xref: /openbmc/linux/drivers/gpu/drm/exynos/exynos_dp.c (revision 208fde6d)
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.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 
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_device *adp;
45 	struct analogix_dp_plat_data plat_data;
46 };
47 
exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data * plat_data,bool enable)48 static 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 
exynos_dp_poweron(struct analogix_dp_plat_data * plat_data)62 static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
63 {
64 	return exynos_dp_crtc_clock_enable(plat_data, true);
65 }
66 
exynos_dp_poweroff(struct analogix_dp_plat_data * plat_data)67 static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
68 {
69 	return exynos_dp_crtc_clock_enable(plat_data, false);
70 }
71 
exynos_dp_get_modes(struct analogix_dp_plat_data * plat_data,struct drm_connector * connector)72 static 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 	int num_modes = 0;
78 
79 	if (dp->plat_data.panel)
80 		return num_modes;
81 
82 	mode = drm_mode_create(connector->dev);
83 	if (!mode) {
84 		DRM_DEV_ERROR(dp->dev,
85 			      "failed to create a new display mode.\n");
86 		return num_modes;
87 	}
88 
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;
92 
93 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
94 	drm_mode_set_name(mode);
95 	drm_mode_probed_add(connector, mode);
96 
97 	return num_modes + 1;
98 }
99 
exynos_dp_bridge_attach(struct analogix_dp_plat_data * plat_data,struct drm_bridge * bridge,struct drm_connector * connector)100 static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
101 				   struct drm_bridge *bridge,
102 				   struct drm_connector *connector)
103 {
104 	struct exynos_dp_device *dp = to_dp(plat_data);
105 	int ret;
106 
107 	dp->connector = connector;
108 
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,
112 					0);
113 		if (ret)
114 			return ret;
115 	}
116 
117 	return 0;
118 }
119 
exynos_dp_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)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 
exynos_dp_nop(struct drm_encoder * encoder)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 
exynos_dp_dt_parse_panel(struct exynos_dp_device * dp)137 static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
138 {
139 	int ret;
140 
141 	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
142 	if (ret) {
143 		DRM_DEV_ERROR(dp->dev,
144 			      "failed: of_get_videomode() : %d\n", ret);
145 		return ret;
146 	}
147 	return 0;
148 }
149 
exynos_dp_bind(struct device * dev,struct device * master,void * data)150 static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
151 {
152 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
153 	struct drm_encoder *encoder = &dp->encoder;
154 	struct drm_device *drm_dev = data;
155 	int ret;
156 
157 	dp->drm_dev = drm_dev;
158 
159 	if (!dp->plat_data.panel && !dp->ptn_bridge) {
160 		ret = exynos_dp_dt_parse_panel(dp);
161 		if (ret)
162 			return ret;
163 	}
164 
165 	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
166 
167 	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
168 
169 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
170 	if (ret < 0)
171 		return ret;
172 
173 	dp->plat_data.encoder = encoder;
174 
175 	ret = analogix_dp_bind(dp->adp, dp->drm_dev);
176 	if (ret)
177 		dp->encoder.funcs->destroy(&dp->encoder);
178 
179 	return ret;
180 }
181 
exynos_dp_unbind(struct device * dev,struct device * master,void * data)182 static void exynos_dp_unbind(struct device *dev, struct device *master,
183 			     void *data)
184 {
185 	struct exynos_dp_device *dp = dev_get_drvdata(dev);
186 
187 	analogix_dp_unbind(dp->adp);
188 	dp->encoder.funcs->destroy(&dp->encoder);
189 }
190 
191 static const struct component_ops exynos_dp_ops = {
192 	.bind	= exynos_dp_bind,
193 	.unbind	= exynos_dp_unbind,
194 };
195 
exynos_dp_probe(struct platform_device * pdev)196 static int exynos_dp_probe(struct platform_device *pdev)
197 {
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;
203 	int ret;
204 
205 	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
206 			  GFP_KERNEL);
207 	if (!dp)
208 		return -ENOMEM;
209 
210 	dp->dev = dev;
211 	/*
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.
215 	 */
216 	platform_set_drvdata(pdev, dp);
217 
218 	/* This is for the backward compatibility. */
219 	np = of_parse_phandle(dev->of_node, "panel", 0);
220 	if (np) {
221 		dp->plat_data.panel = of_drm_find_panel(np);
222 
223 		of_node_put(np);
224 		if (IS_ERR(dp->plat_data.panel))
225 			return PTR_ERR(dp->plat_data.panel);
226 
227 		goto out;
228 	}
229 
230 	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
231 	if (ret)
232 		return ret;
233 
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;
242 
243 	dp->ptn_bridge = bridge;
244 
245 out:
246 	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
247 	if (IS_ERR(dp->adp))
248 		return PTR_ERR(dp->adp);
249 
250 	return component_add(&pdev->dev, &exynos_dp_ops);
251 }
252 
exynos_dp_remove(struct platform_device * pdev)253 static int exynos_dp_remove(struct platform_device *pdev)
254 {
255 	struct exynos_dp_device *dp = platform_get_drvdata(pdev);
256 
257 	component_del(&pdev->dev, &exynos_dp_ops);
258 	analogix_dp_remove(dp->adp);
259 
260 	return 0;
261 }
262 
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 
277 static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,
278 				 exynos_dp_resume, NULL);
279 
280 static const struct of_device_id exynos_dp_match[] = {
281 	{ .compatible = "samsung,exynos5-dp" },
282 	{},
283 };
284 MODULE_DEVICE_TABLE(of, exynos_dp_match);
285 
286 struct platform_driver dp_driver = {
287 	.probe		= exynos_dp_probe,
288 	.remove		= exynos_dp_remove,
289 	.driver		= {
290 		.name	= "exynos-dp",
291 		.pm	= pm_ptr(&exynos_dp_pm_ops),
292 		.of_match_table = exynos_dp_match,
293 	},
294 };
295 
296 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
297 MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
298 MODULE_LICENSE("GPL v2");
299