linux-kernel - Re: [RFC PATCH] AHCI: speed up resume

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Message-ID: <486DDAF8.6050605@kernel.org>
Date:	Fri, 04 Jul 2008 17:10:32 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Zhang Rui <rui.zhang@...el.com>
CC:	linux-pm <linux-pm@...ts.linux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [RFC PATCH] AHCI: speed up resume

Zhang Rui wrote:
> From: Zhang Rui <rui.zhang@...el.com>
> 
> During resume, sleep 1 second to wait for the HBA reset
> to finish is a waste of time.
> 
> According to the AHCI 1.2 spec,
> We should poll the HOST_CTL register,
> and return error if the host reset is not
> finished within 1 second.
> 
> Test results show that the HBA reset can be done quickly(in usecs).
> And this patch may save nearly 1 second during resume.
> 
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>

Acked-by: Tejun Heo <tj@...nel.org>

-- 
tejun
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