From: Tejun Heo <tj@kernel.org>
To: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm <linux-pm@lists.linux-foundation.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: [RFC PATCH] AHCI: speed up resume
Date: Fri, 04 Jul 2008 17:10:32 +0900 [thread overview]
Message-ID: <486DDAF8.6050605@kernel.org> (raw)
In-Reply-To: <1215149537.3068.18.camel@rzhang-dt.sh.intel.com>
Zhang Rui wrote:
> From: Zhang Rui <rui.zhang@intel.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@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
--
tejun
next prev parent reply other threads:[~2008-07-04 8:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-03 8:48 [RFC PATCH] AHCI: speed up resume Zhang Rui
2008-07-03 23:23 ` Rafael J. Wysocki
2008-07-04 1:48 ` Zhang Rui
2008-07-04 2:48 ` Tejun Heo
2008-07-04 5:32 ` Zhang Rui
2008-07-04 8:10 ` Tejun Heo [this message]
2008-07-11 13:49 ` Jeff Garzik
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