[PATCH 1/2] mmc: sdhci: replace msleep with mdelay for tuning

[Shawn Guo]

Copy Jeremie for comment.

On Wed, Oct 30, 2013 at 10:10:41PM +0800, Dong Aisheng wrote:
> The former patch 404aceb may break the tuning process of SD3.0/eMMC4.5 cards.
> It changed the mdelay in tuning process to msleep,
> However, because the more delay of msleep(1) than mdelay(1), it will
> easily lead to a 150ms timeout as limited by the spec.
> 
> We oberved tuning failed due to timeout on a Toshiba UHS and eMMC4.5 card
> after this change. Thus, for the time sensitive tuning process, change it
> back to mdelay as before.
> 
> The breaking patch is:
> 404aceb mmc: sdhci: Get rid of mdelay()s where it is safe and makes sense

The ID of the commit in linux-next is 946498b

Shawn

> 
> Signed-off-by: Dong Aisheng <b29396 at freescale.com>
> ---
>  drivers/mmc/host/sdhci.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 22eab3a..2ef5314 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1981,7 +1981,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>  
>  		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>  		tuning_loop_counter--;
> -		msleep(1);
> +		mdelay(1);
>  	} while (ctrl & SDHCI_CTRL_EXEC_TUNING);
>  
>  	/*
> -- 
> 1.7.2.rc3
> 
>