[PATCH 3/6] spi/pl022: disable the PL022 block when unused
Linus Walleij
linus.walleij at stericsson.com
Wed Nov 9 05:39:06 EST 2011
From: Virupax Sadashivpetimath <virupax.sadashivpetimath at 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 at stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
drivers/spi/spi-pl022.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
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);
}
--
1.7.3.2
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