Messages in this thread Patch in this message | | | Date | Wed, 07 Dec 2011 08:11:16 -0800 | From | Greg KH <> | Subject | [014/104] viafb: correct sync polarity for OLPC DCON |
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3.1-stable review patch. If anyone has any objections, please let me know.
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From: Daniel Drake <dsd@laptop.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@laptop.org> Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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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