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[3/6] spi/pl022: disable the PL022 block when unused

Message ID 1320835146-31268-1-git-send-email-linus.walleij@stericsson.com
State Superseded
Headers show

Commit Message

Linus Walleij Nov. 9, 2011, 10:39 a.m. UTC 
From: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>

Make sure we clear the enable bit when the block is not used.
This will save some energy in certain hardware versions.

Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/spi/spi-pl022.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 305f2ba..fa3eaae 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -512,6 +512,11 @@  static void giveback(struct pl022 *pl022)
 	msg->state = NULL;
 	if (msg->complete)
 		msg->complete(msg->context);
+
+	/* disable the SPI/SSP operation */
+	writew((readw(SSP_CR1(pl022->virtbase)) &
+		(~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
+
 	/* This message is completed, so let's turn off the clocks & power */
 	pm_runtime_put(&pl022->adev->dev);
 }