[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / omapdrm / omap_fbdev.c

/*
 * drivers/gpu/drm/omapdrm/omap_fbdev.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <rob@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <drm/drm_crtc.h>
#include <drm/drm_fb_helper.h>

#include "omap_drv.h"

MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
static bool ywrap_enabled = true;
module_param_named(ywrap, ywrap_enabled, bool, 0644);

/*
 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
 */

#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)

struct omap_fbdev {
	struct drm_fb_helper base;
	struct drm_framebuffer *fb;
	struct drm_gem_object *bo;
	bool ywrap_enabled;

	/* for deferred dmm roll when getting called in atomic ctx */
	struct work_struct work;
};

static struct drm_fb_helper *get_fb(struct fb_info *fbi);

static void pan_worker(struct work_struct *work)
{
	struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
	struct fb_info *fbi = fbdev->base.fbdev;
	int npages;

	/* DMM roll shifts in 4K pages: */
	npages = fbi->fix.line_length >> PAGE_SHIFT;
	omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
}

static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
		struct fb_info *fbi)
{
	struct drm_fb_helper *helper = get_fb(fbi);
	struct omap_fbdev *fbdev = to_omap_fbdev(helper);

	if (!helper)
		goto fallback;

	if (!fbdev->ywrap_enabled)
		goto fallback;

	if (drm_can_sleep()) {
		pan_worker(&fbdev->work);
	} else {
		struct omap_drm_private *priv = helper->dev->dev_private;
		queue_work(priv->wq, &fbdev->work);
	}

	return 0;

fallback:
	return drm_fb_helper_pan_display(var, fbi);
}

static struct fb_ops omap_fb_ops = {
	.owner = THIS_MODULE,

	/* Note: to properly handle manual update displays, we wrap the
	 * basic fbdev ops which write to the framebuffer
	 */
	.fb_read = drm_fb_helper_sys_read,
	.fb_write = drm_fb_helper_sys_write,
	.fb_fillrect = drm_fb_helper_sys_fillrect,
	.fb_copyarea = drm_fb_helper_sys_copyarea,
	.fb_imageblit = drm_fb_helper_sys_imageblit,

	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par,
	.fb_pan_display = omap_fbdev_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
};

static int omap_fbdev_create(struct drm_fb_helper *helper,
		struct drm_fb_helper_surface_size *sizes)
{
	struct omap_fbdev *fbdev = to_omap_fbdev(helper);
	struct drm_device *dev = helper->dev;
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_framebuffer *fb = NULL;
	union omap_gem_size gsize;
	struct fb_info *fbi = NULL;
	struct drm_mode_fb_cmd2 mode_cmd = {0};
	dma_addr_t paddr;
	int ret;

	sizes->surface_bpp = 32;
	sizes->surface_depth = 24;

	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
			sizes->surface_height, sizes->surface_bpp,
			sizes->fb_width, sizes->fb_height);

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
			sizes->surface_depth);

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;

	mode_cmd.pitches[0] =
			DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);

	fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
	if (fbdev->ywrap_enabled) {
		/* need to align pitch to page size if using DMM scrolling */
		mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
	}

	/* allocate backing bo */
	gsize = (union omap_gem_size){
		.bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
	};
	DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
	fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
	if (!fbdev->bo) {
		dev_err(dev->dev, "failed to allocate buffer object\n");
		ret = -ENOMEM;
		goto fail;
	}

	fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
	if (IS_ERR(fb)) {
		dev_err(dev->dev, "failed to allocate fb\n");
		/* note: if fb creation failed, we can't rely on fb destroy
		 * to unref the bo:
		 */
		drm_gem_object_unreference_unlocked(fbdev->bo);
		ret = PTR_ERR(fb);
		goto fail;
	}

	/* note: this keeps the bo pinned.. which is perhaps not ideal,
	 * but is needed as long as we use fb_mmap() to mmap to userspace
	 * (since this happens using fix.smem_start).  Possibly we could
	 * implement our own mmap using GEM mmap support to avoid this
	 * (non-tiled buffer doesn't need to be pinned for fbcon to write
	 * to it).  Then we just need to be sure that we are able to re-
	 * pin it in case of an opps.
	 */
	ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
	if (ret) {
		dev_err(dev->dev,
			"could not map (paddr)!  Skipping framebuffer alloc\n");
		ret = -ENOMEM;
		goto fail;
	}

	mutex_lock(&dev->struct_mutex);

	fbi = drm_fb_helper_alloc_fbi(helper);
	if (IS_ERR(fbi)) {
		dev_err(dev->dev, "failed to allocate fb info\n");
		ret = PTR_ERR(fbi);
		goto fail_unlock;
	}

