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Date:   Tue, 4 Jun 2019 15:37:00 -0700
From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Stephen Boyd <swboyd@chromium.org>
Cc:     Andy Gross <agross@kernel.org>, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, Sibi Sankar <sibis@codeaurora.org>
Subject: Re: [PATCH] arm64: dts: sdm845: Add iommus property to qup1
Message-ID: <20190604223700.GE4814@minitux>
References: <20190604222939.195471-1-swboyd@chromium.org>
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On Tue 04 Jun 15:29 PDT 2019, Stephen Boyd wrote:

> 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.
> 

I'm pretty sure I've run into this problem, but before we marked the
smmu bypass_disable and as such didn't get the fault, thanks.

>  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.
> 
> Cc: Sibi Sankar <sibis@codeaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index fcb93300ca62..2e57e861e17c 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -900,6 +900,7 @@
>  			#address-cells = <2>;
>  			#size-cells = <2>;
>  			ranges;
> +			iommus = <&apps_smmu 0x6c0 0x3>;

According to the docs this stream belongs to TZ, the HLOS stream should
be 0x6c3.

Regards,
Bjorn

>  			status = "disabled";
>  
>  			i2c8: i2c@a80000 {
> -- 
> Sent by a computer through tubes
>