drivers/media/platform/omap/omap_voutlib.c - linux - Git at Google

 /*
  * omap_voutlib.c
  *
  * Copyright (C) 2005-2010 Texas Instruments.
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2. This program is licensed "as is" without any warranty of any
  * kind, whether express or implied.
  *
  * Based on the OMAP2 camera driver
  * Video-for-Linux (Version 2) camera capture driver for
  * the OMAP24xx camera controller.
  *
  * Author: Andy Lowe (source@mvista.com)
  *
  * Copyright (C) 2004 MontaVista Software, Inc.
  * Copyright (C) 2010 Texas Instruments.
  *
  */

 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/videodev2.h>

 #include <linux/dma-mapping.h>

 #include <video/omapfb_dss.h>

 #include "omap_voutlib.h"

 MODULE_AUTHOR("Texas Instruments");
 MODULE_DESCRIPTION("OMAP Video library");
 MODULE_LICENSE("GPL");

 /* Return the default overlay cropping rectangle in crop given the image
  * size in pix and the video display size in fbuf.  The default
  * cropping rectangle is the largest rectangle no larger than the capture size
  * that will fit on the display.  The default cropping rectangle is centered in
  * the image.  All dimensions and offsets are rounded down to even numbers.
  */
 void omap_vout_default_crop(struct v4l2_pix_format *pix,
 		  struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop)
 {
 	crop->width = (pix->width < fbuf->fmt.width) ?
 		pix->width : fbuf->fmt.width;
 	crop->height = (pix->height < fbuf->fmt.height) ?
 		pix->height : fbuf->fmt.height;
 	crop->width &= ~1;
 	crop->height &= ~1;
 	crop->left = ((pix->width - crop->width) >> 1) & ~1;
 	crop->top = ((pix->height - crop->height) >> 1) & ~1;
 }
 EXPORT_SYMBOL_GPL(omap_vout_default_crop);

 /* Given a new render window in new_win, adjust the window to the
  * nearest supported configuration.  The adjusted window parameters are
  * returned in new_win.
  * Returns zero if successful, or -EINVAL if the requested window is
  * impossible and cannot reasonably be adjusted.
  */
 int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
 			struct v4l2_window *new_win)
 {
 	struct v4l2_rect try_win;

 	/* make a working copy of the new_win rectangle */
 	try_win = new_win->w;

 	/* adjust the preview window so it fits on the display by clipping any
 	 * offscreen areas
 	 */
 	if (try_win.left < 0) {
 		try_win.width += try_win.left;
 		try_win.left = 0;
 	}
 	if (try_win.top < 0) {
 		try_win.height += try_win.top;
 		try_win.top = 0;
 	}
 	try_win.width = (try_win.width < fbuf->fmt.width) ?
 		try_win.width : fbuf->fmt.width;
 	try_win.height = (try_win.height < fbuf->fmt.height) ?
 		try_win.height : fbuf->fmt.height;
 	if (try_win.left + try_win.width > fbuf->fmt.width)
 		try_win.width = fbuf->fmt.width - try_win.left;
 	if (try_win.top + try_win.height > fbuf->fmt.height)
 		try_win.height = fbuf->fmt.height - try_win.top;
 	try_win.width &= ~1;
 	try_win.height &= ~1;

 	if (try_win.width <= 0 || try_win.height <= 0)
 		return -EINVAL;

 	/* We now have a valid preview window, so go with it */
 	new_win->w = try_win;
 	new_win->field = V4L2_FIELD_ANY;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_vout_try_window);

 /* Given a new render window in new_win, adjust the window to the
  * nearest supported configuration.  The image cropping window in crop
  * will also be adjusted if necessary.  Preference is given to keeping the
  * the window as close to the requested configuration as possible.  If
  * successful, new_win, vout->win, and crop are updated.
  * Returns zero if successful, or -EINVAL if the requested preview window is
  * impossible and cannot reasonably be adjusted.
  */
 int omap_vout_new_window(struct v4l2_rect *crop,
 		struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
 		struct v4l2_window *new_win)
 {
 	int err;

 	err = omap_vout_try_window(fbuf, new_win);
 	if (err)
 		return err;

