drivers/media/platform/omap/omap_vout_vrfb.c - kernel/quantenna - Git at Google

 /*
  * omap_vout_vrfb.c
  *
  * Copyright (C) 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.
  *
  */

 #include <linux/sched.h>
 #include <linux/platform_device.h>
 #include <linux/videodev2.h>

 #include <media/videobuf-dma-contig.h>
 #include <media/v4l2-device.h>

 #include <linux/omap-dma.h>
 #include <video/omapvrfb.h>

 #include "omap_voutdef.h"
 #include "omap_voutlib.h"
 #include "omap_vout_vrfb.h"

 #define OMAP_DMA_NO_DEVICE	0

 /*
  * Function for allocating video buffers
  */
 static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
 		unsigned int *count, int startindex)
 {
 	int i, j;

 	for (i = 0; i < *count; i++) {
 		if (!vout->smsshado_virt_addr[i]) {
 			vout->smsshado_virt_addr[i] =
 				omap_vout_alloc_buffer(vout->smsshado_size,
 						&vout->smsshado_phy_addr[i]);
 		}
 		if (!vout->smsshado_virt_addr[i] && startindex != -1) {
 			if (V4L2_MEMORY_MMAP == vout->memory && i >= startindex)
 				break;
 		}
 		if (!vout->smsshado_virt_addr[i]) {
 			for (j = 0; j < i; j++) {
 				omap_vout_free_buffer(
 						vout->smsshado_virt_addr[j],
 						vout->smsshado_size);
 				vout->smsshado_virt_addr[j] = 0;
 				vout->smsshado_phy_addr[j] = 0;
 			}
 			*count = 0;
 			return -ENOMEM;
 		}
 		memset((void *) vout->smsshado_virt_addr[i], 0,
 				vout->smsshado_size);
 	}
 	return 0;
 }

 /*
  * Wakes up the application once the DMA transfer to VRFB space is completed.
  */
 static void omap_vout_vrfb_dma_tx_callback(int lch, u16 ch_status, void *data)
 {
 	struct vid_vrfb_dma *t = (struct vid_vrfb_dma *) data;

 	t->tx_status = 1;
 	wake_up_interruptible(&t->wait);
 }

 /*
  * Free VRFB buffers
  */
 void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
 {
 	int j;

 	for (j = 0; j < VRFB_NUM_BUFS; j++) {
 		if (vout->smsshado_virt_addr[j]) {
 			omap_vout_free_buffer(vout->smsshado_virt_addr[j],
 					      vout->smsshado_size);
 			vout->smsshado_virt_addr[j] = 0;
 			vout->smsshado_phy_addr[j] = 0;
 		}
 	}
 }

 int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
 			      bool static_vrfb_allocation)
 {
 	int ret = 0, i, j;
 	struct omap_vout_device *vout;
 	struct video_device *vfd;
 	int image_width, image_height;
 	int vrfb_num_bufs = VRFB_NUM_BUFS;
 	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 	struct omap2video_device *vid_dev =
 		container_of(v4l2_dev, struct omap2video_device, v4l2_dev);

 	vout = vid_dev->vouts[vid_num];
 	vfd = vout->vfd;

 	for (i = 0; i < VRFB_NUM_BUFS; i++) {
 		if (omap_vrfb_request_ctx(&vout->vrfb_context[i])) {
 			dev_info(&pdev->dev, ": VRFB allocation failed\n");
 			for (j = 0; j < i; j++)
 				omap_vrfb_release_ctx(&vout->vrfb_context[j]);
 			ret = -ENOMEM;
 			goto free_buffers;
 		}
 	}

 	/* Calculate VRFB memory size */
 	/* allocate for worst case size */
 	image_width = VID_MAX_WIDTH / TILE_SIZE;
 	if (VID_MAX_WIDTH % TILE_SIZE)
 		image_width++;

 	image_width = image_width * TILE_SIZE;
 	image_height = VID_MAX_HEIGHT / TILE_SIZE;

 	if (VID_MAX_HEIGHT % TILE_SIZE)
 		image_height++;

 	image_height = image_height * TILE_SIZE;
 	vout->smsshado_size = PAGE_ALIGN(image_width * image_height * 2 * 2);

