4.9-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 3.5.1 / spi-pl022-disable-port-when-unused.patch

From fd316941cfee1fbd12746afea83720fb7823888a Mon Sep 17 00:00:00 2001
From: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Date: Tue, 12 Jun 2012 15:10:58 +0200
Subject: spi/pl022: disable port when unused

From: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>

commit fd316941cfee1fbd12746afea83720fb7823888a upstream.

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: Vinit Shenoy <vinit.shenoy@st.com>
Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/spi/spi-pl022.c |    5 +++++
 1 file changed, 5 insertions(+)

--- 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));
+
 }
 
 /**