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Message-ID: <20080710113420.GB15412@elf.ucw.cz> Date: Thu, 10 Jul 2008 13:34:20 +0200 From: Pavel Machek <pavel@...e.cz> To: "Rafael J. Wysocki" <rjw@...k.pl> Cc: Andrew Morton <akpm@...ux-foundation.org>, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, pm list <linux-pm@...ts.linux-foundation.org>, Tejun Heo <tj@...nel.org>, Zhang Rui <rui.zhang@...el.com>, Jeff Garzik <jeff@...zik.org> Subject: Re: [PATCH -mm 2/8] AHCI: Speed-up resume On Thu 2008-07-10 01:58:48, Rafael J. Wysocki wrote: > From: Zhang Rui <rui.zhang@...el.com> > Subject: AHCI: Speed-up resume > > 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> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl> ACK. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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