linux-kernel - RE: [RFC PATCH 3/3] ACPI / PM: Fix EC polling issue by implementing prepare_late/finish_early suspend

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Date:	Tue, 19 Jul 2016 04:40:03 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Brown, Len" <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: RE: [RFC PATCH 3/3] ACPI / PM: Fix EC polling issue by implementing
 prepare_late/finish_early suspend_ops callbacks

Hi, Rafael

> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
> owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
> Subject: Re: [RFC PATCH 3/3] ACPI / PM: Fix EC polling issue by
> implementing prepare_late/finish_early suspend_ops callbacks
> 
> On Tuesday, June 28, 2016 04:04:46 PM Lv Zheng wrote:
> > _PTS/_WAK may contain EC transactions, it is better to have them
> handled
> > with IRQ enabled. This patch moves the 2 suspend PM ops from noirq
> stage
> > to late/early stage.
> >
> > Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> 
> There are systems that won't work with this patch applied, so I don't
> see a point in applying the other two.
[Lv Zheng] 
I see.
Then instead of moving _WAK/_PTS out of noirq stage, we need to think about tuning the performance of the EC polling mode.

Thanks and best regards
-Lv

> 
> > ---
> >  drivers/acpi/sleep.c |    5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
> > index d30fce7f..c5c374c9 100644
> > --- a/drivers/acpi/sleep.c
> > +++ b/drivers/acpi/sleep.c
> > @@ -595,9 +595,10 @@ static int
> acpi_suspend_state_valid(suspend_state_t pm_state)
> >  static const struct platform_suspend_ops acpi_suspend_ops = {
> >  	.valid = acpi_suspend_state_valid,
> >  	.begin = acpi_suspend_begin,
> > -	.prepare_noirq = acpi_pm_prepare,
> > +	.prepare_late = __acpi_pm_prepare,
> > +	.prepare_noirq = acpi_pm_pre_suspend,
> >  	.enter = acpi_suspend_enter,
> > -	.finish_noirq = acpi_pm_finish,
> > +	.finish_early = acpi_pm_finish,
> >  	.end = acpi_pm_end,
> >  };
> >
> >
> 
> Thanks,
> Rafael
> 
> --
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