linux-kernel - Re: [PATCH v2 08/16] arm64: dts: mediatek: mt8192: Add mfg_ref

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Message-ID: <CAGXv+5GECpvXB3qoPr0TwrJP-tOaPULd8uiMOcTKWX5f4zvWWw@mail.gmail.com>
Date:   Fri, 24 Feb 2023 17:57:07 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     matthias.bgg@...il.com, 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 v2 08/16] arm64: dts: mediatek: mt8192: Add mfg_ref_sel
 clock to MFG0 domain

On Thu, Feb 23, 2023 at 9:44 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> The mfg_ref_sel clock is a mux used to switch between different "safe"
> (and slower) clock sources for the GPU: this is used during MFGPLL
> reconfiguration and eventually during idling at very low frequencies.
>
> This clock getting turned off means that the GPU will occasionally be
> unclocked, producing obvious consequences such as system crash or
> unpredictable behavior: assigning it to the top level MFG power domain
> will make sure that this stays on at all times during any operation on
> the MFG domain (only GPU-related transactions).
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

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