On Tue Oct 29 14:47:05 2024 +0200, Tomi Valkeinen wrote:
> The driver checks if "vq->max_num_buffers + *nbuffers < 3", but
> vq->max_num_buffers is (by default) 32, so the check is never true. Nor
> does the check make sense.
>
> The original code in the BSP kernel was "vq->num_buffers + *nbuffers <
> 3", but got mangled along the way to upstream. The intention was to make
> sure that at least 3 buffers are allocated.
>
> Fix this by removing the bad lines and setting q->min_reqbufs_allocation
> to three.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkei...@ideasonboard.com>
> Reviewed-by: Hans Verkuil <hverk...@xs4all.nl>
> Signed-off-by: Hans Verkuil <hverk...@xs4all.nl>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/platform/raspberrypi/rp1-cfe/cfe.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/drivers/media/platform/raspberrypi/rp1-cfe/cfe.c
b/drivers/media/platform/raspberrypi/rp1-cfe/cfe.c
index fcadb2143c88..62dca76b468d 100644
--- a/drivers/media/platform/raspberrypi/rp1-cfe/cfe.c
+++ b/drivers/media/platform/raspberrypi/rp1-cfe/cfe.c
@@ -1024,9 +1024,6 @@ static int cfe_queue_setup(struct vb2_queue *vq, unsigned
int *nbuffers,
cfe_dbg(cfe, "%s: [%s] type:%u\n", __func__, node_desc[node->id].name,
node->buffer_queue.type);
- if (vq->max_num_buffers + *nbuffers < 3)
- *nbuffers = 3 - vq->max_num_buffers;
-
if (*nplanes) {
if (sizes[0] < size) {
cfe_err(cfe, "sizes[0] %i < size %u\n", sizes[0], size);
@@ -1998,6 +1995,7 @@ static int cfe_register_node(struct cfe_device *cfe, int
id)
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->lock = &node->lock;
q->min_queued_buffers = 1;
+ q->min_reqbufs_allocation = 3;
q->dev = &cfe->pdev->dev;
ret = vb2_queue_init(q);
