linux-kernel - sd_resume redundant? [was: [PATCH] libata: implement ata_wait_after

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Date:	Sun, 20 May 2007 00:33:17 +0200 (CEST)
From:	"Indan Zupancic" <indan@....nu>
To:	"Tejun Heo" <htejun@...il.com>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>, jeff@...zik.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	garyhade@...ibm.com
Subject: sd_resume redundant?  [was: [PATCH] libata: implement 
     ata_wait_after_reset()]

On Sat, May 19, 2007 21:04, Tejun Heo wrote:
> Tejun Heo wrote:
>> Yeah, if SCR registers are accessible, 0xff doesn't indicate the device
>> isn't there, so the whole skip-0xff logic probably shouldn't apply in
>> such cases, but we can also achieve pretty good result by just making
>> the first reset tries a bit more aggressive.
>
> So, here's the patch.
>
> Paul, can you please test this patch without the previous patch?  Indan,
> this should reduce the resume delay.  Please test.  But you'll still
> feel some added delay compared to 2.6.20 due to the mentioned
> suspend/resume change.

This removed the COMRESET errors indeed, and with sd_resume()
disabled everything is speedy again (2s or so. Still a desktop pc).
I didn't try with sd_resume enabled.

Everything seems to work fine without sd_resume(), so why is it needed?

Greetings,

Indan


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