linux-kernel - Re: [PATCH] mmc: use usleep_range() in mmc

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Message-ID: <4EF1D97E.3000201@linaro.org>
Date:	Wed, 21 Dec 2011 17:05:02 +0400
From:	Dmitry Antipov <dmitry.antipov@...aro.org>
To:	Sujit Reddy Thumma <sthumma@...eaurora.org>
CC:	linaro-dev@...ts.linaro.org, patches@...aro.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: use usleep_range() in mmc_delay()

On 12/21/2011 03:25 PM, Sujit Reddy Thumma wrote:

> I have posted similar patch some time back.
> http://comments.gmane.org/gmane.linux.ports.arm.msm/2119.
>
> Would you like to comment on that?

- I believe we should forget about jiffies, HZ and other similar obsolete
   timekeeping stuff;

- I have no ideas where did you get 'most typical' 20 ms. MMC subsystem uses
   mmc_delay() with two compile-time fixed values 1 and 10 ms, with the only
   exception of card-dependent sleep/awake timeout. I was unable to find a table
   with typical values, but it's rounded up to >= 1 ms anyway.

Dmitry
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