summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
blob: 836f4100818710e830229b985591bfc85a047f03 (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
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
/* exynos_drm_fbdev.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "drm_crtc.h"
#include "drm_fb_helper.h"
#include "drm_crtc_helper.h"

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"

#define MAX_CONNECTOR		4
#define PREFERRED_BPP		32

#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
				drm_fb_helper)

struct exynos_drm_fbdev {
	struct drm_fb_helper	drm_fb_helper;
	struct drm_framebuffer	*fb;
};

static int exynos_drm_fbdev_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 18:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	return drm_fb_helper_set_par(info);
}


static struct fb_ops exynos_drm_fb_ops = {
	.owner		= THIS_MODULE,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
	.fb_check_var	= drm_fb_helper_check_var,
	.fb_set_par	= exynos_drm_fbdev_set_par,
	.fb_blank	= drm_fb_helper_blank,
	.fb_pan_display	= drm_fb_helper_pan_display,
	.fb_setcmap	= drm_fb_helper_setcmap,
};

static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
				     struct drm_framebuffer *fb)
{
	struct fb_info *fbi = helper->fbdev;
	struct drm_device *dev = helper->dev;
	struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
	struct exynos_drm_gem_buf *buffer;
	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
	unsigned long offset;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	exynos_fb->fb = fb;

	drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);

	buffer = exynos_drm_fb_get_buf(fb);
	if (!buffer) {
		DRM_LOG_KMS("buffer is null.\n");
		return -EFAULT;
	}

	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
	offset += fbi->var.yoffset * fb->pitch;

	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
	fbi->screen_base = buffer->kvaddr + offset;
	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
	fbi->screen_size = size;
	fbi->fix.smem_len = size;

	return 0;
}

static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
				    struct drm_fb_helper_surface_size *sizes)
{
	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	struct drm_device *dev = helper->dev;
	struct fb_info *fbi;
	struct drm_mode_fb_cmd mode_cmd = { 0 };
	struct platform_device *pdev = dev->platformdev;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
			sizes->surface_width, sizes->surface_height,
			sizes->surface_bpp);

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.bpp = sizes->surface_bpp;
	mode_cmd.depth = sizes->surface_depth;

	mutex_lock(&dev->struct_mutex);

	fbi = framebuffer_alloc(0, &pdev->dev);
	if (!fbi) {
		DRM_ERROR("failed to allocate fb info.\n");
		ret = -ENOMEM;
		goto out;
	}

	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
		DRM_ERROR("failed to create drm framebuffer.\n");
		ret = PTR_ERR(exynos_fbdev->fb);
		goto out;
	}

	helper->fb = exynos_fbdev->fb;
	helper->fbdev = fbi;

	fbi->par = helper;
	fbi->flags = FBINFO_FLAG_DEFAULT;
	fbi->fbops = &exynos_drm_fb_ops;

	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	if (ret) {
		DRM_ERROR("failed to allocate cmap.\n");
		goto out;
	}

	ret = exynos_drm_fbdev_update(helper, helper->fb);
	if (ret < 0)
		fb_dealloc_cmap(&fbi->cmap);

/*
 * if failed, all resources allocated above would be released by
 * drm_mode_config_cleanup() when drm_load() had been called prior
 * to any specific driver such as fimd or hdmi driver.
 */
out:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

static bool
exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
			    struct drm_fb_helper_surface_size *sizes)
{
	if (fb->width != sizes->surface_width)
		return false;
	if (fb->height != sizes->surface_height)
		return false;
	if (fb->bits_per_pixel != sizes->surface_bpp)
		return false;
	if (fb->depth != sizes->surface_depth)
		return false;

	return true;
}

static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
				      struct drm_fb_helper_surface_size *sizes)
{
	struct drm_device *dev = helper->dev;
	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
	struct drm_framebuffer *fb = exynos_fbdev->fb;
	struct drm_mode_fb_cmd mode_cmd = { 0 };

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (helper->fb != fb) {
		DRM_ERROR("drm framebuffer is different\n");
		return -EINVAL;
	}

	if (exynos_drm_fbdev_is_samefb(fb, sizes))
		return 0;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.bpp = sizes->surface_bpp;
	mode_cmd.depth = sizes->surface_depth;

	if (fb->funcs->destroy)
		fb->funcs->destroy(fb);

	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
	if (IS_ERR(exynos_fbdev->fb)) {
		DRM_ERROR("failed to allocate fb.\n");
		return PTR_ERR(exynos_fbdev->fb);
	}

	helper->fb = exynos_fbdev->fb;
	return exynos_drm_fbdev_update(helper, helper->fb);
}

static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
				   struct drm_fb_helper_surface_size *sizes)
{
	int ret = 0;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (!helper->fb) {
		ret = exynos_drm_fbdev_create(helper, sizes);
		if (ret < 0) {
			DRM_ERROR("failed to create fbdev.\n");
			return ret;
		}

