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

/* 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"

#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 exynos_drm_gem_obj	*exynos_gem_obj;
};

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	= drm_fb_helper_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_gem_buf *buffer;
	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
	unsigned long offset;

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

	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);

	/* RGB formats use only one buffer */
	buffer = exynos_drm_fb_buffer(fb, 0);
	if (!buffer) {
		DRM_LOG_KMS("buffer is null.\n");
		return -EFAULT;
	}

	/* buffer count to framebuffer always is 1 at booting time. */
	exynos_drm_fb_set_buf_cnt(fb, 1);

	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
	offset += fbi->var.yoffset * fb->pitches[0];

	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 exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_device *dev = helper->dev;
	struct fb_info *fbi;
	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
	struct platform_device *pdev = dev->platformdev;
	unsigned long size;
	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.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  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;
	}

	size = mode_cmd.pitches[0] * mode_cmd.height;

	/* 0 means to allocate physically continuous memory */
	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
	if (IS_ERR(exynos_gem_obj)) {
		ret = PTR_ERR(exynos_gem_obj);
		goto out;
	}

	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;

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

	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);
		goto out;
	}

/*
 * 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 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__);

	/*
	 * with !helper->fb, it means that this funcion is called first time
	 * and after that, the helper->fb would be used as clone mode.
	 */
	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;
	}

	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)
			drm_framebuffer_remove(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);

	if (fbdev->exynos_gem_obj)
		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);

