linux-kernel - Re: [PATCH v6 02/15] dt-bindings: display/msm: gpu: Document GMU wrapper-equipped A6xx

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Date:   Wed, 5 Apr 2023 08:36:25 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>
Subject: Re: [PATCH v6 02/15] dt-bindings: display/msm: gpu: Document GMU
 wrapper-equipped A6xx

On 01/04/2023 13:54, Konrad Dybcio wrote:
> The "GMU Wrapper" is Qualcomm's name for "let's treat the GPU blocks
> we'd normally assign to the GMU as if they were a part of the GMU, even
> though they are not". It's a (good) software representation of the GMU_CX
> and GMU_GX register spaces within the GPUSS that helps us programatically
> treat these de-facto GMU-less parts in a way that's very similar to their
> GMU-equipped cousins, massively saving up on code duplication.
> 
> The "wrapper" register space was specifically designed to mimic the layout
> of a real GMU, though it rather obviously does not have the M3 core et al.
> 
> GMU wrapper-equipped A6xx GPUs require clocks and clock-names to be
> specified under the GPU node, just like their older cousins. Account
> for that.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof