[mirror_ubuntu-bionic-kernel.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 <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>
#include <drm/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 int exynos_drm_fb_mmap(struct fb_info *info,
			struct vm_area_struct *vma)
{
	struct drm_fb_helper *helper = info->par;
	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
	unsigned long vm_size;
	int ret;

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

	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;

	vm_size = vma->vm_end - vma->vm_start;

	if (vm_size > buffer->size)
		return -EINVAL;

	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->kvaddr,
		buffer->dma_addr, buffer->size, &buffer->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	return 0;
}

static struct fb_ops exynos_drm_fb_ops = {
	.owner		= THIS_MODULE,
	.fb_mmap        = exynos_drm_fb_mmap,
	.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)
			(page_to_phys(sg_page(buffer->sgt->sgl)) + 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
760285e7 DH	29	#include <drm/drmP.h>
	30	#include <drm/drm_crtc.h>
	31	#include <drm/drm_fb_helper.h>
	32	#include <drm/drm_crtc_helper.h>
1c248b7d ID	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
dd265850 P	49	static int exynos_drm_fb_mmap(struct fb_info *info,
	50	struct vm_area_struct *vma)
	51	{
	52	struct drm_fb_helper *helper = info->par;
	53	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
	54	struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
	55	struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
	56	unsigned long vm_size;
	57	int ret;
	58
	59	DRM_DEBUG_KMS("%s\n", __func__);
	60
	61	vma->vm_flags \|= VM_IO \| VM_DONTEXPAND \| VM_DONTDUMP;
	62
	63	vm_size = vma->vm_end - vma->vm_start;
	64
	65	if (vm_size > buffer->size)
	66	return -EINVAL;
	67
	68	ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->kvaddr,
	69	buffer->dma_addr, buffer->size, &buffer->dma_attrs);
	70	if (ret < 0) {
	71	DRM_ERROR("failed to mmap.\n");
	72	return ret;
	73	}
	74
	75	return 0;
	76	}
	77
1c248b7d ID	78	static struct fb_ops exynos_drm_fb_ops = {
1c248b7d ID	79	.owner = THIS_MODULE,
dd265850	80	.fb_mmap = exynos_drm_fb_mmap,
1c248b7d ID	81	.fb_fillrect = cfb_fillrect,
	82	.fb_copyarea = cfb_copyarea,
	83	.fb_imageblit = cfb_imageblit,
	84	.fb_check_var = drm_fb_helper_check_var,
83b316fd	85	.fb_set_par = drm_fb_helper_set_par,
1c248b7d ID	86	.fb_blank = drm_fb_helper_blank,
	87	.fb_pan_display = drm_fb_helper_pan_display,
	88	.fb_setcmap = drm_fb_helper_setcmap,
	89	};
	90
19c8b834	91	static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
aa6b2b6c	92	struct drm_framebuffer *fb)
1c248b7d ID	93	{
	94	struct fb_info *fbi = helper->fbdev;
	95	struct drm_device *dev = helper->dev;
2c871127	96	struct exynos_drm_gem_buf *buffer;
aa6b2b6c	97	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
19c8b834	98	unsigned long offset;
1c248b7d ID	99
	100	DRM_DEBUG_KMS("%s\n", __FILE__);
	101
01f2c773	102	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
aa6b2b6c	103	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
1c248b7d	104
229d3534 SWK	105	/* RGB formats use only one buffer */
229d3534 SWK	106	buffer = exynos_drm_fb_buffer(fb, 0);
2c871127 ID	107	if (!buffer) {
2c871127 ID	108	DRM_LOG_KMS("buffer is null.\n");
19c8b834 ID	109	return -EFAULT;
19c8b834 ID	110	}
1c248b7d	111
01ed8126 ID	112	/* buffer count to framebuffer always is 1 at booting time. */
