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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.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
36struct 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
48static 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
62static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
63{
64 return exynos_dp_crtc_clock_enable(plat_data, true);
65}
66
67static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
68{
69 return exynos_dp_crtc_clock_enable(plat_data, false);
70}
71
72static 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
100static 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
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 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
150static 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
182static 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
191static const struct component_ops exynos_dp_ops = {
192 .bind = exynos_dp_bind,
193 .unbind = exynos_dp_unbind,
194};
195
196static 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
245out:
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
253static void 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
261static int exynos_dp_suspend(struct device *dev)
262{
263 struct exynos_dp_device *dp = dev_get_drvdata(dev);
264
265 return analogix_dp_suspend(dp->adp);
266}
267
268static int exynos_dp_resume(struct device *dev)
269{
270 struct exynos_dp_device *dp = dev_get_drvdata(dev);
271
272 return analogix_dp_resume(dp->adp);
273}
274
275static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,
276 exynos_dp_resume, NULL);
277
278static const struct of_device_id exynos_dp_match[] = {
279 { .compatible = "samsung,exynos5-dp" },
280 {},
281};
282MODULE_DEVICE_TABLE(of, exynos_dp_match);
283
284struct platform_driver dp_driver = {
285 .probe = exynos_dp_probe,
286 .remove_new = exynos_dp_remove,
287 .driver = {
288 .name = "exynos-dp",
289 .owner = THIS_MODULE,
290 .pm = pm_ptr(&exynos_dp_pm_ops),
291 .of_match_table = exynos_dp_match,
292 },
293};
294
295MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
296MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
297MODULE_LICENSE("GPL v2");