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

   1 /*
   2  * Rockchip SoC DP (Display Port) interface driver.
   3  *
   4  * Copyright (C) Fuzhou Rockchip Electronics Co., Ltd.
   5  * Author: Andy Yan <andy.yan@rock-chips.com>
   6  *         Yakir Yang <ykk@rock-chips.com>
   7  *         Jeff Chen <jeff.chen@rock-chips.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/component.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/of_device.h>
  18 #include <linux/of_graph.h>
  19 #include <linux/regmap.h>
  20 #include <linux/reset.h>
  21 #include <linux/clk.h>
  22
  23 #include <drm/drmP.h>
  24 #include <drm/drm_crtc_helper.h>
  25 #include <drm/drm_dp_helper.h>
  26 #include <drm/drm_of.h>
  27 #include <drm/drm_panel.h>
  28
  29 #include <video/of_videomode.h>
  30 #include <video/videomode.h>
  31
  32 #include <drm/bridge/analogix_dp.h>
  33
  34 #include "rockchip_drm_drv.h"
  35 #include "rockchip_drm_psr.h"
  36 #include "rockchip_drm_vop.h"
  37
  38 #define RK3288_GRF_SOC_CON6             0x25c
  39 #define RK3288_EDP_LCDC_SEL             BIT(5)
  40 #define RK3399_GRF_SOC_CON20            0x6250
  41 #define RK3399_EDP_LCDC_SEL             BIT(5)
  42
  43 #define HIWORD_UPDATE(val, mask)        (val | (mask) << 16)
  44
  45 #define PSR_WAIT_LINE_FLAG_TIMEOUT_MS   100
  46
  47 #define to_dp(nm)       container_of(nm, struct rockchip_dp_device, nm)
  48
  49 /**
  50  * struct rockchip_dp_chip_data - splite the grf setting of kind of chips
  51  * @lcdsel_grf_reg: grf register offset of lcdc select
  52  * @lcdsel_big: reg value of selecting vop big for eDP
  53  * @lcdsel_lit: reg value of selecting vop little for eDP
  54  * @chip_type: specific chip type
  55  */
  56 struct rockchip_dp_chip_data {
  57         u32     lcdsel_grf_reg;
  58         u32     lcdsel_big;
  59         u32     lcdsel_lit;
  60         u32     chip_type;
  61 };
  62
  63 struct rockchip_dp_device {
  64         struct drm_device        *drm_dev;
  65         struct device            *dev;
  66         struct drm_encoder       encoder;
  67         struct drm_display_mode  mode;
  68
  69         struct clk               *pclk;
  70         struct clk               *grfclk;
  71         struct regmap            *grf;
  72         struct reset_control     *rst;
  73
  74         struct work_struct       psr_work;
  75         spinlock_t               psr_lock;
  76         unsigned int             psr_state;
  77
  78         const struct rockchip_dp_chip_data *data;
  79
  80         struct analogix_dp_plat_data plat_data;
  81 };
  82
  83 static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
  84 {
  85         struct rockchip_dp_device *dp = to_dp(encoder);
  86         unsigned long flags;
  87
  88         if (!analogix_dp_psr_supported(dp->dev))
  89                 return;
  90
  91         DRM_DEV_DEBUG(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
  92
  93         spin_lock_irqsave(&dp->psr_lock, flags);
  94         if (enabled)
  95                 dp->psr_state = EDP_VSC_PSR_STATE_ACTIVE;
  96         else
  97                 dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
  98
  99         schedule_work(&dp->psr_work);
 100         spin_unlock_irqrestore(&dp->psr_lock, flags);
 101 }
 102
 103 static void analogix_dp_psr_work(struct work_struct *work)
 104 {
 105         struct rockchip_dp_device *dp =
 106                                 container_of(work, typeof(*dp), psr_work);
 107         int ret;
 108         unsigned long flags;
 109
 110         ret = rockchip_drm_wait_vact_end(dp->encoder.crtc,
 111                                          PSR_WAIT_LINE_FLAG_TIMEOUT_MS);
 112         if (ret) {
 113                 DRM_DEV_ERROR(dp->dev, "line flag interrupt did not arrive\n");
 114                 return;
 115         }
 116
 117         spin_lock_irqsave(&dp->psr_lock, flags);
 118         if (dp->psr_state == EDP_VSC_PSR_STATE_ACTIVE)
 119                 analogix_dp_enable_psr(dp->dev);
 120         else
 121                 analogix_dp_disable_psr(dp->dev);
 122         spin_unlock_irqrestore(&dp->psr_lock, flags);
 123 }
 124
 125 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
 126 {
 127         reset_control_assert(dp->rst);
 128         usleep_range(10, 20);
 129         reset_control_deassert(dp->rst);
 130
 131         return 0;
 132 }
 133
 134 static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
 135 {
 136         struct rockchip_dp_device *dp = to_dp(plat_data);
 137         int ret;
 138
 139         cancel_work_sync(&dp->psr_work);
 140
 141         ret = clk_prepare_enable(dp->pclk);
 142         if (ret < 0) {
 143                 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
 144                 return ret;
 145         }
 146
 147         ret = rockchip_dp_pre_init(dp);
 148         if (ret < 0) {
 149                 DRM_DEV_ERROR(dp->dev, "failed to dp pre init %d\n", ret);
 150                 clk_disable_unprepare(dp->pclk);
 151                 return ret;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
 158 {
 159         struct rockchip_dp_device *dp = to_dp(plat_data);
 160
 161         clk_disable_unprepare(dp->pclk);
 162
 163         return 0;
 164 }
 165
 166 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 167                                  struct drm_connector *connector)
 168 {
 169         struct drm_display_info *di = &connector->display_info;
 170         /* VOP couldn't output YUV video format for eDP rightly */
 171         u32 mask = DRM_COLOR_FORMAT_YCRCB444 | DRM_COLOR_FORMAT_YCRCB422;
