[PATCH 3/3] drm/i915/display: Compute and Enable AS SDP

[Mitul Golani]

Add necessary functions definitions to enable
and compute AS SDP data. The new `intel_dp_compute_as_sdp`
function computes AS SDP values based on the display
configuration, ensuring proper handling of Variable Refresh
Rate (VRR).

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c |  3 +++
 drivers/gpu/drm/i915/display/intel_dp.c  | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 38f28c480b38..193fe451fc2e 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3918,6 +3918,9 @@ static void intel_ddi_get_config(struct intel_encoder *encoder,
 	intel_read_dp_sdp(encoder, pipe_config, HDMI_PACKET_TYPE_GAMUT_METADATA);
 	intel_read_dp_sdp(encoder, pipe_config, DP_SDP_VSC);
 
+	if (DISPLAY_VER(dev_priv) > 13)
+		intel_read_dp_sdp(encoder, pipe_config, DP_SDP_ADAPTIVE_SYNC);
+
 	intel_psr_get_config(encoder, pipe_config);
 
 	intel_audio_codec_get_config(encoder, pipe_config);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 6efaec982241..3d2f97125586 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2626,6 +2626,25 @@ static void intel_dp_compute_vsc_sdp(struct intel_dp *intel_dp,
 					 &crtc_state->infoframes.vsc);
 }
 
+static void intel_dp_compute_as_sdp(struct intel_dp *intel_dp,
+				    struct intel_crtc_state *crtc_state,
+				    const struct drm_connector_state *conn_state)
+{
+	struct drm_dp_as_sdp *as_sdp = &crtc_state->infoframes.as_sdp;
+	struct intel_connector *connector = intel_dp->attached_connector;
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int vrefresh = drm_mode_vrefresh(adjusted_mode);
+
+	if (intel_vrr_is_in_range(connector, vrefresh))
+		return;
+
+	crtc_state->infoframes.enable |= intel_hdmi_infoframe_enable(DP_SDP_ADAPTIVE_SYNC);
+	as_sdp->sdp_type = DP_SDP_ADAPTIVE_SYNC;
+	as_sdp->length = 0x9;
+	as_sdp->vtotal = adjusted_mode->vtotal;
+}
+
 void intel_dp_compute_psr_vsc_sdp(struct intel_dp *intel_dp,
 				  const struct intel_crtc_state *crtc_state,
 				  const struct drm_connector_state *conn_state,
@@ -2955,6 +2974,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	intel_psr_compute_config(intel_dp, pipe_config, conn_state);
 	intel_dp_drrs_compute_config(connector, pipe_config, link_bpp_x16);
 	intel_dp_compute_vsc_sdp(intel_dp, pipe_config, conn_state);
+	intel_dp_compute_as_sdp(intel_dp, pipe_config, conn_state);
 	intel_dp_compute_hdr_metadata_infoframe_sdp(intel_dp, pipe_config, conn_state);
 
 	return 0;
@@ -4362,6 +4382,9 @@ void intel_dp_set_infoframes(struct intel_encoder *encoder,
 	if (!crtc_state->has_psr)
 		intel_write_dp_sdp(encoder, crtc_state, DP_SDP_VSC);
 
+	if (DISPLAY_VER(dev_priv) > 13)
+		intel_write_dp_sdp(encoder, crtc_state, DP_SDP_ADAPTIVE_SYNC);
+
 	intel_write_dp_sdp(encoder, crtc_state, HDMI_PACKET_TYPE_GAMUT_METADATA);
 }
 
-- 
2.25.1