[deliverable/linux.git] / drivers / gpu / drm / exynos / exynos_drm_fb.c

/* exynos_drm_fb.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>
 *
 * 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 <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <uapi/drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_iommu.h"
#include "exynos_drm_encoder.h"

#define to_exynos_fb(x)	container_of(x, struct exynos_drm_fb, fb)

/*
 * exynos specific framebuffer structure.
 *
 * @fb: drm framebuffer obejct.
 * @buf_cnt: a buffer count to drm framebuffer.
 * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
 */
struct exynos_drm_fb {
	struct drm_framebuffer		fb;
	unsigned int			buf_cnt;
	struct exynos_drm_gem_obj	*exynos_gem_obj[MAX_FB_BUFFER];
};

static int check_fb_gem_memory_type(struct drm_device *drm_dev,
				struct exynos_drm_gem_obj *exynos_gem_obj)
{
	unsigned int flags;

	/*
	 * if exynos drm driver supports iommu then framebuffer can use
	 * all the buffer types.
	 */
	if (is_drm_iommu_supported(drm_dev))
		return 0;

	flags = exynos_gem_obj->flags;

	/*
	 * without iommu support, not support physically non-continuous memory
	 * for framebuffer.
	 */
	if (IS_NONCONTIG_BUFFER(flags)) {
		DRM_ERROR("cannot use this gem memory type for fb.\n");
		return -EINVAL;
	}

	return 0;
}

static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	unsigned int i;

	/* make sure that overlay data are updated before relesing fb. */
	exynos_drm_encoder_complete_scanout(fb);

	drm_framebuffer_cleanup(fb);

	for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
		struct drm_gem_object *obj;

		if (exynos_fb->exynos_gem_obj[i] == NULL)
			continue;

		obj = &exynos_fb->exynos_gem_obj[i]->base;
		drm_gem_object_unreference_unlocked(obj);
	}

	kfree(exynos_fb);
	exynos_fb = NULL;
}

static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);

	/* This fb should have only one gem object. */
	if (WARN_ON(exynos_fb->buf_cnt != 1))
		return -EINVAL;

	return drm_gem_handle_create(file_priv,
			&exynos_fb->exynos_gem_obj[0]->base, handle);
}

static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
				struct drm_file *file_priv, unsigned flags,
				unsigned color, struct drm_clip_rect *clips,
				unsigned num_clips)
{
	/* TODO */

	return 0;
}

static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
	.destroy	= exynos_drm_fb_destroy,
	.create_handle	= exynos_drm_fb_create_handle,
	.dirty		= exynos_drm_fb_dirty,
};

void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
						unsigned int cnt)
{
	struct exynos_drm_fb *exynos_fb;

	exynos_fb = to_exynos_fb(fb);

	exynos_fb->buf_cnt = cnt;
}

unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
{
	struct exynos_drm_fb *exynos_fb;

	exynos_fb = to_exynos_fb(fb);

	return exynos_fb->buf_cnt;
}

struct drm_framebuffer *
exynos_drm_framebuffer_init(struct drm_device *dev,
			    struct drm_mode_fb_cmd2 *mode_cmd,
			    struct drm_gem_object *obj)
{
	struct exynos_drm_fb *exynos_fb;
	struct exynos_drm_gem_obj *exynos_gem_obj;
	int ret;

	exynos_gem_obj = to_exynos_gem_obj(obj);

	ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
	if (ret < 0) {
		DRM_ERROR("cannot use this gem memory type for fb.\n");
		return ERR_PTR(-EINVAL);
	}

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

	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
	exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;

	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
	if (ret) {
		DRM_ERROR("failed to initialize framebuffer\n");
		return ERR_PTR(ret);
	}

	return &exynos_fb->fb;
}

static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
{
	unsigned int cnt = 0;

	if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
		return drm_format_num_planes(mode_cmd->pixel_format);

	while (cnt != MAX_FB_BUFFER) {
		if (!mode_cmd->handles[cnt])
			break;
		cnt++;
	}

