drm/i915: Extract intel_bw_update_hw_state()

Hoist the bw stuff into a separate function from
intel_modeset_readout_hw_state() 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/20250306163420.3961-11-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -806,8 +806,8 @@ static int intel_bw_crtc_min_cdclk(const struct intel_crtc_state *crtc_state)
 	return DIV_ROUND_UP_ULL(mul_u32_u32(intel_bw_crtc_data_rate(crtc_state), 10), 512);
 }
 
-void intel_bw_crtc_update(struct intel_bw_state *bw_state,
-			  const struct intel_crtc_state *crtc_state)
+static void intel_bw_crtc_update(struct intel_bw_state *bw_state,
+				 const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
@@ -1422,6 +1422,23 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	return 0;
 }
 
+void intel_bw_update_hw_state(struct intel_display *display)
+{
+	struct intel_bw_state *bw_state =
+		to_intel_bw_state(display->bw.obj.state);
+	struct intel_crtc *crtc;
+
+	if (DISPLAY_VER(display) < 9)
+		return;
+
+	for_each_intel_crtc(display->drm, crtc) {
+		const struct intel_crtc_state *crtc_state =
+			to_intel_crtc_state(crtc->base.state);
+
+		intel_bw_crtc_update(bw_state, crtc_state);
+	}
+}
+
 void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc)
 {
 	struct intel_display *display = to_intel_display(crtc);

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

@@ -16,6 +16,7 @@ struct drm_i915_private;
 struct intel_atomic_state;
 struct intel_crtc;
 struct intel_crtc_state;
+struct intel_display;
 
 struct intel_dbuf_bw {
 	unsigned int max_bw[I915_MAX_DBUF_SLICES];
@@ -74,14 +75,13 @@ intel_atomic_get_bw_state(struct intel_atomic_state *state);
 void intel_bw_init_hw(struct drm_i915_private *dev_priv);
 int intel_bw_init(struct drm_i915_private *dev_priv);
 int intel_bw_atomic_check(struct intel_atomic_state *state);
-void intel_bw_crtc_update(struct intel_bw_state *bw_state,
-			  const struct intel_crtc_state *crtc_state);
 int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
 				  u32 points_mask);
 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_update_hw_state(struct intel_display *display);
 void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc);
 
 #endif /* __INTEL_BW_H__ */

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

@@ -825,8 +825,6 @@ static void intel_modeset_readout_hw_state(struct drm_i915_private *i915)
 	drm_connector_list_iter_end(&conn_iter);
 
 	for_each_intel_crtc(&i915->drm, crtc) {
-		struct intel_bw_state *bw_state =
-			to_intel_bw_state(i915->display.bw.obj.state);
 		struct intel_crtc_state *crtc_state =
 			to_intel_crtc_state(crtc->base.state);
 		struct intel_plane *plane;
@@ -880,10 +878,9 @@ static void intel_modeset_readout_hw_state(struct drm_i915_private *i915)
 
 		intel_pmdemand_update_port_clock(display, pmdemand_state, pipe,
 						 crtc_state->port_clock);
-
-		intel_bw_crtc_update(bw_state, crtc_state);
 	}
 
+	intel_bw_update_hw_state(display);
 	intel_cdclk_update_hw_state(display);
 
 	intel_pmdemand_init_pmdemand_params(display, pmdemand_state);