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media: rkisp1: Reduce min_queued_buffers to 1

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There apparently is no reason to require 3 queued buffers to call
streamon() for the RkISP1 as the driver operates with a scratch buffer
where frames can be directed to if there's no available buffer provided
by userspace.

Reduce the number of required buffers to 1 to allow applications to
operate with a single queued buffer.

Tested with libcamera, by operating with a single capture request. The
same request (and associated capture buffer) gets recycled once
completed. This of course causes a frame rate drop but doesn't hinder
operations.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20241007124225.63463-1-jacopo.mondi@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Jacopo Mondi 2024-10-07 14:42:24 +02:00 committed by Mauro Carvalho Chehab
parent 86e5e8efb8
commit 6c10d1adae
1 changed files with 1 additions and 3 deletions
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4
drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
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@ -35,8 +35,6 @@
#define RKISP1_SP_DEV_NAME RKISP1_DRIVER_NAME "_selfpath"
#define RKISP1_MP_DEV_NAME RKISP1_DRIVER_NAME "_mainpath"
#define RKISP1_MIN_BUFFERS_NEEDED 3
enum rkisp1_plane {
RKISP1_PLANE_Y = 0,
RKISP1_PLANE_CB = 1,
@ -1561,7 +1559,7 @@ static int rkisp1_register_capture(struct rkisp1_capture *cap)
q->ops = &rkisp1_vb2_ops;
q->mem_ops = &vb2_dma_contig_memops;
q->buf_struct_size = sizeof(struct rkisp1_buffer);
q->min_queued_buffers = RKISP1_MIN_BUFFERS_NEEDED;
q->min_queued_buffers = 1;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->lock = &node->vlock;
q->dev = cap->rkisp1->dev;