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Message-ID: <58cb370e0512070645o78569e82y63483a9ae5511f52@mail.gmail.com>
Date: Wed, 7 Dec 2005 15:45:19 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Subject: Re: [RFC]add ACPI hooks for IDE suspend/resume
Cc: Shaohua Li <shaohua.li@intel.com>, linux-ide <linux-ide@vger.kernel.org>,
       lkml <linux-kernel@vger.kernel.org>, pavel <pavel@ucw.cz>,
       Len Brown <len.brown@intel.com>, akpm <akpm@osdl.org>
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On 12/7/05, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Wed, Dec 07, 2005 at 03:19:07PM +0100, Bartlomiej Zolnierkiewicz wrote:
> > On 12/7/05, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> > > On Wed, Dec 07, 2005 at 09:17:31AM +0100, Bartlomiej Zolnierkiewicz wrote:
> > >
> > > > Isn't ide-io.c:ide_{start,complete}_power_step() enough?
> > >
> > > No.
> >
> > Why? :)
>
> Heh :) The failure is (IIRC, I don't have the serial logs to hand)
> before ide_start_power_step() is called. We get to start_request(), and
> the system then fails with "bus not ready on wakeup" and "drive not
> ready on wakeup". Calling the _GTM and _STM ACPI methods before then
> lets the system come back up normally.

OK, I understand it now - when using 'ide-generic' host driver for IDE
PCI device, resume fails (for obvious reason - IDE PCI device is not
re-configured) and this patch fixes it through using ACPI methods.

Thanks,
Bartlomiej
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