linux-kernel - Re: [PATCH v2 11/21] drm/msm/a6xx: Improve MX rail fallback in RPMH vote init

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Message-ID: <76523142-b337-4a31-90d2-c8477ef0b270@oss.qualcomm.com>
Date: Fri, 14 Nov 2025 16:56:45 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Sean Paul <sean@...rly.run>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Jordan Crouse
 <jordan@...micpenguin.net>,
        Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Connor Abbott <cwabbott0@...il.com>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 11/21] drm/msm/a6xx: Improve MX rail fallback in RPMH
 vote init

On 11/12/2025 4:29 PM, Konrad Dybcio wrote:
> On 11/10/25 5:37 PM, Akhil P Oommen wrote:
>> Current logic assumes that the voltage corners in both MxG and MxA are
>> always same. This is not true for recent targets. So, rework the rpmh init
>> sequence to probe and calculate the votes with the respective rails, ie,
>> GX rails should use MxG as secondary rail and Cx rail should use MxA as
>> the secondary rail.
> 
> Is GMU always on Mx*A* and never Mx*C*?

I believe the GMUs we have so far are always on MxA when it is available.

-Akhil.

> 
> Konrad