media: imx-csi: Skip first few frames from a BT.656 source
[ Upstream commit e198be37e52551bb863d07d2edc535d0932a3c4f ] 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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -753,9 +753,10 @@ static int csi_setup(struct csi_priv *priv)
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static int csi_start(struct csi_priv *priv)
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static int csi_start(struct csi_priv *priv)
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{
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{
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struct v4l2_fract *output_fi;
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struct v4l2_fract *input_fi, *output_fi;
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int ret;
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int ret;
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input_fi = &priv->frame_interval[CSI_SINK_PAD];
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output_fi = &priv->frame_interval[priv->active_output_pad];
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output_fi = &priv->frame_interval[priv->active_output_pad];
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/* start upstream */
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/* start upstream */
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@ -764,6 +765,17 @@ static int csi_start(struct csi_priv *priv)
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if (ret)
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if (ret)
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return ret;
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return ret;
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/* Skip first few frames from a BT.656 source */
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if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) {
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u32 delay_usec, bad_frames = 20;
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delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC *
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input_fi->numerator * bad_frames,
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input_fi->denominator);
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usleep_range(delay_usec, delay_usec + 1000);
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}
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if (priv->dest == IPU_CSI_DEST_IDMAC) {
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if (priv->dest == IPU_CSI_DEST_IDMAC) {
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ret = csi_idmac_start(priv);
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ret = csi_idmac_start(priv);
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if (ret)
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if (ret)
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