* [patch 078/232] sdhci-of: fix SD clock calculation
@ 2009-09-22 23:45 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2009-09-22 23:45 UTC (permalink / raw)
To: torvalds
Cc: akpm, avorontsov, ben, david.vrabel, galak, linux-mmc, pierre,
s.hauer
From: Anton Vorontsov <avorontsov@ru.mvista.com>
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>
---
drivers/mmc/host/sdhci-of.c | 1 +
1 file changed, 1 insertion(+)
diff -puN drivers/mmc/host/sdhci-of.c~sdhci-of-fix-sd-clock-calculation drivers/mmc/host/sdhci-of.c
--- a/drivers/mmc/host/sdhci-of.c~sdhci-of-fix-sd-clock-calculation
+++ a/drivers/mmc/host/sdhci-of.c
@@ -136,6 +136,7 @@ static void esdhc_set_clock(struct sdhci
}
pre_div >>= 1;
+ div--;
setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN |
ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN |
_
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2009-09-22 23:45 [patch 078/232] sdhci-of: fix SD clock calculation akpm
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