6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hans Verkuil hverkuil-cisco@xs4all.nl
[ Upstream commit 350ab13e1382f2afcc2285041a1e75b80d771c2c ]
The vb2 read support requests 1 buffer, leaving it to the driver to increase this number to something that works.
Unfortunately, drivers do not deal with this reliably, and in fact this caused problems for the bttv driver and reading from /dev/vbiX, causing every other VBI frame to be all 0.
Instead, request as the number of buffers whatever is the maximum of 2 and q->min_buffers_needed+1.
In order to start streaming you need at least q->min_buffers_needed queued buffers, so add 1 buffer for processing. And if that field is 0, then choose 2 (again, one buffer is being filled while the other one is being processed).
This certainly makes more sense than requesting just 1 buffer, and the VBI bttv support is now working again.
It turns out that the old videobuf1 behavior of bttv was to allocate 8 (video) and 4 (vbi) buffers when used with read(). After the vb2 conversion that changed to 2 for both. With this patch it is 3, which is really all you need.
Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Fixes: b7ec3212a73a ("media: bttv: convert to vb2") Tested-by: Dr. David Alan Gilbert dave@treblig.org Signed-off-by: Mauro Carvalho Chehab mchehab@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/common/videobuf2/videobuf2-core.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index cf6727d9c81f3..468191438849e 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -2648,9 +2648,14 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) return -EBUSY;
/* - * Start with count 1, driver can increase it in queue_setup() + * Start with q->min_buffers_needed + 1, driver can increase it in + * queue_setup() + * + * 'min_buffers_needed' buffers need to be queued up before you + * can start streaming, plus 1 for userspace (or in this case, + * kernelspace) processing. */ - count = 1; + count = max(2, q->min_buffers_needed + 1);
dprintk(q, 3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n", (read) ? "read" : "write", count, q->fileio_read_once,