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/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_bridge.h>
  23 #include <drm/drm_crtc.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_panel.h>
  26 #include <drm/drm_print.h>
  27 #include <drm/drm_probe_helper.h>
  28 #include <drm/drm_simple_kms_helper.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_device *adp;
  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_DEV_ERROR(dp->dev,
  84                               "failed to create a new display mode.\n");
  85                 return num_modes;
  86         }
  87
  88         drm_display_mode_from_videomode(&dp->vm, mode);
  89         connector->display_info.width_mm = mode->width_mm;
  90         connector->display_info.height_mm = mode->height_mm;
  91
  92         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
  93         drm_mode_set_name(mode);
  94         drm_mode_probed_add(connector, mode);
  95
  96         return num_modes + 1;
  97 }
  98
  99 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
 100                                    struct drm_bridge *bridge,
 101                                    struct drm_connector *connector)
 102 {
 103         struct exynos_dp_device *dp = to_dp(plat_data);
 104         int ret;
 105
 106         dp->connector = connector;
 107
 108         /* Pre-empt DP connector creation if there's a bridge */
 109         if (dp->ptn_bridge) {
 110                 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
 111                                         0);
 112                 if (ret) {
 113                         DRM_DEV_ERROR(dp->dev,
 114                                       "Failed to attach bridge to drm\n");
 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 int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
 140 {
 141         int ret;
 142
 143         ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
 144         if (ret) {
 145                 DRM_DEV_ERROR(dp->dev,
 146                               "failed: of_get_videomode() : %d\n", ret);
 147                 return ret;
 148         }
 149         return 0;
 150 }
 151
 152 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
 153 {
 154         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 155         struct drm_encoder *encoder = &dp->encoder;
 156         struct drm_device *drm_dev = data;
 157         int ret;
 158
 159         dp->drm_dev = drm_dev;
 160
 161         if (!dp->plat_data.panel && !dp->ptn_bridge) {
 162                 ret = exynos_dp_dt_parse_panel(dp);
 163                 if (ret)
 164                         return ret;
 165         }
 166
 167         drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
 168
 169         drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
 170
 171         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
 172         if (ret < 0)
 173                 return ret;
 174
 175         dp->plat_data.encoder = encoder;
 176
 177         ret = analogix_dp_bind(dp->adp, dp->drm_dev);
 178         if (ret)
 179                 dp->encoder.funcs->destroy(&dp->encoder);
 180
 181         return ret;
 182 }
 183
 184 static void exynos_dp_unbind(struct device *dev, struct device *master,
 185                              void *data)
 186 {
 187         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 188
 189         analogix_dp_unbind(dp->adp);
 190         dp->encoder.funcs->destroy(&dp->encoder);
 191 }
 192
 193 static const struct component_ops exynos_dp_ops = {
 194         .bind   = exynos_dp_bind,
 195         .unbind = exynos_dp_unbind,
 196 };
 197
 198 static int exynos_dp_probe(struct platform_device *pdev)
 199 {
 200         struct device *dev = &pdev->dev;
 201         struct device_node *np;
 202         struct exynos_dp_device *dp;
 203         struct drm_panel *panel;
 204         struct drm_bridge *bridge;
 205         int ret;
 206
 207         dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 208                           GFP_KERNEL);
 209         if (!dp)
 210                 return -ENOMEM;
 211
 212         dp->dev = dev;
 213         /*
 214          * We just use the drvdata until driver run into component
 215          * add function, and then we would set drvdata to null, so
 216          * that analogix dp driver would take charge of the drvdata.
 217          */
 218         platform_set_drvdata(pdev, dp);
 219
 220         /* This is for the backward compatibility. */
 221         np = of_parse_phandle(dev->of_node, "panel", 0);
 222         if (np) {
 223                 dp->plat_data.panel = of_drm_find_panel(np);
 224
 225                 of_node_put(np);
 226                 if (IS_ERR(dp->plat_data.panel))
 227                         return PTR_ERR(dp->plat_data.panel);
 228
 229                 goto out;
 230         }
 231
 232         ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
 233         if (ret)
 234                 return ret;
 235
 236         /* The remote port can be either a panel or a bridge */
 237         dp->plat_data.panel = panel;
 238         dp->plat_data.dev_type = EXYNOS_DP;
 239         dp->plat_data.power_on_start = exynos_dp_poweron;
 240         dp->plat_data.power_off = exynos_dp_poweroff;
 241         dp->plat_data.attach = exynos_dp_bridge_attach;
 242         dp->plat_data.get_modes = exynos_dp_get_modes;
 243         dp->plat_data.skip_connector = !!bridge;
 244
 245         dp->ptn_bridge = bridge;
 246
 247 out:
 248         dp->adp = analogix_dp_probe(dev, &dp->plat_data);
 249         if (IS_ERR(dp->adp))
 250                 return PTR_ERR(dp->adp);
 251
 252         return component_add(&pdev->dev, &exynos_dp_ops);
 253 }
 254
 255 static int exynos_dp_remove(struct platform_device *pdev)
 256 {
 257         struct exynos_dp_device *dp = platform_get_drvdata(pdev);
 258
 259         component_del(&pdev->dev, &exynos_dp_ops);
 260         analogix_dp_remove(dp->adp);
 261
 262         return 0;
 263 }
 264
 265 #ifdef CONFIG_PM
 266 static int exynos_dp_suspend(struct device *dev)
 267 {
 268         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 269
 270         return analogix_dp_suspend(dp->adp);
 271 }
 272
 273 static int exynos_dp_resume(struct device *dev)
 274 {
 275         struct exynos_dp_device *dp = dev_get_drvdata(dev);
 276
 277         return analogix_dp_resume(dp->adp);
 278 }
 279 #endif
 280
 281 static const struct dev_pm_ops exynos_dp_pm_ops = {
 282         SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
 283         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 284                                 pm_runtime_force_resume)
 285 };
 286
 287 static const struct of_device_id exynos_dp_match[] = {
 288         { .compatible = "samsung,exynos5-dp" },
 289         {},
 290 };
 291 MODULE_DEVICE_TABLE(of, exynos_dp_match);
 292
 293 struct platform_driver dp_driver = {
 294         .probe          = exynos_dp_probe,
 295         .remove         = exynos_dp_remove,
 296         .driver         = {
 297                 .name   = "exynos-dp",
 298                 .owner  = THIS_MODULE,
 299                 .pm     = &exynos_dp_pm_ops,
 300                 .of_match_table = exynos_dp_match,
 301         },
 302 };
 303
 304 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 305 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 306 MODULE_LICENSE("GPL v2");