drm/i915: Extract skl_wm_crtc_disable_noatomic()

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

We can also skip the whole thing on pre-skl since the dbuf state
isn't actually used on those platforms. The readout path does
still fill dbuf_state->active_pipes but we'll remedy that later.

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/20250306163420.3961-6-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -158,8 +158,6 @@ static void intel_crtc_disable_noatomic_complete(struct intel_crtc *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_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);
 	struct intel_crtc_state *crtc_state =
@@ -178,8 +176,7 @@ static void intel_crtc_disable_noatomic_complete(struct intel_crtc *crtc)
 	intel_display_power_put_all_in_set(display, &crtc->enabled_power_domains);
 
 	intel_cdclk_crtc_disable_noatomic(crtc);
-
-	dbuf_state->active_pipes &= ~BIT(pipe);
+	skl_wm_crtc_disable_noatomic(crtc);
 
 	bw_state->data_rate[pipe] = 0;
 	bw_state->num_active_planes[pipe] = 0;

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

@@ -3845,6 +3845,19 @@ static void skl_wm_get_hw_state_and_sanitize(struct drm_i915_private *i915)
 	skl_dbuf_sanitize(i915);
 }
 
+void skl_wm_crtc_disable_noatomic(struct intel_crtc *crtc)
+{
+	struct intel_display *display = to_intel_display(crtc);
+	struct intel_dbuf_state *dbuf_state =
+		to_intel_dbuf_state(display->dbuf.obj.state);
+	enum pipe pipe = crtc->pipe;
+
+	if (DISPLAY_VER(display) < 9)
+		return;
+
+	dbuf_state->active_pipes &= ~BIT(pipe);
+}
+
 void intel_wm_state_verify(struct intel_atomic_state *state,
 			   struct intel_crtc *crtc)
 {

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

@@ -41,6 +41,8 @@ bool skl_ddb_allocation_overlaps(const struct skl_ddb_entry *ddb,
 void intel_wm_state_verify(struct intel_atomic_state *state,
 			   struct intel_crtc *crtc);
 
+void skl_wm_crtc_disable_noatomic(struct intel_crtc *crtc);
+
 void skl_watermark_ipc_init(struct drm_i915_private *i915);
 void skl_watermark_ipc_update(struct drm_i915_private *i915);
 bool skl_watermark_ipc_enabled(struct drm_i915_private *i915);