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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Samsung SoC DP (Display Port) interface driver.
0004  *
0005  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
0006  * Author: Jingoo Han <jg1.han@samsung.com>
0007  */
0008 
0009 #include <linux/clk.h>
0010 #include <linux/component.h>
0011 #include <linux/err.h>
0012 #include <linux/module.h>
0013 #include <linux/of.h>
0014 #include <linux/of_graph.h>
0015 #include <linux/platform_device.h>
0016 #include <linux/pm_runtime.h>
0017 #include <video/of_display_timing.h>
0018 #include <video/of_videomode.h>
0019 #include <video/videomode.h>
0020 
0021 #include <drm/bridge/analogix_dp.h>
0022 #include <drm/drm_atomic_helper.h>
0023 #include <drm/drm_bridge.h>
0024 #include <drm/drm_crtc.h>
0025 #include <drm/drm_of.h>
0026 #include <drm/drm_panel.h>
0027 #include <drm/drm_print.h>
0028 #include <drm/drm_probe_helper.h>
0029 #include <drm/drm_simple_kms_helper.h>
0030 #include <drm/exynos_drm.h>
0031 
0032 #include "exynos_drm_crtc.h"
0033 
0034 #define to_dp(nm)   container_of(nm, struct exynos_dp_device, nm)
0035 
0036 struct exynos_dp_device {
0037     struct drm_encoder         encoder;
0038     struct drm_connector       *connector;
0039     struct drm_bridge          *ptn_bridge;
0040     struct drm_device          *drm_dev;
0041     struct device              *dev;
0042 
0043     struct videomode           vm;
0044     struct analogix_dp_device *adp;
0045     struct analogix_dp_plat_data plat_data;
0046 };
0047 
0048 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
0049                 bool enable)
0050 {
0051     struct exynos_dp_device *dp = to_dp(plat_data);
0052     struct drm_encoder *encoder = &dp->encoder;
0053 
0054     if (!encoder->crtc)
0055         return -EPERM;
0056 
0057     exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
0058 
0059     return 0;
0060 }
0061 
0062 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
0063 {
0064     return exynos_dp_crtc_clock_enable(plat_data, true);
0065 }
0066 
0067 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
0068 {
0069     return exynos_dp_crtc_clock_enable(plat_data, false);
0070 }
0071 
0072 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
0073                    struct drm_connector *connector)
0074 {
0075     struct exynos_dp_device *dp = to_dp(plat_data);
0076     struct drm_display_mode *mode;
0077     int num_modes = 0;
0078 
0079     if (dp->plat_data.panel)
0080         return num_modes;
0081 
0082     mode = drm_mode_create(connector->dev);
0083     if (!mode) {
0084         DRM_DEV_ERROR(dp->dev,
0085                   "failed to create a new display mode.\n");
0086         return num_modes;
0087     }
0088 
0089     drm_display_mode_from_videomode(&dp->vm, mode);
0090     connector->display_info.width_mm = mode->width_mm;
0091     connector->display_info.height_mm = mode->height_mm;
0092 
0093     mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
0094     drm_mode_set_name(mode);
0095     drm_mode_probed_add(connector, mode);
0096 
0097     return num_modes + 1;
0098 }
0099 
0100 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
0101                    struct drm_bridge *bridge,
0102                    struct drm_connector *connector)
0103 {
0104     struct exynos_dp_device *dp = to_dp(plat_data);
0105     int ret;
0106 
0107     dp->connector = connector;
0108 
0109     /* Pre-empt DP connector creation if there's a bridge */
0110     if (dp->ptn_bridge) {
0111         ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
0112                     0);
0113         if (ret)
0114             return ret;
0115     }
0116 
0117     return 0;
0118 }
0119 
0120 static void exynos_dp_mode_set(struct drm_encoder *encoder,
0121                    struct drm_display_mode *mode,
0122                    struct drm_display_mode *adjusted_mode)
0123 {
0124 }
0125 
0126 static void exynos_dp_nop(struct drm_encoder *encoder)
0127 {
0128     /* do nothing */
0129 }
0130 
0131 static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
0132     .mode_set = exynos_dp_mode_set,
0133     .enable = exynos_dp_nop,
0134     .disable = exynos_dp_nop,
0135 };
0136 
0137 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
0138 {
0139     int ret;
0140 
0141     ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
0142     if (ret) {
0143         DRM_DEV_ERROR(dp->dev,
0144                   "failed: of_get_videomode() : %d\n", ret);
0145         return ret;
0146     }
0147     return 0;
0148 }
0149 
0150 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
0151 {
0152     struct exynos_dp_device *dp = dev_get_drvdata(dev);
0153     struct drm_encoder *encoder = &dp->encoder;
