Hello Jacopo,
> From: linux-renesas-soc-ow...@vger.kernel.org
> <linux-renesas-soc-ow...@vger.kernel.org> On Behalf Of Laurent Pinchart
> Sent: 28 May 2019 15:13
> Subject: [PATCH v3 10/10] [HACK] arm64: dts: renesas: ebisu: Enable LVDS
> dual-link operation
>
> Enable and connect the second LVDS encoder to the second LVDS input of
> the THC63LVD1024 for dual-link LVDS operation. This requires changing
> the default settings of SW45 and SW47 to OFF and ON respectively.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
> Tested-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
How did you test this patch on Ebisu (kernel branch, configuration,
switches,etc.)?
I tested both linux-next and drm/du/lvds/dual-link and they are not working for
me.
The base configuration I am using is coming from arch/arm64/configs/defconfig
from each respective branch, on top of that I am enabling the remaining bits
and pieces.
I have tried the suggested configuration of the switches for this patch,
basically nothing is happening. I have also tried reverting the changes made by
this patch (on both branches), and of course I have reverted the selection for
the switches as well, and even single-link doesn't work for me. Single-link
support from the BSP version of the kernel (4.14.75-ltsi) works for me, that
confirms the configuration of the switches I am using when testing single-link
should be okay.
If, in the single-link use case from drm/du/lvds/dual-link, I connect lvds1 to
the vga-encoder in the DT (like for the BSP DT, but I can see from the
schematics that ADV7123 is actually connected to DU, like the configuration in
the DT upstream), then HDMI works as expected (most of the time).
I wonder if for some reason we may end up using the wrong lvds encoder at
times, or no encoder at all?
Have you seen this problem? Am I missing something obvious here?
Thanks,
Fab
> ---
> .../arm64/boot/dts/renesas/r8a77990-ebisu.dts | 24 +++++++++++++------
> 1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> b/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> index c72772589953..988d82609f41 100644
> --- a/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> +++ b/arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts
> @@ -93,11 +93,18 @@
>
> port@0 {
> reg = <0>;
> - thc63lvd1024_in: endpoint {
> + thc63lvd1024_in0: endpoint {
> remote-endpoint = <&lvds0_out>;
> };
> };
>
> + port@1 {
> + reg = <1>;
> + thc63lvd1024_in1: endpoint {
> + remote-endpoint = <&lvds1_out>;
> + };
> + };
> +
> port@2 {
> reg = <2>;
> thc63lvd1024_out: endpoint {
> @@ -482,24 +489,27 @@
> ports {
> port@1 {
> lvds0_out: endpoint {
> - remote-endpoint = <&thc63lvd1024_in>;
> + remote-endpoint = <&thc63lvd1024_in0>;
> };
> };
> };
> };
>
> &lvds1 {
> - /*
> - * Even though the LVDS1 output is not connected, the encoder must be
> - * enabled to supply a pixel clock to the DU for the DPAD output when
> - * LVDS0 is in use.
> - */
> status = "okay";
>
> clocks = <&cpg CPG_MOD 727>,
> <&x13_clk>,
> <&extal_clk>;
> clock-names = "fck", "dclkin.0", "extal";
> +
> + ports {
> + port@1 {
> + lvds1_out: endpoint {
> + remote-endpoint = <&thc63lvd1024_in1>;
> + };
> + };
> + };
> };
>
> &ohci0 {
> --
> Regards,
>
> Laurent Pinchart
