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SubjectRe: sata suspend resume ... (fwd)
On Tue, 25 Apr 2006 08:54:21 +0800 (SGT) Jeff Chua wrote:

>
> On Sun, 23 Apr 2006, Mark Lord wrote:
>
> > Try Randy Dunlop's libata-acpi patches -- I've been using variants of them
> > for a *very long time* here now, as they're the only thing that works for me.
>
> This the one that makes does it!!! I've tried just about all patches
> including the famous "mdelay(2000);" but none worked. ... perhaps it's
> just something to do with IBM X60s which is dual-core.
>
> Here's what I did to make it work...
>
> Linux is vanilla linux-2.6.17-rc2.
>
> Pavel suggested the right step as I was going no where with SMP suspend.
> Switching to UP and using "suspend2" (CONFIG_SUSPEND2) didn't work either
> with PIIX or AHCI. Patch is suspend2-2.2.5-for-2.6.17-rc2.tar.bz2
>
> Then I tried "suspend" (CONFIG_SOFTWARE_SUSPEND) with both PIIX and
> AHIC in UP mode ... still didn't work.
>
> Next, I applied libata-acpi.patch with a little modification. No sure
> what the implication is but the original patch seems to use "i" outside
> the loop. Here's what I added to libata-acpi.patch ... can someone verify
> this or do we need this at all?
>
> +
> + for (i = 0; i < ATA_MAX_DEVICES; i++)
> + ata_acpi_push_id(ap, i);

Yes, that looks appropriate. The function that code lives in
has changed quite a bit since this patch was written.

> Tried both PIIX and AHCI in UP mode. Failed with AHCI, but worked in
> "suspend to disk" in PIIX mode (configured in BIOS under SATA ->
> "COMPATIBILITY").

---
~Randy
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