linux-kernel - Re: [PATCH 2/2] drivers: libata-core: Use usleep_range() instead of msleep() for short sleeps (<20 ms)

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Date:	Fri, 8 Jan 2016 10:36:18 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Daniel Walker <danielwa@...co.com>
Cc:	Anil Veliyankara Madam <aveliyan@...co.com>,
	xe-kernel@...ernal.cisco.com, Shikha Jain <shikjain@...co.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drivers: libata-core: Use usleep_range() instead of
 msleep() for short sleeps (<20 ms)

On Thu, Jan 07, 2016 at 09:18:52PM -0800, Daniel Walker wrote:
> From: Anil Veliyankara Madam <aveliyan@...co.com>
> 
> Since msleep() may sleep longer than intended time for values less
> than 20ms, this patch allows the use of usleep_range for waits less
> that 20ms. usleep_range is a finer precision implementation of
> msleep and is designed to be a drop-in replacement for udelay
> where a precise sleep/busy-wait is unnecessary.
> 
> More details can be found at http://lkml.org/lkml/2007/8/3/250
> and in Documentation/timers/timers-howto.txt.
> 
> This change has been done to improve the performace in PIO6 mode
> which is used by viking flash.
> 
> Cc: xe-kernel@...ernal.cisco.com
> Signed-off-by: Anil Veliyankara Madam <aveliyan@...co.com>
> Signed-off-by: Shikha Jain <shikjain@...co.com>

Applied to libata/for-4.5.

Thanks.

-- 
tejun