	DBG("fbi=%p, dev=%p", fbi, dev);

	fbdev->fb = fb;
	helper->fb = fb;

	fbi->par = helper;
	fbi->flags = FBINFO_DEFAULT;
	fbi->fbops = &omap_fb_ops;

	strcpy(fbi->fix.id, MODULE_NAME);

	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);

	dev->mode_config.fb_base = paddr;

	fbi->screen_base = omap_gem_vaddr(fbdev->bo);
	fbi->screen_size = fbdev->bo->size;
	fbi->fix.smem_start = paddr;
	fbi->fix.smem_len = fbdev->bo->size;

	/* if we have DMM, then we can use it for scrolling by just
	 * shuffling pages around in DMM rather than doing sw blit.
	 */
	if (fbdev->ywrap_enabled) {
		DRM_INFO("Enabling DMM ywrap scrolling\n");
		fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
		fbi->fix.ywrapstep = 1;
	}


	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);

	mutex_unlock(&dev->struct_mutex);

	return 0;

fail_unlock:
	mutex_unlock(&dev->struct_mutex);
fail:

	if (ret) {

		drm_fb_helper_release_fbi(helper);

		if (fb) {
			drm_framebuffer_unregister_private(fb);
			drm_framebuffer_remove(fb);
		}
	}

	return ret;
}

static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
	.fb_probe = omap_fbdev_create,
};

static struct drm_fb_helper *get_fb(struct fb_info *fbi)
{
	if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
		/* these are not the fb's you're looking for */
		return NULL;
	}
	return fbi->par;
}

/* initialize fbdev helper */
struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_fbdev *fbdev = NULL;
	struct drm_fb_helper *helper;
	int ret = 0;

	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
	if (!fbdev)
		goto fail;

	INIT_WORK(&fbdev->work, pan_worker);

	helper = &fbdev->base;

	drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);

	ret = drm_fb_helper_init(dev, helper,
			priv->num_crtcs, priv->num_connectors);
	if (ret) {
		dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
		goto fail;
	}

	ret = drm_fb_helper_single_add_all_connectors(helper);
	if (ret)
		goto fini;

	ret = drm_fb_helper_initial_config(helper, 32);
	if (ret)
		goto fini;

	priv->fbdev = helper;

	return helper;

fini:
	drm_fb_helper_fini(helper);
fail:
	kfree(fbdev);

	dev_warn(dev->dev, "omap_fbdev_init failed\n");
	/* well, limp along without an fbdev.. maybe X11 will work? */

	return NULL;
}

void omap_fbdev_free(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_fb_helper *helper = priv->fbdev;
	struct omap_fbdev *fbdev;

	DBG();

	drm_fb_helper_unregister_fbi(helper);
	drm_fb_helper_release_fbi(helper);

	drm_fb_helper_fini(helper);

	fbdev = to_omap_fbdev(priv->fbdev);

	/* release the ref taken in omap_fbdev_create() */
	omap_gem_put_paddr(fbdev->bo);

	/* this will free the backing object */
	if (fbdev->fb) {
		drm_framebuffer_unregister_private(fbdev->fb);
		drm_framebuffer_remove(fbdev->fb);
	}

	kfree(fbdev);

