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Subject: media: imx: csi: Allow unknown nearest upstream entities Author: Steve Longerbeam slongerbeam@gmail.com Date: Wed Feb 20 18:53:29 2019 -0500

On i.MX6, the nearest upstream entity to the CSI can only be the CSI video muxes or the Synopsys DW MIPI CSI-2 receiver.

However the i.MX53 has no CSI video muxes or a MIPI CSI-2 receiver. So allow for the nearest upstream entity to the CSI to be something other than those.

Fixes: bf3cfaa712e5c ("media: staging/imx: get CSI bus type from nearest upstream entity")

Signed-off-by: Steve Longerbeam slongerbeam@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/staging/media/imx/imx-media-csi.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)

---

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c index 3b7517348666..41965d8b56c4 100644 --- a/drivers/staging/media/imx/imx-media-csi.c +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -154,9 +154,10 @@ static inline bool requires_passthrough(struct v4l2_fwnode_endpoint *ep, /* * Parses the fwnode endpoint from the source pad of the entity * connected to this CSI. This will either be the entity directly - * upstream from the CSI-2 receiver, or directly upstream from the - * video mux. The endpoint is needed to determine the bus type and - * bus config coming into the CSI. + * upstream from the CSI-2 receiver, directly upstream from the + * video mux, or directly upstream from the CSI itself. The endpoint + * is needed to determine the bus type and bus config coming into + * the CSI. */ static int csi_get_upstream_endpoint(struct csi_priv *priv, struct v4l2_fwnode_endpoint *ep) @@ -172,7 +173,8 @@ static int csi_get_upstream_endpoint(struct csi_priv *priv, if (!priv->src_sd) return -EPIPE;

- src = &priv->src_sd->entity; + sd = priv->src_sd; + src = &sd->entity;

if (src->function == MEDIA_ENT_F_VID_MUX) { /* @@ -186,6 +188,14 @@ static int csi_get_upstream_endpoint(struct csi_priv *priv, src = &sd->entity; }

+ /* + * If the source is neither the video mux nor the CSI-2 receiver, + * get the source pad directly upstream from CSI itself. + */ + if (src->function != MEDIA_ENT_F_VID_MUX && + sd->grp_id != IMX_MEDIA_GRP_ID_CSI2) + src = &priv->sd.entity; + /* get source pad of entity directly upstream from src */ pad = imx_media_find_upstream_pad(priv->md, src, 0); if (IS_ERR(pad))