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[3/6] sdhci: Always pass clock request value zero to set_clock host op

Message ID 1303520502-32171-4-git-send-email-john.stultz@linaro.org
State Accepted
Commit 30832ab56c80d96cfaf5a786524f0d8c57fadfa1
Headers show

Commit Message

John Stultz April 23, 2011, 1:01 a.m. UTC 
From: Todd Poynor <toddpoynor@google.com>

To allow the set_clock host op to disable the SDCLK source when not
needed, always call the host op when the requested clock speed is
zero.  Do this even if host->clock already equals zero, because
the SDHCI driver may set that value (without calling the host op)
to force an update at the next (non-zero-speed) call.

CC: Chris Ball <cjb@laptop.org>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Dima Zavin <dima@android.com>
Change-Id: If99230d76138679b5767f77cb925f15408ae518e
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/mmc/host/sdhci.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9e15f41..3820adf 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -992,7 +992,7 @@  static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 	u16 clk;
 	unsigned long timeout;
 
-	if (clock == host->clock)
+	if (clock && clock == host->clock)
 		return;
 
 	if (host->ops->set_clock) {