Commit f5d0f9d6 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Kieran Bingham
Browse files

v4l: vsp1: Add API to map and unmap DRM buffers through the VSP 



The display buffers must be mapped for DMA through the device that
performs memory access. Expose an API to map and unmap memory through
the VSP device to be used by the DU.

As all the buffers allocated by the DU driver are coherent, we can skip
cache handling when mapping and unmapping them. This will need to be
revisited when support for non-coherent buffers will be added to the DU
driver.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: default avatarKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
[Kieran: Remove unused header]
Signed-off-by: default avatarKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: default avatarMauro Cavalho Chehab <mchehab@s-opensource.com>
parent 2cc2137f

drivers/media/platform/vsp1/vsp1_drm.c

+24 −0
Original line number Original line Diff line number Diff line
@@ -12,6 +12,7 @@ 
 */

 */





#include <linux/device.h>

#include <linux/device.h>

#include <linux/dma-mapping.h>

#include <linux/slab.h>

#include <linux/slab.h>





#include <media/media-entity.h>

#include <media/media-entity.h>
@@ -540,6 +541,29 @@ void vsp1_du_atomic_flush(struct device *dev) 
}

}

EXPORT_SYMBOL_GPL(vsp1_du_atomic_flush);

EXPORT_SYMBOL_GPL(vsp1_du_atomic_flush);





int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt)

{

	struct vsp1_device *vsp1 = dev_get_drvdata(dev);



	/*

	 * As all the buffers allocated by the DU driver are coherent, we can

	 * skip cache sync. This will need to be revisited when support for

	 * non-coherent buffers will be added to the DU driver.

	 */

	return dma_map_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,

				DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);

}

EXPORT_SYMBOL_GPL(vsp1_du_map_sg);



void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt)

{

	struct vsp1_device *vsp1 = dev_get_drvdata(dev);



	dma_unmap_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,

			   DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);

}

EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);



/* -----------------------------------------------------------------------------

/* -----------------------------------------------------------------------------

 * Initialization

 * Initialization

 */

 */

include/media/vsp1.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -13,6 +13,7 @@ 
#ifndef __MEDIA_VSP1_H__

#ifndef __MEDIA_VSP1_H__

#define __MEDIA_VSP1_H__

#define __MEDIA_VSP1_H__





#include <linux/scatterlist.h>

#include <linux/types.h>

#include <linux/types.h>

#include <linux/videodev2.h>

#include <linux/videodev2.h>
@@ -53,5 +54,7 @@ void vsp1_du_atomic_begin(struct device *dev); 
int vsp1_du_atomic_update(struct device *dev, unsigned int rpf,

int vsp1_du_atomic_update(struct device *dev, unsigned int rpf,

			  const struct vsp1_du_atomic_config *cfg);

			  const struct vsp1_du_atomic_config *cfg);

void vsp1_du_atomic_flush(struct device *dev);

void vsp1_du_atomic_flush(struct device *dev);

int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt);

void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt);





#endif /* __MEDIA_VSP1_H__ */
 
#endif /* __MEDIA_VSP1_H__ */

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