[PATCH 42/84] drm/mgag200: Add missing write to index before accessing data register

[Kamal Mostafa]

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

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

From: Christopher Harvey <charvey at matrox.com>

commit 91f8f105f2b82b4a38dee2d74760bc39d40ec42c upstream.

This is a bug fix for some versions of g200se cards while doing
mode-setting.

Signed-off-by: Christopher Harvey <charvey at matrox.com>
Tested-by: Julia Lemire <jlemire at matrox.com>
Acked-by: Julia Lemire <jlemire at matrox.com>
Signed-off-by: Dave Airlie <airlied at gmail.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 7e2c361..1c087db 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1041,13 +1041,14 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 			else
 				hi_pri_lvl = 5;
 
-			WREG8(0x1fde, 0x06);
-			WREG8(0x1fdf, hi_pri_lvl);
+			WREG8(MGAREG_CRTCEXT_INDEX, 0x06);
+			WREG8(MGAREG_CRTCEXT_DATA, hi_pri_lvl);
 		} else {
+			WREG8(MGAREG_CRTCEXT_INDEX, 0x06);
 			if (mdev->reg_1e24 >= 0x01)
-				WREG8(0x1fdf, 0x03);
+				WREG8(MGAREG_CRTCEXT_DATA, 0x03);
 			else
-				WREG8(0x1fdf, 0x04);
+				WREG8(MGAREG_CRTCEXT_DATA, 0x04);
 		}
 	}
 	return 0;
-- 
1.8.1.2