linux-kernel - Re: [PATCH 4/5] iommu/arm-smmu-qcom: Consstently initialize stream mappings

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Message-ID: <20200709073204.GH34333@vkoul-mobl>
Date:   Thu, 9 Jul 2020 13:02:04 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jonathan Marek <jonathan@...ek.ca>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 4/5] iommu/arm-smmu-qcom: Consstently initialize stream
 mappings

On 08-07-20, 22:01, Bjorn Andersson wrote:
> Firmware that traps writes to S2CR to translate BYPASS into FAULT also
> ignores writes of type FAULT. As such booting with "disable_bypass" set
> will result in all S2CR registers left as configured by the bootloader.
> 
> This has been seen to result in indeterministic results, as these
> mappings might linger and reference context banks that Linux is
> reconfiguring.
> 
> Use the fact that BYPASS writes result in FAULT type to force all stream
> mappings to FAULT.

s/Consstently/Consistently in patch subject

-- 
~Vinod