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_of.h>
  27 #include <drm/drm_panel.h>
  28
  29 #include <drm/bridge/analogix_dp.h>
  30 #include <drm/exynos_drm.h>
  31
  32 #include "exynos_drm_crtc.h"
  33
  34 #define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)
  35
  36 struct exynos_dp_device {
  37         struct drm_encoder         encoder;
  38         struct drm_connector       *connector;
  39         struct drm_bridge          *ptn_bridge;
  40         struct drm_device          *drm_dev;
  41         struct device              *dev;
  42
  43         struct videomode           vm;
  44         struct analogix_dp_plat_data plat_data;
  45 };
  46
  47 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
  48                                 bool enable)
  49 {
  50         struct exynos_dp_device *dp = to_dp(plat_data);
  51         struct drm_encoder *encoder = &dp->encoder;
  52
  53         if (!encoder->crtc)
  54                 return -EPERM;
  55
  56         exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
  57
  58         return 0;
  59 }
  60
  61 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
  62 {
  63         return exynos_dp_crtc_clock_enable(plat_data, true);
  64 }
  65
  66 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
  67 {
  68         return exynos_dp_crtc_clock_enable(plat_data, false);
  69 }
  70
  71 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
  72                                struct drm_connector *connector)
  73 {
  74         struct exynos_dp_device *dp = to_dp(plat_data);
  75         struct drm_display_mode *mode;
  76         int num_modes = 0;
  77
  78         if (dp->plat_data.panel)
  79                 return num_modes;
  80
  81         mode = drm_mode_create(connector->dev);
  82         if (!mode) {
  83                 DRM_ERROR("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_ERROR("Failed to attach bridge to drm\n");
 112                         bridge->next = NULL;
 113                         return ret;
 114                 }
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void exynos_dp_mode_set(struct drm_encoder *encoder,
 121                                struct drm_display_mode *mode,
 122                                struct drm_display_mode *adjusted_mode)
 123 {
 124 }
 125
 126 static void exynos_dp_nop(struct drm_encoder *encoder)
 127 {
 128         /* do nothing */
 129 }
 130
 131 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
 132         .mode_set = exynos_dp_mode_set,
 133         .enable = exynos_dp_nop,
 134         .disable = exynos_dp_nop,
 135 };
 136
 137 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
 138         .destroy = drm_encoder_cleanup,
 139 };
 140
 141 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 142 {
 143         int ret;
 144
 145         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 146         if (ret) {
 147                 DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
 148                 return ret;
 149         }
 150         return 0;
 151 }
 152
 153 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 154 {
 155         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 156         struct drm_encoder *encoder = &dp->encoder;
 157         struct drm_device *drm_dev = data;
 158         int pipe, ret;
 159
 160         /*
 161          * Just like the probe function said, we don't need the
 162          * device drvrate anymore, we should leave the charge to
 163          * analogix dp driver, set the device drvdata to NULL.
 164          */
 165         dev_set_drvdata(dev, NULL);
 166
 167         dp->dev = dev;
 168         dp->drm_dev = drm_dev;
 169
 170         dp->plat_data.dev_type = EXYNOS_DP;
 171         dp->plat_data.power_on = exynos_dp_poweron;
 172         dp->plat_data.power_off = exynos_dp_poweroff;
 173         dp->plat_data.attach = exynos_dp_bridge_attach;
 174         dp->plat_data.get_modes = exynos_dp_get_modes;
 175
 176         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 177                 ret = exynos_dp_dt_parse_panel(dp);
 178                 if (ret)
 179                         return ret;
 180         }
 181
 182         pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
 183                                                   EXYNOS_DISPLAY_TYPE_LCD);
 184         if (pipe < 0)
 185                 return pipe;
 186
 187         encoder->possible_crtcs = 1 << pipe;
 188
 189         DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
 190
 191         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 192                          DRM_MODE_ENCODER_TMDS, NULL);
 193
 194         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 195
 196         dp->plat_data.encoder = encoder;
 197
 198         return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
 199 }
 200
 201 static void exynos_dp_unbind(struct device *dev, struct device *master,
 202                              void *data)
 203 {
 204         return analogix_dp_unbind(dev, master, data);
 205 }
 206
 207 static const struct component_ops exynos_dp_ops = {
 208         .bind   = exynos_dp_bind,
 209         .unbind = exynos_dp_unbind,
 210 };
 211
 212 static int exynos_dp_probe(struct platform_device *pdev)
 213 {
 214         struct device *dev = &pdev->dev;
 215         struct device_node *np;
 216         struct exynos_dp_device *dp;
 217         struct drm_panel *panel;
 218         struct drm_bridge *bridge;
 219         int ret;
 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         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 244         if (ret)
 245                 return ret;
 246
 247         /* The remote port can be either a panel or a bridge */
 248         dp->plat_data.panel = panel;
 249         dp->ptn_bridge = bridge;
 250
 251 out:
 252         return component_add(&pdev->dev, &exynos_dp_ops);
 253 }
 254
 255 static int exynos_dp_remove(struct platform_device *pdev)
 256 {
 257         component_del(&pdev->dev, &exynos_dp_ops);
 258
 259         return 0;
 260 }
 261
 262 #ifdef CONFIG_PM
 263 static int exynos_dp_suspend(struct device *dev)
 264 {
 265         return analogix_dp_suspend(dev);
 266 }
 267
 268 static int exynos_dp_resume(struct device *dev)
 269 {
 270         return analogix_dp_resume(dev);
 271 }
 272 #endif
 273
 274 static const struct dev_pm_ops exynos_dp_pm_ops = {
 275         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 276 };
 277
 278 static const struct of_device_id exynos_dp_match[] = {
 279         { .compatible = "samsung,exynos5-dp" },
 280         {},
 281 };
 282 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 283
 284 struct platform_driver dp_driver = {
 285         .probe          = exynos_dp_probe,
 286         .remove         = exynos_dp_remove,
 287         .driver         = {
 288                 .name   = "exynos-dp",
 289                 .owner  = THIS_MODULE,
 290                 .pm     = &exynos_dp_pm_ops,
 291                 .of_match_table = exynos_dp_match,
 292         },
 293 };
 294
 295 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 296 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 297 MODULE_LICENSE("GPL v2");