 	/*
 	 * Request and Initialize DMA, for DMA based VRFB transfer
 	 */
 	vout->vrfb_dma_tx.dev_id = OMAP_DMA_NO_DEVICE;
 	vout->vrfb_dma_tx.dma_ch = -1;
 	vout->vrfb_dma_tx.req_status = DMA_CHAN_ALLOTED;
 	ret = omap_request_dma(vout->vrfb_dma_tx.dev_id, "VRFB DMA TX",
 			omap_vout_vrfb_dma_tx_callback,
 			(void *) &vout->vrfb_dma_tx, &vout->vrfb_dma_tx.dma_ch);
 	if (ret < 0) {
 		vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
 		dev_info(&pdev->dev, ": failed to allocate DMA Channel for"
 				" video%d\n", vfd->minor);
 	}
 	init_waitqueue_head(&vout->vrfb_dma_tx.wait);

 	/* statically allocated the VRFB buffer is done through
 	   commands line aruments */
 	if (static_vrfb_allocation) {
 		if (omap_vout_allocate_vrfb_buffers(vout, &vrfb_num_bufs, -1)) {
 			ret =  -ENOMEM;
 			goto release_vrfb_ctx;
 		}
 		vout->vrfb_static_allocation = true;
 	}
 	return 0;

 release_vrfb_ctx:
 	for (j = 0; j < VRFB_NUM_BUFS; j++)
 		omap_vrfb_release_ctx(&vout->vrfb_context[j]);
 free_buffers:
 	omap_vout_free_buffers(vout);

 	return ret;
 }

 /*
  * Release the VRFB context once the module exits
  */
 void omap_vout_release_vrfb(struct omap_vout_device *vout)
 {
 	int i;

 	for (i = 0; i < VRFB_NUM_BUFS; i++)
 		omap_vrfb_release_ctx(&vout->vrfb_context[i]);

 	if (vout->vrfb_dma_tx.req_status == DMA_CHAN_ALLOTED) {
 		vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
 		omap_free_dma(vout->vrfb_dma_tx.dma_ch);
 	}
 }

 /*
  * Allocate the buffers for the VRFB space.  Data is copied from V4L2
  * buffers to the VRFB buffers using the DMA engine.
  */
 int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
 			  unsigned int *count, unsigned int startindex)
 {
 	int i;
 	bool yuv_mode;

 	if (!is_rotation_enabled(vout))
 		return 0;

 	/* If rotation is enabled, allocate memory for VRFB space also */
 	*count = *count > VRFB_NUM_BUFS ? VRFB_NUM_BUFS : *count;

 	/* Allocate the VRFB buffers only if the buffers are not
 	 * allocated during init time.
 	 */
 	if (!vout->vrfb_static_allocation)
 		if (omap_vout_allocate_vrfb_buffers(vout, count, startindex))
 			return -ENOMEM;

 	if (vout->dss_mode == OMAP_DSS_COLOR_YUV2 ||
 			vout->dss_mode == OMAP_DSS_COLOR_UYVY)
 		yuv_mode = true;
 	else
 		yuv_mode = false;

 	for (i = 0; i < *count; i++)
 		omap_vrfb_setup(&vout->vrfb_context[i],
 				vout->smsshado_phy_addr[i], vout->pix.width,
 				vout->pix.height, vout->bpp, yuv_mode);

 	return 0;
 }

 int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
 				struct videobuf_buffer *vb)
 {
 	dma_addr_t dmabuf;
 	struct vid_vrfb_dma *tx;
 	enum dss_rotation rotation;
 	u32 dest_frame_index = 0, src_element_index = 0;
 	u32 dest_element_index = 0, src_frame_index = 0;
 	u32 elem_count = 0, frame_count = 0, pixsize = 2;

 	if (!is_rotation_enabled(vout))
 		return 0;

 	dmabuf = vout->buf_phy_addr[vb->i];
 	/* If rotation is enabled, copy input buffer into VRFB
 	 * memory space using DMA. We are copying input buffer
 	 * into VRFB memory space of desired angle and DSS will
 	 * read image VRFB memory for 0 degree angle
 	 */
 	pixsize = vout->bpp * vout->vrfb_bpp;
 	/*
 	 * DMA transfer in double index mode
 	 */

