From: Ulf Hansson <ulf.hans...@stericsson.com>
For the st_clkdiv variant f_min is too low for practical cases,
there is a heuristic calculation that appear to set the min
frequency to mclk rounded up with 512, for our practical use
cases dividing by 257 gives a reasonable floor value on the
ST Micro version of the clock divider.
Signed-off-by: Ulf Hansson <ulf.hans...@stericsson.com>
Reviewed-by: Sebastian Rasmussen <sebastian.rasmus...@stericsson.com>
[Use DIV_ROUND_UP to clarify elder code]
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
drivers/mmc/host/mmci.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index fe14072..c73d054 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1063,7 +1063,10 @@ static int __devinit mmci_probe(struct amba_device *dev,
}
mmc->ops = &mmci_ops;
- mmc->f_min = (host->mclk + 511) / 512;
+ if (variant->st_clkdiv)
+ mmc->f_min = 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
--
1.7.3.2
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