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         bool    has_vop_sel;
  51 };
  52
  53 struct rockchip_dp_device {
  54         struct drm_device        *drm_dev;
  55         struct device            *dev;
  56         struct drm_encoder       encoder;
  57         struct drm_display_mode  mode;
  58
  59         struct clk               *pclk;
  60         struct regmap            *grf;
  61         struct reset_control     *rst;
  62
  63         const struct rockchip_dp_chip_data *data;
  64
  65         struct analogix_dp_plat_data plat_data;
  66 };
  67
  68 static int rockchip_dp_pre_init(struct rockchip_dp_device *dp)
  69 {
  70         reset_control_assert(dp->rst);
  71         usleep_range(10, 20);
  72         reset_control_deassert(dp->rst);
  73
  74         return 0;
  75 }
  76
  77 static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
  78 {
  79         struct rockchip_dp_device *dp = to_dp(plat_data);
  80         int ret;
  81
  82         ret = clk_prepare_enable(dp->pclk);
  83         if (ret < 0) {
  84                 dev_err(dp->dev, "failed to enable pclk %d\n", ret);
  85                 return ret;
  86         }
  87
  88         ret = rockchip_dp_pre_init(dp);
  89         if (ret < 0) {
  90                 dev_err(dp->dev, "failed to dp pre init %d\n", ret);
  91                 return ret;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
  98 {
  99         struct rockchip_dp_device *dp = to_dp(plat_data);
 100
 101         clk_disable_unprepare(dp->pclk);
 102
 103         return 0;
 104 }
 105
 106 static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
 107                                  struct drm_connector *connector)
 108 {
 109         struct drm_display_info *di = &connector->display_info;
 110
 111         if (di->color_formats & DRM_COLOR_FORMAT_YCRCB444 ||
 112             di->color_formats & DRM_COLOR_FORMAT_YCRCB422) {
 113                 di->color_formats &= ~(DRM_COLOR_FORMAT_YCRCB422 |
 114                                        DRM_COLOR_FORMAT_YCRCB444);
 115                 di->color_formats |= DRM_COLOR_FORMAT_RGB444;
 116                 di->bpc = 8;
 117         }
 118
 119         return 0;
 120 }
 121
 122 static bool
 123 rockchip_dp_drm_encoder_mode_fixup(struct drm_encoder *encoder,
 124                                    const struct drm_display_mode *mode,
 125                                    struct drm_display_mode *adjusted_mode)
 126 {
 127         /* do nothing */
 128         return true;
 129 }
 130
 131 static void rockchip_dp_drm_encoder_mode_set(struct drm_encoder *encoder,
 132                                              struct drm_display_mode *mode,
 133                                              struct drm_display_mode *adjusted)
 134 {
 135         /* do nothing */
 136 }
 137
 138 static void rockchip_dp_drm_encoder_enable(struct drm_encoder *encoder)
 139 {
 140         struct rockchip_dp_device *dp = to_dp(encoder);
 141         int ret;
 142         u32 val;
 143
 144         if (!dp->data->has_vop_sel)
 145                 return;
 146
 147         ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
 148         if (ret < 0)
 149                 return;
 150
 151         if (ret)
 152                 val = dp->data->lcdsel_lit;
 153         else
 154                 val = dp->data->lcdsel_big;
 155
 156         dev_dbg(dp->dev, "vop %s output to dp\n", (ret) ? "LIT" : "BIG");
 157
 158         ret = regmap_write(dp->grf, dp->data->lcdsel_grf_reg, val);
 159         if (ret != 0) {
 160                 dev_err(dp->dev, "Could not write to GRF: %d\n", ret);
 161                 return;
 162         }
 163 }
 164
 165 static void rockchip_dp_drm_encoder_nop(struct drm_encoder *encoder)
 166 {
 167         /* do nothing */
 168 }
 169
 170 static int
 171 rockchip_dp_drm_encoder_atomic_check(struct drm_encoder *encoder,
 172                                       struct drm_crtc_state *crtc_state,
 173                                       struct drm_connector_state *conn_state)
 174 {
 175         struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
 176         struct drm_connector *connector = conn_state->connector;
 177         struct drm_display_info *info = &connector->display_info;
 178
 179         /*
 180          * The hardware IC designed that VOP must output the RGB10 video
 181          * format to eDP contoller, and if eDP panel only support RGB8,
 182          * then eDP contoller should cut down the video data, not via VOP
 183          * contoller, that's why we need to hardcode the VOP output mode
 184          * to RGA10 here.
