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_vop.h"
  36
  37 #define to_dp(nm)       container_of(nm, struct rockchip_dp_device, nm)
  38
  39 /**
  40  * struct rockchip_dp_chip_data - splite the grf setting of kind of chips
  41  * @lcdsel_grf_reg: grf register offset of lcdc select
  42  * @lcdsel_big: reg value of selecting vop big for eDP
  43  * @lcdsel_lit: reg value of selecting vop little for eDP
  44  */
  45 struct rockchip_dp_chip_data {
  46         u32     lcdsel_grf_reg;
  47         u32     lcdsel_big;
  48         u32     lcdsel_lit;
  49         u32     chip_type;
  50 };
  51
  52 struct rockchip_dp_device {
  53         struct drm_device        *drm_dev;
  54         struct device            *dev;
  55         struct drm_encoder       encoder;
  56         struct drm_display_mode  mode;
  57
  58         struct clk               *pclk;
  59         struct regmap            *grf;
  60         struct reset_control     *rst;
  61
  62         const struct rockchip_dp_chip_data *data;
  63
  64         struct analogix_dp_plat_data plat_data;
  65 };
  66
  67 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
  68 {
  69         reset_control_assert(dp->rst);
  70         usleep_range(10, 20);
  71         reset_control_deassert(dp->rst);
  72
  73         return 0;
  74 }
  75
  76 static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
  77 {
  78         struct rockchip_dp_device *dp = to_dp(plat_data);
  79         int ret;
  80
  81         ret = clk_prepare_enable(dp->pclk);
  82         if (ret < 0) {
  83                 dev_err(dp->dev, "failed to enable pclk %d\n", ret);
  84                 return ret;
  85         }
  86
  87         ret = rockchip_dp_pre_init(dp);
  88         if (ret < 0) {
  89                 dev_err(dp->dev, "failed to dp pre init %d\n", ret);
  90                 return ret;
  91         }
  92
  93         return 0;
  94 }
  95
  96 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
  97 {
  98         struct rockchip_dp_device *dp = to_dp(plat_data);
  99
 100         clk_disable_unprepare(dp->pclk);
 101
 102         return 0;
 103 }
 104
 105 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 106                                  struct drm_connector *connector)
 107 {
 108         struct drm_display_info *di = &connector->display_info;
 109
 110         if (di->color_formats & DRM_COLOR_FORMAT_YCRCB444 ||
 111             di->color_formats & DRM_COLOR_FORMAT_YCRCB422) {
 112                 di->color_formats &= ~(DRM_COLOR_FORMAT_YCRCB422 |
 113                                        DRM_COLOR_FORMAT_YCRCB444);
 114                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 115                 di->bpc = 8;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static bool
 122 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 123                                    const struct drm_display_mode *mode,
 124                                    struct drm_display_mode *adjusted_mode)
 125 {
 126         /* do nothing */
 127         return true;
 128 }
 129
 130 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 131                                              struct drm_display_mode *mode,
 132                                              struct drm_display_mode *adjusted)
 133 {
 134         /* do nothing */
 135 }
 136
 137 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)
 138 {
 139         struct rockchip_dp_device *dp = to_dp(encoder);
 140         int ret;
 141         u32 val;
 142
 143         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 144         if (ret < 0)
 145                 return;
 146
 147         if (ret)
 148                 val = dp->data->lcdsel_lit;
 149         else
 150                 val = dp->data->lcdsel_big;
 151
 152         dev_dbg(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 153
 154         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 155         if (ret != 0) {
 156                 dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
 157                 return;
 158         }
 159 }
 160
 161 static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
 162 {
 163         /* do nothing */
 164 }
 165
 166 static int
 167 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 168                                       struct drm_crtc_state *crtc_state,
 169                                       struct drm_connector_state *conn_state)
 170 {
 171         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 172         struct drm_connector *connector = conn_state->connector;
 173         struct drm_display_info *info = &connector->display_info;
 174
 175         /*
 176          * The hardware IC designed that VOP must output the RGB10 video
 177          * format to eDP contoller, and if eDP panel only support RGB8,
 178          * then eDP contoller should cut down the video data, not via VOP
 179          * contoller, that's why we need to hardcode the VOP output mode
 180          * to RGA10 here.
