drm/i915/display: Add a intel_pipe_is_enabled() helper

Factor the code to check if a pipe is currently enabled out of
assert_pipe() and put it in a new intel_pipe_is_enabled() helper,
so that it can be re-used without copy-pasting it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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

@@ -303,17 +303,13 @@ intel_wait_for_pipe_off(const struct intel_crtc_state *old_crtc_state)
 	}
 }
 
-void assert_transcoder(struct drm_i915_private *dev_priv,
-		       enum transcoder cpu_transcoder, bool state)
+bool intel_pipe_is_enabled(struct drm_i915_private *dev_priv,
+			   enum transcoder cpu_transcoder)
 {
 	bool cur_state;
 	enum intel_display_power_domain power_domain;
 	intel_wakeref_t wakeref;
 
-	/* we keep both pipes enabled on 830 */
-	if (IS_I830(dev_priv))
-		state = true;
-
 	power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
 	wakeref = intel_display_power_get_if_enabled(dev_priv, power_domain);
 	if (wakeref) {
@@ -325,6 +321,18 @@ void assert_transcoder(struct drm_i915_private *dev_priv,
 		cur_state = false;
 	}
 
+	return cur_state;
+}
+
+void assert_transcoder(struct drm_i915_private *dev_priv,
+		       enum transcoder cpu_transcoder, bool state)
+{
+	bool cur_state = intel_pipe_is_enabled(dev_priv, cpu_transcoder);
+
+	/* we keep both pipes enabled on 830 */
+	if (IS_I830(dev_priv))
+		state = true;
+
 	I915_STATE_WARN(dev_priv, cur_state != state,
 			"transcoder %s assertion failure (expected %s, current %s)\n",
 			transcoder_name(cpu_transcoder), str_on_off(state),

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

@@ -424,6 +424,8 @@ void intel_enable_transcoder(const struct intel_crtc_state *new_crtc_state);
 void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state);
 void i830_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe);
 void i830_disable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe);
+bool intel_pipe_is_enabled(struct drm_i915_private *dev_priv,
+			   enum transcoder cpu_transcoder);
 int vlv_get_hpll_vco(struct drm_i915_private *dev_priv);
 int vlv_get_cck_clock(struct drm_i915_private *dev_priv,
 		      const char *name, u32 reg, int ref_freq);