drivers/gpu/drm/rockchip/rockchip_lvds.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:
   4  *      Mark Yao <mark.yao@rock-chips.com>
   5  *      Sandy Huang <hjc@rock-chips.com>
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <drm/drmP.h>
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_crtc_helper.h>
  20 #include <drm/drm_dp_helper.h>
  21 #include <drm/drm_panel.h>
  22 #include <drm/drm_of.h>
  23
  24 #include <linux/component.h>
  25 #include <linux/clk.h>
  26 #include <linux/mfd/syscon.h>
  27 #include <linux/of_graph.h>
  28 #include <linux/pinctrl/devinfo.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/regmap.h>
  31 #include <linux/reset.h>
  32
  33 #include "rockchip_drm_drv.h"
  34 #include "rockchip_drm_vop.h"
  35 #include "rockchip_lvds.h"
  36
  37 #define DISPLAY_OUTPUT_RGB              0
  38 #define DISPLAY_OUTPUT_LVDS             1
  39 #define DISPLAY_OUTPUT_DUAL_LVDS        2
  40
  41 #define connector_to_lvds(c) \
  42                 container_of(c, struct rockchip_lvds, connector)
  43
  44 #define encoder_to_lvds(c) \
  45                 container_of(c, struct rockchip_lvds, encoder)
  46
  47 /**
  48  * rockchip_lvds_soc_data - rockchip lvds Soc private data
  49  * @ch1_offset: lvds channel 1 registe offset
  50  * grf_soc_con6: general registe offset for LVDS contrl
  51  * grf_soc_con7: general registe offset for LVDS contrl
  52  * has_vop_sel: to indicate whether need to choose from different VOP.
  53  */
  54 struct rockchip_lvds_soc_data {
  55         u32 ch1_offset;
  56         int grf_soc_con6;
  57         int grf_soc_con7;
  58         bool has_vop_sel;
  59 };
  60
  61 struct rockchip_lvds {
  62         struct device *dev;
  63         void __iomem *regs;
  64         struct regmap *grf;
  65         struct clk *pclk;
  66         const struct rockchip_lvds_soc_data *soc_data;
  67         int output; /* rgb lvds or dual lvds output */
  68         int format; /* vesa or jeida format */
  69         struct drm_device *drm_dev;
  70         struct drm_panel *panel;
  71         struct drm_bridge *bridge;
  72         struct drm_connector connector;
  73         struct drm_encoder encoder;
  74         struct dev_pin_info *pins;
  75 };
  76
  77 static inline void lvds_writel(struct rockchip_lvds *lvds, u32 offset, u32 val)
  78 {
  79         writel_relaxed(val, lvds->regs + offset);
  80         if (lvds->output == DISPLAY_OUTPUT_LVDS)
  81                 return;
  82         writel_relaxed(val, lvds->regs + offset + lvds->soc_data->ch1_offset);
  83 }
  84
  85 static inline int lvds_name_to_format(const char *s)
  86 {
  87         if (strncmp(s, "jeida-18", 8) == 0)
  88                 return LVDS_JEIDA_18;
  89         else if (strncmp(s, "jeida-24", 8) == 0)
  90                 return LVDS_JEIDA_24;
  91         else if (strncmp(s, "vesa-24", 7) == 0)
  92                 return LVDS_VESA_24;
  93
  94         return -EINVAL;
  95 }
  96
  97 static inline int lvds_name_to_output(const char *s)
  98 {
  99         if (strncmp(s, "rgb", 3) == 0)
 100                 return DISPLAY_OUTPUT_RGB;
 101         else if (strncmp(s, "lvds", 4) == 0)
 102                 return DISPLAY_OUTPUT_LVDS;
 103         else if (strncmp(s, "duallvds", 8) == 0)
 104                 return DISPLAY_OUTPUT_DUAL_LVDS;
 105
 106         return -EINVAL;
 107 }
 108
 109 static int rockchip_lvds_poweron(struct rockchip_lvds *lvds)
 110 {
 111         int ret;
 112         u32 val;
 113
 114         ret = clk_enable(lvds->pclk);
 115         if (ret < 0) {
 116                 DRM_DEV_ERROR(lvds->dev, "failed to enable lvds pclk %d\n", ret);
 117                 return ret;
 118         }
 119         ret = pm_runtime_get_sync(lvds->dev);
 120         if (ret < 0) {
 121                 DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
 122                 clk_disable(lvds->pclk);
 123                 return ret;
 124         }
