> -----Original Message-----
> From: Shankar, Uma <[email protected]>
> Sent: Wednesday, September 9, 2026 1:38 PM
> To: [email protected]; [email protected]; Dibin
> Moolakadan Subrahmanian <[email protected]>;
> Naladala, Ramanaidu <[email protected]>
> Cc: Shankar, Uma <[email protected]>
> Subject: [v5 0/4] drm/i915/display: Enable AS SDP Skip Frames
>
> When Panel Replay is active the transcoder timing generator runs at the
> panel's
> maximum refresh rate, but content is often presented at a lower rate. In that
> case
> the Adaptive-Sync SDP (AS SDP) only needs to reach the panel often enough to
> satisfy its maximum frame time, so transmitting it on every frame is redundant
> and shows up as repeated SDPs on the link.
>
> Xe3LPD adds a HW skip-frame counter in PR_ALPM_CTL that lets the source
> send a single AS SDP and then suppress it for a programmed number of frames.
> Program this counter so that one AS SDP is followed by (max_vrefresh /
> flip_rate
> - 1) idle frames, matching the effective content rate and allowing the link
> to be
> driven down to as low as 1Hz when the hardware supports it.
Pushed to drm-intel-next. Thanks for the reviews and testing.
Regards,
Uma Shankar
> v5: Drop module param and add debugfs
>
> v4:
> - Fix Sashiko review comments
>
> v3:
> - Add module parameter
> - Fix Skip count clearing issue (Dibin)
> - Add DC3Co checks and enabling conditions
>
> Uma Shankar (4):
> drm/i915/display: Enable periodic AS SDP skip frames
> drm/i915/display: Force disable DC3co when AS SDP skip frames is
> enabled
> drm/i915/display: Reprogram AS SDP skip frames on seamless VRR
> transitions
> drm/i915/display: Gate periodic AS SDP skip frames behind a debugfs
> knob
>
> drivers/gpu/drm/i915/display/intel_alpm.c | 154 ++++++++++++++++--
> drivers/gpu/drm/i915/display/intel_alpm.h | 3 +
> drivers/gpu/drm/i915/display/intel_display.c | 18 ++
> .../drm/i915/display/intel_display_params.h | 5 +
> .../drm/i915/display/intel_display_power.c | 9 +
> drivers/gpu/drm/i915/display/intel_psr_regs.h | 2 +
> 6 files changed, 175 insertions(+), 16 deletions(-)
>
> --
> 2.50.1
