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

[Christopher Harvey]

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>Julia Lemire <jlemire at 
matrox.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 deed0bd..5b1a9e7 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1034,13 +1034,14 @@ 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;
-- 
1.8.1.5