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SubjectRe: [PATCH 1/4] media: imx: csi: Allow unknown nearest upstream entities
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On Sat, 2019-01-19 at 13:45 -0800, Steve Longerbeam wrote:
> 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
> ---
> 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 555aa45e02e3..b9af7d3d4974 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 &&

Will it work correctly if there's an external MUX connected to the CSI?

> + 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))

regards
Philipp

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