aboutsummaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_hdmi.c
blob: aaa550d622f03c047ca2ecf7c19fec8722f52747 (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
437
438
439
440
441
442
/*
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <drm/drmP.h>

#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_hdmi.h"

#define to_context(dev)		platform_get_drvdata(to_platform_device(dev))
#define to_subdrv(dev)		to_context(dev)
#define get_ctx_from_subdrv(subdrv)	container_of(subdrv,\
					struct drm_hdmi_context, subdrv);

/* platform device pointer for common drm hdmi device. */
static struct platform_device *exynos_drm_hdmi_pdev;

/* Common hdmi subdrv needs to access the hdmi and mixer though context.
* These should be initialied by the repective drivers */
static struct exynos_drm_hdmi_context *hdmi_ctx;
static struct exynos_drm_hdmi_context *mixer_ctx;

/* these callback points shoud be set by specific drivers. */
static struct exynos_hdmi_ops *hdmi_ops;
static struct exynos_mixer_ops *mixer_ops;

struct drm_hdmi_context {
	struct exynos_drm_subdrv	subdrv;
	struct exynos_drm_hdmi_context	*hdmi_ctx;
	struct exynos_drm_hdmi_context	*mixer_ctx;

	bool	enabled[MIXER_WIN_NR];
};

int exynos_platform_device_hdmi_register(void)
{
	struct platform_device *pdev;

	if (exynos_drm_hdmi_pdev)
		return -EEXIST;

	pdev = platform_device_register_simple(
			"exynos-drm-hdmi", -1, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	exynos_drm_hdmi_pdev = pdev;

	return 0;
}

void exynos_platform_device_hdmi_unregister(void)
{
	if (exynos_drm_hdmi_pdev) {
		platform_device_unregister(exynos_drm_hdmi_pdev);
		exynos_drm_hdmi_pdev = NULL;
	}
}

void exynos_hdmi_drv_attach(struct exynos_drm_hdmi_context *ctx)
{
	if (ctx)
		hdmi_ctx = ctx;
}

void exynos_mixer_drv_attach(struct exynos_drm_hdmi_context *ctx)
{
	if (ctx)
		mixer_ctx = ctx;
}

void exynos_hdmi_ops_register(struct exynos_hdmi_ops *ops)
{
	if (ops)
		hdmi_ops = ops;
}

void exynos_mixer_ops_register(struct exynos_mixer_ops *ops)
{
	if (ops)
		mixer_ops = ops;
}

static bool drm_hdmi_is_connected(struct device *dev)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	if (hdmi_ops && hdmi_ops->is_connected)
		return hdmi_ops->is_connected(ctx->hdmi_ctx->ctx);

	return false;
}

static struct edid *drm_hdmi_get_edid(struct device *dev,
			struct drm_connector *connector)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	if (hdmi_ops && hdmi_ops->get_edid)
		return hdmi_ops->get_edid(ctx->hdmi_ctx->ctx, connector);

	return NULL;
}

static int drm_hdmi_check_mode(struct device *dev,
		struct drm_display_mode *mode)
{
	struct drm_hdmi_context *ctx = to_context(dev);
	int ret = 0;

	/*
	* Both, mixer and hdmi should be able to handle the requested mode.
	* If any of the two fails, return mode as BAD.
	*/

	if (mixer_ops && mixer_ops->check_mode)
		ret = mixer_ops->check_mode(ctx->mixer_ctx->ctx, mode);

	if (ret)
		return ret;

	if (hdmi_ops && hdmi_ops->check_mode)
		return hdmi_ops->check_mode(ctx->hdmi_ctx->ctx, mode);

	return 0;
}

static int drm_hdmi_power_on(struct device *dev, int mode)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	if (hdmi_ops && hdmi_ops->power_on)
		return hdmi_ops->power_on(ctx->hdmi_ctx->ctx, mode);

	return 0;
}

static struct exynos_drm_display_ops drm_hdmi_display_ops = {
	.type = EXYNOS_DISPLAY_TYPE_HDMI,
	.is_connected = drm_hdmi_is_connected,
	.get_edid = drm_hdmi_get_edid,
	.check_mode = drm_hdmi_check_mode,
	.power_on = drm_hdmi_power_on,
};

