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drm/i915/psr: Add helper to get min psr guardband

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Introduce a helper to compute the max link wake latency when using
Auxless/Aux wake mechanism for PSR/Panel Replay/LOBF features.

This will be used to compute the minimum guardband so that the link wake
latencies are accounted and these features work smoothly for higher
refresh rate panels.

v2:
- Account for flag `req_psr2_sdp_prior_scanline` and scl lines while
  computing min guardband. (Jouni)
- Use wake lines only for eDP with panel_replay and sel_update flags
  set. (Jouni)

Bspec: 70151, 71477
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://lore.kernel.org/r/20251017123504.2247954-2-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal
2025-10-17 18:05:00 +05:30
parent c390bf0796
commit 77fb33cb7c
2 changed files with 28 additions and 0 deletions
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27
drivers/gpu/drm/i915/display/intel_psr.c
View File

@@ -4499,3 +4499,30 @@ void intel_psr_compute_config_late(struct intel_dp *intel_dp,
intel_psr_set_non_psr_pipes(intel_dp, crtc_state);
}
int intel_psr_min_guardband(struct intel_crtc_state *crtc_state)
{
struct intel_display *display = to_intel_display(crtc_state);
int psr_min_guardband;
int wake_lines;
if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
return 0;
if (crtc_state->has_panel_replay)
wake_lines = crtc_state->alpm_state.aux_less_wake_lines;
else if (crtc_state->has_sel_update)
wake_lines = DISPLAY_VER(display) < 20 ?
psr2_block_count_lines(crtc_state->alpm_state.io_wake_lines,
crtc_state->alpm_state.fast_wake_lines) :
crtc_state->alpm_state.io_wake_lines;
else
return 0;
psr_min_guardband = wake_lines + crtc_state->set_context_latency;
if (crtc_state->req_psr2_sdp_prior_scanline)
psr_min_guardband++;
return psr_min_guardband;
}

1
drivers/gpu/drm/i915/display/intel_psr.h
View File

@@ -85,5 +85,6 @@ bool intel_psr_needs_alpm_aux_less(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state);
void intel_psr_compute_config_late(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state);
int intel_psr_min_guardband(struct intel_crtc_state *crtc_state);
#endif /* __INTEL_PSR_H__ */