linux-kernel - Re: [PATCH v4 00/19] Enable GPU with DVFS support on MediaTek SoCs

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Date:   Tue, 7 Mar 2023 17:27:00 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 00/19] Enable GPU with DVFS support on MediaTek SoCs

On Thu, Mar 2, 2023 at 7:28 PM Matthias Brugger <matthias.bgg@...il.com> wrote:
> On 02/03/2023 11:11, Chen-Yu Tsai wrote:
> > On Thu, Mar 2, 2023 at 6:10 PM AngeloGioacchino Del Regno
> > <angelogioacchino.delregno@...labora.com> wrote:
> >>
> >> Il 02/03/23 10:36, Matthias Brugger ha scritto:
> >>> Series looks good but from my understanding has a dependency on:
> >>> [PATCH v4 00/12] Panfrost: Improve and add MediaTek SoCs support
> >>> (https://lore.kernel.org/linux-mediatek/20230228102610.707605-1-angelogioacchino.delregno@collabora.com/)
> >>>
> >>> Did I get that right?
> >>>
> >>
> >> Yes you got it right - without the mentioned series, this one will do nothing
> >> at all (and will also fail binding checks, as the bindings are introduced in
> >> that other series).
> >
> > Please also let me test them on MT8183 and MT8186 before merging them.
> >
>
> Of course, I'll wait for your tested-by tags then.
> Thanks for testing!

Tested-by: Chen-Yu Tsai <wenst@...omium.org>

on MT8183, MT8186, MT8192 and MT8195 Chromebooks.

BTW, Angelo, I see that Panfrost keeps the GPU regulator enabled, but
the power domains, and thus the SRAM regulator, get powered off when
the GPU is not in use. There doesn't seem to be any damaging effects,
but I worry about idle power consumption.

ChenYu