drm/i915/bw: abstract intel_bw_pmdemand_needs_update()

Add intel_bw_pmdemand_needs_update() helper to avoid looking at struct
intel_bw_state internals outside of intel_bw.c.

Reviewed-by: Imre Deak <[e-mail]>
Link: https://lore.kernel.org/r/163[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

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

···
 
 	return 0;
 }
+
+bool intel_bw_pmdemand_needs_update(struct intel_atomic_state *state)
+{
+	const struct intel_bw_state *new_bw_state, *old_bw_state;
+
+	new_bw_state = intel_atomic_get_new_bw_state(state);
+	old_bw_state = intel_atomic_get_old_bw_state(state);
+
+	if (new_bw_state &&
+	    new_bw_state->qgv_point_peakbw != old_bw_state->qgv_point_peakbw)
+		return true;
+
+	return false;
+}

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

···
 void intel_bw_update_hw_state(struct intel_display *display);
 void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc);
 
+bool intel_bw_pmdemand_needs_update(struct intel_atomic_state *state);
+
 #endif /* __INTEL_BW_H__ */

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

···
 
 static bool intel_pmdemand_needs_update(struct intel_atomic_state *state)
 {
-	const struct intel_bw_state *new_bw_state, *old_bw_state;
 	const struct intel_cdclk_state *new_cdclk_state, *old_cdclk_state;
 	const struct intel_crtc_state *new_crtc_state, *old_crtc_state;
 	struct intel_crtc *crtc;
 	int i;
 
-	new_bw_state = intel_atomic_get_new_bw_state(state);
-	old_bw_state = intel_atomic_get_old_bw_state(state);
-	if (new_bw_state && new_bw_state->qgv_point_peakbw !=
-	    old_bw_state->qgv_point_peakbw)
+	if (intel_bw_pmdemand_needs_update(state))
 		return true;
 
 	if (intel_dbuf_pmdemand_needs_update(state))