linux-kernel - [ 072/122] spi/pl022: disable port when unused

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Message-Id: <20120807221955.096915185@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:26:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Vinit Shenoy <vinit.shenoy@...com>,
	Virupax Sadashivpetimath 
	<virupax.sadashivpetimath@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [ 072/122] spi/pl022: disable port when unused

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Virupax Sadashivpetimath <virupax.sadashivpetimath@...ricsson.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@...com>
Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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));
+
 }
 
 /**


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