summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_dp.c
blob: 9ac51b6ab34b1dfa302efdc7c94af344fb49f759 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Samsung SoC DP (Display Port) interface driver.
 *
 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

#include <drm/bridge/analogix_dp.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_crtc.h"

#define to_dp(nm)	container_of(nm, struct exynos_dp_device, nm)

struct exynos_dp_device {
	struct drm_encoder         encoder;
	struct drm_connector       *connector;
	struct drm_bridge          *ptn_bridge;
	struct drm_device          *drm_dev;
	struct device              *dev;

	struct videomode           vm;
	struct analogix_dp_device *adp;
	struct analogix_dp_plat_data plat_data;
};

static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
				bool enable)
{
	struct exynos_dp_device *dp = to_dp(plat_data);
	struct drm_encoder *encoder = &dp->encoder;

	if (!encoder->crtc)
		return -EPERM;

	exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);

	return 0;
}

static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
{
	return exynos_dp_crtc_clock_enable(plat_data, true);
}

static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
{
	return exynos_dp_crtc_clock_enable(plat_data, false);
}

static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
			       struct drm_connector *connector)
{
	struct exynos_dp_device *dp = to_dp(plat_data);
	struct drm_display_mode *mode;
	int num_modes = 0;

	if (dp->plat_data.panel)
		return num_modes;

	mode = drm_mode_create(connector->dev);
	if (!mode) {
		DRM_DEV_ERROR(dp->dev,
			      "failed to create a new display mode.\n");
		return num_modes;
	}

	drm_display_mode_from_videomode(&dp->vm, mode);
	connector->display_info.width_mm = mode->width_mm;
	connector->display_info.height_mm = mode->height_mm;

	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
	drm_mode_set_name(mode);
	drm_mode_probed_add(connector, mode);

	return num_modes + 1;
}

static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
				   struct drm_bridge *bridge,
				   struct drm_connector *connector)
{
	struct exynos_dp_device *dp = to_dp(plat_data);
	int ret;

	dp->connector = connector;

	/* Pre-empt DP connector creation if there's a bridge */
	if (dp->ptn_bridge) {
		ret = drm_bridge_attach(&dp->encoder, dp->ptn_bridge, bridge,
					0);
		if (ret) {
			DRM_DEV_ERROR(dp->dev,
				      "Failed to attach bridge to drm\n");
			return ret;
		}
	}

	return 0;
}

static void exynos_dp_mode_set(struct drm_encoder *encoder,
			       struct drm_display_mode *mode,
			       struct drm_display_mode *adjusted_mode)
{
}

static void exynos_dp_nop(struct drm_encoder *encoder)
{
	/* do nothing */
}

static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
	.mode_set = exynos_dp_mode_set,
	.enable = exynos_dp_nop,
	.disable = exynos_dp_nop,
};

static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
{
	int ret;

	ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
	if (ret) {
		DRM_DEV_ERROR(dp->dev,
			      "failed: of_get_videomode() : %d\n", ret);
		return ret;
	}
	return 0;
}

static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
{
	struct exynos_dp_device *dp = dev_get_drvdata(dev);
	struct drm_encoder *encoder = &dp->encoder;
	struct drm_device *drm_dev = data;
	int ret;

	dp->drm_dev = drm_dev;

	if (!dp->plat_data.panel && !dp->ptn_bridge) {
		ret = exynos_dp_dt_parse_panel(dp);
		if (ret)
			return ret;
	}

	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);

	drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);

	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
	if (ret < 0)
		return ret;

	dp->plat_data.encoder = encoder;

	ret = analogix_dp_bind(dp->adp, dp->drm_dev);
	if (ret)
		dp->encoder.funcs->destroy(&dp->encoder);

	return ret;
}

static void exynos_dp_unbind(struct device *dev, struct device *master,
			     void *data)
{
	struct exynos_dp_device *dp = dev_get_drvdata(dev);

	analogix_dp_unbind(dp->adp);
	dp->encoder.funcs->destroy(&dp->encoder);
}

static const struct component_ops exynos_dp_ops = {
	.bind	= exynos_dp_bind,
	.unbind	= exynos_dp_unbind,
};

static int exynos_dp_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np;
	struct exynos_dp_device *dp;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
	int ret;

	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
			  GFP_KERNEL);
	if (!dp)
		return -ENOMEM;

	dp->dev = dev;
	/*
	 * We just use the drvdata until driver run into component
	 * add function, and then we would set drvdata to null, so
	 * that analogix dp driver would take charge of the drvdata.
	 */
	platform_set_drvdata(pdev, dp);

	/* This is for the backward compatibility. */
	np = of_parse_phandle(dev->of_node, "panel", 0);
	if (np) {
		dp->plat_data.panel = of_drm_find_panel(np);

		of_node_put(np);
		if (IS_ERR(dp->plat_data.panel))
			return PTR_ERR(dp->plat_data.panel);

		goto out;
	}

	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
	if (ret)
		return ret;

	/* The remote port can be either a panel or a bridge */
	dp->plat_data.panel = panel;
	dp->plat_data.dev_type = EXYNOS_DP;
	dp->plat_data.power_on_start = exynos_dp_poweron;
	dp->plat_data.power_off = exynos_dp_poweroff;
	dp->plat_data.attach = exynos_dp_bridge_attach;
	dp->plat_data.get_modes = exynos_dp_get_modes;
	dp->plat_data.skip_connector = !!bridge;

	dp->ptn_bridge = bridge;

out:
	dp->adp = analogix_dp_probe(dev, &dp->plat_data);
	if (IS_ERR(dp->adp))
		return PTR_ERR(dp->adp);

	return component_add(&pdev->dev, &exynos_dp_ops);
}

static int exynos_dp_remove(struct platform_device *pdev)
{
	struct exynos_dp_device *dp = platform_get_drvdata(pdev);

	component_del(&pdev->dev, &exynos_dp_ops);
	analogix_dp_remove(dp->adp);

	return 0;
}

#ifdef CONFIG_PM
static int exynos_dp_suspend(struct device *dev)
{
	struct exynos_dp_device *dp = dev_get_drvdata(dev);

	return analogix_dp_suspend(dp->adp);
}

static int exynos_dp_resume(struct device *dev)
{
	struct exynos_dp_device *dp = dev_get_drvdata(dev);

	return analogix_dp_resume(dp->adp);
}
#endif

static const struct dev_pm_ops exynos_dp_pm_ops = {
	SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
				pm_runtime_force_resume)
};

static const struct of_device_id exynos_dp_match[] = {
	{ .compatible = "samsung,exynos5-dp" },
	{},
};
MODULE_DEVICE_TABLE(of, exynos_dp_match);

struct platform_driver dp_driver = {
	.probe		= exynos_dp_probe,
	.remove		= exynos_dp_remove,
	.driver		= {
		.name	= "exynos-dp",
		.owner	= THIS_MODULE,
		.pm	= &exynos_dp_pm_ops,
		.of_match_table = exynos_dp_match,
	},
};

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
MODULE_LICENSE("GPL v2");