 172
 173         if ((di->color_formats & mask)) {
 174                 DRM_DEBUG_KMS("Swapping display color format from YUV to RGB\n");
 175                 di->color_formats &= ~mask;
 176                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 177                 di->bpc = 8;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static bool
 184 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 185                                    const struct drm_display_mode *mode,
 186                                    struct drm_display_mode *adjusted_mode)
 187 {
 188         /* do nothing */
 189         return true;
 190 }
 191
 192 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 193                                              struct drm_display_mode *mode,
 194                                              struct drm_display_mode *adjusted)
 195 {
 196         /* do nothing */
 197 }
 198
 199 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)
 200 {
 201         struct rockchip_dp_device *dp = to_dp(encoder);
 202         int ret;
 203         u32 val;
 204
 205         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 206         if (ret < 0)
 207                 return;
 208
 209         if (ret)
 210                 val = dp->data->lcdsel_lit;
 211         else
 212                 val = dp->data->lcdsel_big;
 213
 214         DRM_DEV_DEBUG(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 215
 216         ret = clk_prepare_enable(dp->grfclk);
 217         if (ret < 0) {
 218                 DRM_DEV_ERROR(dp->dev, "failed to enable grfclk %d\n", ret);
 219                 return;
 220         }
 221
 222         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 223         if (ret != 0)
 224                 DRM_DEV_ERROR(dp->dev, "Could not write to GRF: %d\n", ret);
 225
 226         clk_disable_unprepare(dp->grfclk);
 227 }
 228
 229 static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
 230 {
 231         /* do nothing */
 232 }
 233
 234 static int
 235 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 236                                       struct drm_crtc_state *crtc_state,
 237                                       struct drm_connector_state *conn_state)
 238 {
 239         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 240
 241         /*
 242          * The hardware IC designed that VOP must output the RGB10 video
 243          * format to eDP controller, and if eDP panel only support RGB8,
 244          * then eDP controller should cut down the video data, not via VOP
 245          * controller, that's why we need to hardcode the VOP output mode
 246          * to RGA10 here.
 247          */
 248
 249         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 250         s->output_type = DRM_MODE_CONNECTOR_eDP;
 251
 252         return 0;
 253 }
 254
 255 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 256         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 257         .mode_set = rockchip_dp_drm_encoder_mode_set,
 258         .enable = rockchip_dp_drm_encoder_enable,
 259         .disable = rockchip_dp_drm_encoder_nop,
 260         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 261 };
 262
 263 static void rockchip_dp_drm_encoder_destroy(struct drm_encoder *encoder)
 264 {
 265         drm_encoder_cleanup(encoder);
 266 }
 267
 268 static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
 269         .destroy = rockchip_dp_drm_encoder_destroy,
 270 };
 271
 272 static int rockchip_dp_init(struct rockchip_dp_device *dp)
 273 {
 274         struct device *dev = dp->dev;
 275         struct device_node *np = dev->of_node;
 276         int ret;
 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         ret = clk_prepare_enable(dp->pclk);
 307         if (ret < 0) {
 308                 DRM_DEV_ERROR(dp->dev, "failed to enable pclk %d\n", ret);
 309                 return ret;
 310         }
 311
 312         ret = rockchip_dp_pre_init(dp);
 313         if (ret < 0) {
 314                 DRM_DEV_ERROR(dp->dev, "failed to pre init %d\n", ret);
 315                 clk_disable_unprepare(dp->pclk);
 316                 return ret;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 323 {
 324         struct drm_encoder *encoder = &dp->encoder;
 325         struct drm_device *drm_dev = dp->drm_dev;
 326         struct device *dev = dp->dev;
 327         int ret;
 328
 329         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 330                                                              dev->of_node);
 331         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 332
 333         ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
 334                                DRM_MODE_ENCODER_TMDS, NULL);
 335         if (ret) {
 336                 DRM_ERROR("failed to initialize encoder with drm\n");
 337                 return ret;
 338         }
 339
 340         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 341
 342         return 0;
 343 }
 344
 345 static int rockchip_dp_bind(struct device *dev, struct device *master,
 346                             void *data)
 347 {
 348         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 349         const struct rockchip_dp_chip_data *dp_data;
 350         struct drm_device *drm_dev = data;
 351         int ret;
 352
 353         /*
 354          * Just like the probe function said, we don't need the
 355          * device drvrate anymore, we should leave the charge to
 356          * analogix dp driver, set the device drvdata to NULL.
 357          */
 358         dev_set_drvdata(dev, NULL);
 359
 360         dp_data = of_device_get_match_data(dev);
 361         if (!dp_data)
 362                 return -ENODEV;
 363
 364         ret = rockchip_dp_init(dp);
 365         if (ret < 0)
 366                 return ret;
 367
 368         dp->data = dp_data;
 369         dp->drm_dev = drm_dev;
 370
 371         ret = rockchip_dp_drm_create_encoder(dp);
 372         if (ret) {
 373                 DRM_ERROR("failed to create drm encoder\n");
 374                 return ret;
 375         }
 376
 377         dp->plat_data.encoder = &dp->encoder;
 378
 379         dp->plat_data.dev_type = dp->data->chip_type;
 380         dp->plat_data.power_on = rockchip_dp_poweron;
 381         dp->plat_data.power_off = rockchip_dp_powerdown;
 382         dp->plat_data.get_modes = rockchip_dp_get_modes;
 383
 384         spin_lock_init(&dp->psr_lock);
 385         dp->psr_state = ~EDP_VSC_PSR_STATE_ACTIVE;
 386         INIT_WORK(&dp->psr_work, analogix_dp_psr_work);
 387
 388         rockchip_drm_psr_register(&dp->encoder, analogix_dp_psr_set);
 389
 390         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 391 }
 392
 393 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 394                                void *data)
 395 {
 396         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 397
 398         rockchip_drm_psr_unregister(&dp->encoder);
 399
 400         analogix_dp_unbind(dev, master, data);
 401         clk_disable_unprepare(dp->pclk);
 402 }
 403
 404 static const struct component_ops rockchip_dp_component_ops = {
 405         .bind = rockchip_dp_bind,
 406         .unbind = rockchip_dp_unbind,
 407 };
 408
 409 static int rockchip_dp_probe(struct platform_device *pdev)
 410 {
 411         struct device *dev = &pdev->dev;
 412         struct drm_panel *panel = NULL;
 413         struct rockchip_dp_device *dp;
 414         int ret;
 415
 416         ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
 417         if (ret)
 418                 return ret;
 419
 420         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 421         if (!dp)
 422                 return -ENOMEM;
 423
 424         dp->dev = dev;
 425
 426         dp->plat_data.panel = panel;
 427
 428         /*
 429          * We just use the drvdata until driver run into component
 430          * add function, and then we would set drvdata to null, so
 431          * that analogix dp driver could take charge of the drvdata.
 432          */
 433         platform_set_drvdata(pdev, dp);
 434
 435         return component_add(dev, &rockchip_dp_component_ops);
 436 }
 437
 438 static int rockchip_dp_remove(struct platform_device *pdev)
 439 {
 440         component_del(&pdev->dev, &rockchip_dp_component_ops);
 441
 442         return 0;
 443 }
 444
 445 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 446 #ifdef CONFIG_PM_SLEEP
 447         .suspend = analogix_dp_suspend,
 448         .resume_early = analogix_dp_resume,
 449 #endif
 450 };
 451
 452 static const struct rockchip_dp_chip_data rk3399_edp = {
 453         .lcdsel_grf_reg = RK3399_GRF_SOC_CON20,
 454         .lcdsel_big = HIWORD_UPDATE(0, RK3399_EDP_LCDC_SEL),
 455         .lcdsel_lit = HIWORD_UPDATE(RK3399_EDP_LCDC_SEL, RK3399_EDP_LCDC_SEL),
 456         .chip_type = RK3399_EDP,
 457 };
 458
 459 static const struct rockchip_dp_chip_data rk3288_dp = {
 460         .lcdsel_grf_reg = RK3288_GRF_SOC_CON6,
 461         .lcdsel_big = HIWORD_UPDATE(0, RK3288_EDP_LCDC_SEL),
 462         .lcdsel_lit = HIWORD_UPDATE(RK3288_EDP_LCDC_SEL, RK3288_EDP_LCDC_SEL),
 463         .chip_type = RK3288_DP,
 464 };
 465
 466 static const struct of_device_id rockchip_dp_dt_ids[] = {
 467         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 468         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 469         {}
 470 };
 471 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 472
 473 struct platform_driver rockchip_dp_driver = {
 474         .probe = rockchip_dp_probe,
 475         .remove = rockchip_dp_remove,
 476         .driver = {
 477                    .name = "rockchip-dp",
 478                    .pm = &rockchip_dp_pm_ops,
 479                    .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
 480         },
 481 };