linux-kernel - Re: [PATCH 1/1] iommu/arm-smmu: Implement qcom,skip-init

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Date:   Thu, 30 Jul 2020 22:48:50 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konradybcio@...il.com>
Cc:     Will Deacon <will@...nel.org>, skrzynka@...radybcio.pl,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH 1/1] iommu/arm-smmu: Implement qcom,skip-init

On Wed 22 Jul 13:11 PDT 2020, Konrad Dybcio wrote:

> >Is the problem on SDM630 that when you write to SMR/S2CR the device
> >reboots? Or that when you start writing out the context bank
> >configuration that trips the display and the device reboots?
> 
> I added some debug prints and the phone hangs after reaching the
> seventh CB (with i=6) at
> 
> arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_FSR, ARM_SMMU_FSR_FAULT);
> 
> line in arm_smmu_device_reset.
> 

Sounds like things are progressing nicely for a while there, presumably
until the next time the display is being refreshed.

Would you be willing to try out the following work in progress:
https://lore.kernel.org/linux-arm-msm/20200717001619.325317-1-bjorn.andersson@linaro.org/

You need to adjust drivers/iommu/arm-smmu-impl.c so that
arm_smmu_impl_init() will invoke qcom_smmu_impl_init() as it spots your
apps smmu.

Regards,
Bjorn