 125         val = RK3288_LVDS_CH0_REG0_LANE4_EN | RK3288_LVDS_CH0_REG0_LANE3_EN |
 126                 RK3288_LVDS_CH0_REG0_LANE2_EN | RK3288_LVDS_CH0_REG0_LANE1_EN |
 127                 RK3288_LVDS_CH0_REG0_LANE0_EN;
 128         if (lvds->output == DISPLAY_OUTPUT_RGB) {
 129                 val |= RK3288_LVDS_CH0_REG0_TTL_EN |
 130                         RK3288_LVDS_CH0_REG0_LANECK_EN;
 131                 lvds_writel(lvds, RK3288_LVDS_CH0_REG0, val);
 132                 lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
 133                             RK3288_LVDS_PLL_FBDIV_REG2(0x46));
 134                 lvds_writel(lvds, RK3288_LVDS_CH0_REG4,
 135                             RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
 136                             RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
 137                             RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
 138                             RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
 139                             RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
 140                             RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
 141                 lvds_writel(lvds, RK3288_LVDS_CH0_REG5,
 142                             RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
 143                             RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
 144                             RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
 145                             RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
 146                             RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
 147                             RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
 148         } else {
 149                 val |= RK3288_LVDS_CH0_REG0_LVDS_EN |
 150                             RK3288_LVDS_CH0_REG0_LANECK_EN;
 151                 lvds_writel(lvds, RK3288_LVDS_CH0_REG0, val);
 152                 lvds_writel(lvds, RK3288_LVDS_CH0_REG1,
 153                             RK3288_LVDS_CH0_REG1_LANECK_BIAS |
 154                             RK3288_LVDS_CH0_REG1_LANE4_BIAS |
 155                             RK3288_LVDS_CH0_REG1_LANE3_BIAS |
 156                             RK3288_LVDS_CH0_REG1_LANE2_BIAS |
 157                             RK3288_LVDS_CH0_REG1_LANE1_BIAS |
 158                             RK3288_LVDS_CH0_REG1_LANE0_BIAS);
 159                 lvds_writel(lvds, RK3288_LVDS_CH0_REG2,
 160                             RK3288_LVDS_CH0_REG2_RESERVE_ON |
 161                             RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
 162                             RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
 163                             RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
 164                             RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
 165                             RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
 166                             RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
 167                             RK3288_LVDS_PLL_FBDIV_REG2(0x46));
 168                 lvds_writel(lvds, RK3288_LVDS_CH0_REG4, 0x00);
 169                 lvds_writel(lvds, RK3288_LVDS_CH0_REG5, 0x00);
 170         }
 171         lvds_writel(lvds, RK3288_LVDS_CH0_REG3, RK3288_LVDS_PLL_FBDIV_REG3(0x46));
 172         lvds_writel(lvds, RK3288_LVDS_CH0_REGD, RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
 173         lvds_writel(lvds, RK3288_LVDS_CH0_REG20, RK3288_LVDS_CH0_REG20_LSB);
 174
 175         lvds_writel(lvds, RK3288_LVDS_CFG_REGC, RK3288_LVDS_CFG_REGC_PLL_ENABLE);
 176         lvds_writel(lvds, RK3288_LVDS_CFG_REG21, RK3288_LVDS_CFG_REG21_TX_ENABLE);
 177
 178         return 0;
 179 }
 180
 181 static void rockchip_lvds_poweroff(struct rockchip_lvds *lvds)
 182 {
 183         int ret;
 184         u32 val;
 185
 186         lvds_writel(lvds, RK3288_LVDS_CFG_REG21, RK3288_LVDS_CFG_REG21_TX_ENABLE);