 	/* Frame index */
 	dest_frame_index = ((MAX_PIXELS_PER_LINE * pixsize) -
 			(vout->pix.width * vout->bpp)) + 1;

 	/* Source and destination parameters */
 	src_element_index = 0;
 	src_frame_index = 0;
 	dest_element_index = 1;
 	/* Number of elements per frame */
 	elem_count = vout->pix.width * vout->bpp;
 	frame_count = vout->pix.height;
 	tx = &vout->vrfb_dma_tx;
 	tx->tx_status = 0;
 	omap_set_dma_transfer_params(tx->dma_ch, OMAP_DMA_DATA_TYPE_S32,
 			(elem_count / 4), frame_count, OMAP_DMA_SYNC_ELEMENT,
 			tx->dev_id, 0x0);
 	/* src_port required only for OMAP1 */
 	omap_set_dma_src_params(tx->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
 			dmabuf, src_element_index, src_frame_index);
 	/*set dma source burst mode for VRFB */
 	omap_set_dma_src_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
 	rotation = calc_rotation(vout);

 	/* dest_port required only for OMAP1 */
 	omap_set_dma_dest_params(tx->dma_ch, 0, OMAP_DMA_AMODE_DOUBLE_IDX,
 			vout->vrfb_context[vb->i].paddr[0], dest_element_index,
 			dest_frame_index);
 	/*set dma dest burst mode for VRFB */
 	omap_set_dma_dest_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
 	omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, 0x20, 0);

 	omap_start_dma(tx->dma_ch);
 	wait_event_interruptible_timeout(tx->wait, tx->tx_status == 1,
 					 VRFB_TX_TIMEOUT);

 	if (tx->tx_status == 0) {
 		omap_stop_dma(tx->dma_ch);
 		return -EINVAL;
 	}
 	/* Store buffers physical address into an array. Addresses
 	 * from this array will be used to configure DSS */
 	vout->queued_buf_addr[vb->i] = (u8 *)
 		vout->vrfb_context[vb->i].paddr[rotation];
 	return 0;
 }

 /*
  * Calculate the buffer offsets from which the streaming should
  * start. This offset calculation is mainly required because of
  * the VRFB 32 pixels alignment with rotation.
  */
 void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
 {
 	enum dss_rotation rotation;
 	bool mirroring = vout->mirror;
 	struct v4l2_rect *crop = &vout->crop;
 	struct v4l2_pix_format *pix = &vout->pix;
 	int *cropped_offset = &vout->cropped_offset;
 	int vr_ps = 1, ps = 2, temp_ps = 2;
 	int offset = 0, ctop = 0, cleft = 0, line_length = 0;

 	rotation = calc_rotation(vout);

 	if (V4L2_PIX_FMT_YUYV == pix->pixelformat ||
 			V4L2_PIX_FMT_UYVY == pix->pixelformat) {
 		if (is_rotation_enabled(vout)) {
 			/*
 			 * ps    - Actual pixel size for YUYV/UYVY for
 			 *         VRFB/Mirroring is 4 bytes
 			 * vr_ps - Virtually pixel size for YUYV/UYVY is
 			 *         2 bytes
 			 */
 			ps = 4;
 			vr_ps = 2;
 		} else {
 			ps = 2;	/* otherwise the pixel size is 2 byte */
 		}
 	} else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat) {
 		ps = 4;
 	} else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat) {
 		ps = 3;
 	}
 	vout->ps = ps;
 	vout->vr_ps = vr_ps;