	113	exynos_drm_fb_set_buf_cnt(fb, 1);
	114
19c8b834	115	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
01f2c773	116	offset += fbi->var.yoffset * fb->pitches[0];
1c248b7d	117
2c871127 ID	118	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
2c871127 ID	119	fbi->screen_base = buffer->kvaddr + offset;
640631d0 P	120	fbi->fix.smem_start = (unsigned long)
640631d0 P	121	(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
1c248b7d	122	fbi->screen_size = size;
1c248b7d	123	fbi->fix.smem_len = size;
19c8b834 ID	124
19c8b834 ID	125	return 0;
1c248b7d ID	126	}
	127
	128	static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
	129	struct drm_fb_helper_surface_size *sizes)
	130	{
	131	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
e1533c08	132	struct exynos_drm_gem_obj *exynos_gem_obj;
1c248b7d ID	133	struct drm_device *dev = helper->dev;
1c248b7d ID	134	struct fb_info *fbi;
a794d57d	135	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
1c248b7d	136	struct platform_device *pdev = dev->platformdev;
e1533c08	137	unsigned long size;
1c248b7d ID	138	int ret;
	139
	140	DRM_DEBUG_KMS("%s\n", __FILE__);
	141
	142	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
	143	sizes->surface_width, sizes->surface_height,
	144	sizes->surface_bpp);
	145
	146	mode_cmd.width = sizes->surface_width;
	147	mode_cmd.height = sizes->surface_height;
a794d57d JS	148	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
	149	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	150	sizes->surface_depth);
1c248b7d ID	151
	152	mutex_lock(&dev->struct_mutex);
	153
	154	fbi = framebuffer_alloc(0, &pdev->dev);
	155	if (!fbi) {
	156	DRM_ERROR("failed to allocate fb info.\n");
	157	ret = -ENOMEM;
	158	goto out;
	159	}
	160
e1533c08	161	size = mode_cmd.pitches[0] * mode_cmd.height;
2b35892e ID	162
	163	/* 0 means to allocate physically continuous memory */
	164	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
e1533c08 JS	165	if (IS_ERR(exynos_gem_obj)) {
	166	ret = PTR_ERR(exynos_gem_obj);
	167	goto out;
	168	}
	169
	170	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
	171
	172	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
	173	&exynos_gem_obj->base);
	174	if (IS_ERR_OR_NULL(helper->fb)) {
1c248b7d	175	DRM_ERROR("failed to create drm framebuffer.\n");
e1533c08	176	ret = PTR_ERR(helper->fb);
1c248b7d ID	177	goto out;
	178	}
	179
1c248b7d ID	180	helper->fbdev = fbi;
	181
	182	fbi->par = helper;
	183	fbi->flags = FBINFO_FLAG_DEFAULT;
	184	fbi->fbops = &exynos_drm_fb_ops;
	185
	186	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
	187	if (ret) {
	188	DRM_ERROR("failed to allocate cmap.\n");
	189	goto out;
	190	}
	191
aa6b2b6c	192	ret = exynos_drm_fbdev_update(helper, helper->fb);
e1533c08	193	if (ret < 0) {
19c8b834	194	fb_dealloc_cmap(&fbi->cmap);
e1533c08 JS	195	goto out;
e1533c08 JS	196	}
1c248b7d ID	197
	198	/*
	199	* if failed, all resources allocated above would be released by
	200	* drm_mode_config_cleanup() when drm_load() had been called prior
	201	* to any specific driver such as fimd or hdmi driver.
	202	*/
	203	out:
	204	mutex_unlock(&dev->struct_mutex);
	205	return ret;
	206	}
	207
1c248b7d ID	208	static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
	209	struct drm_fb_helper_surface_size *sizes)
	210	{
	211	int ret = 0;
	212
	213	DRM_DEBUG_KMS("%s\n", __FILE__);
	214
bc41eae2 ID	215	/*
	216	* with !helper->fb, it means that this funcion is called first time
	217	* and after that, the helper->fb would be used as clone mode.
