xref: /openbmc/linux/drivers/gpu/drm/exynos/exynos_dp.c (revision 68198dca)
1 /*
2  * Samsung SoC DP (Display Port) interface driver.
3  *
4  * Copyright (C) 2012 Samsung Electronics Co., Ltd.
5  * Author: Jingoo Han <jg1.han@samsung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the
9  * Free Software Foundation; either version 2 of the License, or (at your
10  * option) any later version.
11  */
12 
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/err.h>
16 #include <linux/clk.h>
17 #include <linux/of_graph.h>
18 #include <linux/component.h>
19 #include <video/of_display_timing.h>
20 #include <video/of_videomode.h>
21 #include <video/videomode.h>
22 
23 #include <drm/drmP.h>
24 #include <drm/drm_crtc.h>
25 #include <drm/drm_crtc_helper.h>
26 #include <drm/drm_of.h>
27 #include <drm/drm_panel.h>
28 
29 #include <drm/bridge/analogix_dp.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 
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;
41 	struct device              *dev;
42 
43 	struct videomode           vm;
44 	struct analogix_dp_plat_data plat_data;
45 };
46 
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 
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 
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 
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_ERROR("failed to create a new display mode.\n");
84 		return num_modes;
85 	}
86 
87 	drm_display_mode_from_videomode(&dp->vm, mode);
88 	connector->display_info.width_mm = mode->width_mm;
89 	connector->display_info.height_mm = mode->height_mm;
90 
91 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
92 	drm_mode_set_name(mode);
93 	drm_mode_probed_add(connector, mode);
94 
95 	return num_modes + 1;
96 }
97 
98 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
99 				   struct drm_bridge *bridge,
100 				   struct drm_connector *connector)
101 {
102 	struct exynos_dp_device *dp = to_dp(plat_data);
103 	int ret;
104 
105 	dp->connector = connector;
106 
107 	/* Pre-empt DP connector creation if there's a bridge */
108 	if (dp->ptn_bridge) {
109 		ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge);
110 		if (ret) {
111 			DRM_ERROR("Failed to attach bridge to drm\n");
112 			bridge->next = NULL;
113 			return ret;
114 		}
115 	}
116 
117 	return 0;
118 }
119 
120 static void exynos_dp_mode_set(struct drm_encoder *encoder,
121 			       struct drm_display_mode *mode,
122 			       struct drm_display_mode *adjusted_mode)
123 {
124 }
125 
126 static void exynos_dp_nop(struct drm_encoder *encoder)
127 {
128 	/* do nothing */
129 }
130 
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,
135 };
136 
137 static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
138 	.destroy = drm_encoder_cleanup,
139 };
140 
141 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
142 {
143 	int ret;
144 
145 	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
146 	if (ret) {
147 		DRM_ERROR("failed: of_get_videomode() : %d\n", ret);
148 		return ret;
149 	}
150 	return 0;
151 }
152 
153 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
154 {
155 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
156 	struct drm_encoder *encoder = &dp->encoder;
157 	struct drm_device *drm_dev = data;
158 	int ret;
159 
160 	/*
161 	 * Just like the probe function said, we don't need the
162 	 * device drvrate anymore, we should leave the charge to
163 	 * analogix dp driver, set the device drvdata to NULL.
164 	 */
165 	dev_set_drvdata(dev, NULL);
166 
167 	dp->dev = dev;
168 	dp->drm_dev = drm_dev;
169 
170 	dp->plat_data.dev_type = EXYNOS_DP;
171 	dp->plat_data.power_on = exynos_dp_poweron;
172 	dp->plat_data.power_off = exynos_dp_poweroff;
173 	dp->plat_data.attach = exynos_dp_bridge_attach;
174 	dp->plat_data.get_modes = exynos_dp_get_modes;
175 
176 	if (!dp->plat_data.panel && !dp->ptn_bridge) {
177 		ret = exynos_dp_dt_parse_panel(dp);
178 		if (ret)
179 			return ret;
180 	}
181 
182 	drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
183 			 DRM_MODE_ENCODER_TMDS, NULL);
184 
185 	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
186 
187 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
188 	if (ret < 0)
189 		return ret;
190 
191 	dp->plat_data.encoder = encoder;
192 
193 	return analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
194 }
195 
196 static void exynos_dp_unbind(struct device *dev, struct device *master,
197 			     void *data)
198 {
199 	return analogix_dp_unbind(dev, master, data);
200 }
201 
202 static const struct component_ops exynos_dp_ops = {
203 	.bind	= exynos_dp_bind,
204 	.unbind	= exynos_dp_unbind,
205 };
206 
207 static int exynos_dp_probe(struct platform_device *pdev)
208 {
209 	struct device *dev = &pdev->dev;
210 	struct device_node *np;
211 	struct exynos_dp_device *dp;
212 	struct drm_panel *panel;
213 	struct drm_bridge *bridge;
214 	int ret;
215 
216 	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
217 			  GFP_KERNEL);
218 	if (!dp)
219 		return -ENOMEM;
220 
221 	/*
222 	 * We just use the drvdata until driver run into component
223 	 * add function, and then we would set drvdata to null, so
224 	 * that analogix dp driver would take charge of the drvdata.
225 	 */
226 	platform_set_drvdata(pdev, dp);
227 
228 	/* This is for the backward compatibility. */
229 	np = of_parse_phandle(dev->of_node, "panel", 0);
230 	if (np) {
231 		dp->plat_data.panel = of_drm_find_panel(np);
232 		of_node_put(np);
233 		if (!dp->plat_data.panel)
234 			return -EPROBE_DEFER;
235 		goto out;
236 	}
237 
238 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
239 	if (ret)
240 		return ret;
241 
242 	/* The remote port can be either a panel or a bridge */
243 	dp->plat_data.panel = panel;
244 	dp->ptn_bridge = bridge;
245 
246 out:
247 	return component_add(&pdev->dev, &exynos_dp_ops);
248 }
249 
250 static int exynos_dp_remove(struct platform_device *pdev)
251 {
252 	component_del(&pdev->dev, &exynos_dp_ops);
253 
254 	return 0;
255 }
256 
257 #ifdef CONFIG_PM
258 static int exynos_dp_suspend(struct device *dev)
259 {
260 	return analogix_dp_suspend(dev);
261 }
262 
263 static int exynos_dp_resume(struct device *dev)
264 {
265 	return analogix_dp_resume(dev);
266 }
267 #endif
268 
269 static const struct dev_pm_ops exynos_dp_pm_ops = {
270 	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
271 };
272 
273 static const struct of_device_id exynos_dp_match[] = {
274 	{ .compatible = "samsung,exynos5-dp" },
275 	{},
276 };
277 MODULE_DEVICE_TABLE(of, exynos_dp_match);
278 
279 struct platform_driver dp_driver = {
280 	.probe		= exynos_dp_probe,
281 	.remove		= exynos_dp_remove,
282 	.driver		= {
283 		.name	= "exynos-dp",
284 		.owner	= THIS_MODULE,
285 		.pm	= &exynos_dp_pm_ops,
286 		.of_match_table = exynos_dp_match,
287 	},
288 };
289 
290 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
291 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
292 MODULE_LICENSE("GPL v2");
293