linux-kernel - Re: [PATCH RFC 1/2] arm64: dts: qcom: msm8953: Add GPU IOMMU

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Date: Fri, 2 Feb 2024 13:19:57 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Luca Weiss <luca@...tu.xyz>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Vladimir Lypak <vladimir.lypak@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] arm64: dts: qcom: msm8953: Add GPU IOMMU

On 27.01.2024 18:24, Luca Weiss wrote:
> On Freitag, 26. Jänner 2024 00:49:55 CET Konrad Dybcio wrote:
>> On 1/25/24 23:24, Dmitry Baryshkov wrote:
>>> On 25/01/2024 23:56, Luca Weiss wrote:
>>>> From: Vladimir Lypak <vladimir.lypak@...il.com>
>>>>
>>>> Add the IOMMU used for the GPU on MSM8953.
>>>>
>>>> Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
>>>> ---
>>>>   arch/arm64/boot/dts/qcom/msm8953.dtsi | 31
>>>> +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/msm8953.dtsi
>>>> b/arch/arm64/boot/dts/qcom/msm8953.dtsi index dcb5c98b793c..91d083871ab0
>>>> 100644
>>>> --- a/arch/arm64/boot/dts/qcom/msm8953.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/msm8953.dtsi
>>>> @@ -1046,6 +1046,37 @@ mdss_dsi1_phy: phy@...6400 {
>>>>               };
>>>>           };
>>>> +        gpu_iommu: iommu@...8000 {
>>>
>>> Nit: most of the platforms use the adreno_smmu label. But maybe the
>>> msm-iommu vs arm-smmu makes difference here.
>> Not really :)
>>
>> Please keep the labels unified
> 
> Ack, renaming to adreno_smmu
> 
>>
>>> Nevertheless:
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>>
>>>> +            compatible = "qcom,msm8953-iommu", "qcom,msm-iommu-v2";
>>>> +            ranges = <0 0x01c48000 0x8000>;
>>>> +
>>>> +            clocks = <&gcc GCC_OXILI_AHB_CLK>,
>>>> +                 <&gcc GCC_BIMC_GFX_CLK>;
>>
>> And align these
> 
> They are?

Not in my email client :P, anyway..

> 
> Also any comment about the issues listed in the cover letter?

I think v2 on all smmus on this platform is right

Konrad