 	/* update our preview window */
 	win->w = new_win->w;
 	win->field = new_win->field;
 	win->chromakey = new_win->chromakey;

 	/* Adjust the cropping window to allow for resizing limitation */
 	if (omap_vout_dss_omap24xx()) {
 		/* For 24xx limit is 8x to 1/2x scaling. */
 		if ((crop->height/win->w.height) >= 2)
 			crop->height = win->w.height * 2;

 		if ((crop->width/win->w.width) >= 2)
 			crop->width = win->w.width * 2;

 		if (crop->width > 768) {
 			/* The OMAP2420 vertical resizing line buffer is 768
 			 * pixels wide. If the cropped image is wider than
 			 * 768 pixels then it cannot be vertically resized.
 			 */
 			if (crop->height != win->w.height)
 				crop->width = 768;
 		}
 	} else if (omap_vout_dss_omap34xx()) {
 		/* For 34xx limit is 8x to 1/4x scaling. */
 		if ((crop->height/win->w.height) >= 4)
 			crop->height = win->w.height * 4;

 		if ((crop->width/win->w.width) >= 4)
 			crop->width = win->w.width * 4;
 	}
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_vout_new_window);

 /* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
  * the nearest supported configuration.  The image render window in win will
  * also be adjusted if necessary.  The preview window is adjusted such that the
  * horizontal and vertical rescaling ratios stay constant.  If the render
  * window would fall outside the display boundaries, the cropping rectangle
  * will also be adjusted to maintain the rescaling ratios.  If successful, crop
  * and win are updated.
  * Returns zero if successful, or -EINVAL if the requested cropping rectangle is
  * impossible and cannot reasonably be adjusted.
  */
 int omap_vout_new_crop(struct v4l2_pix_format *pix,
 	      struct v4l2_rect *crop, struct v4l2_window *win,
 	      struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
 {
 	struct v4l2_rect try_crop;
 	unsigned long vresize, hresize;

 	/* make a working copy of the new_crop rectangle */
 	try_crop = *new_crop;

 	/* adjust the cropping rectangle so it fits in the image */
 	if (try_crop.left < 0) {
 		try_crop.width += try_crop.left;
 		try_crop.left = 0;
 	}
 	if (try_crop.top < 0) {
 		try_crop.height += try_crop.top;
 		try_crop.top = 0;
 	}
 	try_crop.width = (try_crop.width < pix->width) ?
 		try_crop.width : pix->width;
 	try_crop.height = (try_crop.height < pix->height) ?
 		try_crop.height : pix->height;
 	if (try_crop.left + try_crop.width > pix->width)
 		try_crop.width = pix->width - try_crop.left;
 	if (try_crop.top + try_crop.height > pix->height)
 		try_crop.height = pix->height - try_crop.top;

 	try_crop.width &= ~1;
 	try_crop.height &= ~1;

 	if (try_crop.width <= 0 || try_crop.height <= 0)
 		return -EINVAL;

 	if (omap_vout_dss_omap24xx()) {
 		if (try_crop.height != win->w.height) {
 			/* If we're resizing vertically, we can't support a
 			 * crop width wider than 768 pixels.
 			 */
 			if (try_crop.width > 768)
 				try_crop.width = 768;
 		}
 	}
 	/* vertical resizing */
 	vresize = (1024 * try_crop.height) / win->w.height;
 	if (omap_vout_dss_omap24xx() && (vresize > 2048))
 		vresize = 2048;
 	else if (omap_vout_dss_omap34xx() && (vresize > 4096))
 		vresize = 4096;

