drm/i915/display: Cache adpative sync caps to use it later

Add new member to struct intel_dp to cache support of Adaptive Sync
SDP capabilities and use it whenever required to avoid HW access
to read capability during each atomic commit.

-v2:
- Squash both the patches

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240704082638.2302092-2-mitulkumar.ajitkumar.golani@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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

@@ -280,7 +280,7 @@ void intel_alpm_lobf_compute_config(struct intel_dp *intel_dp,
 	if (DISPLAY_VER(i915) < 20)
 		return;
 
-	if (!intel_dp_as_sdp_supported(intel_dp))
+	if (!intel_dp->as_sdp_supported)
 		return;
 
 	if (crtc_state->has_psr)

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

@@ -1806,6 +1806,7 @@ struct intel_dp {
 
 	/* connector directly attached - won't be use for modeset in mst world */
 	struct intel_connector *attached_connector;
+	bool as_sdp_supported;
 
 	struct drm_dp_tunnel *tunnel;
 	bool tunnel_suspended:1;

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

@@ -129,14 +129,6 @@ bool intel_dp_is_edp(struct intel_dp *intel_dp)
 	return dig_port->base.type == INTEL_OUTPUT_EDP;
 }
 
-bool intel_dp_as_sdp_supported(struct intel_dp *intel_dp)
-{
-	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
-
-	return HAS_AS_SDP(i915) &&
-		drm_dp_as_sdp_supported(&intel_dp->aux, intel_dp->dpcd);
-}
-
 static void intel_dp_unset_edid(struct intel_dp *intel_dp);
 
 /* Is link rate UHBR and thus 128b/132b? */
@@ -2625,8 +2617,7 @@ static void intel_dp_compute_as_sdp(struct intel_dp *intel_dp,
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 
-	if (!crtc_state->vrr.enable ||
+	if (!crtc_state->vrr.enable || intel_dp->as_sdp_supported)
-	    !intel_dp_as_sdp_supported(intel_dp))
 		return;
 
 	crtc_state->infoframes.enable |= intel_hdmi_infoframe_enable(DP_SDP_ADAPTIVE_SYNC);
@@ -5900,6 +5891,15 @@ intel_dp_detect_dsc_caps(struct intel_dp *intel_dp, struct intel_connector *conn
 					  connector);
 }
 
+static void
+intel_dp_detect_sdp_caps(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+
+	intel_dp->as_sdp_supported = HAS_AS_SDP(i915) &&
+		drm_dp_as_sdp_supported(&intel_dp->aux, intel_dp->dpcd);
+}
+
 static int
 intel_dp_detect(struct drm_connector *connector,
 		struct drm_modeset_acquire_ctx *ctx,
@@ -5958,6 +5958,8 @@ intel_dp_detect(struct drm_connector *connector,
 
 	intel_dp_detect_dsc_caps(intel_dp, intel_connector);
 
+	intel_dp_detect_sdp_caps(intel_dp);
+
 	intel_dp_mst_configure(intel_dp);
 
 	if (intel_dp->reset_link_params) {

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

@@ -85,7 +85,6 @@ void intel_dp_audio_compute_config(struct intel_encoder *encoder,
 				   struct drm_connector_state *conn_state);
 bool intel_dp_has_hdmi_sink(struct intel_dp *intel_dp);
 bool intel_dp_is_edp(struct intel_dp *intel_dp);
-bool intel_dp_as_sdp_supported(struct intel_dp *intel_dp);
 bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state);
 bool intel_dp_has_dsc(const struct intel_connector *connector);
 int intel_dp_link_symbol_size(int rate);

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

@@ -233,8 +233,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
 	}
 
-	if (intel_dp_as_sdp_supported(intel_dp) &&
+	if (intel_dp->as_sdp_supported && crtc_state->vrr.enable) {
-	    crtc_state->vrr.enable) {
 		crtc_state->vrr.vsync_start =
 			(crtc_state->hw.adjusted_mode.crtc_vtotal -
 			 crtc_state->hw.adjusted_mode.vsync_start);