On Thu Mar 12 11:12:34 2026 +0800, Guoniu Zhou wrote:
> Fix a hang issue when capturing a single frame with applications like cam
> in libcamera. It would hang waiting for the driver to complete the buffer,
> but streaming never starts because min_queued_buffers was set to 2.
>
> The ISI module uses a ping-pong buffer mechanism that requires two buffers
> to be programmed at all times. However, when fewer than 2 user buffers are
> available, the driver use internal discard buffers to fill the remaining
> slot(s). Reduce minimum queued buffers from 2 to 0 allows streaming to
> start without any queued buffers.
>
> Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
> Cc: [email protected]
> Signed-off-by: Guoniu Zhou <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> Link:
> https://patch.msgid.link/[email protected]
> Signed-off-by: Laurent Pinchart <[email protected]>
> Signed-off-by: Hans Verkuil <[email protected]>
Patch committed.
Thanks,
Hans Verkuil
drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
index 13682bf6e9f8..1be3a728f32f 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-video.c
@@ -1410,7 +1410,7 @@ int mxc_isi_video_register(struct mxc_isi_pipe *pipe,
q->mem_ops = &vb2_dma_contig_memops;
q->buf_struct_size = sizeof(struct mxc_isi_buffer);
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
- q->min_queued_buffers = 2;
+ q->min_queued_buffers = 0;
q->lock = &video->lock;
q->dev = pipe->isi->dev;
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