提交 7f294e49 编写于 作者: L Linus Walleij 提交者: Russell King

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: NUlf Hansson <ulf.hansson@stericsson.com>
Reviewed-by: NSebastian Rasmussen <sebastian.rasmussen@stericsson.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
上级 eb96c925
......@@ -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
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册