 	if (is_rotation_enabled(vout)) {
 		line_length = MAX_PIXELS_PER_LINE;
 		ctop = (pix->height - crop->height) - crop->top;
 		cleft = (pix->width - crop->width) - crop->left;
 	} else {
 		line_length = pix->width;
 	}
 	vout->line_length = line_length;
 	switch (rotation) {
 	case dss_rotation_90_degree:
 		offset = vout->vrfb_context[0].yoffset *
 			vout->vrfb_context[0].bytespp;
 		temp_ps = ps / vr_ps;
 		if (!mirroring) {
 			*cropped_offset = offset + line_length *
 				temp_ps * cleft + crop->top * temp_ps;
 		} else {
 			*cropped_offset = offset + line_length * temp_ps *
 				cleft + crop->top * temp_ps + (line_length *
 				((crop->width / (vr_ps)) - 1) * ps);
 		}
 		break;
 	case dss_rotation_180_degree:
 		offset = ((MAX_PIXELS_PER_LINE * vout->vrfb_context[0].yoffset *
 			vout->vrfb_context[0].bytespp) +
 			(vout->vrfb_context[0].xoffset *
 			vout->vrfb_context[0].bytespp));
 		if (!mirroring) {
 			*cropped_offset = offset + (line_length * ps * ctop) +
 				(cleft / vr_ps) * ps;

 		} else {
 			*cropped_offset = offset + (line_length * ps * ctop) +
 				(cleft / vr_ps) * ps + (line_length *
 				(crop->height - 1) * ps);
 		}
 		break;
 	case dss_rotation_270_degree:
 		offset = MAX_PIXELS_PER_LINE * vout->vrfb_context[0].xoffset *
 			vout->vrfb_context[0].bytespp;
 		temp_ps = ps / vr_ps;
 		if (!mirroring) {
 			*cropped_offset = offset + line_length *
 			    temp_ps * crop->left + ctop * ps;
 		} else {
 			*cropped_offset = offset + line_length *
 				temp_ps * crop->left + ctop * ps +
 				(line_length * ((crop->width / vr_ps) - 1) *
 				 ps);
 		}
 		break;
 	case dss_rotation_0_degree:
 		if (!mirroring) {
 			*cropped_offset = (line_length * ps) *
 				crop->top + (crop->left / vr_ps) * ps;
 		} else {
 			*cropped_offset = (line_length * ps) *
 				crop->top + (crop->left / vr_ps) * ps +
 				(line_length * (crop->height - 1) * ps);
 		}
 		break;
 	default:
 		*cropped_offset = (line_length * ps * crop->top) /
 			vr_ps + (crop->left * ps) / vr_ps +
 			((crop->width / vr_ps) - 1) * ps;
 		break;
 	}
 }
	/*
	* omap_vout_vrfb.c
	*
	* Copyright (C) 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.
	*
	*/

	#include <linux/sched.h>
	#include <linux/platform_device.h>
	#include <linux/videodev2.h>

	#include <media/videobuf-dma-contig.h>
	#include <media/v4l2-device.h>

	#include <linux/omap-dma.h>
	#include <video/omapvrfb.h>

	#include "omap_voutdef.h"
	#include "omap_voutlib.h"
	#include "omap_vout_vrfb.h"

	#define OMAP_DMA_NO_DEVICE 0

	/*
	* Function for allocating video buffers
	*/
	static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
	unsigned int *count, int startindex)
	{
	int i, j;

	for (i = 0; i < *count; i++) {
	if (!vout->smsshado_virt_addr[i]) {
	vout->smsshado_virt_addr[i] =
	omap_vout_alloc_buffer(vout->smsshado_size,
	&vout->smsshado_phy_addr[i]);
	}
	if (!vout->smsshado_virt_addr[i] && startindex != -1) {
	if (V4L2_MEMORY_MMAP == vout->memory && i >= startindex)
	break;
	}
	if (!vout->smsshado_virt_addr[i]) {
	for (j = 0; j < i; j++) {
	omap_vout_free_buffer(
	vout->smsshado_virt_addr[j],
	vout->smsshado_size);
	vout->smsshado_virt_addr[j] = 0;
	vout->smsshado_phy_addr[j] = 0;
	}
	*count = 0;
	return -ENOMEM;
	}
	memset((void *) vout->smsshado_virt_addr[i], 0,
	vout->smsshado_size);
	}
	return 0;
	}

