[PATCH 1/3][SRU][Oracular] drm/amd/display: Run idle optimizations at end of vblank handler

[You-Sheng Yang]

From: Leo Li <sunpeng.li at amd.com>

BugLink: https://bugs.launchpad.net/bugs/2089556

[Why & How]
1. After allowing idle optimizations, hw programming is disallowed.
2. Before hw programming, we need to disallow idle optimizations.

Otherwise, in scenario 1, we will immediately kick hw out of idle
optimizations with register access.

Scenario 2 is less of a concern, since any register access will kick
hw out of idle optimizations. But we'll do it early for correctness.

Signed-off-by: Leo Li <sunpeng.li at amd.com>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler at amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
(cherry picked from commit 17e68f89132b9ee4b144358b49e5df404b314181)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c   | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
index 99014339aaa39..e4bb9d2ca5dc6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
@@ -251,9 +251,10 @@ static void amdgpu_dm_crtc_vblank_control_worker(struct work_struct *work)
 	else if (dm->active_vblank_irq_count)
 		dm->active_vblank_irq_count--;
 
-	dc_allow_idle_optimizations(dm->dc, dm->active_vblank_irq_count == 0);
-
-	DRM_DEBUG_KMS("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0);
+	if (dm->active_vblank_irq_count > 0) {
+		DRM_DEBUG_KMS("Allow idle optimizations (MALL): false\n");
+		dc_allow_idle_optimizations(dm->dc, false);
+	}
 
 	/*
 	 * Control PSR based on vblank requirements from OS
@@ -272,6 +273,11 @@ static void amdgpu_dm_crtc_vblank_control_worker(struct work_struct *work)
 			vblank_work->stream->link->replay_settings.replay_feature_enabled);
 	}
 
+	if (dm->active_vblank_irq_count == 0) {
+		DRM_DEBUG_KMS("Allow idle optimizations (MALL): true\n");
+		dc_allow_idle_optimizations(dm->dc, true);
+	}
+
 	mutex_unlock(&dm->dc_lock);
 
 	dc_stream_release(vblank_work->stream);
-- 
2.45.2