drm/i915/vrr: Split vrr-compute-config in two phases

As vrr guardband calculation is dependent on modified
vblank start so better to compute late after all
vblank adjustement.

v1: Initial version.
v2: Split in a separate patch from panel-replay workaround. [Ankit]
v3: Add a function for late vrr related computation. [Ville]
v4: Use flipline instead of vrr.enable and some cosmetic changes. [Ville]
v5: Use intel_vrr_possible helper.

Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
[vsyrjala: Make adjusted_mode const]
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241010040503.1795399-3-mitulkumar.ajitkumar.golani@intel.com

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

@@ -5050,6 +5050,8 @@ intel_modeset_pipe_config_late(struct intel_atomic_state *state,
 	struct drm_connector *connector;
 	int i;
 
+	intel_vrr_compute_config_late(crtc_state);
+
 	for_each_new_connector_in_state(&state->base, connector,
 					conn_state, i) {
 		struct intel_encoder *encoder =

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

@@ -244,11 +244,16 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 			(crtc_state->hw.adjusted_mode.crtc_vtotal -
 			 crtc_state->hw.adjusted_mode.vsync_end);
 	}
+}
+
+void intel_vrr_compute_config_late(struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+
+	if (!intel_vrr_possible(crtc_state))
+		return;
 
-	/*
-	 * For XE_LPD+, we use guardband and pipeline override
-	 * is deprecated.
-	 */
 	if (DISPLAY_VER(display) >= 13) {
 		crtc_state->vrr.guardband =
 			crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vblank_start;

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

@@ -19,6 +19,7 @@ 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);
+void intel_vrr_compute_config_late(struct intel_crtc_state *crtc_state);
 void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state);
 void intel_vrr_enable(const struct intel_crtc_state *crtc_state);
 void intel_vrr_send_push(const struct intel_crtc_state *crtc_state);