[PATCH v2 1/4] drm/mgag200: Don't change unrelated registers during modeset

[Christopher Harvey <charvey@matrox.com>]

Registers in indices below 0x18 are totally unrelated to modesetting,
so don't write 0's, or anything else into them on modeset. Most of
these registers are hardware cursor related, so this existing code
interferes with hardware cursor development.

Signed-off-by: Christopher Harvey <charvey@matrox.com>
Tested-by: Julia Lemire <jlemire@matrox.com>
Acked-by: Julia Lemire <jlemire@matrox.com>
Acked-by: Mathieu Larouche <mathieu.larouche@matrox.com>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index f988965..2d9333d 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -829,11 +829,7 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 
 
 	for (i = 0; i < sizeof(dacvalue); i++) {
-		if ((i <= 0x03) ||
-		    (i == 0x07) ||
-		    (i == 0x0b) ||
-		    (i == 0x0f) ||
-		    ((i >= 0x13) && (i <= 0x17)) ||
+		if ((i <= 0x17) ||
 		    (i == 0x1b) ||
 		    (i == 0x1c) ||
 		    ((i >= 0x1f) && (i <= 0x29)) ||
-- 
1.8.1.5