From 8a517b1e6d8bdde298a7006234c8188c6fb43747 Mon Sep 17 00:00:00 2001 From: Ankit Nautiyal Date: Wed, 4 Feb 2026 10:32:48 +0530 Subject: [PATCH] drm/i915/alpm: Allow LOBF only for platform that have Always on VRR TG MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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: Ankit Nautiyal Reviewed-by: Michał Grzelak Link: https://patch.msgid.link/20260204050250.762718-4-ankit.k.nautiyal@intel.com --- drivers/gpu/drm/i915/display/intel_alpm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c index 27b26e5813dc..3aeab4bebce2 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.c +++ b/drivers/gpu/drm/i915/display/intel_alpm.c @@ -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) ||