	/*
	 * check if NV12 or NV12M.
	 *
	 * NV12
	 * handles[0] = base1, offsets[0] = 0
	 * handles[1] = base1, offsets[1] = Y_size
	 *
	 * NV12M
	 * handles[0] = base1, offsets[0] = 0
	 * handles[1] = base2, offsets[1] = 0
	 */
	if (cnt == 2) {
		/*
		 * in case of NV12 format, offsets[1] is not 0 and
		 * handles[0] is same as handles[1].
		 */
		if (mode_cmd->offsets[1] &&
			mode_cmd->handles[0] == mode_cmd->handles[1])
			cnt = 1;
	}

	return cnt;
}

static struct drm_framebuffer *
exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
		      struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct exynos_drm_fb *exynos_fb;
	int i, ret;

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

	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object\n");
		ret = -ENOENT;
		goto err_free;
	}

	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
	exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
	exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);

	DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);

	for (i = 1; i < exynos_fb->buf_cnt; i++) {
		obj = drm_gem_object_lookup(dev, file_priv,
				mode_cmd->handles[i]);
		if (!obj) {
			DRM_ERROR("failed to lookup gem object\n");
			ret = -ENOENT;
			exynos_fb->buf_cnt = i;
			goto err_unreference;
		}

		exynos_gem_obj = to_exynos_gem_obj(obj);
		exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;

		ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
		if (ret < 0) {
			DRM_ERROR("cannot use this gem memory type for fb.\n");
			goto err_unreference;
		}
	}

	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
	if (ret) {
		DRM_ERROR("failed to init framebuffer.\n");
		goto err_unreference;
	}

	return &exynos_fb->fb;

err_unreference:
	for (i = 0; i < exynos_fb->buf_cnt; i++) {
		struct drm_gem_object *obj;

		obj = &exynos_fb->exynos_gem_obj[i]->base;
		if (obj)
			drm_gem_object_unreference_unlocked(obj);
	}
err_free:
	kfree(exynos_fb);
	return ERR_PTR(ret);
}

struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
						int index)
{
	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	struct exynos_drm_gem_buf *buffer;

	if (index >= MAX_FB_BUFFER)
		return NULL;

	buffer = exynos_fb->exynos_gem_obj[index]->buffer;
	if (!buffer)
		return NULL;

	DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);

	return buffer;
}

static void exynos_drm_output_poll_changed(struct drm_device *dev)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_fb_helper *fb_helper = private->fb_helper;

	if (fb_helper)
		drm_fb_helper_hotplug_event(fb_helper);
}

static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
	.fb_create = exynos_user_fb_create,
	.output_poll_changed = exynos_drm_output_poll_changed,
};

void exynos_drm_mode_config_init(struct drm_device *dev)
{
	dev->mode_config.min_width = 0;
	dev->mode_config.min_height = 0;

	/*
	 * set max width and height as default value(4096x4096).
	 * this value would be used to check framebuffer size limitation
	 * at drm_mode_addfb().
	 */
	dev->mode_config.max_width = 4096;
	dev->mode_config.max_height = 4096;

