drivers/gpu/drm/rockchip/rockchip_lvds.c

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