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drm/i915/alpm: Allow LOBF only if window1 > alpm check_entry lines

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LOBF must be disabled if the number of lines within Window 1 is not greater
than ALPM_CTL[ALPM Entry Check]

v2: Consider the case where SCL is in the active region. (Ville)

Bspec:71041
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/20260204050250.762718-3-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2026-02-04 10:32:47 +05:30
parent 32c471e8f0
commit 79ee2fbb8e
1 changed files with 22 additions and 0 deletions
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22
drivers/gpu/drm/i915/display/intel_alpm.c
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@ -270,6 +270,23 @@ int intel_alpm_lobf_min_guardband(struct intel_crtc_state *crtc_state)
return first_sdp_position + waketime_in_lines + crtc_state->set_context_latency;
}
static bool intel_alpm_lobf_is_window1_sufficient(struct intel_crtc_state *crtc_state)
{
struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
int vblank = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vdisplay;
int window1;
/*
* LOBF must be disabled if the number of lines within Window 1 is not
* greater than ALPM_CTL[ALPM Entry Check]
*/
window1 = vblank - min(vblank,
crtc_state->vrr.guardband +
crtc_state->set_context_latency);
return window1 > crtc_state->alpm_state.check_entry_lines;
}
void intel_alpm_lobf_compute_config_late(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
{
@ -279,6 +296,11 @@ void intel_alpm_lobf_compute_config_late(struct intel_dp *intel_dp,
if (!crtc_state->has_lobf)
return;
if (!intel_alpm_lobf_is_window1_sufficient(crtc_state)) {
crtc_state->has_lobf = false;
return;
}
/*
* LOBF can only be enabled if the time from the start of the SCL+Guardband
* window to the position of the first SDP is greater than the time it takes