 185          */
 186         s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
 187         s->output_type = DRM_MODE_CONNECTOR_eDP;
 188         if (info->num_bus_formats)
 189                 s->bus_format = info->bus_formats[0];
 190
 191         return 0;
 192 }
 193
 194 static struct drm_encoder_helper_funcs rockchip_dp_encoder_helper_funcs = {
 195         .mode_fixup = rockchip_dp_drm_encoder_mode_fixup,
 196         .mode_set = rockchip_dp_drm_encoder_mode_set,
 197         .enable = rockchip_dp_drm_encoder_enable,
 198         .disable = rockchip_dp_drm_encoder_nop,
 199         .atomic_check = rockchip_dp_drm_encoder_atomic_check,
 200 };
 201
 202 static void rockchip_dp_drm_encoder_destroy(struct drm_encoder *encoder)
 203 {
 204         drm_encoder_cleanup(encoder);
 205 }
 206
 207 static struct drm_encoder_funcs rockchip_dp_encoder_funcs = {
 208         .destroy = rockchip_dp_drm_encoder_destroy,
 209 };
 210
 211 static int rockchip_dp_init(struct rockchip_dp_device *dp)
 212 {
 213         struct device *dev = dp->dev;
 214         struct device_node *np = dev->of_node;
 215         int ret;
 216
 217         dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 218         if (IS_ERR(dp->grf)) {
 219                 dev_err(dev, "failed to get rockchip,grf property\n");
 220                 return PTR_ERR(dp->grf);
 221         }
 222
 223         dp->pclk = devm_clk_get(dev, "pclk");
 224         if (IS_ERR(dp->pclk)) {
 225                 dev_err(dev, "failed to get pclk property\n");
 226                 return PTR_ERR(dp->pclk);
 227         }
 228
 229         dp->rst = devm_reset_control_get(dev, "dp");
 230         if (IS_ERR(dp->rst)) {
 231                 dev_err(dev, "failed to get dp reset control\n");
 232                 return PTR_ERR(dp->rst);
 233         }
 234
 235         ret = clk_prepare_enable(dp->pclk);
 236         if (ret < 0) {
 237                 dev_err(dp->dev, "failed to enable pclk %d\n", ret);
 238                 return ret;
 239         }
 240
 241         return 0;
 242 }
 243
 244 static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
 245 {
 246         struct drm_encoder *encoder = &dp->encoder;
 247         struct drm_device *drm_dev = dp->drm_dev;
 248         struct device *dev = dp->dev;
 249         int ret;
 250
 251         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
 252                                                              dev->of_node);
 253         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 254
 255         ret = drm_encoder_init(drm_dev, encoder, &rockchip_dp_encoder_funcs,
 256                                DRM_MODE_ENCODER_TMDS, NULL);
 257         if (ret) {
 258                 DRM_ERROR("failed to initialize encoder with drm\n");
 259                 return ret;
 260         }
 261
 262         drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
 263
 264         return 0;
 265 }
 266
 267 static int rockchip_dp_bind(struct device *dev, struct device *master,
 268                             void *data)
 269 {
 270         struct rockchip_dp_device *dp = dev_get_drvdata(dev);
 271         const struct rockchip_dp_chip_data *dp_data;
 272         struct device_node *panel_node, *port, *endpoint;
 273         struct drm_panel *panel = NULL;
 274         struct drm_device *drm_dev = data;
 275         int ret;
 276
 277         port = of_graph_get_port_by_id(dev->of_node, 1);
 278         if (port) {
 279                 endpoint = of_get_child_by_name(port, "endpoint");
 280                 of_node_put(port);
 281                 if (!endpoint) {
 282                         dev_err(dev, "no output endpoint found\n");
 283                         return -EINVAL;
 284                 }
 285
 286                 panel_node = of_graph_get_remote_port_parent(endpoint);
 287                 of_node_put(endpoint);
 288                 if (!panel_node) {
 289                         dev_err(dev, "no output node found\n");
 290                         return -EINVAL;
 291                 }
 292
 293                 panel = of_drm_find_panel(panel_node);
 294                 if (!panel) {
 295                         DRM_ERROR("failed to find panel\n");
 296                         of_node_put(panel_node);
 297                         return -EPROBE_DEFER;
 298                 }
 299                 of_node_put(panel_node);
 300         }
 301
 302         dp->plat_data.panel = panel;
 303         /*
 304          * Just like the probe function said, we don't need the
 305          * device drvrate anymore, we should leave the charge to
 306          * analogix dp driver, set the device drvdata to NULL.
