From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tejun Heo <htejun@gmail.com>,
greg@kroah.com, linux-ide@vger.kernel.org,
owner-linux-pci@atrey.karlin.mff.cuni.cz
Subject: Re: [PATCH 2/2] ata_piix: fix suspend/resume for some TOSHIBA laptops
Date: Tue, 24 Jul 2007 18:05:55 -0400 [thread overview]
Message-ID: <46A677C3.9090107@garzik.org> (raw)
In-Reply-To: <20070724225747.1dd4d141@the-village.bc.nu>
Alan Cox wrote:
>> A more generalized rule to consider for the future would be to ensure
>> that ALL suspend routines put the hardware back into its pre-Linux init
>> mode before suspending. i.e. that means if we turned on some enhanced
>> mode, we must switch back to legacy mode before calling pci_xxx to
>> suspend our device.
>
> This sounds good but for some hardware you can't get it back into that
> state and there is no guarantee some laptops don't have ACPI suspend
> paths that "know" Windows will have reconfigured the hardware.
Good point. To generalize a bit more: it is quite possible that many
situations will require us to put the hardware device into a certain
mode before suspending, a mode that Linux may not currently be operating
in. ata_piix is definitely not going to be the only one needing this
change, long term.
Jeff
next prev parent reply other threads:[~2007-07-24 22:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-10 6:36 [PATCH 1/2] PCI: export __pci_reenable_device() Tejun Heo
2007-07-10 6:55 ` [PATCH 2/2] ata_piix: fix suspend/resume for some TOSHIBA laptops Tejun Heo
2007-07-24 20:59 ` Jeff Garzik
2007-07-24 21:57 ` Alan Cox
2007-07-24 22:05 ` Jeff Garzik [this message]
2007-07-27 5:43 ` [PATCH] pci: rename __pci_reenable_device() to pci_reenable_device() Tejun Heo
2007-07-27 5:53 ` [PATCH] ata_piix: implement piix_borken_suspend() Tejun Heo
2007-07-27 5:55 ` [PATCH] ata_piix: add Tecra M3 to broken suspend blacklist Tejun Heo
2007-07-27 6:22 ` [PATCH] pci: rename __pci_reenable_device() to pci_reenable_device() Greg KH
2007-08-01 14:02 ` Jeff Garzik
2007-07-10 16:17 ` [PATCH 1/2] PCI: export __pci_reenable_device() Greg KH
2007-07-11 10:32 ` [PATCH 1/2] PCI: rename and " Tejun Heo
2007-07-11 10:32 ` [PATCH 2/2] ata_piix: fix suspend/resume for some TOSHIBA laptops Tejun Heo
2007-07-17 17:05 ` [PATCH 1/2] PCI: rename and export __pci_reenable_device() Greg KH
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