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| author |   Steve Longerbeam <slongerbeam@gmail.com> | 2021-05-17 16:29:23 +0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-06-17 10:20:31 +0200 |
| commit | e198be37e52551bb863d07d2edc535d0932a3c4f (patch) | |
| tree | 49152379fbf0274212de16d0d6bb7f22e4d8c58d /drivers/staging/media/imx | |
| parent | media: coda: set debugfs blobs to read only (diff) | |
| download | linux-dev-e198be37e52551bb863d07d2edc535d0932a3c4f.tar.xz linux-dev-e198be37e52551bb863d07d2edc535d0932a3c4f.zip | |
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>
Diffstat (limited to 'drivers/staging/media/imx')
| -rw-r--r-- | drivers/staging/media/imx/imx-media-csi.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c index d2f1d40b2d5a..bb1305c9daaf 100644 --- a/drivers/staging/media/imx/imx-media-csi.c +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -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) |