	/*
	* Wakes up the application once the DMA transfer to VRFB space is completed.
	*/
	static void omap_vout_vrfb_dma_tx_callback(int lch, u16 ch_status, void *data)
	{
	struct vid_vrfb_dma t = (struct vid_vrfb_dma ) data;

	t->tx_status = 1;
	wake_up_interruptible(&t->wait);
	}

	/*
	* Free VRFB buffers
	*/
	void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
	{
	int j;

	for (j = 0; j < VRFB_NUM_BUFS; j++) {
	if (vout->smsshado_virt_addr[j]) {
	omap_vout_free_buffer(vout->smsshado_virt_addr[j],
	vout->smsshado_size);
	vout->smsshado_virt_addr[j] = 0;
	vout->smsshado_phy_addr[j] = 0;
	}
	}
	}

	int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
	bool static_vrfb_allocation)
	{
	int ret = 0, i, j;
	struct omap_vout_device *vout;
	struct video_device *vfd;
	int image_width, image_height;
	int vrfb_num_bufs = VRFB_NUM_BUFS;
	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
	struct omap2video_device *vid_dev =
	container_of(v4l2_dev, struct omap2video_device, v4l2_dev);

	vout = vid_dev->vouts[vid_num];
	vfd = vout->vfd;

	for (i = 0; i < VRFB_NUM_BUFS; i++) {
	if (omap_vrfb_request_ctx(&vout->vrfb_context[i])) {
	dev_info(&pdev->dev, ": VRFB allocation failed\n");
	for (j = 0; j < i; j++)
	omap_vrfb_release_ctx(&vout->vrfb_context[j]);
	ret = -ENOMEM;
	goto free_buffers;
	}
	}

	/* Calculate VRFB memory size */
	/* allocate for worst case size */
	image_width = VID_MAX_WIDTH / TILE_SIZE;
	if (VID_MAX_WIDTH % TILE_SIZE)
	image_width++;

	image_width = image_width * TILE_SIZE;
	image_height = VID_MAX_HEIGHT / TILE_SIZE;

	if (VID_MAX_HEIGHT % TILE_SIZE)
	image_height++;

	image_height = image_height * TILE_SIZE;
	vout->smsshado_size = PAGE_ALIGN(image_width * image_height * 2 * 2);

	/*
	* Request and Initialize DMA, for DMA based VRFB transfer
	*/
	vout->vrfb_dma_tx.dev_id = OMAP_DMA_NO_DEVICE;
	vout->vrfb_dma_tx.dma_ch = -1;
	vout->vrfb_dma_tx.req_status = DMA_CHAN_ALLOTED;
	ret = omap_request_dma(vout->vrfb_dma_tx.dev_id, "VRFB DMA TX",
	omap_vout_vrfb_dma_tx_callback,
	(void *) &vout->vrfb_dma_tx, &vout->vrfb_dma_tx.dma_ch);
	if (ret < 0) {
	vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
	dev_info(&pdev->dev, ": failed to allocate DMA Channel for"
	" video%d\n", vfd->minor);
	}
	init_waitqueue_head(&vout->vrfb_dma_tx.wait);

	/* statically allocated the VRFB buffer is done through
	commands line aruments */
	if (static_vrfb_allocation) {
	if (omap_vout_allocate_vrfb_buffers(vout, &vrfb_num_bufs, -1)) {
	ret = -ENOMEM;
	goto release_vrfb_ctx;
	}
	vout->vrfb_static_allocation = true;
	}
	return 0;

	release_vrfb_ctx:
	for (j = 0; j < VRFB_NUM_BUFS; j++)
	omap_vrfb_release_ctx(&vout->vrfb_context[j]);
	free_buffers:
	omap_vout_free_buffers(vout);

	return ret;
	}

	/*
	* Release the VRFB context once the module exits
	*/
	void omap_vout_release_vrfb(struct omap_vout_device *vout)
	{
	int i;

	for (i = 0; i < VRFB_NUM_BUFS; i++)
	omap_vrfb_release_ctx(&vout->vrfb_context[i]);

	if (vout->vrfb_dma_tx.req_status == DMA_CHAN_ALLOTED) {
	vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
	omap_free_dma(vout->vrfb_dma_tx.dma_ch);
	}
	}

