drm/i915/dp: Gate UHBR SST SDP splitting on sink capability

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SDP splitting for 128b/132b (UHBR) SST audio must only be enabled when
the sink advertises support for it. Previously sdp_split_enable
was set for every UHBR SST stream carrying audio, regardless of sink
capability.

In MST mode SDP splitting is inherently supported, so the sink
capability check (DP_SST_SPLIT_SDP_CAP) is applied only to the SST path.

Fixes: 8853750dba ("drm/i915: Enable SDP split for DP2.0")
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260825073204.872441-1-mitulkumar.ajitkumar.golani@intel.com
(cherry picked from commit b37921c9f5)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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This commit is contained in:

Mitul Golani 2026-08-25 13:02:04 +05:30 • committed by Jani Nikula

parent df2908090c

commit a894f97318

2 changed files with 40 additions and 6 deletions

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2

drivers/gpu/drm/i915/display/intel_display_types.h

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44

drivers/gpu/drm/i915/display/intel_dp.c

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