drm/amdgpu/gfx10: rework reset sequence

To match other GFX IPs.
Acked-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -6692,13 +6692,13 @@ static int gfx_v10_0_gfx_mqd_init(struct amdgpu_device *adev, void *m,
 	return 0;
 }
 
-static int gfx_v10_0_gfx_init_queue(struct amdgpu_ring *ring)
+static int gfx_v10_0_kgq_init_queue(struct amdgpu_ring *ring, bool reset)
 {
 	struct amdgpu_device *adev = ring->adev;
 	struct v10_gfx_mqd *mqd = ring->mqd_ptr;
 	int mqd_idx = ring - &adev->gfx.gfx_ring[0];
 
-	if (!amdgpu_in_reset(adev) && !adev->in_suspend) {
+	if (!reset && !amdgpu_in_reset(adev) && !adev->in_suspend) {
 		memset((void *)mqd, 0, sizeof(*mqd));
 		mutex_lock(&adev->srbm_mutex);
 		nv_grbm_select(adev, ring->me, ring->pipe, ring->queue, 0);
@@ -6750,7 +6750,7 @@ static int gfx_v10_0_cp_async_gfx_ring_resume(struct amdgpu_device *adev)
 
 		r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&ring->mqd_ptr);
 		if (!r) {
-			r = gfx_v10_0_gfx_init_queue(ring);
+			r = gfx_v10_0_kgq_init_queue(ring, false);
 			amdgpu_bo_kunmap(ring->mqd_obj);
 			ring->mqd_ptr = NULL;
 		}
@@ -9460,10 +9460,22 @@ static int gfx_v10_0_reset_kgq(struct amdgpu_ring *ring, unsigned int vmid)
 	if (r)
 		return r;
 
-	/* reset the ring */
-	ring->wptr = 0;
-	*ring->wptr_cpu_addr = 0;
-	amdgpu_ring_clear_ring(ring);
+	r = amdgpu_bo_reserve(ring->mqd_obj, false);
+	if (unlikely(r != 0)) {
+		DRM_ERROR("fail to resv mqd_obj\n");
+		return r;
+	}
+	r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&ring->mqd_ptr);
+	if (!r) {
+		r = gfx_v10_0_kgq_init_queue(ring, true);
+		amdgpu_bo_kunmap(ring->mqd_obj);
+		ring->mqd_ptr = NULL;
+	}
+	amdgpu_bo_unreserve(ring->mqd_obj);
+	if (r) {
+		DRM_ERROR("fail to unresv mqd_obj\n");
+		return r;
+	}
 
 	return amdgpu_ring_test_ring(ring);
 }