 307          */
 308         dev_set_drvdata(dev, NULL);
 309
 310         dp_data = of_device_get_match_data(dev);
 311         if (!dp_data)
 312                 return -ENODEV;
 313
 314         ret = rockchip_dp_init(dp);
 315         if (ret < 0)
 316                 return ret;
 317
 318         dp->data = dp_data;
 319         dp->drm_dev = drm_dev;
 320
 321         ret = rockchip_dp_drm_create_encoder(dp);
 322         if (ret) {
 323                 DRM_ERROR("failed to create drm encoder\n");
 324                 return ret;
 325         }
 326
 327         dp->plat_data.encoder = &dp->encoder;
 328
 329         dp->plat_data.dev_type = ROCKCHIP_DP;
 330         dp->plat_data.subdev_type = dp_data->chip_type;
 331         dp->plat_data.power_on = rockchip_dp_poweron;
 332         dp->plat_data.power_off = rockchip_dp_powerdown;
 333         dp->plat_data.get_modes = rockchip_dp_get_modes;
 334
 335         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 336 }
 337
 338 static void rockchip_dp_unbind(struct device *dev, struct device *master,
 339                                void *data)
 340 {
 341         return analogix_dp_unbind(dev, master, data);
 342 }
 343
 344 static const struct component_ops rockchip_dp_component_ops = {
 345         .bind = rockchip_dp_bind,
 346         .unbind = rockchip_dp_unbind,
 347 };
 348
 349 static int rockchip_dp_probe(struct platform_device *pdev)
 350 {
 351         struct device *dev = &pdev->dev;
 352         struct rockchip_dp_device *dp;
 353
 354         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 355         if (!dp)
 356                 return -ENOMEM;
 357
 358         dp->dev = dev;
 359
 360         /*
 361          * We just use the drvdata until driver run into component
 362          * add function, and then we would set drvdata to null, so
 363          * that analogix dp driver could take charge of the drvdata.
 364          */
 365         platform_set_drvdata(pdev, dp);
 366
 367         return component_add(dev, &rockchip_dp_component_ops);
 368 }
 369
 370 static int rockchip_dp_remove(struct platform_device *pdev)
 371 {
 372         component_del(&pdev->dev, &rockchip_dp_component_ops);
 373
 374         return 0;
 375 }
 376
 377 static const struct dev_pm_ops rockchip_dp_pm_ops = {
 378 #ifdef CONFIG_PM_SLEEP
 379         .suspend = analogix_dp_suspend,
 380         .resume_early = analogix_dp_resume,
 381 #endif
 382 };
 383
 384 static const struct rockchip_dp_chip_data rk3399_edp = {
 385         .lcdsel_grf_reg = 0x6250,
 386         .lcdsel_big = 0 | BIT(21),
 387         .lcdsel_lit = BIT(5) | BIT(21),
 388         .chip_type = RK3399_EDP,
 389         .has_vop_sel = true,
 390 };
 391
 392 static const struct rockchip_dp_chip_data rk3368_edp = {
 393         .chip_type = RK3368_EDP,
 394 };
 395
 396 static const struct rockchip_dp_chip_data rk3288_dp = {
 397         .lcdsel_grf_reg = 0x025c,
 398         .lcdsel_big = 0 | BIT(21),
 399         .lcdsel_lit = BIT(5) | BIT(21),
 400         .chip_type = RK3288_DP,
 401         .has_vop_sel = true,
 402 };
 403
 404 static const struct of_device_id rockchip_dp_dt_ids[] = {
 405         {.compatible = "rockchip,rk3288-dp", .data = &rk3288_dp },
 406         {.compatible = "rockchip,rk3368-edp", .data = &rk3368_edp },
 407         {.compatible = "rockchip,rk3399-edp", .data = &rk3399_edp },
 408         {}
 409 };
 410 MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
 411
 412 static struct platform_driver rockchip_dp_driver = {
 413         .probe = rockchip_dp_probe,
 414         .remove = rockchip_dp_remove,
 415         .driver = {
 416                    .name = "rockchip-dp",
 417                    .owner = THIS_MODULE,
 418                    .pm = &rockchip_dp_pm_ops,
 419                    .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
 420         },
 421 };
 422
 423 module_platform_driver(rockchip_dp_driver);
 424
 425 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
 426 MODULE_AUTHOR("Jeff chen <jeff.chen@rock-chips.com>");
 427 MODULE_DESCRIPTION("Rockchip Specific Analogix-DP Driver Extension");
 428 MODULE_LICENSE("GPL v2");