drm/amdgpu: use begin/end_use for UVD power/clock gating

This fixes turning power and clock on when it is actually needed.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -92,7 +92,6 @@ MODULE_FIRMWARE(FIRMWARE_STONEY);
 MODULE_FIRMWARE(FIRMWARE_POLARIS10);
 MODULE_FIRMWARE(FIRMWARE_POLARIS11);
 
-static void amdgpu_uvd_note_usage(struct amdgpu_device *adev);
 static void amdgpu_uvd_idle_work_handler(struct work_struct *work);
 
 int amdgpu_uvd_sw_init(struct amdgpu_device *adev)
@@ -346,8 +345,6 @@ void amdgpu_uvd_free_handles(struct amdgpu_device *adev, struct drm_file *filp)
 		if (handle != 0 && adev->uvd.filp[i] == filp) {
 			struct fence *fence;
 
-			amdgpu_uvd_note_usage(adev);
-
 			r = amdgpu_uvd_get_destroy_msg(ring, handle,
 						       false, &fence);
 			if (r) {
@@ -913,8 +910,6 @@ int amdgpu_uvd_ring_parse_cs(struct amdgpu_cs_parser *parser, uint32_t ib_idx)
 		return -EINVAL;
 	}
 
-	amdgpu_uvd_note_usage(ctx.parser->adev);
-
 	return 0;
 }
 
@@ -1114,11 +1109,10 @@ static void amdgpu_uvd_idle_work_handler(struct work_struct *work)
 	}
 }
 
-static void amdgpu_uvd_note_usage(struct amdgpu_device *adev)
+void amdgpu_uvd_ring_begin_use(struct amdgpu_ring *ring)
 {
+	struct amdgpu_device *adev = ring->adev;
 	bool set_clocks = !cancel_delayed_work_sync(&adev->uvd.idle_work);
-	set_clocks &= schedule_delayed_work(&adev->uvd.idle_work,
-					    UVD_IDLE_TIMEOUT);
 
 	if (set_clocks) {
 		if (adev->pm.dpm_enabled) {
@@ -1128,3 +1122,8 @@ static void amdgpu_uvd_note_usage(struct amdgpu_device *adev)
 		}
 	}
 }
+
+void amdgpu_uvd_ring_end_use(struct amdgpu_ring *ring)
+{
+	schedule_delayed_work(&ring->adev->uvd.idle_work, UVD_IDLE_TIMEOUT);
+}

drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.h

@@ -35,5 +35,7 @@ int amdgpu_uvd_get_destroy_msg(struct amdgpu_ring *ring, uint32_t handle,
 void amdgpu_uvd_free_handles(struct amdgpu_device *adev,
 			     struct drm_file *filp);
 int amdgpu_uvd_ring_parse_cs(struct amdgpu_cs_parser *parser, uint32_t ib_idx);
+void amdgpu_uvd_ring_begin_use(struct amdgpu_ring *ring);
+void amdgpu_uvd_ring_end_use(struct amdgpu_ring *ring);
 
 #endif

drivers/gpu/drm/amd/amdgpu/uvd_v4_2.c

@@ -797,6 +797,8 @@ static const struct amdgpu_ring_funcs uvd_v4_2_ring_funcs = {
 	.test_ib = uvd_v4_2_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
 	.pad_ib = amdgpu_ring_generic_pad_ib,
+	.begin_use = amdgpu_uvd_ring_begin_use,
+	.end_use = amdgpu_uvd_ring_end_use,
 };
 
 static void uvd_v4_2_set_ring_funcs(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/uvd_v5_0.c

@@ -848,6 +848,8 @@ static const struct amdgpu_ring_funcs uvd_v5_0_ring_funcs = {
 	.test_ib = uvd_v5_0_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
 	.pad_ib = amdgpu_ring_generic_pad_ib,
+	.begin_use = amdgpu_uvd_ring_begin_use,
+	.end_use = amdgpu_uvd_ring_end_use,
 };
 
 static void uvd_v5_0_set_ring_funcs(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c

@@ -1019,6 +1019,8 @@ static const struct amdgpu_ring_funcs uvd_v6_0_ring_phys_funcs = {
 	.test_ib = uvd_v6_0_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
 	.pad_ib = amdgpu_ring_generic_pad_ib,
+	.begin_use = amdgpu_uvd_ring_begin_use,
+	.end_use = amdgpu_uvd_ring_end_use,
 };
 
 static const struct amdgpu_ring_funcs uvd_v6_0_ring_vm_funcs = {
@@ -1036,6 +1038,8 @@ static const struct amdgpu_ring_funcs uvd_v6_0_ring_vm_funcs = {
 	.test_ib = uvd_v6_0_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
 	.pad_ib = amdgpu_ring_generic_pad_ib,
+	.begin_use = amdgpu_uvd_ring_begin_use,
+	.end_use = amdgpu_uvd_ring_end_use,
 };
 
 static void uvd_v6_0_set_ring_funcs(struct amdgpu_device *adev)