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f07e572f64
bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G bcm2710: boot tested on RPi 3B v1.2 bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
29 lines
1.2 KiB
Diff
29 lines
1.2 KiB
Diff
From 4f745137c92902f4f541ebe5e458dd2c4e89a42d Mon Sep 17 00:00:00 2001
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From: David Plowman <david.plowman@raspberrypi.com>
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Date: Thu, 28 May 2020 11:09:48 +0100
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Subject: [PATCH] media: bcm2835-unicam: change minimum number of
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vb2_queue buffers to 1
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Since the unicam driver was modified to write to a dummy buffer when no
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user-supplied buffer is available, it can now write to and return a
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buffer even when there's only a single one. Enable this by changing the
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min_buffers_needed in the vb2_queue; it will be useful for enabling
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still captures without allocating more memory than absolutely necessary.
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Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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---
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drivers/media/platform/bcm2835/bcm2835-unicam.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
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+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
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@@ -2387,7 +2387,7 @@ static int register_node(struct unicam_d
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q->buf_struct_size = sizeof(struct unicam_buffer);
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q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
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q->lock = &node->lock;
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- q->min_buffers_needed = 2;
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+ q->min_buffers_needed = 1;
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q->dev = &unicam->pdev->dev;
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ret = vb2_queue_init(q);
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