	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);
}
Commit	Line	Data
1c248b7d ID	1	/* exynos_drm_fbdev.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	*
	9	* Permission is hereby granted, free of charge, to any person obtaining a
	10	* copy of this software and associated documentation files (the "Software"),
	11	* to deal in the Software without restriction, including without limitation
	12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	13	* and/or sell copies of the Software, and to permit persons to whom the
	14	* Software is furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice (including the next
	17	* paragraph) shall be included in all copies or substantial portions of the
	18	* Software.
	19	*
	20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	21	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	23	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	24	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	25	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	26	* OTHER DEALINGS IN THE SOFTWARE.
	27	*/
	28
	29	#include "drmP.h"
	30	#include "drm_crtc.h"
	31	#include "drm_fb_helper.h"
	32	#include "drm_crtc_helper.h"
	33
	34	#include "exynos_drm_drv.h"
	35	#include "exynos_drm_fb.h"
2c871127	36	#include "exynos_drm_gem.h"
1c248b7d ID	37
	38	#define MAX_CONNECTOR 4
	39	#define PREFERRED_BPP 32
	40
	41	#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
	42	drm_fb_helper)
	43
	44	struct exynos_drm_fbdev {
e1533c08 JS	45	struct drm_fb_helper drm_fb_helper;
e1533c08 JS	46	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	47	};
1c248b7d ID	48
1c248b7d ID	49	static struct fb_ops exynos_drm_fb_ops = {
	50	.owner = THIS_MODULE,
	51	.fb_fillrect = cfb_fillrect,
	52	.fb_copyarea = cfb_copyarea,
	53	.fb_imageblit = cfb_imageblit,
	54	.fb_check_var = drm_fb_helper_check_var,
83b316fd	55	.fb_set_par = drm_fb_helper_set_par,
1c248b7d ID	56	.fb_blank = drm_fb_helper_blank,
	57	.fb_pan_display = drm_fb_helper_pan_display,
	58	.fb_setcmap = drm_fb_helper_setcmap,
	59	};
	60
19c8b834	61	static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
aa6b2b6c	62	struct drm_framebuffer *fb)
1c248b7d ID	63	{
	64	struct fb_info *fbi = helper->fbdev;
	65	struct drm_device *dev = helper->dev;
2c871127	66	struct exynos_drm_gem_buf *buffer;
aa6b2b6c	67	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
19c8b834	68	unsigned long offset;
1c248b7d ID	69
	70	DRM_DEBUG_KMS("%s\n", __FILE__);
	71
01f2c773	72	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
aa6b2b6c	73	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
1c248b7d	74
229d3534 SWK	75	/* RGB formats use only one buffer */
229d3534 SWK	76	buffer = exynos_drm_fb_buffer(fb, 0);
2c871127 ID	77	if (!buffer) {
2c871127 ID	78	DRM_LOG_KMS("buffer is null.\n");
19c8b834 ID	79	return -EFAULT;
19c8b834 ID	80	}
1c248b7d	81
01ed8126 ID	82	/* buffer count to framebuffer always is 1 at booting time. */
	83	exynos_drm_fb_set_buf_cnt(fb, 1);
	84
19c8b834	85	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
01f2c773	86	offset += fbi->var.yoffset * fb->pitches[0];
1c248b7d	87
2c871127 ID	88	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
	89	fbi->screen_base = buffer->kvaddr + offset;
	90	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
1c248b7d	91	fbi->screen_size = size;
1c248b7d	92	fbi->fix.smem_len = size;
19c8b834 ID	93
19c8b834 ID	94	return 0;
1c248b7d ID	95	}
	96
	97	static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
	98	struct drm_fb_helper_surface_size *sizes)
	99	{
	100	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
e1533c08	101	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	102	struct drm_device *dev = helper->dev;
1c248b7d ID	103	struct fb_info *fbi;
a794d57d	104	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d	105	struct platform_device *pdev = dev->platformdev;
e1533c08	106	unsigned long size;
1c248b7d ID	107	int ret;
	108
	109	DRM_DEBUG_KMS("%s\n", __FILE__);
	110
	111	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
	112	sizes->surface_width, sizes->surface_height,
	113	sizes->surface_bpp);
	114
	115	mode_cmd.width = sizes->surface_width;
	116	mode_cmd.height = sizes->surface_height;
a794d57d JS	117	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	118	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	119	sizes->surface_depth);
1c248b7d ID	120
	121	mutex_lock(&dev->struct_mutex);
	122
	123	fbi = framebuffer_alloc(0, &pdev->dev);
	124	if (!fbi) {
	125	DRM_ERROR("failed to allocate fb info.\n");
	126	ret = -ENOMEM;
	127	goto out;
	128	}
	129
e1533c08	130	size = mode_cmd.pitches[0] * mode_cmd.height;
2b35892e ID	131
	132	/* 0 means to allocate physically continuous memory */
	133	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
e1533c08 JS	134	if (IS_ERR(exynos_gem_obj)) {
	135	ret = PTR_ERR(exynos_gem_obj);
	136	goto out;
	137	}
	138