 	win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
 	if (win->w.height == 0)
 		win->w.height = 2;
 	if (win->w.height + win->w.top > fbuf->fmt.height) {
 		/* We made the preview window extend below the bottom of the
 		 * display, so clip it to the display boundary and resize the
 		 * cropping height to maintain the vertical resizing ratio.
 		 */
 		win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
 		if (try_crop.height == 0)
 			try_crop.height = 2;
 	}
 	/* horizontal resizing */
 	hresize = (1024 * try_crop.width) / win->w.width;
 	if (omap_vout_dss_omap24xx() && (hresize > 2048))
 		hresize = 2048;
 	else if (omap_vout_dss_omap34xx() && (hresize > 4096))
 		hresize = 4096;

 	win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
 	if (win->w.width == 0)
 		win->w.width = 2;
 	if (win->w.width + win->w.left > fbuf->fmt.width) {
 		/* We made the preview window extend past the right side of the
 		 * display, so clip it to the display boundary and resize the
 		 * cropping width to maintain the horizontal resizing ratio.
 		 */
 		win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
 		if (try_crop.width == 0)
 			try_crop.width = 2;
 	}
 	if (omap_vout_dss_omap24xx()) {
 		if ((try_crop.height/win->w.height) >= 2)
 			try_crop.height = win->w.height * 2;

 		if ((try_crop.width/win->w.width) >= 2)
 			try_crop.width = win->w.width * 2;

 		if (try_crop.width > 768) {
 			/* The OMAP2420 vertical resizing line buffer is
 			 * 768 pixels wide.  If the cropped image is wider
 			 * than 768 pixels then it cannot be vertically resized.
 			 */
 			if (try_crop.height != win->w.height)
 				try_crop.width = 768;
 		}
 	} else if (omap_vout_dss_omap34xx()) {
 		if ((try_crop.height/win->w.height) >= 4)
 			try_crop.height = win->w.height * 4;

 		if ((try_crop.width/win->w.width) >= 4)
 			try_crop.width = win->w.width * 4;
 	}
 	/* update our cropping rectangle and we're done */
 	*crop = try_crop;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_vout_new_crop);

 /* Given a new format in pix and fbuf,  crop and win
  * structures are initialized to default values. crop
  * is initialized to the largest window size that will fit on the display.  The
  * crop window is centered in the image. win is initialized to
  * the same size as crop and is centered on the display.
  * All sizes and offsets are constrained to be even numbers.
  */
 void omap_vout_new_format(struct v4l2_pix_format *pix,
 		struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
 		struct v4l2_window *win)
 {
 	/* crop defines the preview source window in the image capture
 	 * buffer
 	 */
 	omap_vout_default_crop(pix, fbuf, crop);

 	/* win defines the preview target window on the display */
 	win->w.width = crop->width;
 	win->w.height = crop->height;
 	win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
 	win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
 }
 EXPORT_SYMBOL_GPL(omap_vout_new_format);

 /*
  * Allocate buffers
  */
 unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
 {
 	u32 order, size;
 	unsigned long virt_addr, addr;

 	size = PAGE_ALIGN(buf_size);
 	order = get_order(size);
 	virt_addr = __get_free_pages(GFP_KERNEL, order);
 	addr = virt_addr;

 	if (virt_addr) {
 		while (size > 0) {
 			SetPageReserved(virt_to_page(addr));
 			addr += PAGE_SIZE;
 			size -= PAGE_SIZE;
 		}
 	}
 	*phys_addr = (u32) virt_to_phys((void *) virt_addr);
 	return virt_addr;
 }

 /*
  * Free buffers
  */
 void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
 {
 	u32 order, size;
 	unsigned long addr = virtaddr;

 	size = PAGE_ALIGN(buf_size);
 	order = get_order(size);

 	while (size > 0) {
 		ClearPageReserved(virt_to_page(addr));
 		addr += PAGE_SIZE;
 		size -= PAGE_SIZE;
 	}
 	free_pages((unsigned long) virtaddr, order);
 }

 bool omap_vout_dss_omap24xx(void)
 {
 	return omapdss_get_version() == OMAPDSS_VER_OMAP24xx;
 }

