drivers/gpu/drm/exynos/exynos_dp.c

   1 /*
   2  * Samsung SoC DP (Display Port) interface driver.
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
   5  * Author: Jingoo Han <jg1.han@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/err.h>
  16 #include <linux/clk.h>
  17 #include <linux/of_graph.h>
  18 #include <linux/component.h>
  19 #include <video/of_display_timing.h>
  20 #include <video/of_videomode.h>
  21 #include <video/videomode.h>
  22
  23 #include <drm/drmP.h>
  24 #include <drm/drm_crtc.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_panel.h>
  27
  28 #include <drm/bridge/analogix_dp.h>
  29 #include <drm/exynos_drm.h>
  30
  31 #include "exynos_drm_crtc.h"
  32
  33 #define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)
  34
  35 struct exynos_dp_device {
  36         struct drm_encoder         encoder;
  37         struct drm_connector       connector;
  38         struct drm_bridge          *ptn_bridge;
  39         struct drm_device          *drm_dev;
  40         struct device              *dev;
  41
  42         struct videomode           vm;
  43         struct analogix_dp_plat_data plat_data;
  44 };
  45
  46 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 {
  72         struct exynos_dp_device *dp = to_dp(plat_data);
  73         struct drm_connector *connector = &dp->connector;
  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_ERROR("failed to create a new display mode.\n");
  83                 return num_modes;
  84         }
  85
  86         drm_display_mode_from_videomode(&dp->vm, mode);
  87         connector->display_info.width_mm = mode->width_mm;
  88         connector->display_info.height_mm = mode->height_mm;
  89
  90         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  91         drm_mode_set_name(mode);
  92         drm_mode_probed_add(connector, mode);
  93
  94         return num_modes + 1;
  95 }
  96
  97 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
  98                                    struct drm_bridge *bridge,
  99                                    struct drm_connector *connector)
 100 {
 101         struct exynos_dp_device *dp = to_dp(plat_data);
 102         struct drm_encoder *encoder = &dp->encoder;
 103         int ret;
 104
 105         drm_connector_register(connector);
 106
 107         /* Pre-empt DP connector creation if there's a bridge */
 108         if (dp->ptn_bridge) {
 109                 bridge->next = dp->ptn_bridge;
 110                 dp->ptn_bridge->encoder = encoder;
 111                 ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge);
 112                 if (ret) {
 113                         DRM_ERROR("Failed to attach bridge to drm\n");
 114                         bridge->next = NULL;
 115                         return ret;
 116                 }
 117         }
 118
 119         return 0;
 120 }
 121
 122 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 123                                struct drm_display_mode *mode,
 124                                struct drm_display_mode *adjusted_mode)
 125 {
 126 }
 127
 128 static void exynos_dp_nop(struct drm_encoder *encoder)
 129 {
 130         /* do nothing */
 131 }
 132
 133 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 134         .mode_set = exynos_dp_mode_set,
 135         .enable = exynos_dp_nop,
 136         .disable = exynos_dp_nop,
 137 };
 138
 139 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
 140         .destroy = drm_encoder_cleanup,
 141 };
 142
 143 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 144 {
 145         int ret;
 146
 147         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 148         if (ret) {
 149                 DRM_ERROR("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 pipe, ret;
 161
 162         /*
 163          * Just like the probe function said, we don't need the
 164          * device drvrate anymore, we should leave the charge to
 165          * analogix dp driver, set the device drvdata to NULL.
 166          */
 167         dev_set_drvdata(dev, NULL);
 168
 169         dp->dev = dev;
 170         dp->drm_dev = drm_dev;
 171
 172         dp->plat_data.dev_type = EXYNOS_DP;
 173         dp->plat_data.power_on = exynos_dp_poweron;
 174         dp->plat_data.power_off = exynos_dp_poweroff;
 175         dp->plat_data.attach = exynos_dp_bridge_attach;
 176         dp->plat_data.get_modes = exynos_dp_get_modes;
 177
 178         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 179                 ret = exynos_dp_dt_parse_panel(dp);
 180                 if (ret)
 181                         return ret;
 182         }
 183
 184         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
 185                                                   EXYNOS_DISPLAY_TYPE_LCD);
 186         if (pipe < 0)
 187                 return pipe;
 188
 189         encoder->possible_crtcs = 1 << pipe;
 190
 191         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 192
 193         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 194                          DRM_MODE_ENCODER_TMDS, NULL);
 195
 196         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 197
 198         dp->plat_data.encoder = encoder;
 199
 200         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 201 }
 202
 203 static void exynos_dp_unbind(struct device *dev, struct device *master,
 204                              void *data)
 205 {
 206         return analogix_dp_unbind(dev, master, data);
 207 }
 208
 209 static const struct component_ops exynos_dp_ops = {
 210         .bind   = exynos_dp_bind,
 211         .unbind = exynos_dp_unbind,
 212 };
 213
 214 static int exynos_dp_probe(struct platform_device *pdev)
 215 {
 216         struct device *dev = &pdev->dev;
 217         struct device_node *np = NULL, *endpoint = NULL;
 218         struct exynos_dp_device *dp;
 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                 of_node_put(np);
 237                 if (!dp->plat_data.panel)
 238                         return -EPROBE_DEFER;
 239                 goto out;
 240         }
 241
 242         endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
 243         if (endpoint) {
 244                 np = of_graph_get_remote_port_parent(endpoint);
 245                 if (np) {
 246                         /* The remote port can be either a panel or a bridge */
 247                         dp->plat_data.panel = of_drm_find_panel(np);
 248                         if (!dp->plat_data.panel) {
 249                                 dp->ptn_bridge = of_drm_find_bridge(np);
 250                                 if (!dp->ptn_bridge) {
 251                                         of_node_put(np);
 252                                         return -EPROBE_DEFER;
 253                                 }
 254                         }
 255                         of_node_put(np);
 256                 } else {
 257                         DRM_ERROR("no remote endpoint device node found.\n");
 258                         return -EINVAL;
 259                 }
 260         } else {
 261                 DRM_ERROR("no port endpoint subnode found.\n");
 262                 return -EINVAL;
 263         }
 264
 265 out:
 266         return component_add(&pdev->dev, &exynos_dp_ops);
 267 }
 268
 269 static int exynos_dp_remove(struct platform_device *pdev)
 270 {
 271         component_del(&pdev->dev, &exynos_dp_ops);
 272
 273         return 0;
 274 }
 275
 276 #ifdef CONFIG_PM
 277 static int exynos_dp_suspend(struct device *dev)
 278 {
 279         return analogix_dp_suspend(dev);
 280 }
 281
 282 static int exynos_dp_resume(struct device *dev)
 283 {
 284         return analogix_dp_resume(dev);
 285 }
 286 #endif
 287
 288 static const struct dev_pm_ops exynos_dp_pm_ops = {
 289         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 290 };
 291
 292 static const struct of_device_id exynos_dp_match[] = {
 293         { .compatible = "samsung,exynos5-dp" },
 294         {},
 295 };
 296 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 297
 298 struct platform_driver dp_driver = {
 299         .probe          = exynos_dp_probe,
 300         .remove         = exynos_dp_remove,
 301         .driver         = {
 302                 .name   = "exynos-dp",
 303                 .owner  = THIS_MODULE,
 304                 .pm     = &exynos_dp_pm_ops,
 305                 .of_match_table = exynos_dp_match,
 306         },
 307 };
 308
 309 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 310 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 311 MODULE_LICENSE("GPL v2");