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

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Date:   Thu, 1 Apr 2021 01:55:49 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Dmitry Osipenko <digetx@...il.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, guillaume.tucker@...labora.com
Subject: Re: [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was
 needed for Nyan Big Chromebook

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.