[PATCH 5/5] drm/i915/alpm: Disable LOBF around transitioning for LRR/seamless MN

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

When enabling LRR/seamless MN disable LOBF first and re-enable
afterwards.
- pre_plane_update: if LOBF was enabled, run pre even when new==old
  whenever update_lrr || update_m_n is set (to disable LOBF before the
  transition).
- post_plane_update: run post to re-enable LOBF after the transition.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_alpm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c
index db2b9608f7f8..e3079cf7af9d 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -462,7 +462,9 @@ void intel_alpm_pre_plane_update(struct intel_atomic_state *state,
 		return;
 
 	if (!old_crtc_state->has_lobf ||
-	    crtc_state->has_lobf == old_crtc_state->has_lobf)
+	    (crtc_state->has_lobf == old_crtc_state->has_lobf &&
+	     !crtc_state->update_lrr &&
+	     !crtc_state->update_m_n))
 		return;
 
 	for_each_intel_encoder_mask(display->drm, encoder,
@@ -517,7 +519,9 @@ void intel_alpm_post_plane_update(struct intel_atomic_state *state,
 		return;
 
 	if (!crtc_state->has_lobf ||
-	    crtc_state->has_lobf == old_crtc_state->has_lobf)
+	    (crtc_state->has_lobf == old_crtc_state->has_lobf &&
+	     !crtc_state->update_lrr &&
+	     !crtc_state->update_m_n))
 		return;
 
 	for_each_intel_encoder_mask(display->drm, encoder,
-- 
2.45.2