linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845: Limit ipa iommu streams

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Date:   Tue, 24 Nov 2020 13:49:03 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Alex Elder <elder@...e.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Alex Elder <elder@...aro.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm845: Limit ipa iommu streams

On Tue 24 Nov 13:18 CST 2020, Alex Elder wrote:

> On 11/22/20 11:23 PM, Bjorn Andersson wrote:
> > The Android and Windows firmware does not accept the use of 3 as a mask
> > to cover the IPA streams. But with 0x721 being related to WiFi and 0x723
> > being unsed the mapping can be reduced to just cover 0x720 and 0x722,
> > which is accepted.
> 
> Do you want to update sc7180.dtsi too?
> 

We probably want that too, but currently we don't have any sc7180
devices that shows this problem...

> I tried your change on my SDM845 machine and observed no
> problem.   I tried the comparable change in "sc7180.dtsi"
> (using 440 and 442) and that seemed to work as before also.
> 
> If you think that's sufficient, you can add:
> 
> Tested-by: Alex Elder <elder@...aro.org>
> 
> Otherwise:
> 
> Acked-by: Alex Elder <elder@...aro.org>
> 

Thank you,
Bjorn

> 
> > Fixes: e9e89c45bfeb ("arm64: dts: sdm845: add IPA iommus property")
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >   arch/arm64/boot/dts/qcom/sdm845.dtsi | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > index 0da27b065761..a6147bd54cdf 100644
> > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> > @@ -2136,7 +2136,8 @@ ufs_mem_phy_lanes: lanes@...7400 {
> >   		ipa: ipa@...0000 {
> >   			compatible = "qcom,sdm845-ipa";
> > -			iommus = <&apps_smmu 0x720 0x3>;
> > +			iommus = <&apps_smmu 0x720 0x0>,
> > +				 <&apps_smmu 0x722 0x0>;
> >   			reg = <0 0x1e40000 0 0x7000>,
> >   			      <0 0x1e47000 0 0x2000>,
> >   			      <0 0x1e04000 0 0x2c000>;
> > 
>