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[media] media: ti-vpe: vpdma: Use bidirectional cached buffers 

VPDMA buffer will be used by CPU as well as by the VPDMA.
CPU will write/update the VPDMA descriptors containing data
about the video buffer DMA addresses.
VPDMA will write the "write descriptor" containing the
data about the DMA operation.

When mapping/unmapping the buffer, driver has to take care of
WriteBack and invalidation of the cache so that all the
coherency is maintained from both directions.

Use DMA_BIDIRECTIONAL to maintain coherency between CPU and VPDMA.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
hifive-unleashed-5.1
Nikhil Devshatwar 2016-11-18 21:20:36 -02:00 committed by Mauro Carvalho Chehab
parent c786595beb
commit 07e72eb072
1 changed files with 3 additions and 2 deletions
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5
drivers/media/platform/ti-vpe/vpdma.c
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@ -367,7 +367,7 @@ int vpdma_map_desc_buf(struct vpdma_data *vpdma, struct vpdma_buf *buf)
WARN_ON(buf->mapped);
buf->dma_addr = dma_map_single(dev, buf->addr, buf->size,
DMA_TO_DEVICE);
DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, buf->dma_addr)) {
dev_err(dev, "failed to map buffer\n");
return -EINVAL;
@ -388,7 +388,8 @@ void vpdma_unmap_desc_buf(struct vpdma_data *vpdma, struct vpdma_buf *buf)
struct device *dev = &vpdma->pdev->dev;
if (buf->mapped)
dma_unmap_single(dev, buf->dma_addr, buf->size, DMA_TO_DEVICE);
dma_unmap_single(dev, buf->dma_addr, buf->size,
DMA_BIDIRECTIONAL);
buf->mapped = false;
}