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ARM: 6981/2: mmci: adjust calculation of f_min 

The ARM version maximum clock divider is 512 whereas for the ST
variants it's 257. Let's use DIV_ROUND_UP() for both cases so we
can see clearly what's going on here.

[Use DIV_ROUND_UP to clarify elder code]

Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Reviewed-by: Sebastian Rasmussen <sebastian.rasmussen@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2011-07-08 09:57:15 +01:00 committed by Russell King
parent eb96c92515
commit 7f294e4983
1 changed files with 9 additions and 1 deletions
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10
drivers/mmc/host/mmci.c
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@ -1061,7 +1061,15 @@ static int __devinit mmci_probe(struct amba_device *dev,
}
mmc->ops = &mmci_ops;
mmc->f_min = (host->mclk + 511) / 512;
/*
* The ARM and ST versions of the block have slightly different
* clock divider equations which means that the minimum divider
* differs too.
*/
if (variant->st_clkdiv)
mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
else
mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
/*
* If the platform data supplies a maximum operating
* frequency, this takes precedence. Else, we fall back