		/*
		 * fb_helper expects a value more than 1 if succeed
		 * because register_framebuffer() should be called.
		 */
		ret = 1;
	} else {
		ret = exynos_drm_fbdev_recreate(helper, sizes);
		if (ret < 0) {
			DRM_ERROR("failed to reconfigure fbdev\n");
			return ret;
		}
	}

	return ret;
}

static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	.fb_probe =	exynos_drm_fbdev_probe,
};

int exynos_drm_fbdev_init(struct drm_device *dev)
{
	struct exynos_drm_fbdev *fbdev;
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *helper;
	unsigned int num_crtc;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
		return 0;

	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	if (!fbdev) {
		DRM_ERROR("failed to allocate drm fbdev.\n");
		return -ENOMEM;
	}

	private->fb_helper = helper = &fbdev->drm_fb_helper;
	helper->funcs = &exynos_drm_fb_helper_funcs;

	num_crtc = dev->mode_config.num_crtc;

	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	if (ret < 0) {
		DRM_ERROR("failed to initialize drm fb helper.\n");
		goto err_init;
	}

	ret = drm_fb_helper_single_add_all_connectors(helper);
	if (ret < 0) {
		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
		goto err_setup;

	}

	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	if (ret < 0) {
		DRM_ERROR("failed to set up hw configuration.\n");
		goto err_setup;
	}

	return 0;

err_setup:
	drm_fb_helper_fini(helper);

err_init:
	private->fb_helper = NULL;
	kfree(fbdev);

	return ret;
}

static void exynos_drm_fbdev_destroy(struct drm_device *dev,
				      struct drm_fb_helper *fb_helper)
{
	struct drm_framebuffer *fb;

	/* release drm framebuffer and real buffer */
	if (fb_helper->fb && fb_helper->fb->funcs) {
		fb = fb_helper->fb;
		if (fb && fb->funcs->destroy)
			fb->funcs->destroy(fb);
	}

	/* release linux framebuffer */
	if (fb_helper->fbdev) {
		struct fb_info *info;
		int ret;

		info = fb_helper->fbdev;
		ret = unregister_framebuffer(info);
		if (ret < 0)
			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");

		if (info->cmap.len)
			fb_dealloc_cmap(&info->cmap);

		framebuffer_release(info);
	}

	drm_fb_helper_fini(fb_helper);
}

void exynos_drm_fbdev_fini(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_fbdev *fbdev;

	if (!private || !private->fb_helper)
		return;

	fbdev = to_exynos_fbdev(private->fb_helper);

	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	kfree(fbdev);
	private->fb_helper = NULL;
}

void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;

	if (!private || !private->fb_helper)
		return;

	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
}

int exynos_drm_fbdev_reinit(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *fb_helper;
	int ret;

	if (!private)
		return -EINVAL;

	/*
	 * if all sub drivers were unloaded then num_connector is 0
	 * so at this time, the framebuffers also should be destroyed.
	 */
	if (!dev->mode_config.num_connector) {
		exynos_drm_fbdev_fini(dev);
		return 0;
	}

	fb_helper = private->fb_helper;

	if (fb_helper) {
		struct list_head temp_list;

		INIT_LIST_HEAD(&temp_list);

		/*
		 * fb_helper is reintialized but kernel fb is reused
		 * so kernel_fb_list need to be backuped and restored
		 */
		if (!list_empty(&fb_helper->kernel_fb_list))
			list_replace_init(&fb_helper->kernel_fb_list,
					&temp_list);

		drm_fb_helper_fini(fb_helper);

		ret = drm_fb_helper_init(dev, fb_helper,
				dev->mode_config.num_crtc, MAX_CONNECTOR);
		if (ret < 0) {
			DRM_ERROR("failed to initialize drm fb helper\n");
			return ret;
		}

		if (!list_empty(&temp_list))
			list_replace(&temp_list, &fb_helper->kernel_fb_list);

		ret = drm_fb_helper_single_add_all_connectors(fb_helper);
		if (ret < 0) {
			DRM_ERROR("failed to add fb helper to connectors\n");
			goto err;
		}

		ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
		if (ret < 0) {
			DRM_ERROR("failed to set up hw configuration.\n");
			goto err;
		}
	} else {
		/*
		 * if drm_load() failed whem drm load() was called prior
		 * to specific drivers, fb_helper must be NULL and so
		 * this fuction should be called again to re-initialize and
		 * re-configure the fb helper. it means that this function
		 * has been called by the specific drivers.
		 */
		ret = exynos_drm_fbdev_init(dev);
	}

	return ret;

err:
	/*
	 * if drm_load() failed when drm load() was called prior
	 * to specific drivers, the fb_helper must be NULL and so check it.
	 */
	if (fb_helper)
		drm_fb_helper_fini(fb_helper);

	return ret;
}

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
MODULE_LICENSE("GPL");