diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-09-22 19:45:10 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 10:39:36 -0400 |
| commit | 1e5df7525d0705dfbfded0c10a7b87b0a754a35d (patch) | |
| tree | 0d3812a3381db68b7943239cc5fdc420aedce490 | |
| parent | 4245c0256da0784b1f96d01ff263a71a4ca3894e (diff) | |
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>
| -rw-r--r-- | drivers/mmc/host/sdhci-of.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of.c b/drivers/mmc/host/sdhci-of.c index 1e8aa590bb39..2b0756934f49 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) | |||
| 136 | } | 136 | } |
| 137 | 137 | ||
| 138 | pre_div >>= 1; | 138 | pre_div >>= 1; |
| 139 | div--; | ||
| 139 | 140 | ||
| 140 | setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN | | 141 | setbits32(host->ioaddr + ESDHC_SYSTEM_CONTROL, ESDHC_CLOCK_IPGEN | |
| 141 | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN | | 142 | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN | |