drm/i915/display: Gate periodic AS SDP skip frames behind a debugfs knob

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Periodic AS SDP (skip frames) drives a Panel Replay panel down toward its
minimum refresh rate. It is a new, panel- and platform-sensitive behaviour,
so keep it opt-in rather than enabling it unconditionally.

Expose it as a per-device debugfs knob, enable_periodic_assdp, rather than a
module parameter. The behaviour is panel-specific, so the correct granularity
is per-device, not per-module. The knob is added through the intel_display_params
infrastructure (shared by i915 and xe) with a debugfs entry only. It defaults to
false (feature disabled); write 1 to the debugfs file to enable periodic AS SDP
at runtime.

Gate the feature at its single choke point, intel_pr_as_sdp_skip_frames():
returning a zero skip count when the knob is off makes both the PR_ALPM_CTL
programming (intel_alpm_configure_pr_as_sdp()) and the DC3co force-disable
predicate (intel_alpm_pr_as_sdp_skip_frames_enabled()) a no-op, so AS SDP
continues to be sent on every frame as before.

v2: Switch to debugfs entry and drop module param

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/20260909080810.2202879-5-uma.shankar@intel.com

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This commit is contained in:

Uma Shankar 2026-09-09 13:38:10 +05:30

parent eddf77ff1a

commit 9ed39b7d74

2 changed files with 10 additions and 0 deletions

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5

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

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5

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

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