[PATCH] mmci: adjust calculation of f_min
From: Linus Walleij <hidden>
Date: 2011-07-07 20:27:35
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Russell King, Ulf Hansson, Linus Torvalds
From: Ulf Hansson <redacted> 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. Signed-off-by: Ulf Hansson <redacted> Reviewed-by: Sebastian Rasmussen <redacted> [Use DIV_ROUND_UP to clarify elder code] Signed-off-by: Linus Walleij <redacted> --- drivers/mmc/host/mmci.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index fe14072..50f4f77 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c@@ -1063,7 +1063,15 @@ 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
--
1.7.6