From: Nathan Bryant <nbryant@optonline.net>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-scsi@vger.kernel.org, Pavel Machek <pavel@ucw.cz>
Subject: Re: device_suspend() levels [was Re: [patch] ACPI work on aic7xxx]
Date: Mon, 26 Jul 2004 10:02:18 -0400 [thread overview]
Message-ID: <41050EEA.5040107@optonline.net> (raw)
In-Reply-To: <1090793440.1987.2.camel@gaston>
Benjamin Herrenschmidt wrote:
> On Sat, 2004-07-24 at 20:19, Nathan Bryant wrote:
>
>>Benjamin Herrenschmidt wrote:
>>
>>
>>>That's different, because the disks are actually registered as
>>>"struct device" childs of the bus, and thus get proper suspend/resume
>>>callbacks.
>>
>>Ok, Seems like we rely on the BIOS a lot, here.
>
>
> How so ? not at all !
For suspend/resume and also initialization on bootup. We're not saving
the chip state for PIIX so I assume we're hoping that ACPI does it for us
> We need to issue the stuff from the low level driver (like aix7xxx) or
> the disk, that is sd, but we should make sure sg etc... also properly
> call the stuff, actually, look at IDE, I defined the special power
> request to act as a state machine once down the queue so the ide layer
> acts differently for disks, cdroms, etc... by sending appropriate
> commands like standby for disks.
There's another one - synchronize cache or disable write back cache on
the drive....
next prev parent reply other threads:[~2004-07-26 14:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-20 15:22 [patch] ACPI work on aic7xxx Nathan Bryant
2004-07-20 15:59 ` Pavel Machek
2004-07-20 16:48 ` Nathan Bryant
2004-07-20 17:46 ` device_suspend() levels [was Re: [patch] ACPI work on aic7xxx] Pavel Machek
2004-07-20 18:10 ` Nathan Bryant
2004-07-20 18:25 ` Benjamin Herrenschmidt
2004-07-20 18:34 ` Nathan Bryant
2004-07-20 19:10 ` Benjamin Herrenschmidt
2004-07-20 19:23 ` Pavel Machek
[not found] ` <40FD82B1.8030704@optonline.net>
2004-07-20 20:41 ` Benjamin Herrenschmidt
2004-07-20 20:50 ` Nathan Bryant
2004-07-20 21:02 ` Benjamin Herrenschmidt
2004-07-24 15:31 ` Nathan Bryant
2004-07-24 16:00 ` Benjamin Herrenschmidt
2004-07-24 16:45 ` Nathan Bryant
2004-07-24 18:35 ` Benjamin Herrenschmidt
2004-07-25 0:19 ` Nathan Bryant
2004-07-25 22:10 ` Benjamin Herrenschmidt
2004-07-26 7:32 ` Andre Hedrick
2004-07-28 1:18 ` Benjamin Herrenschmidt
2004-07-26 14:02 ` Nathan Bryant [this message]
2004-07-28 1:16 ` Benjamin Herrenschmidt
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