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| author | Nikhil Devshatwar <nikhil.nd@ti.com> | 2016-11-18 21:20:36 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-11-22 08:07:53 -0200 |
| commit | 07e72eb0725ccd20b5cc26ee463def3f34606c7f (patch) | |
| tree | 65d8a7dc2e8ad5ee48def7103ea3fe956f99fe26 /drivers | |
| parent | c786595beb89d74ff709b2ee382f34a1e0040d88 (diff) | |
| download | linux-07e72eb0725ccd20b5cc26ee463def3f34606c7f.tar.gz | |
[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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/platform/ti-vpe/vpdma.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/platform/ti-vpe/vpdma.c b/drivers/media/platform/ti-vpe/vpdma.c index 070937fe1af6..2d13644a28a8 100644 --- a/drivers/media/platform/ti-vpe/vpdma.c +++ b/drivers/media/platform/ti-vpe/vpdma.c @@ -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; } |