[media] tw686x: Specify that the DMA is 32 bits

Set vb2_queue.gfp_flags to GFP_DMA32. Otherwise it will start to create bounce buffers which is something you want to avoid since those are in limited supply. Without this patch, DMA scatter-gather may not work because machines can ran out of buffers easily. Signed-off-by: Ezequiel Garcia <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
josf · Apr 20, 2016 · 1c9f471 · 1c9f471
1 parent e3a900a
commit 1c9f471
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c
@@ -848,6 +848,7 @@ int tw686x_video_init(struct tw686x_dev *dev)
 		vc->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
 		vc->vidq.min_buffers_needed = 2;
 		vc->vidq.lock = &vc->vb_mutex;
+		vc->vidq.gfp_flags = GFP_DMA32;
 
 		err = vb2_queue_init(&vc->vidq);
 		if (err) {