Re: [PATCH v3 3/9] drm: ci: Force db410c to host mode

[Maxime Ripard]

On Fri, Sep 08, 2023 at 08:52:19PM +0530, 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
> 
> Compile the base device tree with overlay support and use fdtoverlay
> command to merge base device tree with an overlay which contains the
> fix for USB controllers to work in host mode. [suggested by Maxime Ripard]
> 
> Suggested-by: Maxime Ripard <mripard@xxxxxxxxxx>
> Signed-off-by: Vignesh Raman <vignesh.raman@xxxxxxxxxxxxx>
> ---
> 
> v2:
>   - Use fdtoverlay command to merge overlay dtbo with the base dtb instead of modifying the kernel sources
> 
> v3:
>   - drm-ci scripts to use device tree overlay from arch/arm64/boot/dts/qcom and compile base device tree with overlay support
> 
> ---
>  drivers/gpu/drm/ci/build.sh | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/ci/build.sh b/drivers/gpu/drm/ci/build.sh
> index 7b014287a041..092c195af242 100644
> --- a/drivers/gpu/drm/ci/build.sh
> +++ b/drivers/gpu/drm/ci/build.sh
> @@ -91,7 +91,12 @@ for image in ${KERNEL_IMAGE_NAME}; do
>  done
>  
>  if [[ -n ${DEVICE_TREES} ]]; then
> -    make dtbs
> +    make DTC_FLAGS=-@ dtbs
> +    if [[ -e arch/arm64/boot/dts/qcom/apq8016-sbc.dtb ]]; then
> +        dtc -@ -I dts -O dtb -o arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtbo arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtso

You don't need to compile it by hand, make dtbs should do it for you

> +        fdtoverlay -i arch/arm64/boot/dts/qcom/apq8016-sbc.dtb -o arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtb arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtbo
> +        mv arch/arm64/boot/dts/qcom/apq8016-sbc-usb-host.dtb arch/arm64/boot/dts/qcom/apq8016-sbc.dtb
> +    fi

That is also supported by the build system already, see
k3-am642-tqma64xxl-mbax4xxl-sdcard-dtbs in
arch/arm64/boot/dts/ti/Makefile for example.

Maxime

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