path: root/drivers/media/v4l2-core/videobuf2-vmalloc.c
diff options
authorStanimir Varbanov <stanimir.varbanov@linaro.org>2017-08-21 07:34:10 -0400
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-08-26 14:15:54 -0400
commit5b6f9abe5a49df81737fbbfba890ee5b093f8168 (patch)
tree4e93b0ae2f3405ff80bb61c4212be27a8f7b03d3 /drivers/media/v4l2-core/videobuf2-vmalloc.c
parentd533d5010ec373ea06ae4f253d7d69deb3fe0cfd (diff)
media: vb2: add bidirectional flag in vb2_queue
This change is intended to give to the v4l2 drivers a choice to change the default behavior of the v4l2-core DMA mapping direction from DMA_TO/FROM_DEVICE (depending on the buffer type CAPTURE or OUTPUT) to DMA_BIDIRECTIONAL during queue_init time. Initially the issue with DMA mapping direction has been found in Venus encoder driver where the hardware (firmware side) adds few lines padding on bottom of the image buffer, and the consequence is triggering of IOMMU protection faults. This will help supporting venus encoder (and probably other drivers in the future) which wants to map output type of buffers as read/write. Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Hans Verkuil <hansverk@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-vmalloc.c')
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 6bc130fe84f6..3a7c80cd1a17 100644
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -87,7 +87,8 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr,
buf->dma_dir = dma_dir;
offset = vaddr & ~PAGE_MASK;
buf->size = size;
- vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE);
+ vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE ||
+ dma_dir == DMA_BIDIRECTIONAL);
if (IS_ERR(vec)) {
ret = PTR_ERR(vec);
goto fail_pfnvec_create;
@@ -137,7 +138,8 @@ static void vb2_vmalloc_put_userptr(void *buf_priv)
pages = frame_vector_pages(buf->vec);
if (vaddr)
vm_unmap_ram((void *)vaddr, n_pages);
- if (buf->dma_dir == DMA_FROM_DEVICE)
+ if (buf->dma_dir == DMA_FROM_DEVICE ||
+ buf->dma_dir == DMA_BIDIRECTIONAL)
for (i = 0; i < n_pages; i++)
} else {

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