drm/i915/vrr: Add helper to check if vrr possible

Add helper to check if vrr is possible based on flipline
is computed.

--v1:
return just flipline instead using ternary operator [Jonathan, Ville].

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241010040503.1795399-2-mitulkumar.ajitkumar.golani@intel.com

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

@@ -56,6 +56,11 @@ bool intel_vrr_is_in_range(struct intel_connector *connector, int vrefresh)
 		vrefresh <= info->monitor_range.max_vfreq;
 }
 
+bool intel_vrr_possible(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->vrr.flipline;
+}
+
 void
 intel_vrr_check_modeset(struct intel_atomic_state *state)
 {
@@ -281,7 +286,7 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 		intel_de_rmw(display, CHICKEN_TRANS(cpu_transcoder),
 			     0, PIPE_VBLANK_WITH_DELAY);
 
-	if (!crtc_state->vrr.flipline) {
+	if (!intel_vrr_possible(crtc_state)) {
 		intel_de_write(display,
 			       TRANS_VRR_CTL(display, cpu_transcoder), 0);
 		return;

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

@@ -15,6 +15,7 @@ struct intel_crtc_state;
 
 bool intel_vrr_is_capable(struct intel_connector *connector);
 bool intel_vrr_is_in_range(struct intel_connector *connector, int vrefresh);
+bool intel_vrr_possible(const struct intel_crtc_state *crtc_state);
 void intel_vrr_check_modeset(struct intel_atomic_state *state);
 void intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 			      struct drm_connector_state *conn_state);