drm/i915: clean up pipe's ddb usage in intel_crtc_disable_noatomic()

Update the ddb tracking information when we disable a pipe
during sanitization. Avoids leaving stale junk in the states.

Currently this doesn't do anything as we haven't read out this
state yet when we do the sanitization, but that will change soon.

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/20250306163420.3961-7-ville.syrjala@linux.intel.com

Author: vsyrjala

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

@@ -3848,6 +3848,8 @@ static void skl_wm_get_hw_state_and_sanitize(struct drm_i915_private *i915)
 void skl_wm_crtc_disable_noatomic(struct intel_crtc *crtc)
 {
 	struct intel_display *display = to_intel_display(crtc);
+	struct intel_crtc_state *crtc_state =
+		to_intel_crtc_state(crtc->base.state);
 	struct intel_dbuf_state *dbuf_state =
 		to_intel_dbuf_state(display->dbuf.obj.state);
 	enum pipe pipe = crtc->pipe;
@@ -3856,6 +3858,13 @@ void skl_wm_crtc_disable_noatomic(struct intel_crtc *crtc)
 		return;
 
 	dbuf_state->active_pipes &= ~BIT(pipe);
+
+	dbuf_state->weight[pipe] = 0;
+	dbuf_state->slices[pipe] = 0;
+
+	memset(&dbuf_state->ddb[pipe], 0, sizeof(dbuf_state->ddb[pipe]));
+
+	memset(&crtc_state->wm.skl.ddb, 0, sizeof(crtc_state->wm.skl.ddb));
 }
 
 void intel_wm_state_verify(struct intel_atomic_state *state,