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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_crtc.h>
23#include <drm/drm_of.h>
24#include <drm/drm_panel.h>
25#include <drm/drm_print.h>
26#include <drm/drm_probe_helper.h>
27#include <drm/exynos_drm.h>
28
29#include "exynos_drm_crtc.h"
30
31#define to_dp(nm) container_of(nm, struct exynos_dp_device, nm)
32
33struct exynos_dp_device {
34 struct drm_encoder encoder;
35 struct drm_connector *connector;
36 struct drm_bridge *ptn_bridge;
37 struct drm_device *drm_dev;
38 struct device *dev;
39
40 struct videomode vm;
41 struct analogix_dp_device *adp;
42 struct analogix_dp_plat_data plat_data;
43};
44
45static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
46 bool enable)
47{
48 struct exynos_dp_device *dp = to_dp(plat_data);
49 struct drm_encoder *encoder = &dp->encoder;
50
51 if (!encoder->crtc)
52 return -EPERM;
53
54 exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);
55
56 return 0;
57}
58
59static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
60{
61 return exynos_dp_crtc_clock_enable(plat_data, true);
62}
63
64static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
65{
66 return exynos_dp_crtc_clock_enable(plat_data, false);
67}
68
69static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
70 struct drm_connector *connector)
71{
72 struct exynos_dp_device *dp = to_dp(plat_data);
73 struct drm_display_mode *mode;
74 int num_modes = 0;
75
76 if (dp->plat_data.panel)
77 return num_modes;
78
79 mode = drm_mode_create(connector->dev);
80 if (!mode) {
81 DRM_DEV_ERROR(dp->dev,
82 "failed to create a new display mode.\n");
83 return num_modes;
84 }
85
86 drm_display_mode_from_videomode(&dp->vm, mode);
87 connector->display_info.width_mm = mode->width_mm;
88 connector->display_info.height_mm = mode->height_mm;
89
90 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
91 drm_mode_set_name(mode);
92 drm_mode_probed_add(connector, mode);
93
94 return num_modes + 1;
95}
96
97static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
98 struct drm_bridge *bridge,
99 struct drm_connector *connector)
100{
101 struct exynos_dp_device *dp = to_dp(plat_data);
102 int ret;
103
104 dp->connector = connector;
105
106 /* Pre-empt DP connector creation if there's a bridge */
107 if (dp->ptn_bridge) {
108 ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge);
109 if (ret) {
110 DRM_DEV_ERROR(dp->dev,
111 "Failed to attach bridge to drm\n");
112 bridge->next = NULL;
113 return ret;
114 }
115 }
116
117 return 0;
118}
119
120static 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
126static void exynos_dp_nop(struct drm_encoder *encoder)
127{
128 /* do nothing */
129}
130
131static 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
137static const struct drm_encoder_funcs exynos_dp_encoder_funcs = {
138 .destroy = drm_encoder_cleanup,
139};
140
141static 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_DEV_ERROR(dp->dev,
148 "failed: of_get_videomode() : %d\n", ret);
149 return ret;
150 }
151 return 0;
152}
153
154static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
155{
156 struct exynos_dp_device *dp = dev_get_drvdata(dev);
157 struct drm_encoder *encoder = &dp->encoder;
158 struct drm_device *drm_dev = data;
159 int ret;
160
161 dp->dev = dev;
162 dp->drm_dev = drm_dev;
163
164 dp->plat_data.dev_type = EXYNOS_DP;
165 dp->plat_data.power_on_start = exynos_dp_poweron;
166 dp->plat_data.power_off = exynos_dp_poweroff;
167 dp->plat_data.attach = exynos_dp_bridge_attach;
168 dp->plat_data.get_modes = exynos_dp_get_modes;
169
170 if (!dp->plat_data.panel && !dp->ptn_bridge) {
171 ret = exynos_dp_dt_parse_panel(dp);
172 if (ret)
173 return ret;
174 }
175
176 drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs,
177 DRM_MODE_ENCODER_TMDS, NULL);
178
179 drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
180
181 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
182 if (ret < 0)
183 return ret;
184
185 dp->plat_data.encoder = encoder;
186
187 dp->adp = analogix_dp_bind(dev, dp->drm_dev, &dp->plat_data);
188 if (IS_ERR(dp->adp)) {
189 dp->encoder.funcs->destroy(&dp->encoder);
190 return PTR_ERR(dp->adp);
191 }
192
193 return 0;
194}
195
196static void exynos_dp_unbind(struct device *dev, struct device *master,
197 void *data)
198{
199 struct exynos_dp_device *dp = dev_get_drvdata(dev);
200
201 analogix_dp_unbind(dp->adp);
202 dp->encoder.funcs->destroy(&dp->encoder);
203}
204
205static const struct component_ops exynos_dp_ops = {
206 .bind = exynos_dp_bind,
207 .unbind = exynos_dp_unbind,
208};
209
210static int exynos_dp_probe(struct platform_device *pdev)
211{
212 struct device *dev = &pdev->dev;
213 struct device_node *np;
214 struct exynos_dp_device *dp;
215 struct drm_panel *panel;
216 struct drm_bridge *bridge;
217 int ret;
218
219 dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
220 GFP_KERNEL);
221 if (!dp)
222 return -ENOMEM;
223
224 /*
225 * We just use the drvdata until driver run into component
226 * add function, and then we would set drvdata to null, so
227 * that analogix dp driver would take charge of the drvdata.
228 */
229 platform_set_drvdata(pdev, dp);
230
231 /* This is for the backward compatibility. */
232 np = of_parse_phandle(dev->of_node, "panel", 0);
233 if (np) {
234 dp->plat_data.panel = of_drm_find_panel(np);
235
236 of_node_put(np);
237 if (IS_ERR(dp->plat_data.panel))
238 return PTR_ERR(dp->plat_data.panel);
239
240 goto out;
241 }
242
243 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
244 if (ret)
245 return ret;
246
247 /* The remote port can be either a panel or a bridge */
248 dp->plat_data.panel = panel;
249 dp->plat_data.skip_connector = !!bridge;
250 dp->ptn_bridge = bridge;
251
252out:
253 return component_add(&pdev->dev, &exynos_dp_ops);
254}
255
256static int exynos_dp_remove(struct platform_device *pdev)
257{
258 component_del(&pdev->dev, &exynos_dp_ops);
259
260 return 0;
261}
262
263#ifdef CONFIG_PM
264static int exynos_dp_suspend(struct device *dev)
265{
266 struct exynos_dp_device *dp = dev_get_drvdata(dev);
267
268 return analogix_dp_suspend(dp->adp);
269}
270
271static int exynos_dp_resume(struct device *dev)
272{
273 struct exynos_dp_device *dp = dev_get_drvdata(dev);
274
275 return analogix_dp_resume(dp->adp);
276}
277#endif
278
279static const struct dev_pm_ops exynos_dp_pm_ops = {
280 SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
281 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
282 pm_runtime_force_resume)
283};
284
285static const struct of_device_id exynos_dp_match[] = {
286 { .compatible = "samsung,exynos5-dp" },
287 {},
288};
289MODULE_DEVICE_TABLE(of, exynos_dp_match);
290
291struct platform_driver dp_driver = {
292 .probe = exynos_dp_probe,
293 .remove = exynos_dp_remove,
294 .driver = {
295 .name = "exynos-dp",
296 .owner = THIS_MODULE,
297 .pm = &exynos_dp_pm_ops,
298 .of_match_table = exynos_dp_match,
299 },
300};
301
302MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
303MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
304MODULE_LICENSE("GPL v2");