Commit 8a517b1e authored by Ankit Nautiyal's avatar Ankit Nautiyal
Browse files

drm/i915/alpm: Allow LOBF only for platform that have Always on VRR TG 



As per bspec the LOBF is allowed when running in fixed refresh rate mode
i.e. when flipline = vmin = vmax and when window1 is non zero. This
implies that we can allow LOBF only when VRR timing generator is running
in the fixed refresh rate mode.

Use the check intel_vrr_always_use_vrr_tg() to avoid LOBF with legacy
timing generator. Also use intel_vrr_is_fixed_rr() to check for fixed
refresh rate mode.

v2: Modify commit message to clarify window1 requirement for LOBF.
(Ville)

Signed-off-by: default avatarAnkit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: default avatarMichał Grzelak <michal.grzelak@intel.com>
Link: https://patch.msgid.link/20260204050250.762718-4-ankit.k.nautiyal@intel.com
parent 79ee2fbb

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

+2 −2
Original line number Diff line number Diff line
@@ -351,8 +351,8 @@ void intel_alpm_lobf_compute_config(struct intel_dp *intel_dp, 
	if (crtc_state->has_psr)

		return;



	if (crtc_state->vrr.vmin != crtc_state->vrr.vmax ||

	    crtc_state->vrr.vmin != crtc_state->vrr.flipline)

	if (!intel_vrr_always_use_vrr_tg(display) ||

	    !intel_vrr_is_fixed_rr(crtc_state))

		return;



	if (!(intel_alpm_aux_wake_supported(intel_dp) ||