drivers/gpu/drm/exynos/exynos_dp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Samsung SoC DP (Display Port) interface driver.
   4  *
   5  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
   6  * Author: Jingoo Han <jg1.han@samsung.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/err.h>
  12 #include <linux/clk.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/component.h>
  15 #include <linux/pm_runtime.h>
  16 #include <video/of_display_timing.h>
  17 #include <video/of_videomode.h>
  18 #include <video/videomode.h>
  19
  20 #include <drm/drmP.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_crtc.h>
  23 #include <drm/drm_of.h>
  24 #include <drm/drm_panel.h>
  25 #include <drm/drm_probe_helper.h>
  26
  27 #include <drm/bridge/analogix_dp.h>
  28 #include <drm/exynos_drm.h>
  29
  30 #include "exynos_drm_crtc.h"
  31
  32 #define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)
  33
  34 struct exynos_dp_device {
  35         struct drm_encoder         encoder;
  36         struct drm_connector       *connector;
  37         struct drm_bridge          *ptn_bridge;
  38         struct drm_device          *drm_dev;
  39         struct device              *dev;
  40
  41         struct videomode           vm;
  42         struct analogix_dp_device *adp;
  43         struct analogix_dp_plat_data plat_data;
  44 };
  45
  46 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
  47                                 bool enable)
  48 {
  49         struct exynos_dp_device *dp = to_dp(plat_data);
  50         struct drm_encoder *encoder = &dp->encoder;
  51
  52         if (!encoder->crtc)
  53                 return -EPERM;
  54
  55         exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
  56
  57         return 0;
  58 }
  59
  60 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
  61 {
  62         return exynos_dp_crtc_clock_enable(plat_data, true);
  63 }
  64
  65 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
  66 {
  67         return exynos_dp_crtc_clock_enable(plat_data, false);
  68 }
  69
  70 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
  71                                struct drm_connector *connector)
  72 {
  73         struct exynos_dp_device *dp = to_dp(plat_data);
  74         struct drm_display_mode *mode;
  75         int num_modes = 0;
  76
  77         if (dp->plat_data.panel)
  78                 return num_modes;
  79
  80         mode = drm_mode_create(connector->dev);
  81         if (!mode) {
  82                 DRM_DEV_ERROR(dp->dev,
  83                               "failed to create a new display mode.\n");
  84                 return num_modes;
  85         }
  86
  87         drm_display_mode_from_videomode(&dp->vm, mode);
  88         connector->display_info.width_mm = mode->width_mm;
  89         connector->display_info.height_mm = mode->height_mm;
  90
  91         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  92         drm_mode_set_name(mode);
  93         drm_mode_probed_add(connector, mode);
  94
  95         return num_modes + 1;
  96 }
  97
  98 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
  99                                    struct drm_bridge *bridge,
 100                                    struct drm_connector *connector)
 101 {
 102         struct exynos_dp_device *dp = to_dp(plat_data);
 103         int ret;
 104
 105         dp->connector = connector;
 106
 107         /* Pre-empt DP connector creation if there's a bridge */
 108         if (dp->ptn_bridge) {
 109                 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge);
 110                 if (ret) {
 111                         DRM_DEV_ERROR(dp->dev,
 112                                       "Failed to attach bridge to drm\n");
 113                         bridge->next = NULL;
 114                         return ret;
 115                 }
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 122                                struct drm_display_mode *mode,
 123                                struct drm_display_mode *adjusted_mode)
 124 {
 125 }
 126
 127 static void exynos_dp_nop(struct drm_encoder *encoder)
 128 {
 129         /* do nothing */
 130 }
 131
 132 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 133         .mode_set = exynos_dp_mode_set,
 134         .enable = exynos_dp_nop,
 135         .disable = exynos_dp_nop,
 136 };
 137
 138 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
 139         .destroy = drm_encoder_cleanup,
 140 };
 141
 142 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 143 {
 144         int ret;
 145
 146         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 147         if (ret) {
 148                 DRM_DEV_ERROR(dp->dev,
 149                               "failed: of_get_videomode() : %d\n", ret);
 150                 return ret;
 151         }
 152         return 0;
 153 }
 154
 155 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 156 {
