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         dp->connector = connector;
 107
 108         /* Pre-empt DP connector creation if there's a bridge */
 109         if (dp->ptn_bridge) {
 110                 bridge->next = dp->ptn_bridge;
 111                 dp->ptn_bridge->encoder = encoder;
 112                 ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge);
 113                 if (ret) {
 114                         DRM_ERROR("Failed to attach bridge to drm\n");
 115                         bridge->next = NULL;
 116                         return ret;
 117                 }
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 124                                struct drm_display_mode *mode,
 125                                struct drm_display_mode *adjusted_mode)
 126 {
 127 }
 128
 129 static void exynos_dp_nop(struct drm_encoder *encoder)
 130 {
 131         /* do nothing */
 132 }
 133
 134 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 135         .mode_set = exynos_dp_mode_set,
 136         .enable = exynos_dp_nop,
 137         .disable = exynos_dp_nop,
 138 };
 139
 140 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
 141         .destroy = drm_encoder_cleanup,
 142 };
 143
 144 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 145 {
 146         int ret;
 147
 148         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 149         if (ret) {
 150                 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
 151                 return ret;
 152         }
 153         return 0;
 154 }
 155
 156 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 157 {
 158         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 159         struct drm_encoder *encoder = &dp->encoder;
 160         struct drm_device *drm_dev = data;
 161         int pipe, ret;
 162
 163         /*
 164          * Just like the probe function said, we don't need the
 165          * device drvrate anymore, we should leave the charge to
 166          * analogix dp driver, set the device drvdata to NULL.
 167          */
 168         dev_set_drvdata(dev, NULL);
 169
 170         dp->dev = dev;
 171         dp->drm_dev = drm_dev;
 172
 173         dp->plat_data.dev_type = EXYNOS_DP;
 174         dp->plat_data.power_on = exynos_dp_poweron;
 175         dp->plat_data.power_off = exynos_dp_poweroff;
 176         dp->plat_data.attach = exynos_dp_bridge_attach;
 177         dp->plat_data.get_modes = exynos_dp_get_modes;
 178
 179         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 180                 ret = exynos_dp_dt_parse_panel(dp);
 181                 if (ret)
 182                         return ret;
 183         }
 184
 185         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
 186                                                   EXYNOS_DISPLAY_TYPE_LCD);
 187         if (pipe < 0)
 188                 return pipe;
 189
 190         encoder->possible_crtcs = 1 << pipe;
 191
 192         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 193
 194         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 195                          DRM_MODE_ENCODER_TMDS, NULL);
 196
 197         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 198
 199         dp->plat_data.encoder = encoder;
 200
 201         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 202 }
 203
 204 static void exynos_dp_unbind(struct device *dev, struct device *master,
 205                              void *data)
 206 {
 207         return analogix_dp_unbind(dev, master, data);
 208 }
 209
 210 static const struct component_ops exynos_dp_ops = {
 211         .bind   = exynos_dp_bind,
 212         .unbind = exynos_dp_unbind,
 213 };
 214
 215 static int exynos_dp_probe(struct platform_device *pdev)
 216 {
 217         struct device *dev = &pdev->dev;
 218         struct device_node *np = NULL, *endpoint = NULL;
 219         struct exynos_dp_device *dp;
 220
 221         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 222                           GFP_KERNEL);
 223         if (!dp)
 224                 return -ENOMEM;
 225
 226         /*
 227          * We just use the drvdata until driver run into component
 228          * add function, and then we would set drvdata to null, so
 229          * that analogix dp driver would take charge of the drvdata.
 230          */
 231         platform_set_drvdata(pdev, dp);
 232
 233         /* This is for the backward compatibility. */
 234         np = of_parse_phandle(dev->of_node, "panel", 0);
 235         if (np) {
 236                 dp->plat_data.panel = of_drm_find_panel(np);
 237                 of_node_put(np);
 238                 if (!dp->plat_data.panel)
 239                         return -EPROBE_DEFER;
 240                 goto out;
 241         }
 242
 243         endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
 244         if (endpoint) {
 245                 np = of_graph_get_remote_port_parent(endpoint);
 246                 if (np) {
 247                         /* The remote port can be either a panel or a bridge */
 248                         dp->plat_data.panel = of_drm_find_panel(np);
 249                         if (!dp->plat_data.panel) {
 250                                 dp->ptn_bridge = of_drm_find_bridge(np);
 251                                 if (!dp->ptn_bridge) {
 252                                         of_node_put(np);
 253                                         return -EPROBE_DEFER;
 254                                 }
 255                         }
 256                         of_node_put(np);
 257                 } else {
 258                         DRM_ERROR("no remote endpoint device node found.\n");
 259                         return -EINVAL;
 260                 }
 261         } else {
 262                 DRM_ERROR("no port endpoint subnode found.\n");
 263                 return -EINVAL;
 264         }
 265
 266 out:
 267         return component_add(&pdev->dev, &exynos_dp_ops);
 268 }
 269
 270 static int exynos_dp_remove(struct platform_device *pdev)
 271 {
 272         component_del(&pdev->dev, &exynos_dp_ops);
 273
 274         return 0;
 275 }
 276
 277 #ifdef CONFIG_PM
 278 static int exynos_dp_suspend(struct device *dev)
 279 {
 280         return analogix_dp_suspend(dev);
 281 }
 282
 283 static int exynos_dp_resume(struct device *dev)
 284 {
 285         return analogix_dp_resume(dev);
 286 }
 287 #endif
 288
 289 static const struct dev_pm_ops exynos_dp_pm_ops = {
 290         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 291 };
 292
 293 static const struct of_device_id exynos_dp_match[] = {
 294         { .compatible = "samsung,exynos5-dp" },
 295         {},
 296 };
 297 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 298
 299 struct platform_driver dp_driver = {
 300         .probe          = exynos_dp_probe,
 301         .remove         = exynos_dp_remove,
 302         .driver         = {
 303                 .name   = "exynos-dp",
 304                 .owner  = THIS_MODULE,
 305                 .pm     = &exynos_dp_pm_ops,
 306                 .of_match_table = exynos_dp_match,
 307         },
 308 };
 309
 310 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 311 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 312 MODULE_LICENSE("GPL v2");