	139	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
	140
	141	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
	142	&exynos_gem_obj->base);
	143	if (IS_ERR_OR_NULL(helper->fb)) {
1c248b7d	144	DRM_ERROR("failed to create drm framebuffer.\n");
e1533c08	145	ret = PTR_ERR(helper->fb);
1c248b7d ID	146	goto out;
	147	}
	148
1c248b7d ID	149	helper->fbdev = fbi;
	150
	151	fbi->par = helper;
	152	fbi->flags = FBINFO_FLAG_DEFAULT;
	153	fbi->fbops = &exynos_drm_fb_ops;
	154
	155	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	156	if (ret) {
	157	DRM_ERROR("failed to allocate cmap.\n");
	158	goto out;
	159	}
	160
aa6b2b6c	161	ret = exynos_drm_fbdev_update(helper, helper->fb);
e1533c08	162	if (ret < 0) {
19c8b834	163	fb_dealloc_cmap(&fbi->cmap);
e1533c08 JS	164	goto out;
e1533c08 JS	165	}
1c248b7d ID	166
	167	/*
	168	* if failed, all resources allocated above would be released by
	169	* drm_mode_config_cleanup() when drm_load() had been called prior
	170	* to any specific driver such as fimd or hdmi driver.
	171	*/
	172	out:
	173	mutex_unlock(&dev->struct_mutex);
	174	return ret;
	175	}
	176
1c248b7d ID	177	static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
	178	struct drm_fb_helper_surface_size *sizes)
	179	{
	180	int ret = 0;
	181
	182	DRM_DEBUG_KMS("%s\n", __FILE__);
	183
bc41eae2 ID	184	/*
	185	* with !helper->fb, it means that this funcion is called first time
	186	* and after that, the helper->fb would be used as clone mode.
	187	*/
1c248b7d ID	188	if (!helper->fb) {
	189	ret = exynos_drm_fbdev_create(helper, sizes);
	190	if (ret < 0) {
	191	DRM_ERROR("failed to create fbdev.\n");
	192	return ret;
	193	}
	194
	195	/*
	196	* fb_helper expects a value more than 1 if succeed
	197	* because register_framebuffer() should be called.
	198	*/
	199	ret = 1;
1c248b7d ID	200	}
	201
	202	return ret;
	203	}
	204
	205	static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	206	.fb_probe = exynos_drm_fbdev_probe,
	207	};
	208
	209	int exynos_drm_fbdev_init(struct drm_device *dev)
	210	{
	211	struct exynos_drm_fbdev *fbdev;
	212	struct exynos_drm_private *private = dev->dev_private;
	213	struct drm_fb_helper *helper;
	214	unsigned int num_crtc;
	215	int ret;
	216
	217	DRM_DEBUG_KMS("%s\n", __FILE__);
	218
	219	if (!dev->mode_config.num_crtc \|\| !dev->mode_config.num_connector)
	220	return 0;
	221
	222	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	223	if (!fbdev) {
	224	DRM_ERROR("failed to allocate drm fbdev.\n");
	225	return -ENOMEM;
	226	}
	227
	228	private->fb_helper = helper = &fbdev->drm_fb_helper;
	229	helper->funcs = &exynos_drm_fb_helper_funcs;
	230
	231	num_crtc = dev->mode_config.num_crtc;
	232
	233	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	234	if (ret < 0) {
	235	DRM_ERROR("failed to initialize drm fb helper.\n");
	236	goto err_init;
	237	}
	238
	239	ret = drm_fb_helper_single_add_all_connectors(helper);
	240	if (ret < 0) {
	241	DRM_ERROR("failed to register drm_fb_helper_connector.\n");
	242	goto err_setup;
	243
	244	}
	245
	246	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	247	if (ret < 0) {
	248	DRM_ERROR("failed to set up hw configuration.\n");
	249	goto err_setup;
	250	}
	251
	252	return 0;
	253
	254	err_setup:
	255	drm_fb_helper_fini(helper);
	256
	257	err_init:
	258	private->fb_helper = NULL;
	259	kfree(fbdev);
	260
	261	return ret;
	262	}
	263
264	static void exynos_drm_fbdev_destroy(struct drm_device *dev,
265	struct drm_fb_helper *fb_helper)
266	{
267	struct drm_framebuffer *fb;
268
269	/* release drm framebuffer and real buffer */
270	if (fb_helper->fb && fb_helper->fb->funcs) {
271	fb = fb_helper->fb;
f7eff60e RC	272	if (fb)
f7eff60e RC	273	drm_framebuffer_remove(fb);
1c248b7d ID	274	}
	275
	276	/* release linux framebuffer */
	277	if (fb_helper->fbdev) {
	278	struct fb_info *info;
	279	int ret;
	280
	281	info = fb_helper->fbdev;
	282	ret = unregister_framebuffer(info);
	283	if (ret < 0)
	284	DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
	285
	286	if (info->cmap.len)
	287	fb_dealloc_cmap(&info->cmap);
	288
	289	framebuffer_release(info);
	290	}
	291
	292	drm_fb_helper_fini(fb_helper);
	293	}
	294
	295	void exynos_drm_fbdev_fini(struct drm_device *dev)
	296	{
	297	struct exynos_drm_private *private = dev->dev_private;
	298	struct exynos_drm_fbdev *fbdev;
	299
	300	if (!private \|\| !private->fb_helper)
	301	return;
	302
	303	fbdev = to_exynos_fbdev(private->fb_helper);
	304
e1533c08 JS	305	if (fbdev->exynos_gem_obj)
	306	exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
	307
1c248b7d ID	308	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	309	kfree(fbdev);
	310	private->fb_helper = NULL;
	311	}
	312
	313	void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
	314	{
	315	struct exynos_drm_private *private = dev->dev_private;
	316
	317	if (!private \|\| !private->fb_helper)
	318	return;
	319
	320	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
	321	}