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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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.h>14#include <linux/of_graph.h>15#include <linux/platform_device.h>16#include <linux/pm_runtime.h>17#include <video/of_display_timing.h>18#include <video/of_videomode.h>19#include <video/videomode.h>20 21#include <drm/bridge/analogix_dp.h>22#include <drm/drm_atomic_helper.h>23#include <drm/drm_bridge.h>24#include <drm/drm_crtc.h>25#include <drm/drm_of.h>26#include <drm/drm_panel.h>27#include <drm/drm_print.h>28#include <drm/drm_probe_helper.h>29#include <drm/drm_simple_kms_helper.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 36struct 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_device *adp;45 struct analogix_dp_plat_data plat_data;46};47 48static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,49 bool enable)50{51 struct exynos_dp_device *dp = to_dp(plat_data);52 struct drm_encoder *encoder = &dp->encoder;53 54 if (!encoder->crtc)55 return -EPERM;56 57 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);58 59 return 0;60}61 62static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)63{64 return exynos_dp_crtc_clock_enable(plat_data, true);65}66 67static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)68{69 return exynos_dp_crtc_clock_enable(plat_data, false);70}71 72static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,73 struct drm_connector *connector)74{75 struct exynos_dp_device *dp = to_dp(plat_data);76 struct drm_display_mode *mode;77 78 if (dp->plat_data.panel)79 return 0;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 0;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 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 return ret;114 }115 116 return 0;117}118 119static void exynos_dp_mode_set(struct drm_encoder *encoder,120 struct drm_display_mode *mode,121 struct drm_display_mode *adjusted_mode)122{123}124 125static void exynos_dp_nop(struct drm_encoder *encoder)126{127 /* do nothing */128}129 130static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {131 .mode_set = exynos_dp_mode_set,132 .enable = exynos_dp_nop,133 .disable = exynos_dp_nop,134};135 136static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)137{138 int ret;139 140 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);141 if (ret) {142 DRM_DEV_ERROR(dp->dev,143 "failed: of_get_videomode() : %d\n", ret);144 return ret;145 }146 return 0;147}148 149static int exynos_dp_bind(struct device *dev, struct device *master, void *data)150{151 struct exynos_dp_device *dp = dev_get_drvdata(dev);152 struct drm_encoder *encoder = &dp->encoder;153 struct drm_device *drm_dev = data;154 int ret;155 156 dp->drm_dev = drm_dev;157 158 if (!dp->plat_data.panel && !dp->ptn_bridge) {159 ret = exynos_dp_dt_parse_panel(dp);160 if (ret)161 return ret;162 }163 164 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);165 166 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);167 168 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);169 if (ret < 0)170 return ret;171 172 dp->plat_data.encoder = encoder;173 174 ret = analogix_dp_bind(dp->adp, dp->drm_dev);175 if (ret)176 dp->encoder.funcs->destroy(&dp->encoder);177 178 return ret;179}180 181static void exynos_dp_unbind(struct device *dev, struct device *master,182 void *data)183{184 struct exynos_dp_device *dp = dev_get_drvdata(dev);185 186 analogix_dp_unbind(dp->adp);187 dp->encoder.funcs->destroy(&dp->encoder);188}189 190static const struct component_ops exynos_dp_ops = {191 .bind = exynos_dp_bind,192 .unbind = exynos_dp_unbind,193};194 195static int exynos_dp_probe(struct platform_device *pdev)196{197 struct device *dev = &pdev->dev;198 struct device_node *np;199 struct exynos_dp_device *dp;200 struct drm_panel *panel;201 struct drm_bridge *bridge;202 int ret;203 204 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),205 GFP_KERNEL);206 if (!dp)207 return -ENOMEM;208 209 dp->dev = dev;210 /*211 * We just use the drvdata until driver run into component212 * add function, and then we would set drvdata to null, so213 * that analogix dp driver would take charge of the drvdata.214 */215 platform_set_drvdata(pdev, dp);216 217 /* This is for the backward compatibility. */218 np = of_parse_phandle(dev->of_node, "panel", 0);219 if (np) {220 dp->plat_data.panel = of_drm_find_panel(np);221 222 of_node_put(np);223 if (IS_ERR(dp->plat_data.panel))224 return PTR_ERR(dp->plat_data.panel);225 226 goto out;227 }228 229 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);230 if (ret)231 return ret;232 233 /* The remote port can be either a panel or a bridge */234 dp->plat_data.panel = panel;235 dp->plat_data.dev_type = EXYNOS_DP;236 dp->plat_data.power_on = exynos_dp_poweron;237 dp->plat_data.power_off = exynos_dp_poweroff;238 dp->plat_data.attach = exynos_dp_bridge_attach;239 dp->plat_data.get_modes = exynos_dp_get_modes;240 dp->plat_data.skip_connector = !!bridge;241 242 dp->ptn_bridge = bridge;243 244out:245 dp->adp = analogix_dp_probe(dev, &dp->plat_data);246 if (IS_ERR(dp->adp))247 return PTR_ERR(dp->adp);248 249 return component_add(&pdev->dev, &exynos_dp_ops);250}251 252static void exynos_dp_remove(struct platform_device *pdev)253{254 component_del(&pdev->dev, &exynos_dp_ops);255}256 257static int exynos_dp_suspend(struct device *dev)258{259 struct exynos_dp_device *dp = dev_get_drvdata(dev);260 261 return analogix_dp_suspend(dp->adp);262}263 264static int exynos_dp_resume(struct device *dev)265{266 struct exynos_dp_device *dp = dev_get_drvdata(dev);267 268 return analogix_dp_resume(dp->adp);269}270 271static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,272 exynos_dp_resume, NULL);273 274static const struct of_device_id exynos_dp_match[] = {275 { .compatible = "samsung,exynos5-dp" },276 {},277};278MODULE_DEVICE_TABLE(of, exynos_dp_match);279 280struct platform_driver dp_driver = {281 .probe = exynos_dp_probe,282 .remove_new = exynos_dp_remove,283 .driver = {284 .name = "exynos-dp",285 .pm = pm_ptr(&exynos_dp_pm_ops),286 .of_match_table = exynos_dp_match,287 },288};289 290MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");291MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");292MODULE_LICENSE("GPL v2");293