linux-kernel - Re: [PATCH] clk: mediatek: mt8195-infra

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Message-Id: <20220901011612.C4E4DC433C1@smtp.kernel.org>
Date:   Wed, 31 Aug 2022 18:16:10 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, mturquette@...libre.com
Cc:     matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
        wenst@...omium.org, chun-jie.chen@...iatek.com,
        miles.chen@...iatek.com, rex-bc.chen@...iatek.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: mediatek: mt8195-infra_ao: Set pwrmcu clocks as critical

Quoting AngeloGioacchino Del Regno (2022-07-19 02:33:16)
> The pwrmcu is responsible for power management and idle states in SSPM:
> on older SoCs this was managed in Linux drivers like sspm/mcupm/eemgpu
> but, at least on MT8195, this functionality was transferred to the ATF
> firmware.
> For this reason, turning off the pwrmcu related clocks from the kernel
> will lead to unability to resume the platform after suspend and other
> currently unknown PM related side-effects.
> 
> Set the PWRMCU and PWRMCU_BUS_H clocks as critical to prevent the
> kernel from turning them off, fixing the aforementioned issue.
> 
> Fixes: e2edf59dec0b ("clk: mediatek: Add MT8195 infrastructure clock support")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---

Applied to clk-next