lkml.org 
[lkml]   [2012]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mmc: use usleep_range() in mmc_delay()
Hi,

On Wed, 21 Dec 2011, Dmitry Antipov wrote:
> From f447d78db65c6675e69466e8ed08364ff065ac08 Mon Sep 17 00:00:00 2001
> From: Dmitry Antipov <dmitry.antipov@linaro.org>
> Date: Wed, 21 Dec 2011 10:51:03 +0400
> Subject: [PATCH] mmc: use usleep_range() in mmc_delay()
>
> ---

Shouldn't you add a proper patch description and a signed-off-by line?

> drivers/mmc/core/core.h | 8 ++------
> 1 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
> index 14664f1..a77851e 100644
> --- a/drivers/mmc/core/core.h
> +++ b/drivers/mmc/core/core.h
> @@ -47,12 +47,8 @@ void mmc_power_off(struct mmc_host *host);
>
> static inline void mmc_delay(unsigned int ms)
> {
> - if (ms < 1000 / HZ) {
> - cond_resched();
> - mdelay(ms);
> - } else {
> - msleep(ms);
> - }
> + unsigned long us = ms * USEC_PER_MSEC;
> + usleep_range(us, us + 1000);
> }

Anyway, I think the change is good. On systems with multiple MMC devices
the boot/probe can spend 100-200 ms alone just doing busylooping delays. I
think e.g. in mmc_rescan() the code uses frequently mmc_delay(10).

> void mmc_rescan(struct work_struct *work);
> --
> 1.7.7.4

A.


\
 
 \ /
  Last update: 2012-01-13 14:27    [W:0.079 / U:1.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site