1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Samsung SoC DP (Display Port) interface driver.
5 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
10 #include <linux/component.h>
11 #include <linux/err.h>
12 #include <linux/module.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>
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>
32 #include "exynos_drm_crtc.h"
34 #define to_dp(nm) container_of(nm, struct exynos_dp_device, nm)
36 struct 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;
44 struct analogix_dp_device *adp;
45 struct analogix_dp_plat_data plat_data;
48 static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
51 struct exynos_dp_device *dp = to_dp(plat_data);
52 struct drm_encoder *encoder = &dp->encoder;
57 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
62 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
64 return exynos_dp_crtc_clock_enable(plat_data, true);
67 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
69 return exynos_dp_crtc_clock_enable(plat_data, false);
72 static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
73 struct drm_connector *connector)
75 struct exynos_dp_device *dp = to_dp(plat_data);
76 struct drm_display_mode *mode;
79 if (dp->plat_data.panel)
82 mode = drm_mode_create(connector->dev);
84 DRM_DEV_ERROR(dp->dev,
85 "failed to create a new display mode.\n");
89 drm_display_mode_from_videomode(&dp->vm, mode);
90 connector->display_info.width_mm = mode->width_mm;
91 connector->display_info.height_mm = mode->height_mm;
93 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
94 drm_mode_set_name(mode);
95 drm_mode_probed_add(connector, mode);
100 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
101 struct drm_bridge *bridge,
102 struct drm_connector *connector)
104 struct exynos_dp_device *dp = to_dp(plat_data);
107 dp->connector = connector;
109 /* Pre-empt DP connector creation if there's a bridge */
110 if (dp->ptn_bridge) {
111 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
120 static void exynos_dp_mode_set(struct drm_encoder *encoder,
121 struct drm_display_mode *mode,
122 struct drm_display_mode *adjusted_mode)
126 static void exynos_dp_nop(struct drm_encoder *encoder)
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,
137 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
141 ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
143 DRM_DEV_ERROR(dp->dev,
144 "failed: of_get_videomode() : %d\n", ret);
150 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
152 struct exynos_dp_device *dp = dev_get_drvdata(dev);
153 struct drm_encoder *encoder = &dp->encoder;
154 struct drm_device *drm_dev = data;
157 dp->drm_dev = drm_dev;
159 if (!dp->plat_data.panel && !dp->ptn_bridge) {
160 ret = exynos_dp_dt_parse_panel(dp);
165 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
167 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
169 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
173 dp->plat_data.encoder = encoder;
175 ret = analogix_dp_bind(dp->adp, dp->drm_dev);
177 dp->encoder.funcs->destroy(&dp->encoder);
182 static void exynos_dp_unbind(struct device *dev, struct device *master,
185 struct exynos_dp_device *dp = dev_get_drvdata(dev);
187 analogix_dp_unbind(dp->adp);
188 dp->encoder.funcs->destroy(&dp->encoder);
191 static const struct component_ops exynos_dp_ops = {
192 .bind = exynos_dp_bind,
193 .unbind = exynos_dp_unbind,
196 static int exynos_dp_probe(struct platform_device *pdev)
198 struct device *dev = &pdev->dev;
199 struct device_node *np;
200 struct exynos_dp_device *dp;
201 struct drm_panel *panel;
202 struct drm_bridge *bridge;
205 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
212 * We just use the drvdata until driver run into component
213 * add function, and then we would set drvdata to null, so
214 * that analogix dp driver would take charge of the drvdata.
216 platform_set_drvdata(pdev, dp);
218 /* This is for the backward compatibility. */
219 np = of_parse_phandle(dev->of_node, "panel", 0);
221 dp->plat_data.panel = of_drm_find_panel(np);
224 if (IS_ERR(dp->plat_data.panel))
225 return PTR_ERR(dp->plat_data.panel);
230 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
234 /* The remote port can be either a panel or a bridge */
235 dp->plat_data.panel = panel;
236 dp->plat_data.dev_type = EXYNOS_DP;
237 dp->plat_data.power_on_start = exynos_dp_poweron;
238 dp->plat_data.power_off = exynos_dp_poweroff;
239 dp->plat_data.attach = exynos_dp_bridge_attach;
240 dp->plat_data.get_modes = exynos_dp_get_modes;
241 dp->plat_data.skip_connector = !!bridge;
243 dp->ptn_bridge = bridge;
246 dp->adp = analogix_dp_probe(dev, &dp->plat_data);
248 return PTR_ERR(dp->adp);
250 return component_add(&pdev->dev, &exynos_dp_ops);
253 static void exynos_dp_remove(struct platform_device *pdev)
255 struct exynos_dp_device *dp = platform_get_drvdata(pdev);
257 component_del(&pdev->dev, &exynos_dp_ops);
258 analogix_dp_remove(dp->adp);
261 static int exynos_dp_suspend(struct device *dev)
263 struct exynos_dp_device *dp = dev_get_drvdata(dev);
265 return analogix_dp_suspend(dp->adp);
268 static int exynos_dp_resume(struct device *dev)
270 struct exynos_dp_device *dp = dev_get_drvdata(dev);
272 return analogix_dp_resume(dp->adp);
275 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,
276 exynos_dp_resume, NULL);
278 static const struct of_device_id exynos_dp_match[] = {
279 { .compatible = "samsung,exynos5-dp" },
282 MODULE_DEVICE_TABLE(of, exynos_dp_match);
284 struct platform_driver dp_driver = {
285 .probe = exynos_dp_probe,
286 .remove_new = exynos_dp_remove,
289 .owner = THIS_MODULE,
290 .pm = pm_ptr(&exynos_dp_pm_ops),
291 .of_match_table = exynos_dp_match,
296 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
297 MODULE_LICENSE("GPL v2");