linux-kernel - Re: [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was needed for Nyan Big Chromebook

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Date:   Fri, 2 Apr 2021 17:40:55 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>,
        guillaume.tucker@...labora.com
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Krishna Reddy <vdumpa@...dia.com>,
        Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was
 needed for Nyan Big Chromebook

01.04.2021 11:55, Nicolin Chen пишет:
> On Mon, Mar 29, 2021 at 02:32:56AM +0300, Dmitry Osipenko wrote:
>> The previous commit fixes problem where display client was attaching too
>> early to IOMMU during kernel boot in a multi-platform kernel configuration
>> which enables CONFIG_ARM_DMA_USE_IOMMU=y. The workaround that helped to
>> defer the IOMMU attachment for Nyan Big Chromebook isn't needed anymore,
>> revert it.
> 
> Sorry for the late reply. I have been busy with downstream tasks.
> 
> I will give them a try by the end of the week. Yet, probably it'd
> be better to include Guillaume also as he has the Nyan platform.
> 

Indeed, thanks. Although, I'm pretty sure that it's the same issue which
I reproduced on Nexus 7.

Guillaume, could you please give a test to these patches on Nyan Big?
There should be no EMEM errors in the kernel log with this patches.

https://patchwork.ozlabs.org/project/linux-tegra/list/?series=236215