From: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx> 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.hansson@xxxxxxxxxxxxxx> Reviewed-by: Sebastian Rasmussen <sebastian.rasmussen@xxxxxxxxxxxxxx> [Use DIV_ROUND_UP to clarify elder code] Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
