linux/drivers/gpu/drm/exynos/exynos_dp.c
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   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
  35struct 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
  47static 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
  61static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
  62{
  63        return exynos_dp_crtc_clock_enable(plat_data, true);
  64}
  65
  66static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
  67{
  68        return exynos_dp_crtc_clock_enable(plat_data, false);
  69}
  70
  71static 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
  99static 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
 122static 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
 128static void exynos_dp_nop(struct drm_encoder *encoder)
 129{
 130        /* do nothing */
 131}
 132
 133static 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
 139static 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
 152static 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
 184static 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
 193static const struct component_ops exynos_dp_ops = {
 194        .bind   = exynos_dp_bind,
 195        .unbind = exynos_dp_unbind,
 196};
 197
 198static 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
 247out:
 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
 255static 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
 266static 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
 273static 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
 281static 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
 287static const struct of_device_id exynos_dp_match[] = {
 288        { .compatible = "samsung,exynos5-dp" },
 289        {},
 290};
 291MODULE_DEVICE_TABLE(of, exynos_dp_match);
 292
 293struct 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
 304MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 305MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
 306MODULE_LICENSE("GPL v2");
 307