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SubjectRe: [PATCH 1/9] dt-bindings: display: renesas,du: Document r8a774e1 bindings
Hello,

On Thu, Aug 13, 2020 at 11:38:03AM +0100, Lad, Prabhakar wrote:
> On Thu, Aug 13, 2020 at 10:05 AM Geert Uytterhoeven wrote:
> > On Wed, Aug 12, 2020 at 4:02 PM Lad Prabhakar wrote:
> > > From: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
> > >
> > > Document the RZ/G2H (a.k.a. r8a774e1) SoC in the R-Car DU bindings.
> > >
> > > Signed-off-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > ---
> > > Documentation/devicetree/bindings/display/renesas,du.txt | 2 ++
> > > 1 file changed, 2 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/renesas,du.txt b/Documentation/devicetree/bindings/display/renesas,du.txt
> > > index 51cd4d162770..67cded5ad827 100644
> > > --- a/Documentation/devicetree/bindings/display/renesas,du.txt
> > > +++ b/Documentation/devicetree/bindings/display/renesas,du.txt
> > > @@ -10,6 +10,7 @@ Required Properties:
> > > - "renesas,du-r8a774a1" for R8A774A1 (RZ/G2M) compatible DU
> > > - "renesas,du-r8a774b1" for R8A774B1 (RZ/G2N) compatible DU
> > > - "renesas,du-r8a774c0" for R8A774C0 (RZ/G2E) compatible DU
> > > + - "renesas,du-r8a774e1" for R8A774E1 (RZ/G2H) compatible DU
> > > - "renesas,du-r8a7779" for R8A7779 (R-Car H1) compatible DU
> > > - "renesas,du-r8a7790" for R8A7790 (R-Car H2) compatible DU
> > > - "renesas,du-r8a7791" for R8A7791 (R-Car M2-W) compatible DU
> > > @@ -75,6 +76,7 @@ corresponding to each DU output.
> > > R8A774A1 (RZ/G2M) DPAD 0 HDMI 0 LVDS 0 -
> > > R8A774B1 (RZ/G2N) DPAD 0 HDMI 0 LVDS 0 -
> > > R8A774C0 (RZ/G2E) DPAD 0 LVDS 0 LVDS 1 -
> > > + R8A774E1 (RZ/G2H) DPAD 0 HDMI 0 LVDS 0 -
> >
> > As LVDS 0 is the fourth channel (DU3), should it be listed under port 3
> > instead of port 2?
> >
> > I know we did it the same for R-Car M3-N and RZ/G2N.
> > But my main worry is adding support for R-Car H3-N later.

Why should we do so ? The port number here isn't tied to the DU channel
number. It only identifies the output port. Many DUs can route DU
channel outputs to different output ports.

> I do agree too, with the below diff I tested the LVDS output on RZ/G2N
> Rev2 board and things work fine. But only thing it doesn't explain is
> why does LVDS work on DU2 for G2[H/N] boards :D
>
> Geert, Laurent, Kieran If you agree with the below changes I shall
> post a proper patch fixing it for RZ/G2[HN]
>
> diff --git a/arch/arm64/boot/dts/renesas/r8a774b1.dtsi
> b/arch/arm64/boot/dts/renesas/r8a774b1.dtsi
> index d661724fc28a..0b087d287202 100644
> --- a/arch/arm64/boot/dts/renesas/r8a774b1.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a774b1.dtsi
> @@ -2540,8 +2540,8 @@
> remote-endpoint =
> <&dw_hdmi0_in>;
> };
> };
> - port@2 {
> - reg = <2>;
> + port@3 {
> + reg = <3>;
> du_out_lvds0: endpoint {
> remote-endpoint = <&lvds0_in>;
> };
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index 3e67cf70f040..419d81c7763e 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -153,7 +153,7 @@ static const struct rcar_du_device_info
> rcar_du_r8a774b1_info = {
> },
> [RCAR_DU_OUTPUT_LVDS0] = {
> .possible_crtcs = BIT(0),
> - .port = 2,
> + .port = 3,
> },
> },
> .num_lvds = 1,
>
> > > R8A7779 (R-Car H1) DPAD 0 DPAD 1 - -
> > > R8A7790 (R-Car H2) DPAD 0 LVDS 0 LVDS 1 -
> > > R8A7791 (R-Car M2-W) DPAD 0 LVDS 0 - -
> >
> > Apart from that:
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

--
Regards,

Laurent Pinchart

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