linux-kernel - [014/104] viafb: correct sync polarity for OLPC DCON

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Date:	Wed, 07 Dec 2011 08:11:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>, Daniel Drake <dsd@...top.org>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [014/104] viafb: correct sync polarity for OLPC DCON

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

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

From: Daniel Drake <dsd@...top.org>

commit a32839696a8eef813a1aff604fbad9a32dff6c95 upstream.

While the OLPC display appears to be able to handle either positive
or negative sync, the Display Controller only recognises positive sync.

This brings viafb (for XO-1.5) in line with lxfb (for XO-1) and
fixes a recent regression where the XO-1.5 DCON could no longer be
frozen. Thanks to Florian Tobias Schandinat for helping identify
the fix.

Test case: from a vt,
	echo 1 > /sys/devices/platform/dcon/freeze
should cause the current screen contents to freeze, rather than garbage being
displayed.

Signed-off-by: Daniel Drake <dsd@...top.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/video/via/share.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/video/via/share.h
+++ b/drivers/video/via/share.h
@@ -557,8 +557,8 @@
 #define M1200X720_R60_VSP       POSITIVE
 
 /* 1200x900@60 Sync Polarity (DCON) */
-#define M1200X900_R60_HSP       NEGATIVE
-#define M1200X900_R60_VSP       NEGATIVE
+#define M1200X900_R60_HSP       POSITIVE
+#define M1200X900_R60_VSP       POSITIVE
 
 /* 1280x600@60 Sync Polarity (GTF Mode) */
 #define M1280x600_R60_HSP       NEGATIVE


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