summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tilcdc/tilcdc_panel.c
blob: 580b74e2022b26f9fc950142361321d775f6a9be (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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/*
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <robdclark@gmail.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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/consumer.h>
#include <linux/backlight.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>

#include "tilcdc_drv.h"

struct panel_module {
	struct tilcdc_module base;
	struct tilcdc_panel_info *info;
	struct display_timings *timings;
	struct backlight_device *backlight;
};
#define to_panel_module(x) container_of(x, struct panel_module, base)


/*
 * Encoder:
 */

struct panel_encoder {
	struct drm_encoder base;
	struct panel_module *mod;
};
#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)


static void panel_encoder_destroy(struct drm_encoder *encoder)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	drm_encoder_cleanup(encoder);
	kfree(panel_encoder);
}

static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	struct backlight_device *backlight = panel_encoder->mod->backlight;

	if (!backlight)
		return;

	backlight->props.power = mode == DRM_MODE_DPMS_ON
				     ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
	backlight_update_status(backlight);
}

static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
		const struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	/* nothing needed */
	return true;
}

static void panel_encoder_prepare(struct drm_encoder *encoder)
{
	struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
	tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
}

static void panel_encoder_commit(struct drm_encoder *encoder)
{
	panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}

static void panel_encoder_mode_set(struct drm_encoder *encoder,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	/* nothing needed */
}

static const struct drm_encoder_funcs panel_encoder_funcs = {
		.destroy        = panel_encoder_destroy,
};

static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
		.dpms           = panel_encoder_dpms,
		.mode_fixup     = panel_encoder_mode_fixup,
		.prepare        = panel_encoder_prepare,
		.commit         = panel_encoder_commit,
		.mode_set       = panel_encoder_mode_set,
};

static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
		struct panel_module *mod)
{
	struct panel_encoder *panel_encoder;
	struct drm_encoder *encoder;
	int ret;

	panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
	if (!panel_encoder) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_encoder->mod = mod;

	encoder = &panel_encoder->base;
	encoder->possible_crtcs = 1;

	ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
			DRM_MODE_ENCODER_LVDS);
	if (ret < 0)
		goto fail;

	drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);

	return encoder;

fail:
	panel_encoder_destroy(encoder);
	return NULL;
}

/*
 * Connector:
 */

struct panel_connector {
	struct drm_connector base;

	struct drm_encoder *encoder;  /* our connected encoder */
	struct panel_module *mod;
};
#define to_panel_connector(x) container_of(x, struct panel_connector, base)


static void panel_connector_destroy(struct drm_connector *connector)
{
	struct panel_connector *panel_connector = to_panel_connector(connector);
	drm_connector_cleanup(connector);
	kfree(panel_connector);
}

static enum drm_connector_status panel_connector_detect(
		struct drm_connector *connector,
		bool force)
{
	return connector_status_connected;
}

static int panel_connector_get_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct panel_connector *panel_connector = to_panel_connector(connector);
	struct display_timings *timings = panel_connector->mod->timings;
	int i;

	for (i = 0; i < timings->num_timings; i++) {
		struct drm_display_mode *mode = drm_mode_create(dev);
		struct videomode vm;

		if (videomode_from_timing(timings, &vm, i))
			break;

		drm_display_mode_from_videomode(&vm, mode);

		mode->type = DRM_MODE_TYPE_DRIVER;

		if (timings->native_mode == i)
			mode->type |= DRM_MODE_TYPE_PREFERRED;

		drm_mode_set_name(mode);
		drm_mode_probed_add(connector, mode);
	}

	return i;
}

static int panel_connector_mode_valid(struct drm_connector *connector,
		  struct drm_display_mode *mode)
{
	struct tilcdc_drm_private *priv = connector->dev->dev_private;
	/* our only constraints are what the crtc can generate: */
	return tilcdc_crtc_mode_valid(priv->crtc, mode);
}

static struct drm_encoder *panel_connector_best_encoder(
		struct drm_connector *connector)
{
	struct panel_connector *panel_connector = to_panel_connector(connector);
	return panel_connector->encoder;
}

static const struct drm_connector_funcs panel_connector_funcs = {
	.destroy            = panel_connector_destroy,
	.dpms               = drm_helper_connector_dpms,
	.detect             = panel_connector_detect,
	.fill_modes         = drm_helper_probe_single_connector_modes,
};

static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
	.get_modes          = panel_connector_get_modes,
	.mode_valid         = panel_connector_mode_valid,
	.best_encoder       = panel_connector_best_encoder,
};

static struct drm_connector *panel_connector_create(struct drm_device *dev,
		struct panel_module *mod, struct drm_encoder *encoder)
{
	struct panel_connector *panel_connector;
	struct drm_connector *connector;
	int ret;

	panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
	if (!panel_connector) {
		dev_err(dev->dev, "allocation failed\n");
		return NULL;
	}

	panel_connector->encoder = encoder;
	panel_connector->mod = mod;

	connector = &panel_connector->base;

	drm_connector_init(dev, connector, &panel_connector_funcs,
			DRM_MODE_CONNECTOR_LVDS);
	drm_connector_helper_add(connector, &panel_connector_helper_funcs);

	connector->interlace_allowed = 0;
	connector->doublescan_allowed = 0;

	ret = drm_mode_connector_attach_encoder(connector, encoder);
	if (ret)
		goto fail;

	drm_sysfs_connector_add(connector);

	return connector;

fail:
	panel_connector_destroy(connector);
	return NULL;
}

/*
 * Module:
 */

static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
{
	struct panel_module *panel_mod = to_panel_module(mod);
	struct tilcdc_drm_private *priv = dev->dev_private;
	struct drm_encoder *encoder;
	struct drm_connector *connector;

	encoder = panel_encoder_create(dev, panel_mod);
	if (!encoder)
		return -ENOMEM;

	connector = panel_connector_create(dev, panel_mod, encoder);
	if (!connector)
		return -ENOMEM;

	priv->encoders[priv->num_encoders++] = encoder;
	priv->connectors[priv->num_connectors++] = connector;

	return 0;
}

static void panel_destroy(struct tilcdc_module *mod)
{
	struct panel_module *panel_mod = to_panel_module(mod);

	if (panel_mod->timings) {
		display_timings_release(panel_mod->timings);
		kfree(panel_mod->timings);
	}

	tilcdc_module_cleanup(mod);
	kfree(panel_mod->info);
	kfree(panel_mod);
}

static const struct tilcdc_module_ops panel_module_ops = {
		.modeset_init = panel_modeset_init,
		.destroy = panel_destroy,
};

/*
 * Device:
 */

/* maybe move this somewhere common if it is needed by other outputs? */
static struct tilcdc_panel_info * of_get_panel_info(struct device_node *np)
{
	struct device_node *info_np;
	struct tilcdc_panel_info *info;
	int ret = 0;

	if (!np) {
		pr_err("%s: no devicenode given\n", __func__);
		return NULL;
	}

	info_np = of_get_child_by_name(np, "panel-info");
	if (!info_np) {
		pr_err("%s: could not find panel-info node\n", __func__);
		return NULL;
	}

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		pr_err("%s: allocation failed\n", __func__);
		return NULL;
	}

	ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
	ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
	ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
	ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
	ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
	ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
	ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
	ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
	ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);

	/* optional: */
	info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
	info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");

	if (ret) {
		pr_err("%s: error reading panel-info properties\n", __func__);
		kfree(info);
		return NULL;
	}

	return info;
}

static struct of_device_id panel_of_match[];

static int panel_probe(struct platform_device *pdev)
{
	struct device_node *node = pdev->dev.of_node;
	struct panel_module *panel_mod;
	struct tilcdc_module *mod;
	struct pinctrl *pinctrl;
	int ret = -EINVAL;


	/* bail out early if no DT data: */
	if (!node) {
		dev_err(&pdev->dev, "device-tree data is missing\n");
		return -ENXIO;
	}

	panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
	if (!panel_mod)
		return -ENOMEM;

	mod = &panel_mod->base;

	tilcdc_module_init(mod, "panel", &panel_module_ops);

	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
	if (IS_ERR(pinctrl))
		dev_warn(&pdev->dev, "pins are not configured\n");


	panel_mod->timings = of_get_display_timings(node);
	if (!panel_mod->timings) {
		dev_err(&pdev->dev, "could not get panel timings\n");
		goto fail;
	}

	panel_mod->info = of_get_panel_info(node);
	if (!panel_mod->info) {
		dev_err(&pdev->dev, "could not get panel info\n");
		goto fail;
	}

	panel_mod->backlight = of_find_backlight_by_node(node);
	if (panel_mod->backlight)
		dev_info(&pdev->dev, "found backlight\n");

	return 0;

fail:
	panel_destroy(mod);
	return ret;
}

static int panel_remove(struct platform_device *pdev)
{
	return 0;
}

static struct of_device_id panel_of_match[] = {
		{ .compatible = "ti,tilcdc,panel", },
		{ },
};
MODULE_DEVICE_TABLE(of, panel_of_match);

struct platform_driver panel_driver = {
	.probe = panel_probe,
	.remove = panel_remove,
	.driver = {
		.owner = THIS_MODULE,
		.name = "panel",
		.of_match_table = panel_of_match,
	},
};

int __init tilcdc_panel_init(void)
{
	return platform_driver_register(&panel_driver);
}

void __exit tilcdc_panel_fini(void)
{
	platform_driver_unregister(&panel_driver);
}