root/drivers/gpu/drm/exynos/exynos_dp.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. exynos_dp_crtc_clock_enable
  2. exynos_dp_poweron
  3. exynos_dp_poweroff
  4. exynos_dp_get_modes
  5. exynos_dp_bridge_attach
  6. exynos_dp_mode_set
  7. exynos_dp_nop
  8. exynos_dp_dt_parse_panel
  9. exynos_dp_bind
  10. exynos_dp_unbind
  11. exynos_dp_probe
  12. exynos_dp_remove
  13. exynos_dp_suspend
  14. exynos_dp_resume

   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/clk.h>
  10 #include <linux/component.h>
  11 #include <linux/err.h>
  12 #include <linux/module.h>
  13 #include <linux/of_graph.h>
  14 #include <linux/platform_device.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/bridge/analogix_dp.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_print.h>
  26 #include <drm/drm_probe_helper.h>
  27 #include <drm/exynos_drm.h>
  28 
  29 #include "exynos_drm_crtc.h"
  30 
  31 #define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)
  32 
  33 struct exynos_dp_device {
  34         struct drm_encoder         encoder;
  35         struct drm_connector       *connector;
  36         struct drm_bridge          *ptn_bridge;
  37         struct drm_device          *drm_dev;
  38         struct device              *dev;
  39 
  40         struct videomode           vm;
  41         struct analogix_dp_device *adp;
  42         struct analogix_dp_plat_data plat_data;
  43 };
  44 
  45 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
  46                                 bool enable)
  47 {
  48         struct exynos_dp_device *dp = to_dp(plat_data);
  49         struct drm_encoder *encoder = &dp->encoder;
  50 
  51         if (!encoder->crtc)
  52                 return -EPERM;
  53 
  54         exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
  55 
  56         return 0;
  57 }
  58 
  59 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
  60 {
  61         return exynos_dp_crtc_clock_enable(plat_data, true);
  62 }
  63 
  64 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
  65 {
  66         return exynos_dp_crtc_clock_enable(plat_data, false);
  67 }
  68 
  69 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
  70                                struct drm_connector *connector)
  71 {
  72         struct exynos_dp_device *dp = to_dp(plat_data);
  73         struct drm_display_mode *mode;
  74         int num_modes = 0;
  75 
  76         if (dp->plat_data.panel)
  77                 return num_modes;
  78 
  79         mode = drm_mode_create(connector->dev);
  80         if (!mode) {
  81                 DRM_DEV_ERROR(dp->dev,
  82                               "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         int ret;
 103 
 104         dp->connector = connector;
 105 
 106         /* Pre-empt DP connector creation if there's a bridge */
 107         if (dp->ptn_bridge) {
 108                 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge);
 109                 if (ret) {
 110                         DRM_DEV_ERROR(dp->dev,
 111                                       "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_DEV_ERROR(dp->dev,
 148                               "failed: of_get_videomode() : %d\n", ret);
 149                 return ret;
 150         }
 151         return 0;
 152 }
 153 
 154 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 155 {
 156         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 157         struct drm_encoder *encoder = &dp->encoder;
 158         struct drm_device *drm_dev = data;
 159         int ret;
 160 
 161         dp->drm_dev = drm_dev;
 162 
 163         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 164                 ret = exynos_dp_dt_parse_panel(dp);
 165                 if (ret)
 166                         return ret;
 167         }
 168 
 169         drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
 170                          DRM_MODE_ENCODER_TMDS, NULL);
 171 
 172         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 173 
 174         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 175         if (ret < 0)
 176                 return ret;
 177 
 178         dp->plat_data.encoder = encoder;
 179 
 180         ret = analogix_dp_bind(dp->adp, dp->drm_dev);
 181         if (ret)
 182                 dp->encoder.funcs->destroy(&dp->encoder);
 183 
 184         return ret;
 185 }
 186 
 187 static void exynos_dp_unbind(struct device *dev, struct device *master,
 188                              void *data)
 189 {
 190         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 191 
 192         analogix_dp_unbind(dp->adp);
 193         dp->encoder.funcs->destroy(&dp->encoder);
 194 }
 195 
 196 static const struct component_ops exynos_dp_ops = {
 197         .bind   = exynos_dp_bind,
 198         .unbind = exynos_dp_unbind,
 199 };
 200 
 201 static int exynos_dp_probe(struct platform_device *pdev)
 202 {
 203         struct device *dev = &pdev->dev;
 204         struct device_node *np;
 205         struct exynos_dp_device *dp;
 206         struct drm_panel *panel;
 207         struct drm_bridge *bridge;
 208         int ret;
 209 
 210         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 211                           GFP_KERNEL);
 212         if (!dp)
 213                 return -ENOMEM;
 214 
 215         dp->dev = dev;
 216         /*
 217          * We just use the drvdata until driver run into component
 218          * add function, and then we would set drvdata to null, so
 219          * that analogix dp driver would take charge of the drvdata.
