[PATCH 4/6] drm/i915/display: Compute AS SDP parameters.

[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).

--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 at intel.com>
---
 .../drm/i915/display/intel_display_types.h    |  1 +
 drivers/gpu/drm/i915/display/intel_dp.c       | 28 +++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_vrr.c      |  4 ++-
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 2accfe41160d..93b4b7dff1d0 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1415,6 +1415,7 @@ struct intel_crtc_state {
 		u8 pipeline_full;
 		u16 flipline, vmin, vmax, guardband;
 		u8 as_sdp_mode;
+		bool as_sdp_enable;
 	} vrr;
 
 	/* Stream Splitter for eDP MSO */
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b370e1da4735..5c1e2301dd52 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2617,6 +2617,33 @@ 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) || !crtc_state->vrr.as_sdp_enable)
+		return;
+
+	as_sdp->sdp_type = DP_SDP_ADAPTIVE_SYNC;
+	as_sdp->length = 0x9;
+	as_sdp->mode = crtc_state->vrr.as_sdp_mode;
+	as_sdp->vtotal = adjusted_mode->vtotal;
+
+	if (as_sdp->mode == DP_AS_SDP_AVT_FIXED_VTOTAL) {
+		as_sdp->target_rr = 0;
+		as_sdp->duration_incr_ms = 0;
+		as_sdp->duration_incr_ms = 0;
+	}
+
+	crtc_state->infoframes.enable |= intel_hdmi_infoframe_enable(DP_SDP_ADAPTIVE_SYNC);
+}
+
 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 +2969,7 @@ 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);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index d2ab7e571e62..08e3ba69bd30 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -167,9 +167,11 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 		crtc_state->vrr.enable = true;
 		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
 
-		if (drm_dp_as_sdp_supported(&intel_dp->aux, intel_dp->dpcd))
+		if (drm_dp_as_sdp_supported(&intel_dp->aux, intel_dp->dpcd)) {
+			crtc_state->vrr.as_sdp_enable = true;
 			crtc_state->vrr.as_sdp_mode =
 						DP_AS_SDP_AVT_DYNAMIC_VTOTAL;
+		}
 	}
 }
 
-- 
2.25.1