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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-09-22 16:45:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:36 -0700
commit1e5df7525d0705dfbfded0c10a7b87b0a754a35d (patch)
tree0d3812a3381db68b7943239cc5fdc420aedce490 /drivers/mmc
parent4245c0256da0784b1f96d01ff263a71a4ca3894e (diff)
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sdhci-of: fix SD clock calculation
Linear divisor's values in a register start at 0 (zero means "divide by 1"). Before this patch the code didn't account that fact, so SD cards were running underclocked. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: Pierre Ossman <pierre@ossman.eu> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: David Vrabel <david.vrabel@csr.com> Cc: Ben Dooks <ben@fluff.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-of.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of.c b/drivers/mmc/host/sdhci-of.c
index 1e8aa590..2b07569 100644
--- a/drivers/mmc/host/sdhci-of.c
+++ b/drivers/mmc/host/sdhci-of.c
@@ -136,6 +136,7 @@ static void esdhc_set_clock(struct sdhci_host *host, unsigned int clock)
}
pre_div >>= 1;
+ div--;
setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN |
ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN |