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SubjectRe: [PATCH v2 2/7] drm: ci: Force db410c to host mode
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Hi Dmitry, Maxime,

On 05/09/23 14:13, Maxime Ripard wrote:
> Hi,
>
> On Mon, Sep 04, 2023 at 07:59:26PM +0300, Dmitry Baryshkov wrote:
>> On Mon, 4 Sept 2023 at 19:16, Vignesh Raman <vignesh.raman@collabora.com> 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@collabora.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@78d9000 {
>>> + dr_mode = "host";
>>> + };
>>> + };
>>> + };
>>> +};
>>> --
>>> 2.40.1
>>
>> Can we use normal dtso syntax here instead of defining fragments manually?
>
> What Dmitry is hinting about is to use the "Sugar Syntax". There a good documentation here:
> https://source.android.com/docs/core/architecture/dto/syntax


With the below DTO syntax,
/dts-v1/;
/plugin/;

&usb {
usb@78d9000 {
dr_mode = "host";
};
};

Decoded dtbo file is,
/dts-v1/;

/ {

fragment@0 {
target = <0xffffffff>;

__overlay__ {

usb@78d9000 {
dr_mode = "host";
};
};
};

__fixups__ {
usb = "/fragment@0:target:0";
};
};

With the previous fix using fragment we get,
/ {

fragment@0 {
target-path = "/soc@0";

__overlay__ {

usb@78d9000 {
dr_mode = "host";
};
};
};
};

Decoded apq8016-sbc.dtb file with the fix (setting dr_mode to host) is,
/dts-v1/;
/ {
soc@0 {
usb@78d9000 {
dr_mode = "host";
};
};
};

How can set the target to "soc@0" using the DTO syntax? Otherwise
fdtoverlay fails to apply the dtbo file with the base dtb.

Regards,
Vignesh

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