drm/i915/dsb: Allow vblank synchronized DSB execution

Allow the caller to ask for the DSB commands to execute
during vblank.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118163040.29808-7-ville.syrjala@linux.intel.comReviewed-by: Animesh Manna <animesh.manna@intel.com>

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

@@ -1258,7 +1258,7 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
 
 	if (crtc_state->dsb) {
 		intel_dsb_finish(crtc_state->dsb);
-		intel_dsb_commit(crtc_state->dsb);
+		intel_dsb_commit(crtc_state->dsb, false);
 		intel_dsb_wait(crtc_state->dsb);
 	}
 }

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

@@ -221,10 +221,11 @@ void intel_dsb_finish(struct intel_dsb *dsb)
 /**
  * intel_dsb_commit() - Trigger workload execution of DSB.
  * @dsb: DSB context
+ * @wait_for_vblank: wait for vblank before executing
  *
  * This function is used to do actual write to hardware using DSB.
  */
-void intel_dsb_commit(struct intel_dsb *dsb)
+void intel_dsb_commit(struct intel_dsb *dsb, bool wait_for_vblank)
 {
 	struct intel_crtc *crtc = dsb->crtc;
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -242,6 +243,7 @@ void intel_dsb_commit(struct intel_dsb *dsb)
 	}
 
 	intel_de_write(dev_priv, DSB_CTRL(pipe, dsb->id),
+		       (wait_for_vblank ? DSB_WAIT_FOR_VBLANK : 0) |
 		       DSB_ENABLE);
 	intel_de_write(dev_priv, DSB_HEAD(pipe, dsb->id),
 		       i915_ggtt_offset(dsb->vma));

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

@@ -19,7 +19,8 @@ void intel_dsb_finish(struct intel_dsb *dsb);
 void intel_dsb_cleanup(struct intel_dsb *dsb);
 void intel_dsb_reg_write(struct intel_dsb *dsb,
 			 i915_reg_t reg, u32 val);
-void intel_dsb_commit(struct intel_dsb *dsb);
+void intel_dsb_commit(struct intel_dsb *dsb,
+		      bool wait_for_vblank);
 void intel_dsb_wait(struct intel_dsb *dsb);
 
 #endif