[PATCH 1/7] sdhci-of: Fix SD clock calculation
From: Anton Vorontsov <hidden>
Date: 2009-08-07 19:58:07
Also in:
lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
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 <redacted> --- 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 9088443..92b5667 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 |
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1.6.3.3