 187         lvds_writel(lvds, RK3288_LVDS_CFG_REGC, RK3288_LVDS_CFG_REGC_PLL_ENABLE);
 188         val = LVDS_DUAL | LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN | LVDS_PWRDN;
 189         val |= val << 16;
 190         ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con7, val);
 191         if (ret != 0)
 192                 DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
 193
 194         pm_runtime_put(lvds->dev);
 195         clk_disable(lvds->pclk);
 196 }
 197
 198 static const struct drm_connector_funcs rockchip_lvds_connector_funcs = {
 199         .fill_modes = drm_helper_probe_single_connector_modes,
 200         .destroy = drm_connector_cleanup,
 201         .reset = drm_atomic_helper_connector_reset,
 202         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 203         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 204 };
 205
 206 static int rockchip_lvds_connector_get_modes(struct drm_connector *connector)
 207 {
 208         struct rockchip_lvds *lvds = connector_to_lvds(connector);
 209         struct drm_panel *panel = lvds->panel;
 210
 211         return drm_panel_get_modes(panel);
 212 }
 213
 214 static const
 215 struct drm_connector_helper_funcs rockchip_lvds_connector_helper_funcs = {
 216         .get_modes = rockchip_lvds_connector_get_modes,
 217 };
 218
 219 static void rockchip_lvds_grf_config(struct drm_encoder *encoder,
 220                                      struct drm_display_mode *mode)
 221 {
 222         struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
 223         u8 pin_hsync = (mode->flags & DRM_MODE_FLAG_PHSYNC) ? 1 : 0;
 224         u8 pin_dclk = (mode->flags & DRM_MODE_FLAG_PCSYNC) ? 1 : 0;
 225         u32 val;
 226         int ret;
 227
 228         /* iomux to LCD data/sync mode */
 229         if (lvds->output == DISPLAY_OUTPUT_RGB)
 230                 if (lvds->pins && !IS_ERR(lvds->pins->default_state))
 231                         pinctrl_select_state(lvds->pins->p,
 232                                              lvds->pins->default_state);
 233         val = lvds->format | LVDS_CH0_EN;
 234         if (lvds->output == DISPLAY_OUTPUT_RGB)
 235                 val |= LVDS_TTL_EN | LVDS_CH1_EN;
 236         else if (lvds->output == DISPLAY_OUTPUT_DUAL_LVDS)
 237                 val |= LVDS_DUAL | LVDS_CH1_EN;
 238
 239         if ((mode->htotal - mode->hsync_start) & 0x01)
 240                 val |= LVDS_START_PHASE_RST_1;
 241
 242         val |= (pin_dclk << 8) | (pin_hsync << 9);
 243         val |= (0xffff << 16);
 244         ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con7, val);
 245         if (ret != 0) {
 246                 DRM_DEV_ERROR(lvds->dev, "Could not write to GRF: %d\n", ret);
 247                 return;
 248         }
 249 }
 250
 251 static int rockchip_lvds_set_vop_source(struct rockchip_lvds *lvds,
 252                                         struct drm_encoder *encoder)
 253 {
 254         u32 val;
 255         int ret;
 256
 257         if (!lvds->soc_data->has_vop_sel)
 258                 return 0;
 259
 260         ret = drm_of_encoder_active_endpoint_id(lvds->dev->of_node, encoder);
 261         if (ret < 0)
 262                 return ret;
 263
 264         val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
 265         if (ret)
 266                 val |= RK3288_LVDS_SOC_CON6_SEL_VOP_LIT;
 267
 268         ret = regmap_write(lvds->grf, lvds->soc_data->grf_soc_con6, val);
 269         if (ret < 0)
 270                 return ret;
 271
 272         return 0;
 273 }
 274
 275 static int
 276 rockchip_lvds_encoder_atomic_check(struct drm_encoder *encoder,
 277                                    struct drm_crtc_state *crtc_state,
 278                                    struct drm_connector_state *conn_state)
 279 {
 280         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 281
 282         s->output_mode = ROCKCHIP_OUT_MODE_P888;