	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
}
Commit	Line	Data
1c248b7d ID	1	/* exynos_drm_fb.c
	2	*
	3	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	4	* Authors:
	5	* Inki Dae <inki.dae@samsung.com>
	6	* Joonyoung Shim <jy0922.shim@samsung.com>
	7	* Seung-Woo Kim <sw0312.kim@samsung.com>
	8	*
d81aecb5 ID	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
1c248b7d ID	13	*/
1c248b7d ID	14
760285e7 DH	15	#include <drm/drmP.h>
	16	#include <drm/drm_crtc.h>
	17	#include <drm/drm_crtc_helper.h>
	18	#include <drm/drm_fb_helper.h>
0519f9a1	19	#include <uapi/drm/exynos_drm.h>
1c248b7d	20
7db3eba6	21	#include "exynos_drm_drv.h"
1c248b7d	22	#include "exynos_drm_fb.h"
1c248b7d	23	#include "exynos_drm_gem.h"
0519f9a1	24	#include "exynos_drm_iommu.h"
1daa892c	25	#include "exynos_drm_encoder.h"
1c248b7d ID	26
	27	#define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
	28
	29	/*
	30	* exynos specific framebuffer structure.
	31	*
	32	* @fb: drm framebuffer obejct.
01ed8126	33	* @buf_cnt: a buffer count to drm framebuffer.
229d3534	34	* @exynos_gem_obj: array of exynos specific gem object containing a gem object.
1c248b7d ID	35	*/
	36	struct exynos_drm_fb {
	37	struct drm_framebuffer fb;
01ed8126	38	unsigned int buf_cnt;
229d3534	39	struct exynos_drm_gem_obj *exynos_gem_obj[MAX_FB_BUFFER];
1c248b7d ID	40	};
1c248b7d ID	41
0519f9a1 ID	42	static int check_fb_gem_memory_type(struct drm_device *drm_dev,
	43	struct exynos_drm_gem_obj *exynos_gem_obj)
	44	{
	45	unsigned int flags;
	46
	47	/*
	48	* if exynos drm driver supports iommu then framebuffer can use
	49	* all the buffer types.
	50	*/
	51	if (is_drm_iommu_supported(drm_dev))
	52	return 0;
	53
	54	flags = exynos_gem_obj->flags;
	55
	56	/*
	57	* without iommu support, not support physically non-continuous memory
	58	* for framebuffer.
	59	*/
	60	if (IS_NONCONTIG_BUFFER(flags)) {
	61	DRM_ERROR("cannot use this gem memory type for fb.\n");
	62	return -EINVAL;
	63	}
	64
	65	return 0;
	66	}
	67
1c248b7d ID	68	static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
	69	{
	70	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
07b6835f	71	unsigned int i;
1c248b7d	72
1daa892c ID	73	/* make sure that overlay data are updated before relesing fb. */
	74	exynos_drm_encoder_complete_scanout(fb);
	75
1c248b7d ID	76	drm_framebuffer_cleanup(fb);
1c248b7d ID	77
07b6835f LP	78	for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
	79	struct drm_gem_object *obj;
	80
	81	if (exynos_fb->exynos_gem_obj[i] == NULL)
	82	continue;
	83
	84	obj = &exynos_fb->exynos_gem_obj[i]->base;
	85	drm_gem_object_unreference_unlocked(obj);
	86	}
	87
1c248b7d ID	88	kfree(exynos_fb);
	89	exynos_fb = NULL;
	90	}
	91
	92	static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
	93	struct drm_file *file_priv,
	94	unsigned int *handle)
	95	{
	96	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
	97
b9ede277 ID	98	/* This fb should have only one gem object. */
	99	if (WARN_ON(exynos_fb->buf_cnt != 1))
	100	return -EINVAL;
	101
1c248b7d	102	return drm_gem_handle_create(file_priv,
229d3534	103	&exynos_fb->exynos_gem_obj[0]->base, handle);
1c248b7d ID	104	}
	105
	106	static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
	107	struct drm_file *file_priv, unsigned flags,
	108	unsigned color, struct drm_clip_rect *clips,
	109	unsigned num_clips)
	110	{
1c248b7d ID	111	/* TODO */
