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Subject[RFC][PATCHv2 07/12] videobuf2: do not sync caches when we are allowed not to
Date
Skip ->prepare() or/and ->finish() cache synchronisation if
user-space requested us to do so (or when queue dma direction
permits us to skip cache syncs).

Change-Id: I37c89d666542ed8d536eac329953d921bb1c94b6
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
drivers/media/common/videobuf2/videobuf2-core.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 46be9c790ff6..c3637ca0c65b 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -304,8 +304,11 @@ static void __vb2_buf_mem_prepare(struct vb2_buffer *vb)
{
unsigned int plane;

- for (plane = 0; plane < vb->num_planes; ++plane)
- call_void_memop(vb, prepare, vb->planes[plane].mem_priv);
+ if (vb->need_cache_sync_on_prepare) {
+ for (plane = 0; plane < vb->num_planes; ++plane)
+ call_void_memop(vb, prepare,
+ vb->planes[plane].mem_priv);
+ }
vb->synced = 1;
}

@@ -317,8 +320,11 @@ static void __vb2_buf_mem_finish(struct vb2_buffer *vb)
{
unsigned int plane;

- for (plane = 0; plane < vb->num_planes; ++plane)
- call_void_memop(vb, finish, vb->planes[plane].mem_priv);
+ if (vb->need_cache_sync_on_finish) {
+ for (plane = 0; plane < vb->num_planes; ++plane)
+ call_void_memop(vb, finish,
+ vb->planes[plane].mem_priv);
+ }
vb->synced = 0;
}

--
2.25.0.341.g760bfbb309-goog
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