[RFC v4 12/16] drm/i915/ddi: enable ACT handling for 128b/132b SST

[Jani Nikula]

Add ACT handling for 128b/132b SST.

This is preparation for enabling 128b/132b SST. This path is not
reachable yet.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 91e6cd91e91f..7b739b9c5a06 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3486,6 +3486,19 @@ static void intel_ddi_enable(struct intel_atomic_state *state,
 	/* Enable/Disable DP2.0 SDP split config before transcoder */
 	intel_audio_sdp_split_update(crtc_state);
 
+	/* 128b/132b SST */
+	if (intel_dp_is_uhbr(crtc_state)) {
+		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+		intel_ddi_clear_act_sent(encoder, crtc_state);
+
+		intel_de_rmw(display, TRANS_DDI_FUNC_CTL(display, cpu_transcoder), 0,
+			     TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
+
+		intel_ddi_wait_for_act_sent(encoder, crtc_state);
+		drm_dp_dpcd_poll_act_handled(&intel_dp->aux, 0);
+	}
+
 	intel_enable_transcoder(crtc_state);
 
 	intel_ddi_wait_for_fec_status(encoder, crtc_state, true);
-- 
2.39.5