drm/i915: Move dbuf_state->active_pipes into skl_wm_get_hw_state()

Move the dbuf_state readout parts into skl_wm_get_hw_state()
so that the details are better hidden from sight.

This will stop updating this on pre-skl, but that's what we want
since the dbuf state is only used on skl+.

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/20250306163420.3961-18-ville.syrjala@linux.intel.com

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

@@ -693,16 +693,13 @@ static void readout_plane_state(struct drm_i915_private *i915)
 static void intel_modeset_readout_hw_state(struct drm_i915_private *i915)
 {
 	struct intel_display *display = &i915->display;
-	struct intel_dbuf_state *dbuf_state =
-		to_intel_dbuf_state(i915->display.dbuf.obj.state);
 	struct intel_pmdemand_state *pmdemand_state =
 		to_intel_pmdemand_state(i915->display.pmdemand.obj.state);
 	enum pipe pipe;
 	struct intel_crtc *crtc;
 	struct intel_encoder *encoder;
 	struct intel_connector *connector;
 	struct drm_connector_list_iter conn_iter;
-	u8 active_pipes = 0;
 
 	for_each_intel_crtc(&i915->drm, crtc) {
 		struct intel_crtc_state *crtc_state =
@@ -719,17 +716,12 @@ static void intel_modeset_readout_hw_state(struct drm_i915_private *i915)
 		crtc->base.enabled = crtc_state->hw.enable;
 		crtc->active = crtc_state->hw.active;
 
-		if (crtc_state->hw.active)
-			active_pipes |= BIT(crtc->pipe);
-
 		drm_dbg_kms(&i915->drm,
 			    "[CRTC:%d:%s] hw state readout: %s\n",
 			    crtc->base.base.id, crtc->base.name,
 			    str_enabled_disabled(crtc_state->hw.active));
 	}
 
-	dbuf_state->active_pipes = active_pipes;
-
 	readout_plane_state(i915);
 
 	for_each_intel_encoder(&i915->drm, encoder) {

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

@@ -3157,6 +3157,7 @@ static void skl_wm_get_hw_state(struct drm_i915_private *i915)
 		dbuf_state->joined_mbus = intel_de_read(display, MBUS_CTL) & MBUS_JOIN;
 
 	dbuf_state->mdclk_cdclk_ratio = intel_mdclk_cdclk_ratio(display, &display->cdclk.hw);
+	dbuf_state->active_pipes = 0;
 
 	for_each_intel_crtc(display->drm, crtc) {
 		struct intel_crtc_state *crtc_state =
@@ -3168,8 +3169,10 @@ static void skl_wm_get_hw_state(struct drm_i915_private *i915)
 
 		memset(&crtc_state->wm.skl.optimal, 0,
 		       sizeof(crtc_state->wm.skl.optimal));
-		if (crtc_state->hw.active)
+		if (crtc_state->hw.active) {
 			skl_pipe_wm_get_hw_state(crtc, &crtc_state->wm.skl.optimal);
+			dbuf_state->active_pipes |= BIT(pipe);
+		}
 		crtc_state->wm.skl.raw = crtc_state->wm.skl.optimal;
 
 		memset(&dbuf_state->ddb[pipe], 0, sizeof(dbuf_state->ddb[pipe]));