drm/i915/dip: Add helper to get AS SDP Transmission Line

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Introduce a DIP helper to compute the Adaptive Sync SDP transmission line
and use it when programming the EMP_AS_SDP_TL register.

Currently the AS SDP transmission line is programmed to the T1 position.
This can be extended in the future to support programming the T2 position
as well.

While at it, improve the documentation: the AS SDP transmission line
corresponds to the T1 position, which maps to the start of the VSYNC
pulse.

v2:
- Move the helper into intel_dip.c and make it static, since intel_dip.c
  is its only caller.
- Drop the now unused prototype from intel_dp.h.
- Add the check HAS_EMP_AS_SDP_TL(). (Suraj)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> (#v1)
Link: https://patch.msgid.link/20260915164657.3429075-5-ankit.k.nautiyal@intel.com

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This commit is contained in:

Ankit Nautiyal 2026-09-15 22:16:45 +05:30

parent c23ee65d20

commit 538f65410e

1 changed files with 18 additions and 1 deletions

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

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