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>

diff --git a/drivers/media/platform/bcm2835/bcm2835-unicam.c b/drivers/media/platform/bcm2835/bcm2835-unicam.c
index b32b2d33a4e2f053e05a8a91486e34406d13dabc..e76323af0952f590c05b7575e4696a059f1c13f3 100644 (file)
--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
@@ -2404,7 +2404,7 @@ static int register_node(struct unicam_device *unicam, struct unicam_node *node,
        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);