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SubjectRe: State of resume for AHCI?
The one-line "resume fix" (attached) *might* be all that you need.
This is in current Linus 2.6.17-rc*-git*

Cheers
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From: Mark Lord <liml@rtr.ca>
Organization: Real-Time Remedies Inc.
To: Jeff Garzik <jeff@garzik.org>
Subject: [PATCH] 2.6.17-rc5: the latest consensus libata resume fix
Date: Sun, 28 May 2006 11:28:00 -0400
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Cc: Linus Torvalds <torvalds@osdl.org>, Jens Axboe <axboe@suse.de>,
"zhao, forrest" <forrest.zhao@intel.com>,
Tejun Heo <htejun@gmail.com>, linux-ide@vger.kernel.org
References: <200605272245.30108.axboe@suse.de> <Pine.LNX.4.64.0605271716030.5623@g5.osdl.org> <4478F681.8050607@garzik.org>
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Okay, just to sum things up.

The patch below is the current "release candidate" for
improving the libata/ata_piix resume functionality in 2.6.17-rc*.

It forces libata to wait for up to 2 seconds for BUSY|DRQ to clear
on resume before continuing. This is only for 2.6.17 at present.
We are waiting on Jens to test and report back for this specific version.

Signed-off-by: Mark Lord <liml@rtr.ca>
---
--- linux-2.6.17-rc5/drivers/scsi/libata-core.c
+++ linux/drivers/scsi/libata-core.c
@@ -4296,6 +4296,7 @@ static int ata_start_drive(struct ata_po
*/
int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
{
if (ap->flags & ATA_FLAG_SUSPENDED) {
+ ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 200000);
ap->flags &= ~ATA_FLAG_SUSPENDED;
ata_set_mode(ap);
-
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