drm/i915/dg2: Implement WM0 cursor WA for DG2

Bug in the register unit which results in WM1 register
used when only WM0 is enabled on cursor.
Software workaround is when only WM0 enabled on cursor,
copy contents of CUR_WM_0[30:0] (exclude the enable bit)
into CUR_WM_1[30:0].

v2:  - s/dev_priv/i915/ (Ville Syrjälä)
     - Removed unneeded brackets (Ville Syrjälä)

HSDES: 14012656716

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211118093907.18510-1-stanislav.lisovskiy@intel.com

drivers/gpu/drm/i915/intel_pm.c

@@ -5095,6 +5095,18 @@ skl_check_nv12_wm_level(struct skl_wm_level *wm, struct skl_wm_level *uv_wm,
 	}
 }
 
+static bool icl_need_wm1_wa(struct drm_i915_private *i915,
+			    enum plane_id plane_id)
+{
+	/*
+	 * Wa_1408961008:icl, ehl
+	 * Wa_14012656716:tgl, adl
+	 * Underruns with WM1+ disabled
+	 */
+	return DISPLAY_VER(i915) == 11 ||
+	       (IS_DISPLAY_VER(i915, 12, 13) && plane_id == PLANE_CURSOR);
+}
+
 static int
 skl_allocate_plane_ddb(struct intel_atomic_state *state,
 		       struct intel_crtc *crtc)
@@ -5265,11 +5277,7 @@ skl_allocate_plane_ddb(struct intel_atomic_state *state,
 			skl_check_nv12_wm_level(&wm->wm[level], &wm->uv_wm[level],
 						total[plane_id], uv_total[plane_id]);
 
-			/*
-			 * Wa_1408961008:icl, ehl
-			 * Underruns with WM1+ disabled
-			 */
-			if (DISPLAY_VER(dev_priv) == 11 &&
+			if (icl_need_wm1_wa(dev_priv, plane_id) &&
 			    level == 1 && wm->wm[0].enable) {
 				wm->wm[level].blocks = wm->wm[0].blocks;
 				wm->wm[level].lines = wm->wm[0].lines;