	112
	113	return 0;
	114	}
	115
	116	static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
	117	.destroy = exynos_drm_fb_destroy,
	118	.create_handle = exynos_drm_fb_create_handle,
	119	.dirty = exynos_drm_fb_dirty,
	120	};
	121
01ed8126 ID	122	void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
	123	unsigned int cnt)
	124	{
	125	struct exynos_drm_fb *exynos_fb;
	126
	127	exynos_fb = to_exynos_fb(fb);
	128
	129	exynos_fb->buf_cnt = cnt;
	130	}
	131
	132	unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
	133	{
	134	struct exynos_drm_fb *exynos_fb;
	135
	136	exynos_fb = to_exynos_fb(fb);
	137
	138	return exynos_fb->buf_cnt;
	139	}
	140
e1533c08 JS	141	struct drm_framebuffer *
	142	exynos_drm_framebuffer_init(struct drm_device *dev,
	143	struct drm_mode_fb_cmd2 *mode_cmd,
	144	struct drm_gem_object *obj)
1c248b7d ID	145	{
1c248b7d ID	146	struct exynos_drm_fb *exynos_fb;
0519f9a1	147	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	148	int ret;
1c248b7d ID	149
0519f9a1 ID	150	exynos_gem_obj = to_exynos_gem_obj(obj);
	151
	152	ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
	153	if (ret < 0) {
	154	DRM_ERROR("cannot use this gem memory type for fb.\n");
	155	return ERR_PTR(-EINVAL);
	156	}
	157
1c248b7d ID	158	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
1c248b7d ID	159	if (!exynos_fb) {
e1533c08	160	DRM_ERROR("failed to allocate exynos drm framebuffer\n");
1c248b7d ID	161	return ERR_PTR(-ENOMEM);
	162	}
	163
f2c0095a	164	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
0519f9a1 ID	165	exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
0519f9a1 ID	166
e1533c08	167	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
1c248b7d	168	if (ret) {
e1533c08 JS	169	DRM_ERROR("failed to initialize framebuffer\n");
e1533c08 JS	170	return ERR_PTR(ret);
1c248b7d ID	171	}
1c248b7d ID	172
e1533c08	173	return &exynos_fb->fb;
1c248b7d ID	174	}
1c248b7d ID	175
01ed8126 ID	176	static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
	177	{
	178	unsigned int cnt = 0;
	179
	180	if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
	181	return drm_format_num_planes(mode_cmd->pixel_format);
	182
	183	while (cnt != MAX_FB_BUFFER) {
	184	if (!mode_cmd->handles[cnt])
	185	break;
	186	cnt++;
	187	}
	188
	189	/*
	190	* check if NV12 or NV12M.
	191	*
	192	* NV12
	193	* handles[0] = base1, offsets[0] = 0
	194	* handles[1] = base1, offsets[1] = Y_size
	195	*
	196	* NV12M
	197	* handles[0] = base1, offsets[0] = 0
	198	* handles[1] = base2, offsets[1] = 0
	199	*/
	200	if (cnt == 2) {
	201	/*
	202	* in case of NV12 format, offsets[1] is not 0 and
	203	* handles[0] is same as handles[1].
	204	*/
	205	if (mode_cmd->offsets[1] &&
	206	mode_cmd->handles[0] == mode_cmd->handles[1])
	207	cnt = 1;
	208	}
	209
	210	return cnt;
	211	}
	212
e1533c08 JS	213	static struct drm_framebuffer *
	214	exynos_user_fb_create(struct drm_device dev, struct drm_file file_priv,
	215	struct drm_mode_fb_cmd2 *mode_cmd)
1c248b7d	216	{
e1533c08	217	struct drm_gem_object *obj;
979c0c7e	218	struct exynos_drm_gem_obj *exynos_gem_obj;
229d3534	219	struct exynos_drm_fb *exynos_fb;
f2c0095a	220	int i, ret;
e1533c08	221
f2c0095a DV	222	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
	223	if (!exynos_fb) {
	224	DRM_ERROR("failed to allocate exynos drm framebuffer\n");
	225	return ERR_PTR(-ENOMEM);