	218	*/
1c248b7d ID	219	if (!helper->fb) {
	220	ret = exynos_drm_fbdev_create(helper, sizes);
	221	if (ret < 0) {
	222	DRM_ERROR("failed to create fbdev.\n");
	223	return ret;
	224	}
	225
	226	/*
	227	* fb_helper expects a value more than 1 if succeed
	228	* because register_framebuffer() should be called.
	229	*/
	230	ret = 1;
1c248b7d ID	231	}
	232
	233	return ret;
	234	}
	235
	236	static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
	237	.fb_probe = exynos_drm_fbdev_probe,
	238	};
	239
	240	int exynos_drm_fbdev_init(struct drm_device *dev)
	241	{
	242	struct exynos_drm_fbdev *fbdev;
	243	struct exynos_drm_private *private = dev->dev_private;
	244	struct drm_fb_helper *helper;
	245	unsigned int num_crtc;
	246	int ret;
	247
	248	DRM_DEBUG_KMS("%s\n", __FILE__);
	249
	250	if (!dev->mode_config.num_crtc \|\| !dev->mode_config.num_connector)
	251	return 0;
	252
	253	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	254	if (!fbdev) {
	255	DRM_ERROR("failed to allocate drm fbdev.\n");
	256	return -ENOMEM;
	257	}
	258
	259	private->fb_helper = helper = &fbdev->drm_fb_helper;
	260	helper->funcs = &exynos_drm_fb_helper_funcs;
	261
	262	num_crtc = dev->mode_config.num_crtc;
	263
	264	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
	265	if (ret < 0) {
	266	DRM_ERROR("failed to initialize drm fb helper.\n");
	267	goto err_init;
	268	}
	269
	270	ret = drm_fb_helper_single_add_all_connectors(helper);
	271	if (ret < 0) {
	272	DRM_ERROR("failed to register drm_fb_helper_connector.\n");
	273	goto err_setup;
	274
	275	}
	276
	277	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
	278	if (ret < 0) {
	279	DRM_ERROR("failed to set up hw configuration.\n");
	280	goto err_setup;
	281	}
	282
	283	return 0;
	284
	285	err_setup:
	286	drm_fb_helper_fini(helper);
	287
	288	err_init:
	289	private->fb_helper = NULL;
	290	kfree(fbdev);
	291
	292	return ret;
	293	}
	294
295	static void exynos_drm_fbdev_destroy(struct drm_device *dev,
296	struct drm_fb_helper *fb_helper)
297	{
298	struct drm_framebuffer *fb;
299
300	/* release drm framebuffer and real buffer */
301	if (fb_helper->fb && fb_helper->fb->funcs) {
302	fb = fb_helper->fb;
f7eff60e RC	303	if (fb)
f7eff60e RC	304	drm_framebuffer_remove(fb);
1c248b7d ID	305	}
	306
	307	/* release linux framebuffer */
	308	if (fb_helper->fbdev) {
	309	struct fb_info *info;
	310	int ret;
	311
	312	info = fb_helper->fbdev;
	313	ret = unregister_framebuffer(info);
	314	if (ret < 0)
	315	DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
	316
	317	if (info->cmap.len)
	318	fb_dealloc_cmap(&info->cmap);
	319
	320	framebuffer_release(info);
	321	}
	322
	323	drm_fb_helper_fini(fb_helper);
	324	}
	325
	326	void exynos_drm_fbdev_fini(struct drm_device *dev)
	327	{
	328	struct exynos_drm_private *private = dev->dev_private;
	329	struct exynos_drm_fbdev *fbdev;
	330
	331	if (!private \|\| !private->fb_helper)
	332	return;
	333
	334	fbdev = to_exynos_fbdev(private->fb_helper);
	335
e1533c08 JS	336	if (fbdev->exynos_gem_obj)
	337	exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
	338
1c248b7d ID	339	exynos_drm_fbdev_destroy(dev, private->fb_helper);
	340	kfree(fbdev);
	341	private->fb_helper = NULL;
	342	}
	343
	344	void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
	345	{
	346	struct exynos_drm_private *private = dev->dev_private;
	347
	348	if (!private \|\| !private->fb_helper)
	349	return;
	350
	351	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
	352	}