	priv->fbdev = NULL;
}
Commit	Line	Data
cd5351f4	1	/*
8bb0daff	2	* drivers/gpu/drm/omapdrm/omap_fbdev.c
cd5351f4 RC	3	*
	4	* Copyright (C) 2011 Texas Instruments
	5	* Author: Rob Clark <rob@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
2d278f54 LP	20	#include <drm/drm_crtc.h>
2d278f54 LP	21	#include <drm/drm_fb_helper.h>
cd5351f4	22
2d278f54	23	#include "omap_drv.h"
cd5351f4	24
510d4d32 RC	25	MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
	26	static bool ywrap_enabled = true;
	27	module_param_named(ywrap, ywrap_enabled, bool, 0644);
	28
cd5351f4 RC	29	/*
	30	* fbdev funcs, to implement legacy fbdev interface on top of drm driver
	31	*/
	32
	33	#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
	34
	35	struct omap_fbdev {
	36	struct drm_fb_helper base;
	37	struct drm_framebuffer *fb;
a6a91827	38	struct drm_gem_object *bo;
510d4d32	39	bool ywrap_enabled;
9b55b95a RC	40
	41	/* for deferred dmm roll when getting called in atomic ctx */
	42	struct work_struct work;
cd5351f4 RC	43	};
cd5351f4 RC	44
a6a91827	45	static struct drm_fb_helper get_fb(struct fb_info fbi);
cd5351f4	46
9b55b95a RC	47	static void pan_worker(struct work_struct *work)
	48	{
	49	struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
	50	struct fb_info *fbi = fbdev->base.fbdev;
	51	int npages;
	52
	53	/* DMM roll shifts in 4K pages: */
	54	npages = fbi->fix.line_length >> PAGE_SHIFT;
	55	omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
	56	}
	57
a6a91827 RC	58	static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
	59	struct fb_info *fbi)
	60	{
	61	struct drm_fb_helper *helper = get_fb(fbi);
	62	struct omap_fbdev *fbdev = to_omap_fbdev(helper);
a6a91827 RC	63
	64	if (!helper)
	65	goto fallback;
	66
510d4d32	67	if (!fbdev->ywrap_enabled)
a6a91827 RC	68	goto fallback;
a6a91827 RC	69
9b55b95a RC	70	if (drm_can_sleep()) {
	71	pan_worker(&fbdev->work);
	72	} else {
	73	struct omap_drm_private *priv = helper->dev->dev_private;
	74	queue_work(priv->wq, &fbdev->work);
	75	}
a6a91827 RC	76
	77	return 0;
	78
	79	fallback:
	80	return drm_fb_helper_pan_display(var, fbi);
	81	}
	82
cd5351f4 RC	83	static struct fb_ops omap_fb_ops = {
	84	.owner = THIS_MODULE,
	85
	86	/* Note: to properly handle manual update displays, we wrap the
	87	* basic fbdev ops which write to the framebuffer
	88	*/
231e6faf AT	89	.fb_read = drm_fb_helper_sys_read,
	90	.fb_write = drm_fb_helper_sys_write,
	91	.fb_fillrect = drm_fb_helper_sys_fillrect,
	92	.fb_copyarea = drm_fb_helper_sys_copyarea,
	93	.fb_imageblit = drm_fb_helper_sys_imageblit,
cd5351f4 RC	94
	95	.fb_check_var = drm_fb_helper_check_var,
	96	.fb_set_par = drm_fb_helper_set_par,
a6a91827	97	.fb_pan_display = omap_fbdev_pan_display,
cd5351f4 RC	98	.fb_blank = drm_fb_helper_blank,
cd5351f4 RC	99	.fb_setcmap = drm_fb_helper_setcmap,
cd5351f4 RC	100	};
	101
	102	static int omap_fbdev_create(struct drm_fb_helper *helper,
	103	struct drm_fb_helper_surface_size *sizes)
	104	{
	105	struct omap_fbdev *fbdev = to_omap_fbdev(helper);
	106	struct drm_device *dev = helper->dev;
a6a91827	107	struct omap_drm_private *priv = dev->dev_private;
cd5351f4	108	struct drm_framebuffer *fb = NULL;
a6a91827	109	union omap_gem_size gsize;
cd5351f4	110	struct fb_info *fbi = NULL;
ae43d7ca	111	struct drm_mode_fb_cmd2 mode_cmd = {0};
cd5351f4	112	dma_addr_t paddr;
cd5351f4 RC	113	int ret;
cd5351f4 RC	114
cd5351f4	115	sizes->surface_bpp = 32;
