linux-kernel - Re: [PATCH v3 1/9] i2c: tegra: Fix suspending in active runtime PM state

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Message-ID: <e2342be158e84496ba99ec26ad506292@HQMAIL105.nvidia.com>
Date:   Tue, 7 Jan 2020 12:38:53 +0000
From:   Thierry Reding <treding@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>
CC:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        "Mikko Perttunen" <cyndis@...si.fi>,
        Wolfram Sang <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/9] i2c: tegra: Fix suspending in active runtime PM state

On Mon, 06 Jan 2020 04:04:15 +0300, Dmitry Osipenko wrote:
> I noticed that sometime I2C clock is kept enabled during suspend-resume.
> This happens because runtime PM defers dynamic suspension and thus it may
> happen that runtime PM is in active state when system enters into suspend.
> In particular I2C controller that is used for CPU's DVFS is often kept ON
> during suspend because CPU's voltage scaling happens quite often.
> 
> Fixes: 8ebf15e9c869 ("i2c: tegra: Move suspend handling to NOIRQ phase")
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/i2c/busses/i2c-tegra.c | 9 +++++++++
>  1 file changed, 9 insertions(+)

Tested-by: Thierry Reding <treding@...dia.com>