aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/imx/parallel-display.c
blob: a8aba0141ce712db31dcedef39fb287e7afb37c2 (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
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
// SPDX-License-Identifier: GPL-2.0+
/*
 * i.MX drm driver - parallel display implementation
 *
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 */

#include <linux/component.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>

#include <video/of_display_timing.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>

#include "imx-drm.h"

struct imx_parallel_display_encoder {
	struct drm_connector connector;
	struct drm_encoder encoder;
	struct drm_bridge bridge;
	struct imx_parallel_display *pd;
};

struct imx_parallel_display {
	struct device *dev;
	void *edid;
	u32 bus_format;
	u32 bus_flags;
	struct drm_display_mode mode;
	struct drm_panel *panel;
	struct drm_bridge *next_bridge;
};

static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
{
	return container_of(c, struct imx_parallel_display_encoder, connector)->pd;
}

static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
{
	return container_of(b, struct imx_parallel_display_encoder, bridge)->pd;
}

static int imx_pd_connector_get_modes(struct drm_connector *connector)
{
	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
	struct device_node *np = imxpd->dev->of_node;
	int num_modes;

	num_modes = drm_panel_get_modes(imxpd->panel, connector);
	if (num_modes > 0)
		return num_modes;

	if (imxpd->edid) {
		drm_connector_update_edid_property(connector, imxpd->edid);
		num_modes = drm_add_edid_modes(connector, imxpd->edid);
	}

	if (np) {
		struct drm_display_mode *mode = drm_mode_create(connector->dev);
		int ret;

		if (!mode)
			return -EINVAL;

		ret = of_get_drm_display_mode(np, &imxpd->mode,
					      &imxpd->bus_flags,
					      OF_USE_NATIVE_MODE);
		if (ret)
			return ret;

		drm_mode_copy(mode, &imxpd->mode);
		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
		drm_mode_probed_add(connector, mode);
		num_modes++;
	}

	return num_modes;
}

static void imx_pd_bridge_enable(struct drm_bridge *bridge)
{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

	drm_panel_prepare(imxpd->panel);
	drm_panel_enable(imxpd->panel);
}

static void imx_pd_bridge_disable(struct drm_bridge *bridge)
{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);

	drm_panel_disable(imxpd->panel);
	drm_panel_unprepare(imxpd->panel);
}

static const u32 imx_pd_bus_fmts[] = {
	MEDIA_BUS_FMT_RGB888_1X24,
	MEDIA_BUS_FMT_BGR888_1X24,
	MEDIA_BUS_FMT_GBR888_1X24,
	MEDIA_BUS_FMT_RGB666_1X18,
	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
	MEDIA_BUS_FMT_RGB565_1X16,
};

static u32 *
imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
					 struct drm_bridge_state *bridge_state,
					 struct drm_crtc_state *crtc_state,
					 struct drm_connector_state *conn_state,
					 unsigned int *num_output_fmts)
{
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *output_fmts;

	if (!imxpd->bus_format && !di->num_bus_formats) {
		*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
		return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
			       GFP_KERNEL);
	}

	*num_output_fmts = 1;
	output_fmts = kmalloc(sizeof(*output_fmts), GFP_KERNEL);
	if (!output_fmts)
		return NULL;

	if (!imxpd->bus_format && di->num_bus_formats)
		output_fmts[0] = di->bus_formats[0];
	else
		output_fmts[0] = imxpd->bus_format;

	return output_fmts;
}

static bool imx_pd_format_supported(u32 output_fmt)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
		if (imx_pd_bus_fmts[i] == output_fmt)
			return true;
	}

	return false;
}

static u32 *
imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
					struct drm_bridge_state *bridge_state,
					struct drm_crtc_state *crtc_state,
					struct drm_connector_state *conn_state,
					u32 output_fmt,
					unsigned int *num_input_fmts)
{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *input_fmts;

	/*
	 * If the next bridge does not support bus format negotiation, let's
	 * use the static bus format definition (imxpd->bus_format) if it's
	 * specified, RGB888 when it's not.
	 */
	if (output_fmt == MEDIA_BUS_FMT_FIXED)
		output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;

	/* Now make sure the requested output format is supported. */
	if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
	    !imx_pd_format_supported(output_fmt)) {
		*num_input_fmts = 0;
		return NULL;
	}