1d977b06	116	sizes->surface_depth = 24;
cd5351f4	117
a6a91827 RC	118	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
	119	sizes->surface_height, sizes->surface_bpp,
	120	sizes->fb_width, sizes->fb_height);
cd5351f4	121
ae43d7ca RC	122	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
	123	sizes->surface_depth);
	124
cd5351f4 RC	125	mode_cmd.width = sizes->surface_width;
	126	mode_cmd.height = sizes->surface_height;
	127
ce481eda TV	128	mode_cmd.pitches[0] =
ce481eda TV	129	DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
a6a91827	130
510d4d32 RC	131	fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
510d4d32 RC	132	if (fbdev->ywrap_enabled) {
a6a91827	133	/* need to align pitch to page size if using DMM scrolling */
743c1671	134	mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
a6a91827 RC	135	}
	136
	137	/* allocate backing bo */
	138	gsize = (union omap_gem_size){
ae43d7ca	139	.bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
a6a91827 RC	140	};
	141	DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
	142	fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT \| OMAP_BO_WC);
	143	if (!fbdev->bo) {
	144	dev_err(dev->dev, "failed to allocate buffer object\n");
ae43d7ca	145	ret = -ENOMEM;
a6a91827 RC	146	goto fail;
	147	}
	148
ae43d7ca RC	149	fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
ae43d7ca RC	150	if (IS_ERR(fb)) {
cd5351f4	151	dev_err(dev->dev, "failed to allocate fb\n");
ae43d7ca RC	152	/* note: if fb creation failed, we can't rely on fb destroy
	153	* to unref the bo:
	154	*/
5bb682c4	155	drm_gem_object_unreference_unlocked(fbdev->bo);
ae43d7ca RC	156	ret = PTR_ERR(fb);
	157	goto fail;
	158	}
	159
	160	/* note: this keeps the bo pinned.. which is perhaps not ideal,
	161	* but is needed as long as we use fb_mmap() to mmap to userspace
	162	* (since this happens using fix.smem_start). Possibly we could
	163	* implement our own mmap using GEM mmap support to avoid this
	164	* (non-tiled buffer doesn't need to be pinned for fbcon to write
	165	* to it). Then we just need to be sure that we are able to re-
	166	* pin it in case of an opps.
	167	*/
	168	ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
	169	if (ret) {
afb6a6a0 AG	170	dev_err(dev->dev,
afb6a6a0 AG	171	"could not map (paddr)! Skipping framebuffer alloc\n");
cd5351f4 RC	172	ret = -ENOMEM;
	173	goto fail;
	174	}
	175
	176	mutex_lock(&dev->struct_mutex);
	177
231e6faf AT	178	fbi = drm_fb_helper_alloc_fbi(helper);
231e6faf AT	179	if (IS_ERR(fbi)) {
cd5351f4	180	dev_err(dev->dev, "failed to allocate fb info\n");
231e6faf	181	ret = PTR_ERR(fbi);
cd5351f4 RC	182	goto fail_unlock;
	183	}
	184
	185	DBG("fbi=%p, dev=%p", fbi, dev);
	186
	187	fbdev->fb = fb;
	188	helper->fb = fb;
cd5351f4 RC	189
	190	fbi->par = helper;
	191	fbi->flags = FBINFO_DEFAULT;
	192	fbi->fbops = &omap_fb_ops;
	193
	194	strcpy(fbi->fix.id, MODULE_NAME);
	195
ae43d7ca	196	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
a6a91827	197	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
cd5351f4	198
cd5351f4 RC	199	dev->mode_config.fb_base = paddr;
cd5351f4 RC	200
ae43d7ca RC	201	fbi->screen_base = omap_gem_vaddr(fbdev->bo);
ae43d7ca RC	202	fbi->screen_size = fbdev->bo->size;
cd5351f4	203	fbi->fix.smem_start = paddr;
ae43d7ca	204	fbi->fix.smem_len = fbdev->bo->size;
cd5351f4	205
a6a91827 RC	206	/* if we have DMM, then we can use it for scrolling by just