	/*
	* Allocate the buffers for the VRFB space. Data is copied from V4L2
	* buffers to the VRFB buffers using the DMA engine.
	*/
	int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
	unsigned int *count, unsigned int startindex)
	{
	int i;
	bool yuv_mode;

	if (!is_rotation_enabled(vout))
	return 0;

	/* If rotation is enabled, allocate memory for VRFB space also */
	count = count > VRFB_NUM_BUFS ? VRFB_NUM_BUFS : *count;

	/* Allocate the VRFB buffers only if the buffers are not
	* allocated during init time.
	*/
	if (!vout->vrfb_static_allocation)
	if (omap_vout_allocate_vrfb_buffers(vout, count, startindex))
	return -ENOMEM;

	if (vout->dss_mode == OMAP_DSS_COLOR_YUV2 \|\|
	vout->dss_mode == OMAP_DSS_COLOR_UYVY)
	yuv_mode = true;
	else
	yuv_mode = false;

	for (i = 0; i < *count; i++)
	omap_vrfb_setup(&vout->vrfb_context[i],
	vout->smsshado_phy_addr[i], vout->pix.width,
	vout->pix.height, vout->bpp, yuv_mode);

	return 0;
	}

	int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
	struct videobuf_buffer *vb)
	{
	dma_addr_t dmabuf;
	struct vid_vrfb_dma *tx;
	enum dss_rotation rotation;
	u32 dest_frame_index = 0, src_element_index = 0;
	u32 dest_element_index = 0, src_frame_index = 0;
	u32 elem_count = 0, frame_count = 0, pixsize = 2;

	if (!is_rotation_enabled(vout))
	return 0;

	dmabuf = vout->buf_phy_addr[vb->i];
	/* If rotation is enabled, copy input buffer into VRFB
	* memory space using DMA. We are copying input buffer
	* into VRFB memory space of desired angle and DSS will
	* read image VRFB memory for 0 degree angle
	*/
	pixsize = vout->bpp * vout->vrfb_bpp;
	/*
	* DMA transfer in double index mode
	*/

	/* Frame index */
	dest_frame_index = ((MAX_PIXELS_PER_LINE * pixsize) -
	(vout->pix.width * vout->bpp)) + 1;

	/* Source and destination parameters */
	src_element_index = 0;
	src_frame_index = 0;
	dest_element_index = 1;
	/* Number of elements per frame */
	elem_count = vout->pix.width * vout->bpp;
	frame_count = vout->pix.height;
	tx = &vout->vrfb_dma_tx;
	tx->tx_status = 0;
	omap_set_dma_transfer_params(tx->dma_ch, OMAP_DMA_DATA_TYPE_S32,
	(elem_count / 4), frame_count, OMAP_DMA_SYNC_ELEMENT,
	tx->dev_id, 0x0);
	/* src_port required only for OMAP1 */
	omap_set_dma_src_params(tx->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
	dmabuf, src_element_index, src_frame_index);
	/set dma source burst mode for VRFB /
	omap_set_dma_src_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
	rotation = calc_rotation(vout);

	/* dest_port required only for OMAP1 */
	omap_set_dma_dest_params(tx->dma_ch, 0, OMAP_DMA_AMODE_DOUBLE_IDX,
	vout->vrfb_context[vb->i].paddr[0], dest_element_index,
	dest_frame_index);
	/set dma dest burst mode for VRFB /
	omap_set_dma_dest_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
	omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, 0x20, 0);

	omap_start_dma(tx->dma_ch);
	wait_event_interruptible_timeout(tx->wait, tx->tx_status == 1,
	VRFB_TX_TIMEOUT);

	if (tx->tx_status == 0) {
	omap_stop_dma(tx->dma_ch);
	return -EINVAL;
	}
	/* Store buffers physical address into an array. Addresses
	* from this array will be used to configure DSS */
	vout->queued_buf_addr[vb->i] = (u8 *)
	vout->vrfb_context[vb->i].paddr[rotation];
	return 0;
	}

