linux-kernel - Re: [PATCH] soc: mediatek: mtk-svs: Enable the IRQ later

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Date:   Tue, 20 Dec 2022 21:44:06 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>
Cc:     Roger Lu (陸瑞傑) <Roger.Lu@...iatek.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] soc: mediatek: mtk-svs: Enable the IRQ later

Hi Roger

Thanks for the heads up.

This is the tree that I am using to test this:
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3918592/7
( https://chromium.googlesource.com/chromiumos/third_party/kernel/+/3daf57d76c9e3d7c73d038ff2e43984412b503a2
)

You can use this tool for kexec:
https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3953579

The syntax is kexec-lite  --reboot --kernel /boot/Image --cmdline
"$(cat /proc/cmdline)"

On Tue, 20 Dec 2022 at 15:50, Matthias Brugger <matthias.bgg@...il.com> wrote:
>
>
>
> On 20/12/2022 12:03, Roger Lu (陸瑞傑) wrote:
> > Hi Matthias Sir,
> >
> > After applying this patch, SVS probes fail as below on my MT8192 platform. If
> > thing isn't too late, please do not merge this patch. I'll ask Ricardo how to
> > reproduce this issue and give the correct solution. Thanks in advance.
> >
>
> Ok, I just dropped the patch from v6.2-tmp/soc branch.
>
> Regards,
> Matthias
>
> > #MT8192 platform SVS probe fail log
> > [   10.209430]  SVSB_GPU_LOW: init02 completion timeout
> > [   10.214402] mtk-svs 1100b000.svs: svs start fail: -16
> > [   10.219479] mtk-svs: probe of 1100b000.svs failed with error -16
> >
> > Hi Ricardo,
> >
> > Could you share us how you reproduce this issue? I have MT8192 Chromebook and
> > can give it a try to reproduce the issue you encountered. Thanks a lot.
> >
> > Sincerely,
> > Roger Lu.
> >
> > On Fri, 2022-12-16 at 13:47 +0100, Matthias Brugger wrote:
> >>
> >> On 30/11/2022 12:00, AngeloGioacchino Del Regno wrote:
> >> > Il 27/11/22 21:22, Ricardo Ribalda ha scritto:
> >> > > If the system does not come from reset (like when is booted via
> >> > > kexec()), the peripheral might triger an IRQ before the data structures
> >> > > are initialised.
> >> > >
> >> > > Fixes:
> >> > >
> >> > > [    0.227710] Unable to handle kernel NULL pointer dereference at
> >> > > virtual
> >> > > address 0000000000000f08
> >> > > [    0.227913] Call trace:
> >> > > [    0.227918]  svs_isr+0x8c/0x538
> >> > >
> >> > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> >> >
> >> > Reviewed-by: AngeloGioacchino Del Regno <
> >> > angelogioacchino.delregno@...labora.com>
> >> >
> >> >
> >>
> >> Applied thanks!
> >>
> >
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-- 
Ricardo Ribalda