 157         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 158         struct drm_encoder *encoder = &dp->encoder;
 159         struct drm_device *drm_dev = data;
 160         int ret;
 161
 162         dp->dev = dev;
 163         dp->drm_dev = drm_dev;
 164
 165         dp->plat_data.dev_type = EXYNOS_DP;
 166         dp->plat_data.power_on_start = exynos_dp_poweron;
 167         dp->plat_data.power_off = exynos_dp_poweroff;
 168         dp->plat_data.attach = exynos_dp_bridge_attach;
 169         dp->plat_data.get_modes = exynos_dp_get_modes;
 170
 171         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 172                 ret = exynos_dp_dt_parse_panel(dp);
 173                 if (ret)
 174                         return ret;
 175         }
 176
 177         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 178                          DRM_MODE_ENCODER_TMDS, NULL);
 179
 180         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 181
 182         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 183         if (ret < 0)
 184                 return ret;
 185
 186         dp->plat_data.encoder = encoder;
 187
 188         dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 189         if (IS_ERR(dp->adp)) {
 190                 dp->encoder.funcs->destroy(&dp->encoder);
 191                 return PTR_ERR(dp->adp);
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void exynos_dp_unbind(struct device *dev, struct device *master,
 198                              void *data)
 199 {
 200         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 201
 202         analogix_dp_unbind(dp->adp);
 203         dp->encoder.funcs->destroy(&dp->encoder);
 204 }
 205
 206 static const struct component_ops exynos_dp_ops = {
 207         .bind   = exynos_dp_bind,
 208         .unbind = exynos_dp_unbind,
 209 };
 210
 211 static int exynos_dp_probe(struct platform_device *pdev)
 212 {
 213         struct device *dev = &pdev->dev;
 214         struct device_node *np;
 215         struct exynos_dp_device *dp;
 216         struct drm_panel *panel;
 217         struct drm_bridge *bridge;
 218         int ret;
 219
 220         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 221                           GFP_KERNEL);
 222         if (!dp)
 223                 return -ENOMEM;
 224
 225         /*
 226          * We just use the drvdata until driver run into component
 227          * add function, and then we would set drvdata to null, so
 228          * that analogix dp driver would take charge of the drvdata.
 229          */
 230         platform_set_drvdata(pdev, dp);
 231
 232         /* This is for the backward compatibility. */
 233         np = of_parse_phandle(dev->of_node, "panel", 0);
 234         if (np) {
 235                 dp->plat_data.panel = of_drm_find_panel(np);
 236
 237                 of_node_put(np);
 238                 if (IS_ERR(dp->plat_data.panel))
 239                         return PTR_ERR(dp->plat_data.panel);
 240
 241                 goto out;
 242         }
 243
 244         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 245         if (ret)
 246                 return ret;
 247
 248         /* The remote port can be either a panel or a bridge */
 249         dp->plat_data.panel = panel;
 250         dp->plat_data.skip_connector = !!bridge;
 251         dp->ptn_bridge = bridge;
 252
 253 out:
 254         return component_add(&pdev->dev, &exynos_dp_ops);
 255 }
 256
 257 static int exynos_dp_remove(struct platform_device *pdev)
 258 {
 259         component_del(&pdev->dev, &exynos_dp_ops);
 260
 261         return 0;
 262 }
 263
 264 #ifdef CONFIG_PM
 265 static int exynos_dp_suspend(struct device *dev)
 266 {
 267         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 268
 269         return analogix_dp_suspend(dp->adp);
 270 }
 271
 272 static int exynos_dp_resume(struct device *dev)
 273 {
 274         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 275
 276         return analogix_dp_resume(dp->adp);
 277 }
 278 #endif
 279
 280 static const struct dev_pm_ops exynos_dp_pm_ops = {
 281         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 282         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 283                                 pm_runtime_force_resume)
 284 };
 285
 286 static const struct of_device_id exynos_dp_match[] = {
 287         { .compatible = "samsung,exynos5-dp" },
 288         {},
 289 };
 290 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 291
 292 struct platform_driver dp_driver = {
 293         .probe          = exynos_dp_probe,
 294         .remove         = exynos_dp_remove,
 295         .driver         = {
 296                 .name   = "exynos-dp",
 297                 .owner  = THIS_MODULE,
 298                 .pm     = &exynos_dp_pm_ops,
 299                 .of_match_table = exynos_dp_match,
 300         },
 301 };
 302
 303 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 304 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 305 MODULE_LICENSE("GPL v2");