchip_dp_poweron_start;
 337         dp->plat_data.power_on_end = rockchip_dp_poweron_end;
 338         dp->plat_data.power_off = rockchip_dp_powerdown;
 339         dp->plat_data.get_modes = rockchip_dp_get_modes;
 340
 341         ret = rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
 342         if (ret < 0)
 343                 goto err_cleanup_encoder;
 344
 345         dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 346         if (IS_ERR(dp->adp)) {
 347                 ret = PTR_ERR(dp->adp);
 348                 goto err_unreg_psr;
 349         }
 350
 351         return 0;
 352 err_unreg_psr:
 353         rockchip_drm_psr_unregister(&dp->encoder);
 354 err_cleanup_encoder:
 355         dp->encoder.funcs->destroy(&dp->encoder);
 356         return ret;
 357 }
 358
 359 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 360                                void *data)
 361 {
 362         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 363
 364         analogix_dp_unbind(dp->adp);
 365         rockchip_drm_psr_unregister(&dp->encoder);
 366         dp->encoder.funcs->destroy(&dp->encoder);
 367
 368         dp->adp = ERR_PTR(-ENODEV);
 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         struct drm_panel *panel = NULL;
 380         struct rockchip_dp_device *dp;
 381         int ret;
 382
 383         ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
 384         if (ret < 0)
 385                 return ret;
 386
 387         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 388         if (!dp)
 389                 return -ENOMEM;
 390
 391         dp->dev = dev;
 392         dp->adp = ERR_PTR(-ENODEV);
 393         dp->plat_data.panel = panel;
 394
 395         ret = rockchip_dp_of_probe(dp);
 396         if (ret < 0)
 397                 return ret;
 398
 399         platform_set_drvdata(pdev, dp);
 400
 401         return component_add(dev, &rockchip_dp_component_ops);
 402 }
 403
 404 static int rockchip_dp_remove(struct platform_device *pdev)
 405 {
 406         component_del(&pdev->dev, &rockchip_dp_component_ops);
 407
 408         return 0;
 409 }
 410
 411 #ifdef CONFIG_PM_SLEEP
 412 static int rockchip_dp_suspend(struct device *dev)
 413 {
 414         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 415
 416         if (IS_ERR(dp->adp))
 417                 return 0;
 418
 419         return analogix_dp_suspend(dp->adp);
 420 }
 421
 422 static int rockchip_dp_resume(struct device *dev)
 423 {
 424         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 425
 426         if (IS_ERR(dp->adp))
 427                 return 0;
 428
 429         return analogix_dp_resume(dp->adp);
 430 }
 431 #endif
 432
 433 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 434 #ifdef CONFIG_PM_SLEEP
 435         .suspend_late = rockchip_dp_suspend,
 436         .resume_early = rockchip_dp_resume,
 437 #endif
 438 };
 439
 440 static const struct rockchip_dp_chip_data rk3399_edp = {
 441         .lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
 442         .lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL),
 443         .lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL),
 444         .chip_type = RK3399_EDP,
 445 };
 446
 447 static const struct rockchip_dp_chip_data rk3288_dp = {
 448         .lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
 449         .lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL),
 450         .lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL),
 451         .chip_type = RK3288_DP,
 452 };
 453
 454 static const struct of_device_id rockchip_dp_dt_ids[] = {
 455         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 456         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 457         {}
 458 };
 459 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 460
 461 struct platform_driver rockchip_dp_driver = {
 462         .probe = rockchip_dp_probe,
 463         .remove = rockchip_dp_remove,
 464         .driver = {
 465                    .name = "rockchip-dp",
 466                    .pm = &rockchip_dp_pm_ops,
 467                    .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
 468         },
 469 };