drm/i915: Just use icl+ definition for PLANE_WM blocks field

The unused bits on PLANE_WM & co. are hardwired to zero. So no
need to worry about reading the extra bit on pre-icl.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190205205056.30081-2-ville.syrjala@linux.intel.comReviewed-by: José Roberto de Souza <jose.souza@intel.com>

drivers/gpu/drm/i915/i915_reg.h

@@ -6784,8 +6784,7 @@ enum {
 
 #define _PLANE_BUF_CFG_1_B			0x7127c
 #define _PLANE_BUF_CFG_2_B			0x7137c
-#define  SKL_DDB_ENTRY_MASK			0x3FF
-#define  ICL_DDB_ENTRY_MASK			0x7FF
+#define  DDB_ENTRY_MASK				0x7FF /* skl+: 10 bits, icl+ 11 bits */
 #define  DDB_ENTRY_END_SHIFT			16
 #define _PLANE_BUF_CFG_1(pipe)	\
 	_PIPE(pipe, _PLANE_BUF_CFG_1_A, _PLANE_BUF_CFG_1_B)

drivers/gpu/drm/i915/intel_pm.c

@@ -3927,14 +3927,9 @@ static unsigned int skl_cursor_allocation(int num_active)
 static void skl_ddb_entry_init_from_hw(struct drm_i915_private *dev_priv,
 				       struct skl_ddb_entry *entry, u32 reg)
 {
-	u16 mask;
 
-	if (INTEL_GEN(dev_priv) >= 11)
-		mask = ICL_DDB_ENTRY_MASK;
-	else
-		mask = SKL_DDB_ENTRY_MASK;
-	entry->start = reg & mask;
-	entry->end = (reg >> DDB_ENTRY_END_SHIFT) & mask;
+	entry->start = reg & DDB_ENTRY_MASK;
+	entry->end = (reg >> DDB_ENTRY_END_SHIFT) & DDB_ENTRY_MASK;
 
 	if (entry->end)
 		entry->end += 1;