	*num_input_fmts = 1;
	input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
	if (!input_fmts)
		return NULL;

	input_fmts[0] = output_fmt;
	return input_fmts;
}

static int imx_pd_bridge_atomic_check(struct drm_bridge *bridge,
				      struct drm_bridge_state *bridge_state,
				      struct drm_crtc_state *crtc_state,
				      struct drm_connector_state *conn_state)
{
	struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	struct drm_bridge_state *next_bridge_state = NULL;
	struct drm_bridge *next_bridge;
	u32 bus_flags, bus_fmt;

	next_bridge = drm_bridge_get_next_bridge(bridge);
	if (next_bridge)
		next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
								    next_bridge);

	if (next_bridge_state)
		bus_flags = next_bridge_state->input_bus_cfg.flags;
	else if (di->num_bus_formats)
		bus_flags = di->bus_flags;
	else
		bus_flags = imxpd->bus_flags;

	bus_fmt = bridge_state->input_bus_cfg.format;
	if (!imx_pd_format_supported(bus_fmt))
		return -EINVAL;

	if (bus_flags &
	    ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
	      DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
	      DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)) {
		dev_warn(imxpd->dev, "invalid bus_flags (%x)\n", bus_flags);
		return -EINVAL;
	}

	bridge_state->output_bus_cfg.flags = bus_flags;
	bridge_state->input_bus_cfg.flags = bus_flags;
	imx_crtc_state->bus_flags = bus_flags;
	imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
	imx_crtc_state->di_hsync_pin = 2;
	imx_crtc_state->di_vsync_pin = 3;

	return 0;
}

static const struct drm_connector_funcs imx_pd_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = imx_drm_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
	.get_modes = imx_pd_connector_get_modes,
};

static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
	.enable = imx_pd_bridge_enable,
	.disable = imx_pd_bridge_disable,
	.atomic_reset = drm_atomic_helper_bridge_reset,
	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
	.atomic_check = imx_pd_bridge_atomic_check,
	.atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
	.atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
};

static int imx_pd_bind(struct device *dev, struct device *master, void *data)
{
	struct drm_device *drm = data;
	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
	struct imx_parallel_display_encoder *imxpd_encoder;
	struct drm_connector *connector;
	struct drm_encoder *encoder;
	struct drm_bridge *bridge;
	int ret;

	imxpd_encoder = drmm_simple_encoder_alloc(drm, struct imx_parallel_display_encoder,
						  encoder, DRM_MODE_ENCODER_NONE);
	if (IS_ERR(imxpd_encoder))
		return PTR_ERR(imxpd_encoder);

	imxpd_encoder->pd = imxpd;
	connector = &imxpd_encoder->connector;
	encoder = &imxpd_encoder->encoder;
	bridge = &imxpd_encoder->bridge;

	ret = imx_drm_encoder_parse_of(drm, encoder, imxpd->dev->of_node);
	if (ret)
		return ret;

	/* set the connector's dpms to OFF so that
	 * drm_helper_connector_dpms() won't return
	 * immediately since the current state is ON
	 * at this point.
	 */
	connector->dpms = DRM_MODE_DPMS_OFF;

	bridge->funcs = &imx_pd_bridge_funcs;
	drm_bridge_attach(encoder, bridge, NULL, 0);

	if (imxpd->next_bridge) {
		ret = drm_bridge_attach(encoder, imxpd->next_bridge, bridge, 0);
		if (ret < 0)
			return ret;
	} else {
		drm_connector_helper_add(connector,
					 &imx_pd_connector_helper_funcs);
		drm_connector_init(drm, connector, &imx_pd_connector_funcs,
				   DRM_MODE_CONNECTOR_DPI);

		drm_connector_attach_encoder(connector, encoder);
	}

	return 0;
}

static const struct component_ops imx_pd_ops = {
	.bind	= imx_pd_bind,
};

static int imx_pd_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const u8 *edidp;
	struct imx_parallel_display *imxpd;
	int edid_len;
	int ret;
	u32 bus_format = 0;
	const char *fmt;

	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
	if (!imxpd)
		return -ENOMEM;

	/* port@1 is the output port */
	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
					  &imxpd->next_bridge);
	if (ret && ret != -ENODEV)
		return ret;

	edidp = of_get_property(np, "edid", &edid_len);
	if (edidp)
		imxpd->edid = devm_kmemdup(dev, edidp, edid_len, GFP_KERNEL);

	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
	if (!ret) {
		if (!strcmp(fmt, "rgb24"))
			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
		else if (!strcmp(fmt, "rgb565"))
			bus_format = MEDIA_BUS_FMT_RGB565_1X16;
		else if (!strcmp(fmt, "bgr666"))
			bus_format = MEDIA_BUS_FMT_RGB666_1X18;
		else if (!strcmp(fmt, "lvds666"))
			bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
	}
	imxpd->bus_format = bus_format;

	imxpd->dev = dev;

	platform_set_drvdata(pdev, imxpd);

	return component_add(dev, &imx_pd_ops);
}

static int imx_pd_remove(struct platform_device *pdev)
{
	component_del(&pdev->dev, &imx_pd_ops);

	return 0;
}

static const struct of_device_id imx_pd_dt_ids[] = {
	{ .compatible = "fsl,imx-parallel-display", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);

static struct platform_driver imx_pd_driver = {
	.probe		= imx_pd_probe,
	.remove		= imx_pd_remove,
	.driver		= {
		.of_match_table = imx_pd_dt_ids,
		.name	= "imx-parallel-display",
	},
};

module_platform_driver(imx_pd_driver);

MODULE_DESCRIPTION("i.MX parallel display driver");
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-parallel-display");