drm/i915: Fix LVDS dither setting

Update bdb_lvds_options structure according to its defination in
2D driver. Then we can parse and set 'lvds_dither' bit correctly
on non-965 chips.

Signed-off-by: Li Peng <peng.li@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/intel_bios.h

@@ -162,13 +162,13 @@ struct bdb_lvds_options {
 	u8 panel_type;
 	u8 rsvd1;
 	/* LVDS capabilities, stored in a dword */
-	u8 rsvd2:1;
-	u8 lvds_edid:1;
-	u8 pixel_dither:1;
-	u8 pfit_ratio_auto:1;
-	u8 pfit_gfx_mode_enhanced:1;
-	u8 pfit_text_mode_enhanced:1;
 	u8 pfit_mode:2;
+	u8 pfit_text_mode_enhanced:1;
+	u8 pfit_gfx_mode_enhanced:1;
+	u8 pfit_ratio_auto:1;
+	u8 pixel_dither:1;
+	u8 lvds_edid:1;
+	u8 rsvd2:1;
 	u8 rsvd4;
 } __attribute__((packed));
 

drivers/gpu/drm/i915/intel_lvds.c

@@ -265,7 +265,7 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
 		pfit_control = 0;
 
 	if (!IS_I965G(dev)) {
-		if (dev_priv->panel_wants_dither)
+		if (dev_priv->panel_wants_dither || dev_priv->lvds_dither)
 			pfit_control |= PANEL_8TO6_DITHER_ENABLE;
 	}
 	else