linux-kernel - Re: [PATCH 0/2] ACPI / platform: Put devices enumerated via ACPI into D0 before probing drivers

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Date:	Mon, 26 Nov 2012 08:31:18 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	"Svahn, Kai" <kai.svahn@...el.com>,
	Huang Ying <ying.huang@...el.com>,
	"Lan, Tianyu" <tianyu.lan@...el.com>,
	"Zheng, Lv" <lv.zheng@...el.com>, Aaron Lu <aaron.lu@...el.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 0/2] ACPI / platform: Put devices enumerated via ACPI
 into D0 before probing drivers

On Sun, Nov 25, 2012 at 03:54:14PM +0100, Rafael J. Wysocki wrote:
> The following two patches are meant to work around a problem where some
> devices may be in the ACPI D3cold power state (power off) before their
> drivers' .probe() routines are called, but those routines assume devices
> to be operational.  They also allow ACPI PM to be used going forward with
> the devices in question.

We have such machines here. I've tested the series on one of them and it
solves the problem - drivers can now access device registers right from the
start.

> [1/2] - Allow ACPI PM attach/detach routines to change device power states.
> [2/2] - Call the ACPI PM attach/detach routines in the platform probe and
>         remove/shutdown callbacks (and change power states of devices as
>         necessary).

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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