	/*
	* Calculate the buffer offsets from which the streaming should
	* start. This offset calculation is mainly required because of
	* the VRFB 32 pixels alignment with rotation.
	*/
	void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
	{
	enum dss_rotation rotation;
	bool mirroring = vout->mirror;
	struct v4l2_rect *crop = &vout->crop;
	struct v4l2_pix_format *pix = &vout->pix;
	int *cropped_offset = &vout->cropped_offset;
	int vr_ps = 1, ps = 2, temp_ps = 2;
	int offset = 0, ctop = 0, cleft = 0, line_length = 0;

	rotation = calc_rotation(vout);

	if (V4L2_PIX_FMT_YUYV == pix->pixelformat \|\|
	V4L2_PIX_FMT_UYVY == pix->pixelformat) {
	if (is_rotation_enabled(vout)) {
	/*
	* ps - Actual pixel size for YUYV/UYVY for
	* VRFB/Mirroring is 4 bytes
	* vr_ps - Virtually pixel size for YUYV/UYVY is
	* 2 bytes
	*/
	ps = 4;
	vr_ps = 2;
	} else {
	ps = 2; /* otherwise the pixel size is 2 byte */
	}
	} else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat) {
	ps = 4;
	} else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat) {
	ps = 3;
	}
	vout->ps = ps;
	vout->vr_ps = vr_ps;

	if (is_rotation_enabled(vout)) {
	line_length = MAX_PIXELS_PER_LINE;
	ctop = (pix->height - crop->height) - crop->top;
	cleft = (pix->width - crop->width) - crop->left;
	} else {
	line_length = pix->width;
	}
	vout->line_length = line_length;
	switch (rotation) {
	case dss_rotation_90_degree:
	offset = vout->vrfb_context[0].yoffset *
	vout->vrfb_context[0].bytespp;
	temp_ps = ps / vr_ps;
	if (!mirroring) {
	cropped_offset = offset + line_length
	temp_ps * cleft + crop->top * temp_ps;
	} else {
	cropped_offset = offset + line_length temp_ps *
	cleft + crop->top * temp_ps + (line_length *
	((crop->width / (vr_ps)) - 1) * ps);
	}
	break;
	case dss_rotation_180_degree:
	offset = ((MAX_PIXELS_PER_LINE * vout->vrfb_context[0].yoffset *
	vout->vrfb_context[0].bytespp) +
	(vout->vrfb_context[0].xoffset *
	vout->vrfb_context[0].bytespp));
	if (!mirroring) {
	cropped_offset = offset + (line_length ps * ctop) +
	(cleft / vr_ps) * ps;

	} else {
	cropped_offset = offset + (line_length ps * ctop) +
	(cleft / vr_ps) * ps + (line_length *
	(crop->height - 1) * ps);
	}
	break;
	case dss_rotation_270_degree:
	offset = MAX_PIXELS_PER_LINE * vout->vrfb_context[0].xoffset *
	vout->vrfb_context[0].bytespp;
	temp_ps = ps / vr_ps;
	if (!mirroring) {
	cropped_offset = offset + line_length
	temp_ps * crop->left + ctop * ps;
	} else {
	cropped_offset = offset + line_length
	temp_ps * crop->left + ctop * ps +
	(line_length * ((crop->width / vr_ps) - 1) *
	ps);
	}
	break;
	case dss_rotation_0_degree:
	if (!mirroring) {
	cropped_offset = (line_length ps) *
	crop->top + (crop->left / vr_ps) * ps;
	} else {
	cropped_offset = (line_length ps) *
	crop->top + (crop->left / vr_ps) * ps +
	(line_length * (crop->height - 1) * ps);
	}
	break;
	default:
	cropped_offset = (line_length ps * crop->top) /
	vr_ps + (crop->left * ps) / vr_ps +
	((crop->width / vr_ps) - 1) * ps;
	break;
	}
	}