[PATCH 4/6] drm/i915/display: Compute and Enable AS SDP

[Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>]

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).

--v2:
- Add DP_SDP_ADAPTIVE_SYNC to infoframe_type_to_idx().[Ankit]
- separate patch for intel_read/write_dp_sdp [Ankit].
- _HSW_VIDEO_DIP_ASYNC_DATA_A should be from ADL onward [Ankit]
- To fix indentation [Ankit]

--v3:
- Add VIDEO_DIP_ENABLE_AS_HSW flag to intel_dp_set_infoframes.

--v4:
- Add HAS_VRR check before write as sdp.

--v5:
- Add missed HAS_VRR check before read as sdp.

--v6:
Use Adaptive Sync sink status, which can be
used as a check for read/write sdp. (Ankit)

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d68fb9d45054..0759266e7bfb 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2617,6 +2617,25 @@ static void intel_dp_compute_vsc_colorimetry(const struct intel_crtc_state *crtc
 	vsc->content_type = DP_CONTENT_TYPE_NOT_DEFINED;
 }
 
+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;
+}
+
 static void intel_dp_compute_vsc_sdp(struct intel_dp *intel_dp,
 				     struct intel_crtc_state *crtc_state,
 				     const struct drm_connector_state *conn_state)
@@ -2942,6 +2961,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 		g4x_dp_set_clock(encoder, pipe_config);
 
 	intel_vrr_compute_config(pipe_config, conn_state);
+	intel_dp_compute_as_sdp(intel_dp, pipe_config, conn_state);
 	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);
-- 
2.25.1