summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tegra/output.c
blob: 6a5c7b81fbc5d6453c7b96ab57339400504a913c (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
/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
 *
 * 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 <linux/of_gpio.h>

#include <drm/drm_panel.h>
#include "drm.h"

static int tegra_connector_get_modes(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);
	struct edid *edid = NULL;
	int err = 0;

	/*
	 * If the panel provides one or more modes, use them exclusively and
	 * ignore any other means of obtaining a mode.
	 */
	if (output->panel) {
		err = output->panel->funcs->get_modes(output->panel);
		if (err > 0)
			return err;
	}

	if (output->edid)
		edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
	else if (output->ddc)
		edid = drm_get_edid(connector, output->ddc);

	drm_mode_connector_update_edid_property(connector, edid);

	if (edid) {
		err = drm_add_edid_modes(connector, edid);
		kfree(edid);
	}

	return err;
}

static int tegra_connector_mode_valid(struct drm_connector *connector,
				      struct drm_display_mode *mode)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_mode_status status = MODE_OK;
	int err;

	err = tegra_output_check_mode(output, mode, &status);
	if (err < 0)
		return MODE_ERROR;

	return status;
}

static struct drm_encoder *
tegra_connector_best_encoder(struct drm_connector *connector)
{
	struct tegra_output *output = connector_to_output(connector);

	return &output->encoder;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
	.get_modes = tegra_connector_get_modes,
	.mode_valid = tegra_connector_mode_valid,
	.best_encoder = tegra_connector_best_encoder,
};

static enum drm_connector_status
tegra_connector_detect(struct drm_connector *connector, bool force)
{
	struct tegra_output *output = connector_to_output(connector);
	enum drm_connector_status status = connector_status_unknown;

	if (output->ops->detect)
		return output->ops->detect(output);

	if (gpio_is_valid(output->hpd_gpio)) {
		if (gpio_get_value(output->hpd_gpio) == 0)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;
	} else {
		if (!output->panel)
			status = connector_status_disconnected;
		else
			status = connector_status_connected;

		if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
			status = connector_status_connected;
	}

	return status;
}

static void drm_connector_clear(struct drm_connector *connector)
{
	memset(connector, 0, sizeof(*connector));
}

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

static const struct drm_connector_funcs connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = tegra_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = tegra_connector_destroy,
};

static void drm_encoder_clear(struct drm_encoder *encoder)
{
	memset(encoder, 0, sizeof(*encoder));
}

static void tegra_encoder_destroy(struct drm_encoder *encoder)
{
	drm_encoder_cleanup(encoder);
	drm_encoder_clear(encoder);
}

static const struct drm_encoder_funcs encoder_funcs = {
	.destroy = tegra_encoder_destroy,
};

static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct tegra_output *output = encoder_to_output(encoder);
	struct drm_panel *panel = output->panel;

	if (mode != DRM_MODE_DPMS_ON) {
		drm_panel_disable(panel);
		tegra_output_disable(output);
		drm_panel_unprepare(panel);
	} else {
		drm_panel_prepare(panel);
		tegra_output_enable(output);
		drm_panel_enable(panel);
	}
}

static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder,
				     const struct drm_display_mode *mode,
				     struct drm_display_mode *adjusted)
{
	return true;
}

static void tegra_encoder_prepare(struct drm_encoder *encoder)
{
	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}

static void tegra_encoder_commit(struct drm_encoder *encoder)
{
	tegra_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static void tegra_encoder_mode_set(struct drm_encoder *encoder,
				   struct drm_display_mode *mode,
				   struct drm_display_mode *adjusted)
{
}

static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
	.dpms = tegra_encoder_dpms,
	.mode_fixup = tegra_encoder_mode_fixup,
	.prepare = tegra_encoder_prepare,
	.commit = tegra_encoder_commit,
	.mode_set = tegra_encoder_mode_set,
};

static irqreturn_t hpd_irq(int irq, void *data)
{
	struct tegra_output *output = data;

	if (output->connector.dev)
		drm_helper_hpd_irq_event(output->connector.dev);

	return IRQ_HANDLED;
}

int tegra_output_probe(struct tegra_output *output)
{
	struct device_node *ddc, *panel;
	enum of_gpio_flags flags;
	int err, size;

	if (!output->of_node)
		output->of_node = output->dev->of_node;

	panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
	if (panel) {
		output->panel = of_drm_find_panel(panel);
		if (!output->panel)
			return -EPROBE_DEFER;

		of_node_put(panel);
	}

	output->edid = of_get_property(output->of_node, "nvidia,edid", &size);

	ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
	if (ddc) {
		output->ddc = of_find_i2c_adapter_by_node(ddc);
		if (!output->ddc) {
			err = -EPROBE_DEFER;
			of_node_put(ddc);
			return err;
		}

		of_node_put(ddc);
	}

	output->hpd_gpio = of_get_named_gpio_flags(output->of_node,
						   "nvidia,hpd-gpio", 0,
						   &flags);
	if (gpio_is_valid(output->hpd_gpio)) {
		unsigned long flags;

		err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN,
				       "HDMI hotplug detect");
		if (err < 0) {
			dev_err(output->dev, "gpio_request_one(): %d\n", err);
			return err;
		}

		err = gpio_to_irq(output->hpd_gpio);
		if (err < 0) {
			dev_err(output->dev, "gpio_to_irq(): %d\n", err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->hpd_irq = err;

		flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
			IRQF_ONESHOT;

		err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
					   flags, "hpd", output);
		if (err < 0) {
			dev_err(output->dev, "failed to request IRQ#%u: %d\n",
				output->hpd_irq, err);
			gpio_free(output->hpd_gpio);
			return err;
		}

		output->connector.polled = DRM_CONNECTOR_POLL_HPD;

		/*
		 * Disable the interrupt until the connector has been
		 * initialized to avoid a race in the hotplug interrupt
		 * handler.
		 */
		disable_irq(output->hpd_irq);
	}

	return 0;
}

int tegra_output_remove(struct tegra_output *output)
{
	if (gpio_is_valid(output->hpd_gpio)) {
		free_irq(output->hpd_irq, output);
		gpio_free(output->hpd_gpio);
	}

	if (output->ddc)
		put_device(&output->ddc->dev);

	return 0;
}

int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
{
	int connector, encoder;

	switch (output->type) {
	case TEGRA_OUTPUT_RGB:
		connector = DRM_MODE_CONNECTOR_LVDS;
		encoder = DRM_MODE_ENCODER_LVDS;
		break;

	case TEGRA_OUTPUT_HDMI:
		connector = DRM_MODE_CONNECTOR_HDMIA;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	case TEGRA_OUTPUT_DSI:
		connector = DRM_MODE_CONNECTOR_DSI;
		encoder = DRM_MODE_ENCODER_DSI;
		break;

	case TEGRA_OUTPUT_EDP:
		connector = DRM_MODE_CONNECTOR_eDP;
		encoder = DRM_MODE_ENCODER_TMDS;
		break;

	default:
		connector = DRM_MODE_CONNECTOR_Unknown;
		encoder = DRM_MODE_ENCODER_NONE;
		break;
	}

	drm_connector_init(drm, &output->connector, &connector_funcs,
			   connector);
	drm_connector_helper_add(&output->connector, &connector_helper_funcs);
	output->connector.dpms = DRM_MODE_DPMS_OFF;

	if (output->panel)
		drm_panel_attach(output->panel, &output->connector);

	drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder);
	drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs);

	drm_mode_connector_attach_encoder(&output->connector, &output->encoder);
	drm_connector_register(&output->connector);

	output->encoder.possible_crtcs = 0x3;

	/*
	 * The connector is now registered and ready to receive hotplug events
	 * so the hotplug interrupt can be enabled.
	 */
	if (gpio_is_valid(output->hpd_gpio))
		enable_irq(output->hpd_irq);

	return 0;
}

int tegra_output_exit(struct tegra_output *output)
{
	/*
	 * The connector is going away, so the interrupt must be disabled to
	 * prevent the hotplug interrupt handler from potentially crashing.
	 */
	if (gpio_is_valid(output->hpd_gpio))
		disable_irq(output->hpd_irq);

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

	return 0;
}