[PATCH v6 4/8] drm/i915/lobf: Update lobf if any change in dependent parameters

[Animesh Manna]

For every commit the dependent condition for LOBF is checked
and accordingly update has_lobf flag which will be used
to update the ALPM_CTL register during commit.

v1: Initial version.
v2: Avoid reading h/w register without has_lobf check. [Jani]
v3: Update LOBF in post plane update instead of separate function. [Jouni]

Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/intel_alpm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c
index c2862888466f..5df1253a6b6c 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -378,9 +378,12 @@ void intel_alpm_post_plane_update(struct intel_atomic_state *state,
 	struct intel_display *display = to_intel_display(state);
 	const struct intel_crtc_state *crtc_state =
 		intel_atomic_get_new_crtc_state(state, crtc);
+	const struct intel_crtc_state *old_crtc_state =
+		intel_atomic_get_old_crtc_state(state, crtc);
 	struct intel_encoder *encoder;
 
-	if (!crtc_state->has_lobf && !crtc_state->has_psr)
+	if (!crtc_state->has_lobf && !crtc_state->has_psr &&
+	    !old_crtc_state->has_lobf)
 		return;
 
 	for_each_intel_encoder_mask(display->drm, encoder,
-- 
2.29.0