 181          */
 182         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 183         s->output_type = DRM_MODE_CONNECTOR_eDP;
 184         if (info->num_bus_formats)
 185                 s->bus_format = info->bus_formats[0];
 186
 187         return 0;
 188 }
 189
 190 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 191         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 192         .mode_set = rockchip_dp_drm_encoder_mode_set,
 193         .enable = rockchip_dp_drm_encoder_enable,
 194         .disable = rockchip_dp_drm_encoder_nop,
 195         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 196 };
 197
 198 static void rockchip_dp_drm_encoder_destroy(struct drm_encoder *encoder)
 199 {
 200         drm_encoder_cleanup(encoder);
 201 }
 202
 203 static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
 204         .destroy = rockchip_dp_drm_encoder_destroy,
 205 };
 206
 207 static int rockchip_dp_init(struct rockchip_dp_device *dp)
 208 {
 209         struct device *dev = dp->dev;
 210         struct device_node *np = dev->of_node;
 211         int ret;
 212
 213         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 214         if (IS_ERR(dp->grf)) {
 215                 dev_err(dev, "failed to get rockchip,grf property\n");
 216                 return PTR_ERR(dp->grf);
 217         }
 218
 219         dp->pclk = devm_clk_get(dev, "pclk");
 220         if (IS_ERR(dp->pclk)) {
 221                 dev_err(dev, "failed to get pclk property\n");
 222                 return PTR_ERR(dp->pclk);
 223         }
 224
 225         dp->rst = devm_reset_control_get(dev, "dp");
 226         if (IS_ERR(dp->rst)) {
 227                 dev_err(dev, "failed to get dp reset control\n");
 228                 return PTR_ERR(dp->rst);
 229         }
 230
 231         ret = clk_prepare_enable(dp->pclk);
 232         if (ret < 0) {
 233                 dev_err(dp->dev, "failed to enable pclk %d\n", ret);
 234                 return ret;
 235         }
 236
 237         return 0;
 238 }
 239
 240 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 241 {
 242         struct drm_encoder *encoder = &dp->encoder;
 243         struct drm_device *drm_dev = dp->drm_dev;
 244         struct device *dev = dp->dev;
 245         int ret;
 246
 247         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 248                                                              dev->of_node);
 249         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 250
 251         ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
 252                                DRM_MODE_ENCODER_TMDS, NULL);
 253         if (ret) {
 254                 DRM_ERROR("failed to initialize encoder with drm\n");
 255                 return ret;
 256         }
 257
 258         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 259
 260         return 0;
 261 }
 262
 263 static int rockchip_dp_bind(struct device *dev, struct device *master,
 264                             void *data)
 265 {
 266         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 267         const struct rockchip_dp_chip_data *dp_data;
 268         struct device_node *panel_node, *port, *endpoint;
 269         struct drm_panel *panel = NULL;
 270         struct drm_device *drm_dev = data;
 271         int ret;
 272
 273         port = of_graph_get_port_by_id(dev->of_node, 1);
 274         if (port) {
 275                 endpoint = of_get_child_by_name(port, "endpoint");
 276                 of_node_put(port);
 277                 if (!endpoint) {
 278                         dev_err(dev, "no output endpoint found\n");
 279                         return -EINVAL;
 280                 }
 281
 282                 panel_node = of_graph_get_remote_port_parent(endpoint);
 283                 of_node_put(endpoint);
 284                 if (!panel_node) {
 285                         dev_err(dev, "no output node found\n");
 286                         return -EINVAL;
 287                 }
 288
 289                 panel = of_drm_find_panel(panel_node);
 290                 if (!panel) {
 291                         DRM_ERROR("failed to find panel\n");
 292                         of_node_put(panel_node);
 293                         return -EPROBE_DEFER;
 294                 }
 295                 of_node_put(panel_node);
 296         }
 297
 298         dp->plat_data.panel = panel;
 299         /*
 300          * Just like the probe function said, we don't need the
 301          * device drvrate anymore, we should leave the charge to
 302          * analogix dp driver, set the device drvdata to NULL.
