[Intel-gfx] [PATCH 20/23] drm/i915/dp: Populate DSC PPS SDP and send PPS infoframes

[Manasi Navare]

DSC PPS secondary data packet infoframes are filled with
DSC picure parameter set metadata according to the DSC standard.
These infoframes are sent to the sink device and used during DSC
decoding.

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
---
 drivers/gpu/drm/i915/intel_vdsc.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_vdsc.c b/drivers/gpu/drm/i915/intel_vdsc.c
index 7d54991..d773057 100644
--- a/drivers/gpu/drm/i915/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/intel_vdsc.c
@@ -992,6 +992,25 @@ static void intel_configure_pps_for_dsc_encoder(struct intel_encoder *encoder,
 	}
 }
 
+static void intel_dp_send_dsc_pps_sdp(struct intel_encoder *encoder,
+				      struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+	struct drm_dsc_config *vdsc_cfg = &crtc_state->dp_dsc_cfg;
+	struct drm_dsc_pps_infoframe dp_dsc_pps_sdp;
+
+	/* Prepare DP SDP PPS header as per DP 1.4 spec, Table 2-123 */
+	drm_dsc_dp_pps_header_init(&dp_dsc_pps_sdp);
+
+	/* Fill the PPS payload bytes as per DSC spec 1.2 Table 4-1 */
+	drm_dsc_pps_infoframe_pack(&dp_dsc_pps_sdp, vdsc_cfg);
+
+	intel_dig_port->write_infoframe(&encoder->base, crtc_state,
+					DP_SDP_PPS, &dp_dsc_pps_sdp,
+					sizeof(dp_dsc_pps_sdp));
+}
+
 void intel_dsc_enable(struct intel_encoder *encoder,
 		      struct intel_crtc_state *crtc_state)
 {
@@ -1001,5 +1020,7 @@ void intel_dsc_enable(struct intel_encoder *encoder,
 
 	intel_configure_pps_for_dsc_encoder(encoder, crtc_state);
 
+	intel_dp_send_dsc_pps_sdp(encoder, crtc_state);
+
 	return;
 }
-- 
2.7.4