Date: Fri, 3 Feb 2006 08:34:58 -0800 (PST)
From: "Randy.Dunlap" <rdunlap@xenotime.net>
To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
cc: Matthew Garrett <mgarrett@chiark.greenend.org.uk>,
       Andrew Morton <akpm@osdl.org>, Lee Revell <rlrevell@joe-job.com>,
       nigel@suspend2.net, torvalds@osdl.org, linux-kernel@vger.kernel.org,
       Pavel Machek <pavel@ucw.cz>, Shaohua Li <shaohua.li@intel.com>
Subject: Re: [ 00/10] [Suspend2] Modules support.
In-Reply-To: <58cb370e0602030632p2168fbeaga2a1089b1eea8dfc@mail.gmail.com>
Message-ID: <Pine.LNX.4.58.0602030832240.32067@shark.he.net>
References: <20060201113710.6320.68289.stgit@localhost.localdomain> 
 <20060202152316.GC8944@ucw.cz> <20060202132708.62881af6.akpm@osdl.org> 
 <1138916079.15691.130.camel@mindpipe>  <20060202142323.088a585c.akpm@osdl.org>
  <20060203105100.GD2830@elf.ucw.cz>  <58cb370e0602030322u4c2c9f9bm21a38be6d35d2ea6@mail.gmail.com>
  <20060203113543.GA3056@elf.ucw.cz>  <58cb370e0602030546q2ea4b70bq1dc66306d5ef1b12@mail.gmail.com>
  <E1F51dd-0005cc-00@chiark.greenend.org.uk>
 <58cb370e0602030632p2168fbeaga2a1089b1eea8dfc@mail.gmail.com>
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On Fri, 3 Feb 2006, Bartlomiej Zolnierkiewicz wrote:

> On 2/3/06, Matthew Garrett <mgarrett@chiark.greenend.org.uk> wrote:
> > Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> wrote:
> >
> > > This is untrue as Linux has support for setting IDE controller
> > > and drives.  It was added by Benjamin Herrenschmidt in late
> > > 2.5.x or early 2.6.x (I don't remember exact kernel version).
> >
> > In generic_ide_resume, rqpm.pm_step gets set to
> > ide_pm_state_start_resume and ide_do_drive_cmd gets called. This ends up
> > being passed through to start_request. start_request waits for the BSY
> > bit to go away. On the affected hardware I've seen, this never happens
> > unless the ACPI calls are made. As far as I can tell, there's nothing in
> > the current driver code that does anything to make sure that the bus is
> > in a state to accept commands at this point - the pci drivers don't (for
> > the most part) seem to have any resume methods. Calling the ACPI _STM
> > method before attempting to do this magically makes everything work.
>
> I don't see anything that prevents addition of ->suspend and ->resume
> for IDE PCI host drivers (not IDE core issue) if some special sequence
> is needed.
>
> I see that we may be doing PIO/DMA setup too late (IDE core issue)
> for some controllers.
>
> Could you fill a bug at kernel bugzilla with data as much data about
> affected hardware as possible (dmesg, kernel config, lspci -vvv -xxx
> before susped and if possible PCI configuration dumped from kernel
> after suspend)?
>
> What is the current state of IDE ACPI patches?
> Were the issues raised on linux-ide addressed?

I haven't seen any updates to the drivers/ide/ patch from
Shaohua Li <shaohua.li@intel.com>.  I'm beginning to work on
PATA ACPI object support that is similar to the current SATA ACPI
patches -- all for libata.  Is this the right or wrong thing
to do?

Thanks,
-- 
~Randy
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