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 
exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data * plat_data,bool enable)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 
exynos_dp_poweron(struct analogix_dp_plat_data * plat_data)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 
exynos_dp_poweroff(struct analogix_dp_plat_data * plat_data)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 
exynos_dp_get_modes(struct analogix_dp_plat_data * plat_data,struct drm_connector * connector)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 
exynos_dp_bridge_attach(struct analogix_dp_plat_data * plat_data,struct drm_bridge * bridge,struct drm_connector * connector)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 			return ret;
114 	}
115 
116 	return 0;
117 }
118 
exynos_dp_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)119 static 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 
exynos_dp_nop(struct drm_encoder * encoder)125 static void exynos_dp_nop(struct drm_encoder *encoder)
126 {
127 	/* do nothing */
128 }
129 
130 static 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 
exynos_dp_dt_parse_panel(struct exynos_dp_device * dp)136 static 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 
exynos_dp_bind(struct device * dev,struct device * master,void * data)149 static 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 
exynos_dp_unbind(struct device * dev,struct device * master,void * data)181 static 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 
190 static const struct component_ops exynos_dp_ops = {
191 	.bind	= exynos_dp_bind,
192 	.unbind	= exynos_dp_unbind,
193 };
194 
exynos_dp_probe(struct platform_device * pdev)195 static 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 component
212 	 * add function, and then we would set drvdata to null, so
213 	 * 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_start = 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 
244 out:
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 
exynos_dp_remove(struct platform_device * pdev)252 static int exynos_dp_remove(struct platform_device *pdev)
253 {
254 	struct exynos_dp_device *dp = platform_get_drvdata(pdev);
255 
256 	component_del(&pdev->dev, &exynos_dp_ops);
257 	analogix_dp_remove(dp->adp);
258 
259 	return 0;
260 }
261 
262 #ifdef CONFIG_PM
exynos_dp_suspend(struct device * dev)263 static int exynos_dp_suspend(struct device *dev)
264 {
265 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
266 
267 	return analogix_dp_suspend(dp->adp);
268 }
269 
exynos_dp_resume(struct device * dev)270 static int exynos_dp_resume(struct device *dev)
271 {
272 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
273 
274 	return analogix_dp_resume(dp->adp);
275 }
276 #endif
277 
278 static const struct dev_pm_ops exynos_dp_pm_ops = {
279 	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
280 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
281 				pm_runtime_force_resume)
282 };
283 
284 static const struct of_device_id exynos_dp_match[] = {
285 	{ .compatible = "samsung,exynos5-dp" },
286 	{},
287 };
288 MODULE_DEVICE_TABLE(of, exynos_dp_match);
289 
290 struct platform_driver dp_driver = {
291 	.probe		= exynos_dp_probe,
292 	.remove		= exynos_dp_remove,
293 	.driver		= {
294 		.name	= "exynos-dp",
295 		.owner	= THIS_MODULE,
296 		.pm	= &exynos_dp_pm_ops,
297 		.of_match_table = exynos_dp_match,
298 	},
299 };
300 
301 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
302 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
303 MODULE_LICENSE("GPL v2");
304