[PATCH 4/4] drm/i915/adlp+: Align slave transcoder sequences with spec wrt. DDI function/DP2 config

[Imre Deak]

On ADLP+ during modeset enabling configure the DDI function without
enabling it for MST slave transcoders before programming the data and
link M/N values. The DDI function gets enabled separately later in the
transcoder enabling sequence.

Also for these platforms the DP2 configuration needs to be
enabled/disabled during enabling/disabling MST slave transcoders.

Align the code with the spec wrt. the above DDI function and DP2
configuration programming.

Bspec: 55424, 54128, 65448, 68849
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index b1eee8500a383..089ed457621e7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1057,7 +1057,7 @@ static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
 
 	intel_ddi_disable_transcoder_func(old_crtc_state);
 
-	if (DISPLAY_VER(dev_priv) >= 30 && !last_mst_stream)
+	if (DISPLAY_VER(dev_priv) >= 13 && !last_mst_stream)
 		intel_ddi_config_transcoder_dp2(encoder, old_crtc_state, false);
 
 	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
@@ -1227,7 +1227,7 @@ static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
 	if (DISPLAY_VER(dev_priv) < 12 || !first_mst_stream)
 		intel_ddi_enable_transcoder_clock(encoder, pipe_config);
 
-	if (DISPLAY_VER(dev_priv) >= 30 && !first_mst_stream) {
+	if (DISPLAY_VER(dev_priv) >= 13 && !first_mst_stream) {
 		intel_ddi_config_transcoder_dp2(encoder, pipe_config, true);
 		intel_ddi_config_transcoder_func(encoder, pipe_config);
 	}
-- 
2.44.2