 bool omap_vout_dss_omap34xx(void)
 {
 	switch (omapdss_get_version()) {
 	case OMAPDSS_VER_OMAP34xx_ES1:
 	case OMAPDSS_VER_OMAP34xx_ES3:
 	case OMAPDSS_VER_OMAP3630:
 	case OMAPDSS_VER_AM35xx:
 		return true;
 	default:
 		return false;
 	}
 }
	/*
	* omap_voutlib.c
	*
	* Copyright (C) 2005-2010 Texas Instruments.
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program is licensed "as is" without any warranty of any
	* kind, whether express or implied.
	*
	* Based on the OMAP2 camera driver
	* Video-for-Linux (Version 2) camera capture driver for
	* the OMAP24xx camera controller.
	*
	* Author: Andy Lowe (source@mvista.com)
	*
	* Copyright (C) 2004 MontaVista Software, Inc.
	* Copyright (C) 2010 Texas Instruments.
	*
	*/

	#include <linux/module.h>
	#include <linux/errno.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/videodev2.h>

	#include <linux/dma-mapping.h>

	#include <video/omapfb_dss.h>

	#include "omap_voutlib.h"

	MODULE_AUTHOR("Texas Instruments");
	MODULE_DESCRIPTION("OMAP Video library");
	MODULE_LICENSE("GPL");

	/* Return the default overlay cropping rectangle in crop given the image
	* size in pix and the video display size in fbuf. The default
	* cropping rectangle is the largest rectangle no larger than the capture size
	* that will fit on the display. The default cropping rectangle is centered in
	* the image. All dimensions and offsets are rounded down to even numbers.
	*/
	void omap_vout_default_crop(struct v4l2_pix_format *pix,
	struct v4l2_framebuffer fbuf, struct v4l2_rect crop)
	{
	crop->width = (pix->width < fbuf->fmt.width) ?
	pix->width : fbuf->fmt.width;
	crop->height = (pix->height < fbuf->fmt.height) ?
	pix->height : fbuf->fmt.height;
	crop->width &= ~1;
	crop->height &= ~1;
	crop->left = ((pix->width - crop->width) >> 1) & ~1;
	crop->top = ((pix->height - crop->height) >> 1) & ~1;
	}
	EXPORT_SYMBOL_GPL(omap_vout_default_crop);

	/* Given a new render window in new_win, adjust the window to the
	* nearest supported configuration. The adjusted window parameters are
	* returned in new_win.
	* Returns zero if successful, or -EINVAL if the requested window is
	* impossible and cannot reasonably be adjusted.
	*/
	int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
	struct v4l2_window *new_win)
	{
	struct v4l2_rect try_win;

	/* make a working copy of the new_win rectangle */
	try_win = new_win->w;

	/* adjust the preview window so it fits on the display by clipping any
	* offscreen areas
	*/
	if (try_win.left < 0) {
	try_win.width += try_win.left;
	try_win.left = 0;
	}
	if (try_win.top < 0) {
	try_win.height += try_win.top;
	try_win.top = 0;
	}
	try_win.width = (try_win.width < fbuf->fmt.width) ?
	try_win.width : fbuf->fmt.width;
	try_win.height = (try_win.height < fbuf->fmt.height) ?
	try_win.height : fbuf->fmt.height;
	if (try_win.left + try_win.width > fbuf->fmt.width)
	try_win.width = fbuf->fmt.width - try_win.left;
	if (try_win.top + try_win.height > fbuf->fmt.height)
	try_win.height = fbuf->fmt.height - try_win.top;
	try_win.width &= ~1;
	try_win.height &= ~1;

	if (try_win.width <= 0 \|\| try_win.height <= 0)
	return -EINVAL;

	/* We now have a valid preview window, so go with it */
	new_win->w = try_win;
	new_win->field = V4L2_FIELD_ANY;
	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_vout_try_window);

	/* Given a new render window in new_win, adjust the window to the
	* nearest supported configuration. The image cropping window in crop
	* will also be adjusted if necessary. Preference is given to keeping the
	* the window as close to the requested configuration as possible. If
	* successful, new_win, vout->win, and crop are updated.
	* Returns zero if successful, or -EINVAL if the requested preview window is
	* impossible and cannot reasonably be adjusted.
	*/
	int omap_vout_new_window(struct v4l2_rect *crop,
	struct v4l2_window win, struct v4l2_framebuffer fbuf,
	struct v4l2_window *new_win)
	{
	int err;

	err = omap_vout_try_window(fbuf, new_win);
	if (err)
	return err;