07b6835f	226	}
229d3534	227
979c0c7e YC	228	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
	229	if (!obj) {
	230	DRM_ERROR("failed to lookup gem object\n");
	231	ret = -ENOENT;
	232	goto err_free;
	233	}
	234
f2c0095a DV	235	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
f2c0095a DV	236	exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
01ed8126 ID	237	exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
	238
	239	DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
229d3534	240
01ed8126	241	for (i = 1; i < exynos_fb->buf_cnt; i++) {
229d3534 SWK	242	obj = drm_gem_object_lookup(dev, file_priv,
	243	mode_cmd->handles[i]);
	244	if (!obj) {
	245	DRM_ERROR("failed to lookup gem object\n");
979c0c7e YC	246	ret = -ENOENT;
	247	exynos_fb->buf_cnt = i;
	248	goto err_unreference;
229d3534 SWK	249	}
229d3534 SWK	250
0519f9a1	251	exynos_gem_obj = to_exynos_gem_obj(obj);
979c0c7e	252	exynos_fb->exynos_gem_obj[i] = exynos_gem_obj;
0519f9a1 ID	253
	254	ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
	255	if (ret < 0) {
	256	DRM_ERROR("cannot use this gem memory type for fb.\n");
979c0c7e	257	goto err_unreference;
0519f9a1	258	}
229d3534 SWK	259	}
229d3534 SWK	260
f2c0095a DV	261	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
f2c0095a DV	262	if (ret) {
979c0c7e YC	263	DRM_ERROR("failed to init framebuffer.\n");
979c0c7e YC	264	goto err_unreference;
f2c0095a DV	265	}
	266
	267	return &exynos_fb->fb;
979c0c7e YC	268
	269	err_unreference:
	270	for (i = 0; i < exynos_fb->buf_cnt; i++) {
	271	struct drm_gem_object *obj;
	272
	273	obj = &exynos_fb->exynos_gem_obj[i]->base;
	274	if (obj)
	275	drm_gem_object_unreference_unlocked(obj);
	276	}
	277	err_free:
	278	kfree(exynos_fb);
	279	return ERR_PTR(ret);
1c248b7d ID	280	}
1c248b7d ID	281
229d3534 SWK	282	struct exynos_drm_gem_buf exynos_drm_fb_buffer(struct drm_framebuffer fb,
229d3534 SWK	283	int index)
1c248b7d ID	284	{
1c248b7d ID	285	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
2c871127	286	struct exynos_drm_gem_buf *buffer;
1c248b7d	287
229d3534 SWK	288	if (index >= MAX_FB_BUFFER)
	289	return NULL;
	290
	291	buffer = exynos_fb->exynos_gem_obj[index]->buffer;
2c871127	292	if (!buffer)
19c8b834	293	return NULL;
1c248b7d	294
4744ad24	295	DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
1c248b7d	296
2c871127	297	return buffer;
1c248b7d ID	298	}
1c248b7d ID	299
7db3eba6 SWK	300	static void exynos_drm_output_poll_changed(struct drm_device *dev)
	301	{
	302	struct exynos_drm_private *private = dev->dev_private;
	303	struct drm_fb_helper *fb_helper = private->fb_helper;
	304
	305	if (fb_helper)
	306	drm_fb_helper_hotplug_event(fb_helper);
	307	}
	308
e6ecefaa	309	static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
e1533c08	310	.fb_create = exynos_user_fb_create,
7db3eba6	311	.output_poll_changed = exynos_drm_output_poll_changed,
1c248b7d ID	312	};
	313
	314	void exynos_drm_mode_config_init(struct drm_device *dev)
	315	{
	316	dev->mode_config.min_width = 0;
	317	dev->mode_config.min_height = 0;
	318
	319	/*
	320	* set max width and height as default value(4096x4096).
	321	* this value would be used to check framebuffer size limitation
	322	* at drm_mode_addfb().
	323	*/
	324	dev->mode_config.max_width = 4096;
	325	dev->mode_config.max_height = 4096;
	326
	327	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
	328	}