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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
78 if (dp->plat_data.panel)
79 return 0;
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 0;
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 1;
97}
98
99static 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
119static 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
125static void exynos_dp_nop(struct drm_encoder *encoder)
126{
127 /* do nothing */
128}
129
130static 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
136static 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
149static 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
181static 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
190static const struct component_ops exynos_dp_ops = {
191 .bind = exynos_dp_bind,
192 .unbind = exynos_dp_unbind,
193};
194
195static 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 = 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
244out:
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
252static void exynos_dp_remove(struct platform_device *pdev)
253{
254 component_del(&pdev->dev, &exynos_dp_ops);
255}
256
257static int exynos_dp_suspend(struct device *dev)
258{
259 struct exynos_dp_device *dp = dev_get_drvdata(dev);
260
261 return analogix_dp_suspend(dp->adp);
262}
263
264static int exynos_dp_resume(struct device *dev)
265{
266 struct exynos_dp_device *dp = dev_get_drvdata(dev);
267
268 return analogix_dp_resume(dp->adp);
269}
270
271static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,
272 exynos_dp_resume, NULL);
273
274static const struct of_device_id exynos_dp_match[] = {
275 { .compatible = "samsung,exynos5-dp" },
276 {},
277};
278MODULE_DEVICE_TABLE(of, exynos_dp_match);
279
280struct platform_driver dp_driver = {
281 .probe = exynos_dp_probe,
282 .remove = exynos_dp_remove,
283 .driver = {
284 .name = "exynos-dp",
285 .pm = pm_ptr(&exynos_dp_pm_ops),
286 .of_match_table = exynos_dp_match,
287 },
288};
289
290MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
291MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
292MODULE_LICENSE("GPL v2");