From: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>
Date: Tue, 12 Jun 2012 13:10:58 +0000 (+0200)
Subject: spi/pl022: disable port when unused
X-Git-Tag: v3.4.8~58
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7e7a57b3ea066e3caf149feb37c6487d8423c772;p=platform%2Fkernel%2Flinux-stable.git

spi/pl022: disable port when unused

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>
---

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));
+
 }
 
 /**