linux-kernel - Re: [RFC/RFT][PATCH 4/5] ACPI / LPSS: Support for device latency tolerance PM QoS

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Message-ID: <1623216.7y3zYLQxqp@vostro.rjw.lan>
Date:	Mon, 20 Jan 2014 14:10:10 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT][PATCH 4/5] ACPI / LPSS: Support for device latency tolerance PM QoS

On Monday, January 20, 2014 01:15:19 PM Mika Westerberg wrote:
> On Fri, Jan 17, 2014 at 03:46:40PM +0100, Rafael J. Wysocki wrote:
> > @@ -415,11 +472,12 @@ static int acpi_lpss_platform_notify(str
> >  		return 0;
> >  	}
> >  
> > -	if (action == BUS_NOTIFY_ADD_DEVICE)
> > +	if (action == BUS_NOTIFY_ADD_DEVICE) {
> >  		ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group);
> > -	else if (action == BUS_NOTIFY_DEL_DEVICE)
> > +		pdev->dev.power.set_latency_tolerance = acpi_lpss_set_ltr;
> 
> While trying to test this I noticed that BUS_NOTIFY_ADD_DEVICE happens
> after call to dpm_sysfs_add(), so LTR field is never exposed to the
> userspace.

Ahh, I confused things, thanks for reporting this!

I'll need to hook it up to acpi_platform_notify() somehow I think.

> > +	} else if (action == BUS_NOTIFY_DEL_DEVICE) {
> >  		sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
> > -
> > +	}
> >  	return ret;
> >  }
> >  

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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