 220          */
 221         platform_set_drvdata(pdev, dp);
 222 
 223         /* This is for the backward compatibility. */
 224         np = of_parse_phandle(dev->of_node, "panel", 0);
 225         if (np) {
 226                 dp->plat_data.panel = of_drm_find_panel(np);
 227 
 228                 of_node_put(np);
 229                 if (IS_ERR(dp->plat_data.panel))
 230                         return PTR_ERR(dp->plat_data.panel);
 231 
 232                 goto out;
 233         }
 234 
 235         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 236         if (ret)
 237                 return ret;
 238 
 239         /* The remote port can be either a panel or a bridge */
 240         dp->plat_data.panel = panel;
 241         dp->plat_data.dev_type = EXYNOS_DP;
 242         dp->plat_data.power_on_start = exynos_dp_poweron;
 243         dp->plat_data.power_off = exynos_dp_poweroff;
 244         dp->plat_data.attach = exynos_dp_bridge_attach;
 245         dp->plat_data.get_modes = exynos_dp_get_modes;
 246         dp->plat_data.skip_connector = !!bridge;
 247 
 248         dp->ptn_bridge = bridge;
 249 
 250 out:
 251         dp->adp = analogix_dp_probe(dev, &dp->plat_data);
 252         if (IS_ERR(dp->adp))
 253                 return PTR_ERR(dp->adp);
 254 
 255         return component_add(&pdev->dev, &exynos_dp_ops);
 256 }
 257 
 258 static int exynos_dp_remove(struct platform_device *pdev)
 259 {
 260         struct exynos_dp_device *dp = platform_get_drvdata(pdev);
 261 
 262         component_del(&pdev->dev, &exynos_dp_ops);
 263         analogix_dp_remove(dp->adp);
 264 
 265         return 0;
 266 }
 267 
 268 #ifdef CONFIG_PM
 269 static int exynos_dp_suspend(struct device *dev)
 270 {
 271         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 272 
 273         return analogix_dp_suspend(dp->adp);
 274 }
 275 
 276 static int exynos_dp_resume(struct device *dev)
 277 {
 278         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 279 
 280         return analogix_dp_resume(dp->adp);
 281 }
 282 #endif
 283 
 284 static const struct dev_pm_ops exynos_dp_pm_ops = {
 285         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 286         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 287                                 pm_runtime_force_resume)
 288 };
 289 
 290 static const struct of_device_id exynos_dp_match[] = {
 291         { .compatible = "samsung,exynos5-dp" },
 292         {},
 293 };
 294 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 295 
 296 struct platform_driver dp_driver = {
 297         .probe          = exynos_dp_probe,
 298         .remove         = exynos_dp_remove,
 299         .driver         = {
 300                 .name   = "exynos-dp",
 301                 .owner  = THIS_MODULE,
 302                 .pm     = &exynos_dp_pm_ops,
 303                 .of_match_table = exynos_dp_match,
 304         },
 305 };
 306 
 307 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 308 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 309 MODULE_LICENSE("GPL v2");

/* [<][>][^][v][top][bottom][index][help] */