static int drm_hdmi_enable_vblank(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);
	struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
	struct exynos_drm_manager *manager = subdrv->manager;

	if (mixer_ops && mixer_ops->enable_vblank)
		return mixer_ops->enable_vblank(ctx->mixer_ctx->ctx,
						manager->pipe);

	return 0;
}

static void drm_hdmi_disable_vblank(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (mixer_ops && mixer_ops->disable_vblank)
		return mixer_ops->disable_vblank(ctx->mixer_ctx->ctx);
}

static void drm_hdmi_wait_for_vblank(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (mixer_ops && mixer_ops->wait_for_vblank)
		mixer_ops->wait_for_vblank(ctx->mixer_ctx->ctx);
}

static void drm_hdmi_mode_fixup(struct device *subdrv_dev,
				struct drm_connector *connector,
				const struct drm_display_mode *mode,
				struct drm_display_mode *adjusted_mode)
{
	struct drm_display_mode *m;
	int mode_ok;

	drm_mode_set_crtcinfo(adjusted_mode, 0);

	mode_ok = drm_hdmi_check_mode(subdrv_dev, adjusted_mode);

	/* just return if user desired mode exists. */
	if (mode_ok == 0)
		return;

	/*
	 * otherwise, find the most suitable mode among modes and change it
	 * to adjusted_mode.
	 */
	list_for_each_entry(m, &connector->modes, head) {
		mode_ok = drm_hdmi_check_mode(subdrv_dev, m);

		if (mode_ok == 0) {
			struct drm_mode_object base;
			struct list_head head;

			DRM_INFO("desired mode doesn't exist so\n");
			DRM_INFO("use the most suitable mode among modes.\n");

			DRM_DEBUG_KMS("Adjusted Mode: [%d]x[%d] [%d]Hz\n",
				m->hdisplay, m->vdisplay, m->vrefresh);

			/* preserve display mode header while copying. */
			head = adjusted_mode->head;
			base = adjusted_mode->base;
			memcpy(adjusted_mode, m, sizeof(*m));
			adjusted_mode->head = head;
			adjusted_mode->base = base;
			break;
		}
	}
}

static void drm_hdmi_mode_set(struct device *subdrv_dev, void *mode)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (hdmi_ops && hdmi_ops->mode_set)
		hdmi_ops->mode_set(ctx->hdmi_ctx->ctx, mode);
}

static void drm_hdmi_get_max_resol(struct device *subdrv_dev,
				unsigned int *width, unsigned int *height)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (hdmi_ops && hdmi_ops->get_max_resol)
		hdmi_ops->get_max_resol(ctx->hdmi_ctx->ctx, width, height);
}

static void drm_hdmi_commit(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (hdmi_ops && hdmi_ops->commit)
		hdmi_ops->commit(ctx->hdmi_ctx->ctx);
}

static void drm_hdmi_dpms(struct device *subdrv_dev, int mode)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (mixer_ops && mixer_ops->dpms)
		mixer_ops->dpms(ctx->mixer_ctx->ctx, mode);

	if (hdmi_ops && hdmi_ops->dpms)
		hdmi_ops->dpms(ctx->hdmi_ctx->ctx, mode);
}

static void drm_hdmi_apply(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);
	int i;

	for (i = 0; i < MIXER_WIN_NR; i++) {
		if (!ctx->enabled[i])
			continue;
		if (mixer_ops && mixer_ops->win_commit)
			mixer_ops->win_commit(ctx->mixer_ctx->ctx, i);
	}

	if (hdmi_ops && hdmi_ops->commit)
		hdmi_ops->commit(ctx->hdmi_ctx->ctx);
}

static struct exynos_drm_manager_ops drm_hdmi_manager_ops = {
	.dpms = drm_hdmi_dpms,
	.apply = drm_hdmi_apply,
	.enable_vblank = drm_hdmi_enable_vblank,
	.disable_vblank = drm_hdmi_disable_vblank,
	.wait_for_vblank = drm_hdmi_wait_for_vblank,
	.mode_fixup = drm_hdmi_mode_fixup,
	.mode_set = drm_hdmi_mode_set,
	.get_max_resol = drm_hdmi_get_max_resol,
	.commit = drm_hdmi_commit,
};

