drm/i915: Introduce intel_dpll_get_hw_state()

Add a wrapper for the pll .get_hw_state() vfunc. Makes life
a bit less miserable when you don't have to worry where the
function pointer is stored.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201109231239.17002-1-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

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

@@ -10857,6 +10857,7 @@ static bool ilk_get_pipe_config(struct intel_crtc *crtc,
 	if (intel_de_read(dev_priv, PCH_TRANSCONF(crtc->pipe)) & TRANS_ENABLE) {
 		struct intel_shared_dpll *pll;
 		enum intel_dpll_id pll_id;
+		bool pll_active;
 
 		pipe_config->has_pch_encoder = true;
 
@@ -10884,8 +10885,9 @@ static bool ilk_get_pipe_config(struct intel_crtc *crtc,
 			intel_get_shared_dpll_by_id(dev_priv, pll_id);
 		pll = pipe_config->shared_dpll;
 
-		drm_WARN_ON(dev, !pll->info->funcs->get_hw_state(dev_priv, pll,
-						 &pipe_config->dpll_hw_state));
+		pll_active = intel_dpll_get_hw_state(dev_priv, pll,
+						     &pipe_config->dpll_hw_state);
+		drm_WARN_ON(dev, !pll_active);
 
 		tmp = pipe_config->dpll_hw_state.dpll;
 		pipe_config->pixel_multiplier =
@@ -11276,9 +11278,9 @@ static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
 
 	pll = pipe_config->shared_dpll;
 	if (pll) {
-		drm_WARN_ON(&dev_priv->drm,
-			    !pll->info->funcs->get_hw_state(dev_priv, pll,
-						&pipe_config->dpll_hw_state));
+		bool pll_active = intel_dpll_get_hw_state(dev_priv, pll,
+							  &pipe_config->dpll_hw_state);
+		drm_WARN_ON(&dev_priv->drm, !pll_active);
 	}
 
 	/*
@@ -14553,7 +14555,7 @@ verify_single_dpll_state(struct drm_i915_private *dev_priv,
 
 	drm_dbg_kms(&dev_priv->drm, "%s\n", pll->info->name);
 
-	active = pll->info->funcs->get_hw_state(dev_priv, pll, &dpll_hw_state);
+	active = intel_dpll_get_hw_state(dev_priv, pll, &dpll_hw_state);
 
 	if (!(pll->info->flags & INTEL_DPLL_ALWAYS_ON)) {
 		I915_STATE_WARN(!pll->on && pll->active_mask,

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

@@ -141,7 +141,7 @@ void assert_shared_dpll(struct drm_i915_private *dev_priv,
 		     "asserting DPLL %s with no DPLL\n", onoff(state)))
 		return;
 
-	cur_state = pll->info->funcs->get_hw_state(dev_priv, pll, &hw_state);
+	cur_state = intel_dpll_get_hw_state(dev_priv, pll, &hw_state);
 	I915_STATE_WARN(cur_state != state,
 	     "%s assertion failure (expected %s, current %s)\n",
 			pll->info->name, onoff(state), onoff(cur_state));
@@ -4527,13 +4527,27 @@ int intel_dpll_get_freq(struct drm_i915_private *i915,
 	return pll->info->funcs->get_freq(i915, pll);
 }
 
+/**
+ * intel_dpll_get_hw_state - readout the DPLL's hardware state
+ * @i915: i915 device
+ * @pll: DPLL for which to calculate the output frequency
+ * @hw_state: DPLL's hardware state
+ *
+ * Read out @pll's hardware state into @hw_state.
+ */
+bool intel_dpll_get_hw_state(struct drm_i915_private *i915,
+			     struct intel_shared_dpll *pll,
+			     struct intel_dpll_hw_state *hw_state)
+{
+	return pll->info->funcs->get_hw_state(i915, pll, hw_state);
+}
+
 static void readout_dpll_hw_state(struct drm_i915_private *i915,
 				  struct intel_shared_dpll *pll)
 {
 	struct intel_crtc *crtc;
 
-	pll->on = pll->info->funcs->get_hw_state(i915, pll,
-						 &pll->state.hw_state);
+	pll->on = intel_dpll_get_hw_state(i915, pll, &pll->state.hw_state);
 
 	if (IS_JSL_EHL(i915) && pll->on &&
 	    pll->info->id == DPLL_ID_EHL_DPLL4) {

drivers/gpu/drm/i915/display/intel_dpll_mgr.h

@@ -400,6 +400,9 @@ void intel_update_active_dpll(struct intel_atomic_state *state,
 			      struct intel_encoder *encoder);
 int intel_dpll_get_freq(struct drm_i915_private *i915,
 			const struct intel_shared_dpll *pll);
+bool intel_dpll_get_hw_state(struct drm_i915_private *i915,
+			     struct intel_shared_dpll *pll,
+			     struct intel_dpll_hw_state *hw_state);
 void intel_prepare_shared_dpll(const struct intel_crtc_state *crtc_state);
 void intel_enable_shared_dpll(const struct intel_crtc_state *crtc_state);
 void intel_disable_shared_dpll(const struct intel_crtc_state *crtc_state);