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Commit 91f8f105 authored by Christopher Harvey's avatar Christopher Harvey Committed by Dave Airlie
Browse files

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: default avatarChristopher Harvey <charvey@matrox.com>
Tested-by: default avatarJulia Lemire <jlemire@matrox.com>
Acked-by: default avatarJulia Lemire <jlemire@matrox.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDave Airlie <airlied@gmail.com>
parent b06f6a9d

drivers/gpu/drm/mgag200/mgag200_mode.c

+5 −4
Original line number Diff line number Diff line
@@ -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;