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From a450dcfff0fb6882228bef9242a0c1afcef6337a Mon Sep 17 00:00:00 2001
From: David Plowman <david.plowman@raspberrypi.com>
Date: Thu, 28 May 2020 11:09:48 +0100
Subject: [PATCH] media: bcm2835-unicam: change minimum number of
vb2_queue buffers to 1
Since the unicam driver was modified to write to a dummy buffer when no
user-supplied buffer is available, it can now write to and return a
buffer even when there's only a single one. Enable this by changing the
min_buffers_needed in the vb2_queue; it will be useful for enabling
still captures without allocating more memory than absolutely necessary.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
---
drivers/media/platform/bcm2835/bcm2835-unicam.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -2428,7 +2428,7 @@ static int register_node(struct unicam_d
q->buf_struct_size = sizeof(struct unicam_buffer);
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
q->lock = &node->lock;
- q->min_buffers_needed = 2;
+ q->min_buffers_needed = 1;
q->dev = &unicam->pdev->dev;
ret = vb2_queue_init(q);
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