From: Anton Vorontsov <avoront...@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 <avoront...@ru.mvista.com>
Cc: Pierre Ossman <pie...@ossman.eu>
Cc: Kumar Gala <ga...@kernel.crashing.org>
Cc: David Vrabel <david.vra...@csr.com>
Cc: Ben Dooks <b...@fluff.org>
Cc: Sascha Hauer <s.ha...@pengutronix.de>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@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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