	/* update our preview window */
	win->w = new_win->w;
	win->field = new_win->field;
	win->chromakey = new_win->chromakey;

	/* Adjust the cropping window to allow for resizing limitation */
	if (omap_vout_dss_omap24xx()) {
	/* For 24xx limit is 8x to 1/2x scaling. */
	if ((crop->height/win->w.height) >= 2)
	crop->height = win->w.height * 2;

	if ((crop->width/win->w.width) >= 2)
	crop->width = win->w.width * 2;

	if (crop->width > 768) {
	/* The OMAP2420 vertical resizing line buffer is 768
	* pixels wide. If the cropped image is wider than
	* 768 pixels then it cannot be vertically resized.
	*/
	if (crop->height != win->w.height)
	crop->width = 768;
	}
	} else if (omap_vout_dss_omap34xx()) {
	/* For 34xx limit is 8x to 1/4x scaling. */
	if ((crop->height/win->w.height) >= 4)
	crop->height = win->w.height * 4;

	if ((crop->width/win->w.width) >= 4)
	crop->width = win->w.width * 4;
	}
	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_vout_new_window);

	/* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
	* the nearest supported configuration. The image render window in win will
	* also be adjusted if necessary. The preview window is adjusted such that the
	* horizontal and vertical rescaling ratios stay constant. If the render
	* window would fall outside the display boundaries, the cropping rectangle
	* will also be adjusted to maintain the rescaling ratios. If successful, crop
	* and win are updated.
	* Returns zero if successful, or -EINVAL if the requested cropping rectangle is
	* impossible and cannot reasonably be adjusted.
	*/
	int omap_vout_new_crop(struct v4l2_pix_format *pix,
	struct v4l2_rect crop, struct v4l2_window win,
	struct v4l2_framebuffer fbuf, const struct v4l2_rect new_crop)
	{
	struct v4l2_rect try_crop;
	unsigned long vresize, hresize;

	/* make a working copy of the new_crop rectangle */
	try_crop = *new_crop;

	/* adjust the cropping rectangle so it fits in the image */
	if (try_crop.left < 0) {
	try_crop.width += try_crop.left;
	try_crop.left = 0;
	}
	if (try_crop.top < 0) {
	try_crop.height += try_crop.top;
	try_crop.top = 0;
	}
	try_crop.width = (try_crop.width < pix->width) ?
	try_crop.width : pix->width;
	try_crop.height = (try_crop.height < pix->height) ?
	try_crop.height : pix->height;
	if (try_crop.left + try_crop.width > pix->width)
	try_crop.width = pix->width - try_crop.left;
	if (try_crop.top + try_crop.height > pix->height)
	try_crop.height = pix->height - try_crop.top;

	try_crop.width &= ~1;
	try_crop.height &= ~1;

	if (try_crop.width <= 0 \|\| try_crop.height <= 0)
	return -EINVAL;

	if (omap_vout_dss_omap24xx()) {
	if (try_crop.height != win->w.height) {
	/* If we're resizing vertically, we can't support a
	* crop width wider than 768 pixels.
	*/
	if (try_crop.width > 768)
	try_crop.width = 768;
	}
	}
	/* vertical resizing */
	vresize = (1024 * try_crop.height) / win->w.height;
	if (omap_vout_dss_omap24xx() && (vresize > 2048))
	vresize = 2048;
	else if (omap_vout_dss_omap34xx() && (vresize > 4096))
	vresize = 4096;

	win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
	if (win->w.height == 0)
	win->w.height = 2;
	if (win->w.height + win->w.top > fbuf->fmt.height) {
	/* We made the preview window extend below the bottom of the
	* display, so clip it to the display boundary and resize the
	* cropping height to maintain the vertical resizing ratio.
	*/
	win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
	if (try_crop.height == 0)
	try_crop.height = 2;
	}
	/* horizontal resizing */
	hresize = (1024 * try_crop.width) / win->w.width;
	if (omap_vout_dss_omap24xx() && (hresize > 2048))
	hresize = 2048;
	else if (omap_vout_dss_omap34xx() && (hresize > 4096))
	hresize = 4096;

	win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
	if (win->w.width == 0)
	win->w.width = 2;
	if (win->w.width + win->w.left > fbuf->fmt.width) {
	/* We made the preview window extend past the right side of the
	* display, so clip it to the display boundary and resize the
	* cropping width to maintain the horizontal resizing ratio.
	*/
	win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
	if (try_crop.width == 0)
	try_crop.width = 2;
	}
	if (omap_vout_dss_omap24xx()) {
	if ((try_crop.height/win->w.height) >= 2)
	try_crop.height = win->w.height * 2;

	if ((try_crop.width/win->w.width) >= 2)
	try_crop.width = win->w.width * 2;

	if (try_crop.width > 768) {
	/* The OMAP2420 vertical resizing line buffer is
	* 768 pixels wide. If the cropped image is wider
	* than 768 pixels then it cannot be vertically resized.
	*/
	if (try_crop.height != win->w.height)
	try_crop.width = 768;
	}
	} else if (omap_vout_dss_omap34xx()) {
	if ((try_crop.height/win->w.height) >= 4)
	try_crop.height = win->w.height * 4;

	if ((try_crop.width/win->w.width) >= 4)
	try_crop.width = win->w.width * 4;
	}
	/* update our cropping rectangle and we're done */
	*crop = try_crop;
	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_vout_new_crop);

	/* Given a new format in pix and fbuf, crop and win
	* structures are initialized to default values. crop
	* is initialized to the largest window size that will fit on the display. The
	* crop window is centered in the image. win is initialized to
	* the same size as crop and is centered on the display.
	* All sizes and offsets are constrained to be even numbers.
	*/
	void omap_vout_new_format(struct v4l2_pix_format *pix,
	struct v4l2_framebuffer fbuf, struct v4l2_rect crop,
	struct v4l2_window *win)
	{
	/* crop defines the preview source window in the image capture
	* buffer
	*/
	omap_vout_default_crop(pix, fbuf, crop);

	/* win defines the preview target window on the display */
	win->w.width = crop->width;
	win->w.height = crop->height;
	win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
	win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
	}
	EXPORT_SYMBOL_GPL(omap_vout_new_format);

	/*
	* Allocate buffers
	*/
	unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
	{
	u32 order, size;
	unsigned long virt_addr, addr;

	size = PAGE_ALIGN(buf_size);
	order = get_order(size);
	virt_addr = __get_free_pages(GFP_KERNEL, order);
	addr = virt_addr;

	if (virt_addr) {
	while (size > 0) {
	SetPageReserved(virt_to_page(addr));
	addr += PAGE_SIZE;
	size -= PAGE_SIZE;
	}
	}
	phys_addr = (u32) virt_to_phys((void ) virt_addr);
	return virt_addr;
	}

	/*
	* Free buffers
	*/
	void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
	{
	u32 order, size;
	unsigned long addr = virtaddr;

	size = PAGE_ALIGN(buf_size);
	order = get_order(size);

	while (size > 0) {
	ClearPageReserved(virt_to_page(addr));
	addr += PAGE_SIZE;
	size -= PAGE_SIZE;
	}
	free_pages((unsigned long) virtaddr, order);
	}

	bool omap_vout_dss_omap24xx(void)
	{
	return omapdss_get_version() == OMAPDSS_VER_OMAP24xx;
	}

	bool omap_vout_dss_omap34xx(void)
	{
	switch (omapdss_get_version()) {
	case OMAPDSS_VER_OMAP34xx_ES1:
	case OMAPDSS_VER_OMAP34xx_ES3:
	case OMAPDSS_VER_OMAP3630:
	case OMAPDSS_VER_AM35xx:
	return true;
	default:
	return false;
	}
	}