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[1/3] spi/pl022: disable port when unused

Message ID 1339510796-13333-1-git-send-email-linus.walleij@stericsson.com
State New
Headers show

Commit Message

Linus Walleij June 12, 2012, 2:19 p.m. UTC 
From: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>

Commit ffbbdd21329f3e15eeca6df2d4bc11c04d9d91c0
"spi: create a message queueing infrastructure"
Accidentally deleted the logic to disable the port
when unused leading to higher power consumption.
Fix this up.

Cc: stable@kernel.org
Cc: Vinit Shenoy <vinit.shenoy@st.com>
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 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 400ae21..469eb28 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -489,6 +489,11 @@  static void giveback(struct pl022 *pl022)
 	pl022->cur_transfer = NULL;
 	pl022->cur_chip = NULL;
 	spi_finalize_current_message(pl022->master);
+
+	/* disable the SPI/SSP operation */
+	writew((readw(SSP_CR1(pl022->virtbase)) &
+		(~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
+
 }
 
 /**