linux-kernel - Re: [PATCH RESEND v2 4/5] iommu/tegra-smmu: Rework tegra_smmu_probe

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Date:   Thu, 4 Feb 2021 21:24:23 -0800
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>
Cc:     will@...nel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        jonathanh@...dia.com, vdumpa@...dia.com, thierry.reding@...il.com,
        joro@...tes.org, kernel@...labora.com,
        Dmitry Osipenko <digetx@...il.com>,
        "kernelci-results@...ups.io" <kernelci-results@...ups.io>
Subject: Re: [PATCH RESEND v2 4/5] iommu/tegra-smmu: Rework
 tegra_smmu_probe_device()

Hi Guillaume,

On Thu, Feb 04, 2021 at 11:10:15AM +0000, Guillaume Tucker wrote:
> Hi Nicolin,
> 
> A regression was detected by kernelci.org in IGT's drm_read tests
> on mainline, it was first seen on 17th December 2020.  You can
> find some details here:
> 
>   https://kernelci.org/test/case/id/600b82dc1e3208f123d3dffc/

Thanks for reporting the issue. We did test on Tegra210 and Tegra30
yet not on Tegra124. I am wondering what could go wrong...

> Please let us know if you need any help debugging this issue or
> to try a fix on this platform.

Yes, I don't have any Tegra124 platform to run. It'd be very nice
if you can run some debugging patch (I can provide you) and a fix
after I root cause the issue.

Thanks
Nicolin