Revert "drm/amdgpu: stop scheduler when calling hw_fini (v2)"

This reverts commit f7d6779.

This bisected regression has impacted suspend-resume stability
since 5.15-rc1. It regressed -stable via 5.14.10.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=215315
Fixes: f7d6779 ("drm/amdgpu: stop scheduler when calling hw_fini (v2)")
Cc: Guchun Chen <[email protected]>
Cc: Andrey Grodzovsky <[email protected]>
Cc: Christian Koenig <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: <[email protected]> # 5.14+
Signed-off-by: Len Brown <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: lenb

drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

@@ -547,9 +547,6 @@ void amdgpu_fence_driver_hw_fini(struct amdgpu_device *adev)
 		if (!ring || !ring->fence_drv.initialized)
 			continue;
 
-		if (!ring->no_scheduler)
-			drm_sched_stop(&ring->sched, NULL);
-
 		/* You can't wait for HW to signal if it's gone */
 		if (!drm_dev_is_unplugged(adev_to_drm(adev)))
 			r = amdgpu_fence_wait_empty(ring);
@@ -609,11 +606,6 @@ void amdgpu_fence_driver_hw_init(struct amdgpu_device *adev)
 		if (!ring || !ring->fence_drv.initialized)
 			continue;
 
-		if (!ring->no_scheduler) {
-			drm_sched_resubmit_jobs(&ring->sched);
-			drm_sched_start(&ring->sched, true);
-		}
-
 		/* enable the interrupt */
 		if (ring->fence_drv.irq_src)
 			amdgpu_irq_get(adev, ring->fence_drv.irq_src,