linux-kernel - Re: [PATCH 2/6] drm: ci: Force db410c to host mode

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Date:   Fri, 25 Aug 2023 15:09:04 +0100
From:   "Helen Mae Koike Fornazier" <helen.koike@...labora.com>
To:     "Jani Nikula" <jani.nikula@...ux.intel.com>
Cc:     "Vignesh Raman" <vignesh.raman@...labora.com>,
        dri-devel@...ts.freedesktop.org, emma@...olt.net,
        linux-doc@...r.kernel.org, david.heidelberg@...labora.com,
        linux-amlogic@...ts.infradead.org, jbrunet@...libre.com,
        robdclark@...gle.com, corbet@....net, khilman@...libre.com,
        sergi.blanch.torne@...labora.com, gustavo.padovan@...labora.com,
        linux-rockchip@...ts.infradead.org, daniels@...labora.com,
        martin.blumenstingl@...glemail.com, robclark@...edesktop.org,
        anholt@...gle.com, linux-mediatek@...ts.infradead.org,
        mripard@...nel.org, matthias.bgg@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        angelogioacchino.delregno@...labora.com, neil.armstrong@...aro.org,
        guilherme.gallo@...labora.com, linux-kernel@...r.kernel.org,
        tzimmermann@...e.de
Subject: Re: [PATCH 2/6] drm: ci: Force 
 db410c to host mode

Hi Jani, thanks for your comments

On Friday, August 25, 2023 10:56 -03, Jani Nikula <jani.nikula@...ux.intel.com> wrote:

> On Fri, 25 Aug 2023, Vignesh Raman <vignesh.raman@...labora.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
> >
> > Since this fix is not sent upstream, add it to build.sh script
> > before building the kernel and dts. Better approach would be
> > to use devicetree overlays.
> >
> > Signed-off-by: Vignesh Raman <vignesh.raman@...labora.com>
> > ---
> >  drivers/gpu/drm/ci/build.sh | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/ci/build.sh b/drivers/gpu/drm/ci/build.sh
> > index 7b014287a041..c39834bd6bd7 100644
> > --- a/drivers/gpu/drm/ci/build.sh
> > +++ b/drivers/gpu/drm/ci/build.sh
> > @@ -70,6 +70,10 @@ if [ -z "$CI_MERGE_REQUEST_PROJECT_PATH" ]; then
> >      fi
> >  fi
> >  
> > +# 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
> > +sed -i '/&usb {/,/status = "okay";/s/status = "okay";/&\n\tdr_mode = "host";/' arch/arm64/boot/dts/qcom/apq8016-sbc.dts
> > +
> 
> It seems like a really bad idea to me to have the CI build modify the
> source tree before building.
> 
> The kernel being built will have a dirty git repo, and the localversion
> will have -dirty in it.

Is it bad?

The other option was to work with device tree overlays (but we still need to spend some time to
see how to fit it all together)

> 
> I think it would be better to do out-of-tree builds and assume the
> source is read-only.

I'm not sure I get what do you call out-of-tree builds.

Another option would be to apply .patch file, or to have another branch
just with fix ups for ci that would be applied in the tree before building.

> 
> >  for opt in $ENABLE_KCONFIGS; do
> >    echo CONFIG_$opt=y >> drivers/gpu/drm/ci/${KERNEL_ARCH}.config
> >  done
> 
> Ditto for the config changes in the context here. Those are files in
> git, don't change them.

Probably these changes could go directly into drivers/gpu/drm/ci/${KERNEL_ARCH}.config
files, no need to modify them on the fly here

> 
> Shouldn't this use something like 'scripts/config --enable' or
> 'scripts/config --disable' on the .config file to be used for building
> instead?

I wasn't aware about this possibility, looks cleaner indeed.

Regards,
Helen

> 
> 
> BR,
> Jani.
> 
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center