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authorLinus Walleij <linus.walleij@linaro.org>2011-07-08 09:57:15 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-19 16:04:35 +0100
commit7f294e4983b67be802277d139522837b3ce5769f (patch)
tree9132eb2d87e70db9c8cee1d8132d6f69d1b6cdec /drivers/mmc/host
parenteb96c925152fc289311e5d7e956b919e9b60ab53 (diff)
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>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/mmci.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 7721de942c69..c471cdb1a0ba 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -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