linux-kernel - Re: Regression in v5.0-rc1 with autosuspend hrtimers

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Date:   Tue, 8 Jan 2019 08:59:56 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org
Subject: Re: Regression in v5.0-rc1 with autosuspend hrtimers

Hi Tony,

On Tue, 8 Jan 2019 at 00:38, Tony Lindgren <tony@...mide.com> wrote:
>
> Hi all,
>
> Looks like commit 8234f6734c5d ("PM-runtime: Switch autosuspend
> over to using hrtimers") caused a regression on at least
> omap5-uevm where 8250 UART rx wake no longer works. I have not
> noticed this happening on others so far.
>
> The devices I've tested all are using 8250 with dedicated
> wakeirqs configured for the rx pin. I can see the interrupt
> increase on omap5-uevm after some one or more keypresses,
> but then nothing. It seems that the uart just falls back
> asleep right away or something.
>
> Any ideas what might be going wrong?

What is the autosuspend value ? Can it be that the autosuspend is set
to a short value but was finally greater than 10-20ms on arm32. And
now the autosuspend happens before and this has changed the sequence ?

Regards,
Vincent
>
> Regards,
>
> Tony
>