 303          */
 304         dev_set_drvdata(dev, NULL);
 305
 306         dp_data = of_device_get_match_data(dev);
 307         if (!dp_data)
 308                 return -ENODEV;
 309
 310         ret = rockchip_dp_init(dp);
 311         if (ret < 0)
 312                 return ret;
 313
 314         dp->data = dp_data;
 315         dp->drm_dev = drm_dev;
 316
 317         ret = rockchip_dp_drm_create_encoder(dp);
 318         if (ret) {
 319                 DRM_ERROR("failed to create drm encoder\n");
 320                 return ret;
 321         }
 322
 323         dp->plat_data.encoder = &dp->encoder;
 324
 325         dp->plat_data.dev_type = ROCKCHIP_DP;
 326         dp->plat_data.subdev_type = dp_data->chip_type;
 327         dp->plat_data.power_on = rockchip_dp_poweron;
 328         dp->plat_data.power_off = rockchip_dp_powerdown;
 329         dp->plat_data.get_modes = rockchip_dp_get_modes;
 330
 331         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 332 }
 333
 334 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 335                                void *data)
 336 {
 337         return analogix_dp_unbind(dev, master, data);
 338 }
 339
 340 static const struct component_ops rockchip_dp_component_ops = {
 341         .bind = rockchip_dp_bind,
 342         .unbind = rockchip_dp_unbind,
 343 };
 344
 345 static int rockchip_dp_probe(struct platform_device *pdev)
 346 {
 347         struct device *dev = &pdev->dev;
 348         struct rockchip_dp_device *dp;
 349
 350         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 351         if (!dp)
 352                 return -ENOMEM;
 353
 354         dp->dev = dev;
 355
 356         /*
 357          * We just use the drvdata until driver run into component
 358          * add function, and then we would set drvdata to null, so
 359          * that analogix dp driver could take charge of the drvdata.
 360          */
 361         platform_set_drvdata(pdev, dp);
 362
 363         return component_add(dev, &rockchip_dp_component_ops);
 364 }
 365
 366 static int rockchip_dp_remove(struct platform_device *pdev)
 367 {
 368         component_del(&pdev->dev, &rockchip_dp_component_ops);
 369
 370         return 0;
 371 }
 372
 373 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 374 #ifdef CONFIG_PM_SLEEP
 375         .suspend = analogix_dp_suspend,
 376         .resume_early = analogix_dp_resume,
 377 #endif
 378 };
 379
 380 static const struct rockchip_dp_chip_data rk3399_edp = {
 381         .lcdsel_grf_reg = 0x6250,
 382         .lcdsel_big = 0 | BIT(21),
 383         .lcdsel_lit = BIT(5) | BIT(21),
 384         .chip_type = RK3399_EDP,
 385 };
 386
 387 static const struct rockchip_dp_chip_data rk3288_dp = {
 388         .lcdsel_grf_reg = 0x025c,
 389         .lcdsel_big = 0 | BIT(21),
 390         .lcdsel_lit = BIT(5) | BIT(21),
 391         .chip_type = RK3288_DP,
 392 };
 393
 394 static const struct of_device_id rockchip_dp_dt_ids[] = {
 395         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 396         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 397         {}
 398 };
 399 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 400
 401 static struct platform_driver rockchip_dp_driver = {
 402         .probe = rockchip_dp_probe,
 403         .remove = rockchip_dp_remove,
 404         .driver = {
 405                    .name = "rockchip-dp",
 406                    .owner = THIS_MODULE,
 407                    .pm = &rockchip_dp_pm_ops,
 408                    .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
 409         },
 410 };
 411
 412 module_platform_driver(rockchip_dp_driver);
 413
 414 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
 415 MODULE_AUTHOR("Jeff chen <jeff.chen@rock-chips.com>");
 416 MODULE_DESCRIPTION("Rockchip Specific Analogix-DP Driver Extension");
 417 MODULE_LICENSE("GPL v2");