linux-kernel - Re: [PATCH v2] arm64: dts: sdm845: Add iommus property to qup

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Date:   Mon, 23 Nov 2020 22:44:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: sdm845: Add iommus property to qup

On 21-11-20, 19:41, Bjorn Andersson wrote:
> From: Stephen Boyd <swboyd@...omium.org>
> 
> The SMMU that sits in front of the QUP needs to be programmed properly
> so that the i2c geni driver can allocate DMA descriptors. Failure to do
> this leads to faults when using devices such as an i2c touchscreen where
> the transaction is larger than 32 bytes and we use a DMA buffer.
> 
> arm-smmu 15000000.iommu: Unexpected global fault, this could be serious
> arm-smmu 15000000.iommu:         GFSR 0x00000002, GFSYNR0 0x00000002, GFSYNR1 0x000006c0, GFSYNR2 0x00000000
> 
> Add the right SID and mask so this works.

Reviewed-by: Vinod Koul <vkoul@...nel.org>

on DB845c with GSI DMA:
Tested-by: Vinod Koul <vkoul@...nel.org>

-- 
~Vinod