drm/i915: Do not call drm_crtc_arm_vblank_event in async flips

Since the flip done event will be sent in the flip_done_handler,
no need to add the event to the list and delay it for later.

v2: -Moved the async check above vblank_get as it
     was causing issues for PSR.

v3: -No need to wait for vblank to pass, as this wait was causing a
     16ms delay once every few flips.

v4: -Rebased.

v5: -Rebased.

v6: -Rebased.

v7: -No need of irq disable if we are not doing vblank evade. (Ville)

v8: -Rebased.

v9: -Move the return in intel_pipe_update_end before tracepoint. (Ville)

v10: Rebased.
Signed-off-by: Karthik B S <karthik.b.s@intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200921110210.21182-5-karthik.b.s@intel.com

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

@@ -93,6 +93,9 @@ void intel_pipe_update_start(const struct intel_crtc_state *new_crtc_state)
 	DEFINE_WAIT(wait);
 	u32 psr_status;
 
+	if (new_crtc_state->uapi.async_flip)
+		return;
+
 	vblank_start = adjusted_mode->crtc_vblank_start;
 	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
 		vblank_start = DIV_ROUND_UP(vblank_start, 2);
@@ -200,6 +203,9 @@ void intel_pipe_update_end(struct intel_crtc_state *new_crtc_state)
 	ktime_t end_vbl_time = ktime_get();
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 
+	if (new_crtc_state->uapi.async_flip)
+		return;
+
 	trace_intel_pipe_update_end(crtc, end_vbl_count, scanline_end);
 
 	/* We're still in the vblank-evade critical section, this can't race.