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media: imx-csi: Skip first few frames from a BT.656 source 

Some BT.656 sensors (e.g. ADV718x) transmit frames with unstable BT.656
sync codes after initial power on. This confuses the imx CSI,resulting
in vertical and/or horizontal sync issues. Skip the first 20 frames
to avoid the unstable sync codes.

[fabio: fixed checkpatch warning and increased the frame skipping to 20]

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Steve Longerbeam 2021-05-17 16:29:23 +02:00 committed by Mauro Carvalho Chehab
parent ca816468bc
commit e198be37e5
1 changed files with 13 additions and 1 deletions
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14
drivers/staging/media/imx/imx-media-csi.c
View File

@ -750,9 +750,10 @@ static int csi_setup(struct csi_priv *priv)
static int csi_start(struct csi_priv *priv)
{
struct v4l2_fract *output_fi;
struct v4l2_fract *input_fi, *output_fi;
int ret;
input_fi = &priv->frame_interval[CSI_SINK_PAD];
output_fi = &priv->frame_interval[priv->active_output_pad];
/* start upstream */
@ -761,6 +762,17 @@ static int csi_start(struct csi_priv *priv)
if (ret)
return ret;
/* Skip first few frames from a BT.656 source */
if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) {
u32 delay_usec, bad_frames = 20;
delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC *
input_fi->numerator * bad_frames,
input_fi->denominator);
usleep_range(delay_usec, delay_usec + 1000);
}
if (priv->dest == IPU_CSI_DEST_IDMAC) {
ret = csi_idmac_start(priv);
if (ret)