linux-kernel - Re: [PATCH 1/5] drm/msm/adreno: Use OPP for every GPU generation

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Date:   Mon, 27 Feb 2023 11:45:15 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Chris Healy <cphealy@...il.com>, dmitry.baryshkov@...aro.org
Cc:     airlied@...il.com, Daniel Vetter <daniel@...ll.ch>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        quic_abhinavk@...cinc.com, Rob Clark <robdclark@...il.com>,
        sean@...rly.run, Marek Vasut <marex@...x.de>
Subject: Re: [PATCH 1/5] drm/msm/adreno: Use OPP for every GPU generation



On 24.02.2023 17:56, Chris Healy wrote:
> I may be missing something, but looking at the code path for a2xx,
> it's not clear to me how this would work with SoCs with a2xx that
> don't support 200MHz for GPU frequency.  For example, the NXP i.MX51
> requires the A205 GPU to run at 166MHz while the NXP i.MX53 requires
> the A205 GPU to run at 200MHz.
This is something outside the scope of this patch, I feel like.

If I'm reading the code correctly, the driver always assumed 200 MHz
for non-pwrlevels and non-OPP targets before this patch, and this
patch is meant to bring no difference in the rates selected.

Konrad