 283         s->output_type = DRM_MODE_CONNECTOR_LVDS;
 284
 285         return 0;
 286 }
 287
 288 static void rockchip_lvds_encoder_enable(struct drm_encoder *encoder)
 289 {
 290         struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
 291         struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
 292         int ret;
 293
 294         drm_panel_prepare(lvds->panel);
 295         ret = rockchip_lvds_poweron(lvds);
 296         if (ret < 0) {
 297                 DRM_DEV_ERROR(lvds->dev, "failed to power on lvds: %d\n", ret);
 298                 drm_panel_unprepare(lvds->panel);
 299         }
 300         rockchip_lvds_grf_config(encoder, mode);
 301         rockchip_lvds_set_vop_source(lvds, encoder);
 302         drm_panel_enable(lvds->panel);
 303 }
 304
 305 static void rockchip_lvds_encoder_disable(struct drm_encoder *encoder)
 306 {
 307         struct rockchip_lvds *lvds = encoder_to_lvds(encoder);
 308
 309         drm_panel_disable(lvds->panel);
 310         rockchip_lvds_poweroff(lvds);
 311         drm_panel_unprepare(lvds->panel);
 312 }
 313
 314 static const
 315 struct drm_encoder_helper_funcs rockchip_lvds_encoder_helper_funcs = {
 316         .enable = rockchip_lvds_encoder_enable,
 317         .disable = rockchip_lvds_encoder_disable,
 318         .atomic_check = rockchip_lvds_encoder_atomic_check,
 319 };
 320
 321 static const struct drm_encoder_funcs rockchip_lvds_encoder_funcs = {
 322         .destroy = drm_encoder_cleanup,
 323 };
 324
 325 static const struct rockchip_lvds_soc_data rk3288_lvds_data = {
 326         .ch1_offset = 0x100,
 327         .grf_soc_con6 = 0x025c,
 328         .grf_soc_con7 = 0x0260,
 329         .has_vop_sel = true,
 330 };
 331
 332 static const struct of_device_id rockchip_lvds_dt_ids[] = {
 333         {
 334                 .compatible = "rockchip,rk3288-lvds",
 335                 .data = &rk3288_lvds_data
 336         },
 337         {}
 338 };
 339 MODULE_DEVICE_TABLE(of, rockchip_lvds_dt_ids);
 340
 341 static int rockchip_lvds_bind(struct device *dev, struct device *master,
 342                               void *data)
 343 {
 344         struct rockchip_lvds *lvds = dev_get_drvdata(dev);
 345         struct drm_device *drm_dev = data;
 346         struct drm_encoder *encoder;
 347         struct drm_connector *connector;
 348         struct device_node *remote = NULL;
 349         struct device_node  *port, *endpoint;
 350         int ret = 0, child_count = 0;
 351         const char *name;
 352         u32 endpoint_id;
 353
 354         lvds->drm_dev = drm_dev;
 355         port = of_graph_get_port_by_id(dev->of_node, 1);
 356         if (!port) {
 357                 DRM_DEV_ERROR(dev,
 358                               "can't found port point, please init lvds panel port!\n");
 359                 return -EINVAL;
 360         }
 361         for_each_child_of_node(port, endpoint) {
 362                 child_count++;
 363                 of_property_read_u32(endpoint, "reg", &endpoint_id);
 364                 ret = drm_of_find_panel_or_bridge(dev->of_node, 1, endpoint_id,
 365                                                   &lvds->panel, &lvds->bridge);
 366                 if (!ret) {
 367                         of_node_put(endpoint);
 368                         break;
 369                 }
 370         }
 371         if (!child_count) {
 372                 DRM_DEV_ERROR(dev, "lvds port does not have any children\n");
 373                 ret = -EINVAL;
 374                 goto err_put_port;
 375         } else if (ret) {
 376                 DRM_DEV_ERROR(dev, "failed to find panel and bridge node\n");
 377                 ret = -EPROBE_DEFER;
 378                 goto err_put_port;
 379         }
 380         if (lvds->panel)
 381                 remote = lvds->panel->dev->of_node;
 382         else
 383                 remote = lvds->bridge->of_node;
 384         if (of_property_read_string(dev->of_node, "rockchip,output", &name))
 385                 /* default set it as output rgb */
 386                 lvds->output = DISPLAY_OUTPUT_RGB;
 387         else
 388                 lvds->output = lvds_name_to_output(name);
 389
 390         if (lvds->output < 0) {
 391                 DRM_DEV_ERROR(dev, "invalid output type [%s]\n", name);
 392                 ret = lvds->output;
 393                 goto err_put_remote;
 394         }
 395
 396         if (of_property_read_string(remote, "data-mapping", &name))
 397                 /* default set it as format vesa 18 */
 398                 lvds->format = LVDS_VESA_18;
 399         else
 400                 lvds->format = lvds_name_to_format(name);
 401
 402         if (lvds->format < 0) {
 403                 DRM_DEV_ERROR(dev, "invalid data-mapping format [%s]\n", name);
 404                 ret = lvds->format;
 405                 goto err_put_remote;
 406         }
 407
 408         encoder = &lvds->encoder;
 409         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 410                                                              dev->of_node);
 411
 412         ret = drm_encoder_init(drm_dev, encoder, &rockchip_lvds_encoder_funcs,
 413                                DRM_MODE_ENCODER_LVDS, NULL);
 414         if (ret < 0) {
 415                 DRM_DEV_ERROR(drm_dev->dev,
 416                               "failed to initialize encoder: %d\n", ret);
 417                 goto err_put_remote;
 418         }
 419
 420         drm_encoder_helper_add(encoder, &rockchip_lvds_encoder_helper_funcs);
 421
 422         if (lvds->panel) {
 423                 connector = &lvds->connector;
 424                 connector->dpms = DRM_MODE_DPMS_OFF;
 425                 ret = drm_connector_init(drm_dev, connector,
 426                                          &rockchip_lvds_connector_funcs,
 427                                          DRM_MODE_CONNECTOR_LVDS);
 428                 if (ret < 0) {
 429                         DRM_DEV_ERROR(drm_dev->dev,
 430                                       "failed to initialize connector: %d\n", ret);
 431                         goto err_free_encoder;
 432                 }
 433
 434                 drm_connector_helper_add(connector,
 435                                          &rockchip_lvds_connector_helper_funcs);
 436
 437                 ret = drm_connector_attach_encoder(connector, encoder);
 438                 if (ret < 0) {
 439                         DRM_DEV_ERROR(drm_dev->dev,
 440                                       "failed to attach encoder: %d\n", ret);
 441                         goto err_free_connector;
 442                 }
 443
 444                 ret = drm_panel_attach(lvds->panel, connector);
 445                 if (ret < 0) {
 446                         DRM_DEV_ERROR(drm_dev->dev,
 447                                       "failed to attach panel: %d\n", ret);
 448                         goto err_free_connector;
 449                 }
 450         } else {
 451                 ret = drm_bridge_attach(encoder, lvds->bridge, NULL);
 452                 if (ret) {
 453                         DRM_DEV_ERROR(drm_dev->dev,
 454                                       "failed to attach bridge: %d\n", ret);
 455                         goto err_free_encoder;
 456                 }
 457         }
 458
 459         pm_runtime_enable(dev);
 460         of_node_put(remote);
 461         of_node_put(port);
 462
 463         return 0;
 464
 465 err_free_connector:
 466         drm_connector_cleanup(connector);
 467 err_free_encoder:
 468         drm_encoder_cleanup(encoder);
 469 err_put_remote:
 470         of_node_put(remote);
 471 err_put_port:
 472         of_node_put(port);
 473
 474         return ret;
 475 }
 476
 477 static void rockchip_lvds_unbind(struct device *dev, struct device *master,
 478                                 void *data)
 479 {
 480         struct rockchip_lvds *lvds = dev_get_drvdata(dev);
