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

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

Signed-off-by: Christopher Harvey <charvey@matrox.com>
Tested-by: Julia Lemire <jlemire@matrox.com>
Acked-by: Julia Lemire <jlemire@matrox.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@gmail.com>

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 77b8a45fb10a3c872aa86304f22abf16266a0249..ee66badc8bb63b4b49e61744a40ad213e6330954 100644 (file)
--- 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;