linux-kernel - Re: [PATCH v2 2/7] drm: ci: Force db410c to host mode

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Date:   Wed, 6 Sep 2023 09:55:40 -0300
From:   Helen Koike <helen.koike@...labora.com>
To:     Vignesh Raman <vignesh.raman@...labora.com>,
        dri-devel@...ts.freedesktop.org
Cc:     guilherme.gallo@...labora.com, sergi.blanch.torne@...labora.com,
        david.heidelberg@...labora.com, daniels@...labora.com,
        gustavo.padovan@...labora.com, emma@...olt.net,
        robclark@...edesktop.org, robdclark@...gle.com, anholt@...gle.com,
        robdclark@...il.com, airlied@...il.com, daniel@...ll.ch,
        jani.nikula@...ux.intel.com, mripard@...nel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/7] drm: ci: Force db410c to host mode

Hi!

On 04/09/2023 13:15, Vignesh Raman wrote:
> Force db410c to host mode to fix network issue which results in failure
> to mount root fs via NFS.
> See https://gitlab.freedesktop.org/gfx-ci/linux/-/commit/cb72a629b8c15c80a54dda510743cefd1c4b65b8
> 
> Use fdtoverlay command to merge base device tree with an overlay
> which contains the fix for USB controllers to work in host mode.
> 
> Signed-off-by: Vignesh Raman <vignesh.raman@...labora.com>
> ---
> 
> v2:
>    - Use fdtoverlay command to merge overlay dtbo with the base dtb instead of modifying the kernel sources
>    
> ---
>   drivers/gpu/drm/ci/build.sh                         |  5 +++++
>   .../gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts  | 13 +++++++++++++
>   2 files changed, 18 insertions(+)
>   create mode 100644 drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
> 
> diff --git a/drivers/gpu/drm/ci/build.sh b/drivers/gpu/drm/ci/build.sh
> index 7b014287a041..92ffd98cd09e 100644
> --- a/drivers/gpu/drm/ci/build.sh
> +++ b/drivers/gpu/drm/ci/build.sh
> @@ -92,6 +92,11 @@ done
>   
>   if [[ -n ${DEVICE_TREES} ]]; then
>       make dtbs
> +    if [[ -e arch/arm64/boot/dts/qcom/apq8016-sbc.dtb ]]; then
> +        dtc -@ -I dts -O dtb -o drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dtbo drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
> +        fdtoverlay -i arch/arm64/boot/dts/qcom/apq8016-sbc.dtb -o arch/arm64/boot/dts/qcom/apq8016-sbc-overlay.dtb drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dtbo
> +        mv arch/arm64/boot/dts/qcom/apq8016-sbc-overlay.dtb arch/arm64/boot/dts/qcom/apq8016-sbc.dtb
> +    fi
>       cp ${DEVICE_TREES} /lava-files/.
>   fi
>   
> diff --git a/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts b/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
> new file mode 100644
> index 000000000000..57b7604f1c23
> --- /dev/null
> +++ b/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
> @@ -0,0 +1,13 @@
> +/dts-v1/;
> +/plugin/;
> +
> +/ {
> +    fragment@0 {
> +        target-path = "/soc@0";
> +        __overlay__ {
> +            usb@...9000 {
> +                dr_mode = "host";
> +            };
> +        };
> +    };
> +};


Another thing that I was discussing with David and Vignesh, since we 
will need this overlay spinets not only for drm-ci but also for mesa ci 
(and every body who uses the farms), would it be interesting to move it 
to some place more official? like dts folders? Or would that be against 
Linux policy?


Regards,
Helen