 481
 482         rockchip_lvds_encoder_disable(&lvds->encoder);
 483         if (lvds->panel)
 484                 drm_panel_detach(lvds->panel);
 485         pm_runtime_disable(dev);
 486         drm_connector_cleanup(&lvds->connector);
 487         drm_encoder_cleanup(&lvds->encoder);
 488 }
 489
 490 static const struct component_ops rockchip_lvds_component_ops = {
 491         .bind = rockchip_lvds_bind,
 492         .unbind = rockchip_lvds_unbind,
 493 };
 494
 495 static int rockchip_lvds_probe(struct platform_device *pdev)
 496 {
 497         struct device *dev = &pdev->dev;
 498         struct rockchip_lvds *lvds;
 499         const struct of_device_id *match;
 500         struct resource *res;
 501         int ret;
 502
 503         if (!dev->of_node)
 504                 return -ENODEV;
 505
 506         lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
 507         if (!lvds)
 508                 return -ENOMEM;
 509
 510         lvds->dev = dev;
 511         match = of_match_node(rockchip_lvds_dt_ids, dev->of_node);
 512         if (!match)
 513                 return -ENODEV;
 514         lvds->soc_data = match->data;
 515
 516         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 517         lvds->regs = devm_ioremap_resource(&pdev->dev, res);
 518         if (IS_ERR(lvds->regs))
 519                 return PTR_ERR(lvds->regs);
 520
 521         lvds->pclk = devm_clk_get(&pdev->dev, "pclk_lvds");
 522         if (IS_ERR(lvds->pclk)) {
 523                 DRM_DEV_ERROR(dev, "could not get pclk_lvds\n");
 524                 return PTR_ERR(lvds->pclk);
 525         }
 526
 527         lvds->pins = devm_kzalloc(lvds->dev, sizeof(*lvds->pins),
 528                                   GFP_KERNEL);
 529         if (!lvds->pins)
 530                 return -ENOMEM;
 531
 532         lvds->pins->p = devm_pinctrl_get(lvds->dev);
 533         if (IS_ERR(lvds->pins->p)) {
 534                 DRM_DEV_ERROR(dev, "no pinctrl handle\n");
 535                 devm_kfree(lvds->dev, lvds->pins);
 536                 lvds->pins = NULL;
 537         } else {
 538                 lvds->pins->default_state =
 539                         pinctrl_lookup_state(lvds->pins->p, "lcdc");
 540                 if (IS_ERR(lvds->pins->default_state)) {
 541                         DRM_DEV_ERROR(dev, "no default pinctrl state\n");
 542                         devm_kfree(lvds->dev, lvds->pins);
 543                         lvds->pins = NULL;
 544                 }
 545         }
 546
 547         lvds->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
 548                                                     "rockchip,grf");
 549         if (IS_ERR(lvds->grf)) {
 550                 DRM_DEV_ERROR(dev, "missing rockchip,grf property\n");
 551                 return PTR_ERR(lvds->grf);
 552         }
 553
 554         dev_set_drvdata(dev, lvds);
 555
 556         ret = clk_prepare(lvds->pclk);
 557         if (ret < 0) {
 558                 DRM_DEV_ERROR(dev, "failed to prepare pclk_lvds\n");
 559                 return ret;
 560         }
 561         ret = component_add(&pdev->dev, &rockchip_lvds_component_ops);
 562         if (ret < 0) {
 563                 DRM_DEV_ERROR(dev, "failed to add component\n");
 564                 clk_unprepare(lvds->pclk);
 565         }
 566
 567         return ret;
 568 }
 569
 570 static int rockchip_lvds_remove(struct platform_device *pdev)
 571 {
 572         struct rockchip_lvds *lvds = dev_get_drvdata(&pdev->dev);
 573
 574         component_del(&pdev->dev, &rockchip_lvds_component_ops);
 575         clk_unprepare(lvds->pclk);
 576
 577         return 0;
 578 }
 579
 580 struct platform_driver rockchip_lvds_driver = {
 581         .probe = rockchip_lvds_probe,
 582         .remove = rockchip_lvds_remove,
 583         .driver = {
 584                    .name = "rockchip-lvds",
 585                    .of_match_table = of_match_ptr(rockchip_lvds_dt_ids),
 586         },
 587 };