0154     struct drm_device *drm_dev = data;
0155     int ret;
0156 
0157     dp->drm_dev = drm_dev;
0158 
0159     if (!dp->plat_data.panel && !dp->ptn_bridge) {
0160         ret = exynos_dp_dt_parse_panel(dp);
0161         if (ret)
0162             return ret;
0163     }
0164 
0165     drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
0166 
0167     drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
0168 
0169     ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
0170     if (ret < 0)
0171         return ret;
0172 
0173     dp->plat_data.encoder = encoder;
0174 
0175     ret = analogix_dp_bind(dp->adp, dp->drm_dev);
0176     if (ret)
0177         dp->encoder.funcs->destroy(&dp->encoder);
0178 
0179     return ret;
0180 }
0181 
0182 static void exynos_dp_unbind(struct device *dev, struct device *master,
0183                  void *data)
0184 {
0185     struct exynos_dp_device *dp = dev_get_drvdata(dev);
0186 
0187     analogix_dp_unbind(dp->adp);
0188     dp->encoder.funcs->destroy(&dp->encoder);
0189 }
0190 
0191 static const struct component_ops exynos_dp_ops = {
0192     .bind   = exynos_dp_bind,
0193     .unbind = exynos_dp_unbind,
0194 };
0195 
0196 static int exynos_dp_probe(struct platform_device *pdev)
0197 {
0198     struct device *dev = &pdev->dev;
0199     struct device_node *np;
0200     struct exynos_dp_device *dp;
0201     struct drm_panel *panel;
0202     struct drm_bridge *bridge;
0203     int ret;
0204 
0205     dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
0206               GFP_KERNEL);
0207     if (!dp)
0208         return -ENOMEM;
0209 
0210     dp->dev = dev;
0211     /*
0212      * We just use the drvdata until driver run into component
0213      * add function, and then we would set drvdata to null, so
0214      * that analogix dp driver would take charge of the drvdata.
0215      */
0216     platform_set_drvdata(pdev, dp);
0217 
0218     /* This is for the backward compatibility. */
0219     np = of_parse_phandle(dev->of_node, "panel", 0);
0220     if (np) {
0221         dp->plat_data.panel = of_drm_find_panel(np);
0222 
0223         of_node_put(np);
0224         if (IS_ERR(dp->plat_data.panel))
0225             return PTR_ERR(dp->plat_data.panel);
0226 
0227         goto out;
0228     }
0229 
0230     ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
0231     if (ret)
0232         return ret;
0233 
0234     /* The remote port can be either a panel or a bridge */
0235     dp->plat_data.panel = panel;
0236     dp->plat_data.dev_type = EXYNOS_DP;
0237     dp->plat_data.power_on_start = exynos_dp_poweron;
0238     dp->plat_data.power_off = exynos_dp_poweroff;
0239     dp->plat_data.attach = exynos_dp_bridge_attach;
0240     dp->plat_data.get_modes = exynos_dp_get_modes;
0241     dp->plat_data.skip_connector = !!bridge;
0242 
0243     dp->ptn_bridge = bridge;
0244 
0245 out:
0246     dp->adp = analogix_dp_probe(dev, &dp->plat_data);
0247     if (IS_ERR(dp->adp))
0248         return PTR_ERR(dp->adp);
0249 
0250     return component_add(&pdev->dev, &exynos_dp_ops);
0251 }
0252 
0253 static int exynos_dp_remove(struct platform_device *pdev)
0254 {
0255     struct exynos_dp_device *dp = platform_get_drvdata(pdev);
0256 
0257     component_del(&pdev->dev, &exynos_dp_ops);
0258     analogix_dp_remove(dp->adp);
0259 
0260     return 0;
0261 }
0262 
0263 #ifdef CONFIG_PM
0264 static int exynos_dp_suspend(struct device *dev)
0265 {
0266     struct exynos_dp_device *dp = dev_get_drvdata(dev);
0267 
0268     return analogix_dp_suspend(dp->adp);
0269 }
0270 
0271 static int exynos_dp_resume(struct device *dev)
0272 {
0273     struct exynos_dp_device *dp = dev_get_drvdata(dev);
0274 
0275     return analogix_dp_resume(dp->adp);
0276 }
0277 #endif
0278 
0279 static const struct dev_pm_ops exynos_dp_pm_ops = {
0280     SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
0281     SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
0282                 pm_runtime_force_resume)
0283 };
0284 
0285 static const struct of_device_id exynos_dp_match[] = {
0286     { .compatible = "samsung,exynos5-dp" },
0287     {},
0288 };
0289 MODULE_DEVICE_TABLE(of, exynos_dp_match);
0290 
0291 struct platform_driver dp_driver = {
0292     .probe      = exynos_dp_probe,
0293     .remove     = exynos_dp_remove,
0294     .driver     = {
0295         .name   = "exynos-dp",
0296         .owner  = THIS_MODULE,
0297         .pm = &exynos_dp_pm_ops,
0298         .of_match_table = exynos_dp_match,
0299     },
0300 };
0301 
0302 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
0303 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
0304 MODULE_LICENSE("GPL v2");
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