static void drm_mixer_mode_set(struct device *subdrv_dev,
		struct exynos_drm_overlay *overlay)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	if (mixer_ops && mixer_ops->win_mode_set)
		mixer_ops->win_mode_set(ctx->mixer_ctx->ctx, overlay);
}

static void drm_mixer_commit(struct device *subdrv_dev, int zpos)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);
	int win = (zpos == DEFAULT_ZPOS) ? MIXER_DEFAULT_WIN : zpos;

	if (win < 0 || win >= MIXER_WIN_NR) {
		DRM_ERROR("mixer window[%d] is wrong\n", win);
		return;
	}

	if (mixer_ops && mixer_ops->win_commit)
		mixer_ops->win_commit(ctx->mixer_ctx->ctx, win);

	ctx->enabled[win] = true;
}

static void drm_mixer_disable(struct device *subdrv_dev, int zpos)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);
	int win = (zpos == DEFAULT_ZPOS) ? MIXER_DEFAULT_WIN : zpos;

	if (win < 0 || win >= MIXER_WIN_NR) {
		DRM_ERROR("mixer window[%d] is wrong\n", win);
		return;
	}

	if (mixer_ops && mixer_ops->win_disable)
		mixer_ops->win_disable(ctx->mixer_ctx->ctx, win);

	ctx->enabled[win] = false;
}

static struct exynos_drm_overlay_ops drm_hdmi_overlay_ops = {
	.mode_set = drm_mixer_mode_set,
	.commit = drm_mixer_commit,
	.disable = drm_mixer_disable,
};

static struct exynos_drm_manager hdmi_manager = {
	.pipe		= -1,
	.ops		= &drm_hdmi_manager_ops,
	.overlay_ops	= &drm_hdmi_overlay_ops,
	.display_ops	= &drm_hdmi_display_ops,
};

static int hdmi_subdrv_probe(struct drm_device *drm_dev,
		struct device *dev)
{
	struct exynos_drm_subdrv *subdrv = to_subdrv(dev);
	struct drm_hdmi_context *ctx;

	if (!hdmi_ctx) {
		DRM_ERROR("hdmi context not initialized.\n");
		return -EFAULT;
	}

	if (!mixer_ctx) {
		DRM_ERROR("mixer context not initialized.\n");
		return -EFAULT;
	}

	ctx = get_ctx_from_subdrv(subdrv);

	if (!ctx) {
		DRM_ERROR("no drm hdmi context.\n");
		return -EFAULT;
	}

	ctx->hdmi_ctx = hdmi_ctx;
	ctx->mixer_ctx = mixer_ctx;

	ctx->hdmi_ctx->drm_dev = drm_dev;
	ctx->mixer_ctx->drm_dev = drm_dev;

	if (mixer_ops->iommu_on)
		mixer_ops->iommu_on(ctx->mixer_ctx->ctx, true);

	return 0;
}

static void hdmi_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
{
	struct drm_hdmi_context *ctx;
	struct exynos_drm_subdrv *subdrv = to_subdrv(dev);

	ctx = get_ctx_from_subdrv(subdrv);

	if (mixer_ops->iommu_on)
		mixer_ops->iommu_on(ctx->mixer_ctx->ctx, false);
}

static int exynos_drm_hdmi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct exynos_drm_subdrv *subdrv;
	struct drm_hdmi_context *ctx;

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx) {
		DRM_LOG_KMS("failed to alloc common hdmi context.\n");
		return -ENOMEM;
	}

	subdrv = &ctx->subdrv;

	subdrv->dev = dev;
	subdrv->manager = &hdmi_manager;
	subdrv->probe = hdmi_subdrv_probe;
	subdrv->remove = hdmi_subdrv_remove;

	platform_set_drvdata(pdev, subdrv);

	exynos_drm_subdrv_register(subdrv);

	return 0;
}

static int exynos_drm_hdmi_remove(struct platform_device *pdev)
{
	struct drm_hdmi_context *ctx = platform_get_drvdata(pdev);

	exynos_drm_subdrv_unregister(&ctx->subdrv);

	return 0;
}

struct platform_driver exynos_drm_common_hdmi_driver = {
	.probe		= exynos_drm_hdmi_probe,
	.remove		= exynos_drm_hdmi_remove,
	.driver		= {
		.name	= "exynos-drm-hdmi",
		.owner	= THIS_MODULE,
	},
};