drm/amdgpu: Remove duplicate code in gfx_v8_0.c

There are no any logical changes here.

1. if kcq can be enabled via kiq, we don't need to
   do kiq ring test.
2. amdgpu_ring_test_ring function can be used to
   sync the ring complete, remove the duplicate code.

v2: alloc 6 (not 7) dws for unmap_queues

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c

@@ -4604,7 +4604,6 @@ static void gfx_v8_0_kiq_setting(struct amdgpu_ring *ring)
 static int gfx_v8_0_kiq_kcq_enable(struct amdgpu_device *adev)
 {
 	struct amdgpu_ring *kiq_ring = &adev->gfx.kiq.ring;
-	uint32_t scratch, tmp = 0;
 	uint64_t queue_mask = 0;
 	int r, i;
 
@@ -4623,17 +4622,10 @@ static int gfx_v8_0_kiq_kcq_enable(struct amdgpu_device *adev)
 		queue_mask |= (1ull << i);
 	}
 
-	r = amdgpu_gfx_scratch_get(adev, &scratch);
-	if (r) {
-		DRM_ERROR("Failed to get scratch reg (%d).\n", r);
-		return r;
-	}
-	WREG32(scratch, 0xCAFEDEAD);
-
-	r = amdgpu_ring_alloc(kiq_ring, (8 * adev->gfx.num_compute_rings) + 11);
+	kiq_ring->ready = true;
+	r = amdgpu_ring_alloc(kiq_ring, (8 * adev->gfx.num_compute_rings) + 8);
 	if (r) {
 		DRM_ERROR("Failed to lock KIQ (%d).\n", r);
-		amdgpu_gfx_scratch_free(adev, scratch);
 		return r;
 	}
 	/* set resources */
@@ -4665,25 +4657,12 @@ static int gfx_v8_0_kiq_kcq_enable(struct amdgpu_device *adev)
 		amdgpu_ring_write(kiq_ring, lower_32_bits(wptr_addr));
 		amdgpu_ring_write(kiq_ring, upper_32_bits(wptr_addr));
 	}
-	/* write to scratch for completion */
-	amdgpu_ring_write(kiq_ring, PACKET3(PACKET3_SET_UCONFIG_REG, 1));
-	amdgpu_ring_write(kiq_ring, (scratch - PACKET3_SET_UCONFIG_REG_START));
-	amdgpu_ring_write(kiq_ring, 0xDEADBEEF);
-	amdgpu_ring_commit(kiq_ring);
 
-	for (i = 0; i < adev->usec_timeout; i++) {
-		tmp = RREG32(scratch);
-		if (tmp == 0xDEADBEEF)
-			break;
-		DRM_UDELAY(1);
-	}
-	if (i >= adev->usec_timeout) {
-		DRM_ERROR("KCQ enable failed (scratch(0x%04X)=0x%08X)\n",
-			  scratch, tmp);
-		r = -EINVAL;
+	r = amdgpu_ring_test_ring(kiq_ring);
+	if (r) {
+		DRM_ERROR("KCQ enable failed\n");
+		kiq_ring->ready = false;
 	}
-	amdgpu_gfx_scratch_free(adev, scratch);
-
 	return r;
 }
 
@@ -5014,15 +4993,6 @@ static int gfx_v8_0_kiq_resume(struct amdgpu_device *adev)
 	if (r)
 		goto done;
 
-	/* Test KIQ */
-	ring = &adev->gfx.kiq.ring;
-	ring->ready = true;
-	r = amdgpu_ring_test_ring(ring);
-	if (r) {
-		ring->ready = false;
-		goto done;
-	}
-
 	/* Test KCQs */
 	for (i = 0; i < adev->gfx.num_compute_rings; i++) {
 		ring = &adev->gfx.compute_ring[i];
@@ -5092,23 +5062,11 @@ static int gfx_v8_0_hw_init(void *handle)
 
 static int gfx_v8_0_kcq_disable(struct amdgpu_ring *kiq_ring,struct amdgpu_ring *ring)
 {
-	struct amdgpu_device *adev = kiq_ring->adev;
-	uint32_t scratch, tmp = 0;
-	int r, i;
-
-	r = amdgpu_gfx_scratch_get(adev, &scratch);
-	if (r) {
-		DRM_ERROR("Failed to get scratch reg (%d).\n", r);
-		return r;
-	}
-	WREG32(scratch, 0xCAFEDEAD);
+	int r;
 
-	r = amdgpu_ring_alloc(kiq_ring, 10);
-	if (r) {
+	r = amdgpu_ring_alloc(kiq_ring, 6);
+	if (r)
 		DRM_ERROR("Failed to lock KIQ (%d).\n", r);
-		amdgpu_gfx_scratch_free(adev, scratch);
-		return r;
-	}
 
 	/* unmap queues */
 	amdgpu_ring_write(kiq_ring, PACKET3(PACKET3_UNMAP_QUEUES, 4));
@@ -5121,23 +5079,11 @@ static int gfx_v8_0_kcq_disable(struct amdgpu_ring *kiq_ring,struct amdgpu_ring
 	amdgpu_ring_write(kiq_ring, 0);
 	amdgpu_ring_write(kiq_ring, 0);
 	amdgpu_ring_write(kiq_ring, 0);
-	/* write to scratch for completion */
-	amdgpu_ring_write(kiq_ring, PACKET3(PACKET3_SET_UCONFIG_REG, 1));
-	amdgpu_ring_write(kiq_ring, (scratch - PACKET3_SET_UCONFIG_REG_START));
-	amdgpu_ring_write(kiq_ring, 0xDEADBEEF);
-	amdgpu_ring_commit(kiq_ring);
 
-	for (i = 0; i < adev->usec_timeout; i++) {
-		tmp = RREG32(scratch);
-		if (tmp == 0xDEADBEEF)
-			break;
-		DRM_UDELAY(1);
-	}
-	if (i >= adev->usec_timeout) {
-		DRM_ERROR("KCQ disabled failed (scratch(0x%04X)=0x%08X)\n", scratch, tmp);
-		r = -EINVAL;
-	}
-	amdgpu_gfx_scratch_free(adev, scratch);
+	r = amdgpu_ring_test_ring(kiq_ring);
+	if (r)
+		DRM_ERROR("KCQ disable failed\n");
+
 	return r;
 }