drm/i915/display: Force disable DC3co when AS SDP skip frames is enabled

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Periodic AS SDP (skip frames) relies on the AS SDP still being
transmitted while Panel Replay is active. DC3co uses the idle protocol
which suppresses AS SDP transmission entirely, so the two are mutually
exclusive: leaving DC3co enabled while skip frames is programmed breaks
the periodic AS SDP and the panel never sees the slower refresh.

Add intel_alpm_pr_as_sdp_skip_frames_enabled() as the single predicate
for "skip frames will be programmed" (mirroring the gating in
lnl_alpm_configure(), including that it only applies when VRR is not
active) and use it in intel_display_power_dc3co_compute() to force the
DC3co trigger to NONE. This drops the pipe onto the
DC_STATE_EN_UPTO_DC6 target instead of DC3co whenever skip frames is
active, without touching the DC state module parameter or the allowed
DC mask, and only for the skip-frame case.

v2: Fixed Sashiko review findings

Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Tested-by: Naladala Ramanaidu <ramanaidu.naladala@intel.com>
Link: https://patch.msgid.link/20260909080810.2202879-3-uma.shankar@intel.com

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This commit is contained in:

Uma Shankar 2026-09-09 13:38:08 +05:30

parent 8dbe5c47ca

commit dc0fd724e1

3 changed files with 34 additions and 0 deletions

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23

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

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2

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

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9

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

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