linux-kernel - Re: [PATCH] remoteproc/mtk_scp: Move clk ops outside send

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Message-ID: <CAGXv+5Fh13ciPjrfK2F89QJavePHcBwMwThSALxEF+5CUdA_Yg@mail.gmail.com>
Date:   Thu, 5 Jan 2023 11:00:21 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Subject: Re: [PATCH] remoteproc/mtk_scp: Move clk ops outside send_lock

On Thu, Jan 5, 2023 at 6:22 AM Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:
>
> On Wed, Jan 04, 2023 at 04:31:10PM +0800, Chen-Yu Tsai wrote:
> > Clocks are properly reference counted and do not need to be inside the
> > lock range.
> >
> > Right now this triggers a false-positive lockdep warning on MT8192 based
> > Chromebooks, through a combination of mtk-scp that has a cros-ec-rpmsg
> > sub-device, the (actual) cros-ec I2C adapter registration, I2C client
> > (not on cros-ec) probe doing i2c transfers and enabling clocks.
> >
> > This is a false positive because the cros-ec-rpmsg under mtk-scp does
> > not have an I2C adapter, and also each I2C adapter and cros-ec instance
> > have their own mutex.
> >
> > Move the clk operations outside of the send_lock range.
>
> Thanks for providing such a clear explanation - it makes my job a lot easier.
>
> >
> > Fixes: ("63c13d61eafe remoteproc/mediatek: add SCP support for mt8183")
>
> This is the wrong format for a "Fixes:" tag.  Please see
> Documentation/process/submitting-patches.rst for details.
>
> > Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
>
> I have fixed the above and applied this patch.

Thanks, and sorry about the brain fart on my end.

ChenYu