[PATCH 18/18] drm/amd/display: Do VRR transition before enable_crc_interrupts

[sunpeng.li at amd.com]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]
Originally we did the amdgpu_dm_handle_vrr_transition call before
interrupts were enabled. After the interrupt toggling logic was
moved around for support enabling CRTCs with no primary planes
active this was no longer being called in the case where there
wasn't a modeset.

This fixes failures in igt at kms_vrr@* with error
"Timed out: Waiting for vblank event".

[How]
Shift them back into the loop that always ran before interrupts were
enabled.

Pull out the logic that updated VRR state into the same loop since
there's no reason these need to be split.

In the case where we're going from VRR off, no planes to VRR on, some
active planes we'll still be covered for having the VRR vupdate
handler enabled - vblank will be re-enabled at this point, it will
see that VRR is active and set the vupdate interrupt on there.

Change-Id: I957b29f2a3c2975287eaf9203dfb4ba7905c1fec
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Reviewed-by: David Francis <David.Francis at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f521864..36bbbea 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5572,10 +5572,6 @@ static void amdgpu_dm_enable_crtc_interrupts(struct drm_device *dev,
 		if (!run_pass)
 			continue;
 
-		/* Handle vrr on->off / off->on transitions */
-		amdgpu_dm_handle_vrr_transition(dm_old_crtc_state,
-						dm_new_crtc_state);
-
 		if (!dm_new_crtc_state->interrupts_enabled)
 			continue;
 
@@ -5865,18 +5861,23 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 		mutex_unlock(&dm->dc_lock);
 	}
 
-	/* Update freesync state before amdgpu_dm_handle_vrr_transition(). */
-	for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
-		dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
-		pre_update_freesync_state_on_stream(dm, dm_new_crtc_state);
-	}
-
 	/* Count number of newly disabled CRTCs for dropping PM refs later. */
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
-				      new_crtc_state, i)
+				      new_crtc_state, i) {
 		if (old_crtc_state->active && !new_crtc_state->active)
 			crtc_disable_count++;
 
+		dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
+		dm_old_crtc_state = to_dm_crtc_state(old_crtc_state);
+
+		/* Update freesync active state. */
+		pre_update_freesync_state_on_stream(dm, dm_new_crtc_state);
+
+		/* Handle vrr on->off / off->on transitions */
+		amdgpu_dm_handle_vrr_transition(dm_old_crtc_state,
+						dm_new_crtc_state);
+	}
+
 	/* Enable interrupts for CRTCs going through a modeset. */
 	amdgpu_dm_enable_crtc_interrupts(dev, state, true);
 
-- 
2.7.4