Re: [PATCH 02/13] arm64: dts: qcom: apq8016-sbc: Fix CSI-2 lanes routing

[Loic Poulain <loic.poulain@linaro.org>]

On Fri, 17 Jul 2020 at 21:35, Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Jacopo,
>
> On Fri, Jul 17, 2020 at 03:28:48PM +0200, Jacopo Mondi wrote:
> > The ov5640 sensor does not support lanes reconfiguration according
> > to version of the datasheet I have (version 2.03) and the driver
> > does not parse the properties to try to reconfigure them.
> >
> > Fix the properties values in the camera and cci node.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > ---
> > Loic, I see you added the camera nodes in
> > 39e0ce6cd1bf ("arm64: dts: qcom: apq8016-sbc: Add CCI/Sensor nodes")
> >
> > Do you have any idea how lanes could be swapped if, from my understanding,
> > nor the sensor nor the driver supports that ?
>
> It's not supported on the OV5640 side, so I think the second hunk of
> this patch is correct, but I believe that the CAMSS supports lane
> reordering, so the first hunk is likely incorrect and should be dropped.

Indeed, camss supports lane configuration (cf camss_of_parse_endpoint_node).
The sensor doesn't, so that can be removed on its side.

Regards,
Loic

>
> > ---
> >  arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> > index 8a4b790aa7ff..fe6613676e45 100644
> > --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> > @@ -591,8 +591,8 @@ ports {
> >               port@0 {
> >                       reg = <0>;
> >                       csiphy0_ep: endpoint {
> > -                             clock-lanes = <1>;
> > -                             data-lanes = <0 2>;
> > +                             clock-lanes = <0>;
> > +                             data-lanes = <1 2>;
> >                               remote-endpoint = <&ov5640_ep>;
> >                               status = "okay";
> >                       };
> > @@ -627,8 +627,8 @@ camera_rear@3b {
> >
> >               port {
> >                       ov5640_ep: endpoint {
> > -                             clock-lanes = <1>;
> > -                             data-lanes = <0 2>;
> > +                             clock-lanes = <0>;
> > +                             data-lanes = <1 2>;
> >                               remote-endpoint = <&csiphy0_ep>;
> >                       };
> >               };
>
> --
> Regards,
>
> Laurent Pinchart