drm/i915: Extract intel_bw_crtc_disable_noatomic()

Hoist the bw stuff into a separate function from
intel_crtc_disable_noatomic_complete() so that the details
are better hidden inside intel_bw.c.

We can also skip the whole thing on pre-skl since the dbuf state
isn't actually used on those platforms.

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306163420.3961-9-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -1422,6 +1422,20 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	return 0;
 }
 
+void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc)
+{
+	struct intel_display *display = to_intel_display(crtc);
+	struct intel_bw_state *bw_state =
+		to_intel_bw_state(display->bw.obj.state);
+	enum pipe pipe = crtc->pipe;
+
+	if (DISPLAY_VER(display) < 9)
+		return;
+
+	bw_state->data_rate[pipe] = 0;
+	bw_state->num_active_planes[pipe] = 0;
+}
+
 static struct intel_global_state *
 intel_bw_duplicate_state(struct intel_global_obj *obj)
 {

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

@@ -14,6 +14,7 @@
 
 struct drm_i915_private;
 struct intel_atomic_state;
+struct intel_crtc;
 struct intel_crtc_state;
 
 struct intel_dbuf_bw {
@@ -81,5 +82,6 @@ int intel_bw_calc_min_cdclk(struct intel_atomic_state *state,
 			    bool *need_cdclk_calc);
 int intel_bw_min_cdclk(struct drm_i915_private *i915,
 		       const struct intel_bw_state *bw_state);
+void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc);
 
 #endif /* __INTEL_BW_H__ */

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

@@ -156,8 +156,6 @@ static void intel_crtc_disable_noatomic_complete(struct intel_crtc *crtc)
 {
 	struct intel_display *display = to_intel_display(crtc);
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
-	struct intel_bw_state *bw_state =
-		to_intel_bw_state(i915->display.bw.obj.state);
 	struct intel_pmdemand_state *pmdemand_state =
 		to_intel_pmdemand_state(i915->display.pmdemand.obj.state);
 	struct intel_crtc_state *crtc_state =
@@ -177,9 +175,7 @@ static void intel_crtc_disable_noatomic_complete(struct intel_crtc *crtc)
 
 	intel_cdclk_crtc_disable_noatomic(crtc);
 	skl_wm_crtc_disable_noatomic(crtc);
-
-	bw_state->data_rate[pipe] = 0;
-	bw_state->num_active_planes[pipe] = 0;
+	intel_bw_crtc_disable_noatomic(crtc);
 
 	intel_pmdemand_update_port_clock(display, pmdemand_state, pipe, 0);
 }