drm/i915: Extract cdclk requirements checking to separate function

In Gen11+ whenever we might exceed DBuf bandwidth we might need to
recalculate CDCLK which DBuf bandwidth is scaled with.
Total Dbuf bw used might change based on particular plane needs.

Thus to calculate if cdclk needs to be changed it is not enough
anymore to check plane configuration and plane min cdclk, per DBuf
bw can be calculated only after wm/ddb calculation is done and
all required planes are added into the state. In order to keep
all min_cdclk related checks in one place let's extract it into
separate function, checking and modifying any_ms.

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200519131117.17190-3-stanislav.lisovskiy@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -14646,8 +14646,7 @@ static bool active_planes_affects_min_cdclk(struct drm_i915_private *dev_priv)
 		IS_IVYBRIDGE(dev_priv);
 }
 
-static int intel_atomic_check_planes(struct intel_atomic_state *state,
-				     bool *need_cdclk_calc)
+static int intel_atomic_check_planes(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
 	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
@@ -14697,6 +14696,22 @@ static int intel_atomic_check_planes(struct intel_atomic_state *state,
 			return ret;
 	}
 
+	return 0;
+}
+
+static int intel_atomic_check_cdclk(struct intel_atomic_state *state,
+				    bool *need_cdclk_calc)
+{
+	struct intel_cdclk_state *new_cdclk_state;
+	int i;
+	struct intel_plane_state *plane_state;
+	struct intel_plane *plane;
+	int ret;
+
+	new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
+	if (new_cdclk_state && new_cdclk_state->force_min_cdclk_changed)
+		*need_cdclk_calc = true;
+
 	/*
 	 * active_planes bitmask has been updated, and potentially
 	 * affected planes are part of the state. We can now
@@ -14759,7 +14774,6 @@ static int intel_atomic_check(struct drm_device *dev,
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *state = to_intel_atomic_state(_state);
 	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
-	struct intel_cdclk_state *new_cdclk_state;
 	struct intel_crtc *crtc;
 	int ret, i;
 	bool any_ms = false;
@@ -14870,14 +14884,10 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
-	ret = intel_atomic_check_planes(state, &any_ms);
+	ret = intel_atomic_check_planes(state);
 	if (ret)
 		goto fail;
 
-	new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
-	if (new_cdclk_state && new_cdclk_state->force_min_cdclk_changed)
-		any_ms = true;
-
 	/*
 	 * distrust_bios_wm will force a full dbuf recomputation
 	 * but the hardware state will only get updated accordingly
@@ -14907,6 +14917,10 @@ static int intel_atomic_check(struct drm_device *dev,
 	if (ret)
 		goto fail;
 
+	ret = intel_atomic_check_cdclk(state, &any_ms);
+	if (ret)
+		goto fail;
+
 	if (any_ms) {
 		ret = intel_modeset_calc_cdclk(state);
 		if (ret)