summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_dpi.c
blob: 96c87db388fb985614e7d4485b7df569dac40784 (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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
/*
 * Exynos DRM Parallel output support.
 *
 * Copyright (c) 2014 Samsung Electronics Co., Ltd
 *
 * Contacts: Andrzej Hajda <a.hajda@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>

#include <linux/regulator/consumer.h>

#include <video/of_videomode.h>
#include <video/videomode.h>

#include "exynos_drm_drv.h"

struct exynos_dpi {
	struct device *dev;
	struct device_node *panel_node;

	struct drm_panel *panel;
	struct drm_connector connector;
	struct drm_encoder *encoder;

	struct videomode *vm;
	int dpms_mode;
};

#define connector_to_dpi(c) container_of(c, struct exynos_dpi, connector)

static enum drm_connector_status
exynos_dpi_detect(struct drm_connector *connector, bool force)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	if (ctx->panel && !ctx->panel->connector)
		drm_panel_attach(ctx->panel, &ctx->connector);

	return connector_status_connected;
}

static void exynos_dpi_connector_destroy(struct drm_connector *connector)
{
	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);
}

static struct drm_connector_funcs exynos_dpi_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = exynos_dpi_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = exynos_dpi_connector_destroy,
};

static int exynos_dpi_get_modes(struct drm_connector *connector)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	/* fimd timings gets precedence over panel modes */
	if (ctx->vm) {
		struct drm_display_mode *mode;

		mode = drm_mode_create(connector->dev);
		if (!mode) {
			DRM_ERROR("failed to create a new display mode\n");
			return 0;
		}
		drm_display_mode_from_videomode(ctx->vm, mode);
		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
		drm_mode_probed_add(connector, mode);
		return 1;
	}

	if (ctx->panel)
		return ctx->panel->funcs->get_modes(ctx->panel);

	return 0;
}

static struct drm_encoder *
exynos_dpi_best_encoder(struct drm_connector *connector)
{
	struct exynos_dpi *ctx = connector_to_dpi(connector);

	return ctx->encoder;
}

static struct drm_connector_helper_funcs exynos_dpi_connector_helper_funcs = {
	.get_modes = exynos_dpi_get_modes,
	.best_encoder = exynos_dpi_best_encoder,
};

static int exynos_dpi_create_connector(struct exynos_drm_display *display,
				       struct drm_encoder *encoder)
{
	struct exynos_dpi *ctx = display->ctx;
	struct drm_connector *connector = &ctx->connector;
	int ret;

	ctx->encoder = encoder;

	connector->polled = DRM_CONNECTOR_POLL_HPD;

	ret = drm_connector_init(encoder->dev, connector,
				 &exynos_dpi_connector_funcs,
				 DRM_MODE_CONNECTOR_VGA);
	if (ret) {
		DRM_ERROR("failed to initialize connector with drm\n");
		return ret;
	}

	drm_connector_helper_add(connector, &exynos_dpi_connector_helper_funcs);
	drm_connector_register(connector);
	drm_mode_connector_attach_encoder(connector, encoder);

	return 0;
}

static void exynos_dpi_poweron(struct exynos_dpi *ctx)
{
	if (ctx->panel) {
		drm_panel_prepare(ctx->panel);
		drm_panel_enable(ctx->panel);
	}
}

static void exynos_dpi_poweroff(struct exynos_dpi *ctx)
{
	if (ctx->panel) {
		drm_panel_disable(ctx->panel);
		drm_panel_unprepare(ctx->panel);
	}
}

static void exynos_dpi_dpms(struct exynos_drm_display *display, int mode)
{
	struct exynos_dpi *ctx = display->ctx;

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		if (ctx->dpms_mode != DRM_MODE_DPMS_ON)
				exynos_dpi_poweron(ctx);
			break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		if (ctx->dpms_mode == DRM_MODE_DPMS_ON)
			exynos_dpi_poweroff(ctx);
		break;
	default:
		break;
	}
	ctx->dpms_mode = mode;
}

static struct exynos_drm_display_ops exynos_dpi_display_ops = {
	.create_connector = exynos_dpi_create_connector,
	.dpms = exynos_dpi_dpms
};

static struct exynos_drm_display exynos_dpi_display = {
	.type = EXYNOS_DISPLAY_TYPE_LCD,
	.ops = &exynos_dpi_display_ops,
};

