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Date:   Mon, 13 Nov 2023 11:59:49 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Alexander Sverdlin <alexander.sverdlin@...il.com>
Cc:     Andy Shevchenko <andy@...nel.org>, nikita.shubin@...uefel.me,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Lennert Buytenhek <kernel@...tstofly.org>,
        Russell King <linux@...linux.org.uk>,
        Lukasz Majewski <lukma@...x.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Sebastian Reichel <sre@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Mark Brown <broonie@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Vinod Koul <vkoul@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Damien Le Moal <dlemoal@...nel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Michael Peters <mpeters@...eddedts.com>,
        Kris Bahnsen <kris@...eddedts.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
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        linux-watchdog@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-spi@...r.kernel.org,
        netdev@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-ide@...r.kernel.org,
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Subject: Re: [PATCH v3 14/42] power: reset: Add a driver for the ep93xx reset

On Sat, Nov 11, 2023 at 8:18 PM Alexander Sverdlin
<alexander.sverdlin@...il.com> wrote:
> On Fri, 2023-07-21 at 19:37 +0300, Andy Shevchenko wrote:

...

> > > +       mdelay(1000);
> >
> > Atomic?! Such a huge delay must be explained, esp. why it's atomic.
>
> atomic or not, SoC is supposed to reset itself here.
> However there is an errata [1] and the SoC can lockup instead.

Good, and what I'm saying is that this piece of code must have a
comment explaining this.

> So even pr_emerg() makes sense to me.

This is irrelevant to the comment.

> > > +       pr_emerg("Unable to restart system\n");
> > > +       return NOTIFY_DONE;
>
> [1] http://web.archive.org/web/20161130230727/http://www.cirrus.com/en/pubs/appNote/AN258REV2.pdf

-- 
With Best Regards,
Andy Shevchenko

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