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ARM: 6858/1: mmci: force negative edge on clock bypass for ux500 

This fixes a regression on high clock speeds with the MMCI on
ux500. We need to make sure we derive the passthru clock on the
falling edge of the incoming clock if it shall work at high
frequencies, and on the ux500's there is a special bit for this.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Linus Walleij 2011-04-01 07:59:17 +01:00 committed by Russell King
parent 49ac215e07
commit 399bc4863e
1 changed files with 2 additions and 0 deletions
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2
drivers/mmc/host/mmci.c
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@ -103,6 +103,8 @@ static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
if (desired) {
if (desired >= host->mclk) {
clk = MCI_CLK_BYPASS;
if (variant->st_clkdiv)
clk |= MCI_ST_UX500_NEG_EDGE;
host->cclk = host->mclk;
} else if (variant->st_clkdiv) {
/*