linux-kernel - Re: [PATCH] iommu/arm-smmu-qcom: Initialize SCTLR of the bypass context

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Date:   Thu,  7 Jan 2021 14:22:47 +0000
From:   Will Deacon <will@...nel.org>
To:     Joerg Roedel <joro@...tes.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] iommu/arm-smmu-qcom: Initialize SCTLR of the bypass context

On Tue, 5 Jan 2021 16:50:38 -0800, Bjorn Andersson wrote:
> On SM8150 it's occasionally observed that the boot hangs in between the
> writing of SMEs and context banks in arm_smmu_device_reset().
> 
> The problem seems to coincide with a display refresh happening after
> updating the stream mapping, but before clearing - and there by
> disabling translation - the context bank picked to emulate translation
> bypass.
> 
> [...]

Applied to arm64 (for-next/iommu/fixes), thanks!

[1/1] iommu/arm-smmu-qcom: Initialize SCTLR of the bypass context
      https://git.kernel.org/arm64/c/aded8c7c2b72

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev