linux-kernel - Re: [PATCH v17 00/14] Add support for MT8195 SCP 2nd core

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Message-ID: <CAGXv+5Gj5rERcX6uxVUUq8beM4k4ogXnuh_86piyGw1oVrbyvg@mail.gmail.com>
Date:   Tue, 19 Sep 2023 13:07:26 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Laura Nao <laura.nao@...labora.com>, tinghan.shen@...iatek.com,
        angelogioacchino.delregno@...labora.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        andersson@...nel.org, conor+dt@...nel.org,
        devicetree@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org, matthias.bgg@...il.com,
        robh+dt@...nel.org, kernel@...labora.com
Subject: Re: [PATCH v17 00/14] Add support for MT8195 SCP 2nd core

On Tue, Sep 19, 2023 at 9:17 AM Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:
>
> On Mon, Sep 18, 2023 at 06:44:25PM +0800, Chen-Yu Tsai wrote:
> > On Mon, Sep 18, 2023 at 6:32 PM Laura Nao <laura.nao@...labora.com> wrote:
> > >
> > > > Other than patch 2 and 14, I have applied this set.  The remaining patches will
> > > > have to be resent to Matthias.
> > >
> > > > Thanks,
> > > > Mathieu
> > >
> > > Hello,
> > >
> > > With patch 2 missing, the SCP is not probed correctly anymore on asurada (MT8192) and kukui (MT8183). The mtk-scp driver relies on the existence of the `cros-ec-rpmsg` node in the dt to determine if the SCP is single or multicore. Without patch 2 the driver wrongly assumes the SCP on MT8192 and MT8183 are multicore, leading to the following errors during initialization:
> > >
> > > 10696 04:33:59.126671  <3>[   15.465714] platform 10500000.scp:cros-ec: invalid resource (null)
> > > 10697 04:33:59.142855  <3>[   15.478560] platform 10500000.scp:cros-ec: Failed to parse and map sram memory
> > > 10698 04:33:59.149650  <3>[   15.486121] mtk-scp 10500000.scp: Failed to initialize core 0 rproc
> > >
> > > The issue was caught by KernelCI, complete logs can be found here:
> > > - asurada: https://storage.kernelci.org/next/master/next-20230914/arm64/defconfig+arm64-chromebook+videodec/gcc-10/lab-collabora/baseline-nfs-mt8192-asurada-spherion-r0.html
> > > - kukui: https://storage.kernelci.org/next/master/next-20230914/arm64/defconfig+arm64-chromebook+videodec/gcc-10/lab-collabora/baseline-nfs-mt8183-kukui-jacuzzi-juniper-sku16.html
> > >
> > > Reporting the issue so that patch 2 and 14 can be resent and merged soon.
> >
> > This being a backward incompatible DT binding change, maybe we should revert
> > the node name change. Or, the driver could simply count the number of child
> > nodes that have the "mediatek,rpmsg-name" property, which is required.
> >
>
> You have a point.  Can someone send a patch that makes this patchset backward
> compatible?  Please do so as quickly as possible to that it can go in the next
> merge window with the rest of this feature.  Otherwize I'll have to back out the
> whole thing.

I sent out a patch [1] implementing my proposed change.

ChenYu

[1] https://lore.kernel.org/linux-remoteproc/20230919050305.3817347-1-wenst@chromium.org/