[PATCH v2 2/5] drm/i915/adlp+/dp_mst: Align slave transcoder enabling with spec wrt. DDI function

Imre Deak
2024-10-30T19:22:53Z

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.

Align the code with the spec based on the above.

v2: Move this patch earlier in the series, addressing the DP2
config fixes for all ADLP+ platforms later.

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

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 7c16406883594..bf264bd1881b5 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1224,7 +1224,7 @@ 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_func(encoder, pipe_config);

intel_dsc_dp_pps_write(&dig_port->base, pipe_config);
--
2.44.2