	207	* shuffling pages around in DMM rather than doing sw blit.
	208	*/
510d4d32	209	if (fbdev->ywrap_enabled) {
a6a91827 RC	210	DRM_INFO("Enabling DMM ywrap scrolling\n");
	211	fbi->flags \|= FBINFO_HWACCEL_YWRAP \| FBINFO_READS_FAST;
	212	fbi->fix.ywrapstep = 1;
	213	}
	214
510d4d32	215
cd5351f4 RC	216	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
	217	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
	218
	219	mutex_unlock(&dev->struct_mutex);
	220
	221	return 0;
	222
	223	fail_unlock:
	224	mutex_unlock(&dev->struct_mutex);
	225	fail:
	226
	227	if (ret) {
231e6faf AT	228
	229	drm_fb_helper_release_fbi(helper);
	230
36206361 DV	231	if (fb) {
36206361 DV	232	drm_framebuffer_unregister_private(fb);
f7eff60e	233	drm_framebuffer_remove(fb);
36206361	234	}
cd5351f4 RC	235	}
	236
	237	return ret;
	238	}
	239
3a493879	240	static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
cd5428a5	241	.fb_probe = omap_fbdev_create,
cd5351f4 RC	242	};
	243
	244	static struct drm_fb_helper get_fb(struct fb_info fbi)
	245	{
	246	if (!fbi \|\| strcmp(fbi->fix.id, MODULE_NAME)) {
	247	/* these are not the fb's you're looking for */
	248	return NULL;
	249	}
	250	return fbi->par;
	251	}
	252
cd5351f4 RC	253	/* initialize fbdev helper */
	254	struct drm_fb_helper omap_fbdev_init(struct drm_device dev)
	255	{
	256	struct omap_drm_private *priv = dev->dev_private;
	257	struct omap_fbdev *fbdev = NULL;
	258	struct drm_fb_helper *helper;
	259	int ret = 0;
	260
	261	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
78110bb8	262	if (!fbdev)
cd5351f4	263	goto fail;
cd5351f4	264
9b55b95a RC	265	INIT_WORK(&fbdev->work, pan_worker);
9b55b95a RC	266
cd5351f4 RC	267	helper = &fbdev->base;
cd5351f4 RC	268
10a23102	269	drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
cd5351f4 RC	270
	271	ret = drm_fb_helper_init(dev, helper,
	272	priv->num_crtcs, priv->num_connectors);
	273	if (ret) {
	274	dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
	275	goto fail;
	276	}
	277
01934c2a TR	278	ret = drm_fb_helper_single_add_all_connectors(helper);
	279	if (ret)
	280	goto fini;
76a39dbf	281
01934c2a TR	282	ret = drm_fb_helper_initial_config(helper, 32);
	283	if (ret)
	284	goto fini;
cd5351f4 RC	285
	286	priv->fbdev = helper;
	287
	288	return helper;
	289
01934c2a TR	290	fini:
01934c2a TR	291	drm_fb_helper_fini(helper);
cd5351f4 RC	292	fail:
cd5351f4 RC	293	kfree(fbdev);
e1c1174f LP	294
	295	dev_warn(dev->dev, "omap_fbdev_init failed\n");
	296	/* well, limp along without an fbdev.. maybe X11 will work? */
	297
cd5351f4 RC	298	return NULL;
	299	}
	300
	301	void omap_fbdev_free(struct drm_device *dev)
	302	{
	303	struct omap_drm_private *priv = dev->dev_private;
	304	struct drm_fb_helper *helper = priv->fbdev;
	305	struct omap_fbdev *fbdev;
cd5351f4 RC	306
	307	DBG();
	308
231e6faf AT	309	drm_fb_helper_unregister_fbi(helper);
231e6faf AT	310	drm_fb_helper_release_fbi(helper);
cd5351f4 RC	311
	312	drm_fb_helper_fini(helper);
	313
	314	fbdev = to_omap_fbdev(priv->fbdev);
	315
5e19c06d TV	316	/* release the ref taken in omap_fbdev_create() */
	317	omap_gem_put_paddr(fbdev->bo);
	318
a6a91827	319	/* this will free the backing object */
36206361 DV	320	if (fbdev->fb) {
36206361 DV	321	drm_framebuffer_unregister_private(fbdev->fb);
f7eff60e	322	drm_framebuffer_remove(fbdev->fb);
36206361	323	}
a6a91827	324
a9e8d70c JL	325	kfree(fbdev);
a9e8d70c JL	326
cd5351f4 RC	327	priv->fbdev = NULL;
cd5351f4 RC	328	}