drm/i915: Remove I915_MAX_PIPES dependency for DDB allocation

Remove dependency for I915_MAX_PIPES by replacing it with
for_each_pipe() macro.

v2: use 'enum pipe pipe' instead of 'i'
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1507630626-23806-3-git-send-email-mika.kahola@intel.com

drivers/gpu/drm/i915/intel_display.c

@@ -12215,7 +12215,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
 			if (updated & cmask || !cstate->base.active)
 				continue;
 
-			if (skl_ddb_allocation_overlaps(entries, &cstate->wm.skl.ddb, i))
+			if (skl_ddb_allocation_overlaps(dev_priv,
+							entries,
+							&cstate->wm.skl.ddb,
+							i))
 				continue;
 
 			updated |= cmask;

drivers/gpu/drm/i915/intel_drv.h

@@ -1893,7 +1893,8 @@ int intel_enable_sagv(struct drm_i915_private *dev_priv);
 int intel_disable_sagv(struct drm_i915_private *dev_priv);
 bool skl_wm_level_equals(const struct skl_wm_level *l1,
 			 const struct skl_wm_level *l2);
-bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry **entries,
+bool skl_ddb_allocation_overlaps(struct drm_i915_private *dev_priv,
+				 const struct skl_ddb_entry **entries,
 				 const struct skl_ddb_entry *ddb,
 				 int ignore);
 bool ilk_disable_lp_wm(struct drm_device *dev);

drivers/gpu/drm/i915/intel_pm.c

@@ -4820,16 +4820,18 @@ static inline bool skl_ddb_entries_overlap(const struct skl_ddb_entry *a,
 	return a->start < b->end && b->start < a->end;
 }
 
-bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry **entries,
+bool skl_ddb_allocation_overlaps(struct drm_i915_private *dev_priv,
+				 const struct skl_ddb_entry **entries,
 				 const struct skl_ddb_entry *ddb,
 				 int ignore)
 {
-	int i;
+	enum pipe pipe;
 
-	for (i = 0; i < I915_MAX_PIPES; i++)
-		if (i != ignore && entries[i] &&
-		    skl_ddb_entries_overlap(ddb, entries[i]))
+	for_each_pipe(dev_priv, pipe) {
+		if (pipe != ignore && entries[pipe] &&
+		    skl_ddb_entries_overlap(ddb, entries[pipe]))
 			return true;
+	}
 
 	return false;
 }