/* of_* functions will be removed after merge of of_graph patches */
static struct device_node *
of_get_child_by_name_reg(struct device_node *parent, const char *name, u32 reg)
{
	struct device_node *np;

	for_each_child_of_node(parent, np) {
		u32 r;

		if (!np->name || of_node_cmp(np->name, name))
			continue;

		if (of_property_read_u32(np, "reg", &r) < 0)
			r = 0;

		if (reg == r)
			break;
	}

	return np;
}

static struct device_node *of_graph_get_port_by_reg(struct device_node *parent,
						    u32 reg)
{
	struct device_node *ports, *port;

	ports = of_get_child_by_name(parent, "ports");
	if (ports)
		parent = ports;

	port = of_get_child_by_name_reg(parent, "port", reg);

	of_node_put(ports);

	return port;
}

static struct device_node *
of_graph_get_endpoint_by_reg(struct device_node *port, u32 reg)
{
	return of_get_child_by_name_reg(port, "endpoint", reg);
}

static struct device_node *
of_graph_get_remote_port_parent(const struct device_node *node)
{
	struct device_node *np;
	unsigned int depth;

	np = of_parse_phandle(node, "remote-endpoint", 0);

	/* Walk 3 levels up only if there is 'ports' node. */
	for (depth = 3; depth && np; depth--) {
		np = of_get_next_parent(np);
		if (depth == 2 && of_node_cmp(np->name, "ports"))
			break;
	}
	return np;
}

enum {
	FIMD_PORT_IN0,
	FIMD_PORT_IN1,
	FIMD_PORT_IN2,
	FIMD_PORT_RGB,
	FIMD_PORT_WRB,
};

static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
{
	struct device_node *np, *ep;

	np = of_graph_get_port_by_reg(dev->of_node, FIMD_PORT_RGB);
	if (!np)
		return NULL;

	ep = of_graph_get_endpoint_by_reg(np, 0);
	of_node_put(np);
	if (!ep)
		return NULL;

	np = of_graph_get_remote_port_parent(ep);
	of_node_put(ep);

	return np;
}

static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
{
	struct device *dev = ctx->dev;
	struct device_node *dn = dev->of_node;
	struct device_node *np;

	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);

	np = of_get_child_by_name(dn, "display-timings");
	if (np) {
		struct videomode *vm;
		int ret;

		of_node_put(np);

		vm = devm_kzalloc(dev, sizeof(*ctx->vm), GFP_KERNEL);
		if (!vm)
			return -ENOMEM;

		ret = of_get_videomode(dn, vm, 0);
		if (ret < 0) {
			devm_kfree(dev, vm);
			return ret;
		}

		ctx->vm = vm;

		return 0;
	}

	if (!ctx->panel_node)
		return -EINVAL;

	return 0;
}

struct exynos_drm_display *exynos_dpi_probe(struct device *dev)
{
	struct exynos_dpi *ctx;
	int ret;

	ret = exynos_drm_component_add(dev,
					EXYNOS_DEVICE_TYPE_CONNECTOR,
					exynos_dpi_display.type);
	if (ret)
		return ERR_PTR(ret);

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		goto err_del_component;

	ctx->dev = dev;
	exynos_dpi_display.ctx = ctx;
	ctx->dpms_mode = DRM_MODE_DPMS_OFF;

	ret = exynos_dpi_parse_dt(ctx);
	if (ret < 0) {
		devm_kfree(dev, ctx);
		goto err_del_component;
	}

	if (ctx->panel_node) {
		ctx->panel = of_drm_find_panel(ctx->panel_node);
		if (!ctx->panel) {
			exynos_drm_component_del(dev,
						EXYNOS_DEVICE_TYPE_CONNECTOR);
			return ERR_PTR(-EPROBE_DEFER);
		}
	}

	return &exynos_dpi_display;

err_del_component:
	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);

	return NULL;
}

int exynos_dpi_remove(struct device *dev)
{
	struct drm_encoder *encoder = exynos_dpi_display.encoder;
	struct exynos_dpi *ctx = exynos_dpi_display.ctx;

	exynos_dpi_dpms(&exynos_dpi_display, DRM_MODE_DPMS_OFF);

	exynos_dpi_connector_destroy(&ctx->connector);
	encoder->funcs->destroy(encoder);

	if (ctx->panel)
		drm_panel_detach(ctx->panel);

	exynos_drm_component_del(dev, EXYNOS_DEVICE_TYPE_CONNECTOR);

	return 0;
}