linux-kernel - Re: [PATCH 03/17] drm/msm: a6xx: Fix gx_is

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Message-ID: <jeg4dw6wpxpfaio5kd5vcbqswq5nlclor7tbbh7er7zlwgdgxr@ksrw7waxj3mp>
Date: Wed, 23 Jul 2025 14:10:29 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/17] drm/msm: a6xx: Fix gx_is_on check for a7x family

On Wed, Jul 23, 2025 at 01:22:20AM +0530, Akhil P Oommen wrote:
> On 7/22/2025 8:03 PM, Konrad Dybcio wrote:
> > On 7/20/25 2:16 PM, Akhil P Oommen wrote:
> >> Bitfield definition for REG_A6XX_GMU_SPTPRAC_PWR_CLK_STATUS register is
> >> different in A7XX family. Check the correct bits to see if GX is
> >> collapsed on A7XX series.
> >>
> >> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> >> ---
> > 
> > This seems to have been introduced all the way back in the initial
> > a7xx submission downstream, so I'll assume this concerns all SKUs
> > and this is a relevant fixes tag:
> > 
> > Fixes: af66706accdf ("drm/msm/a6xx: Add skeleton A7xx support")
> > 
> > Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
> 
> Dmitry/Konrad,
> 
> We don't have to backport this change because the existing code reads a
> couple of unused bits which are '0's and that is okay when IFPC is not
> supported. So there is no practical benefit in cherry-picking this
> change to older kernel versions.

Fixes tag is not about backporting. It is to point out that there was an
issue in the original commit which is fixed by a new one.

> 
> -Akhil.
> 
> > 
> > Konrad
> 

-- 
With best wishes
Dmitry