drm/amdgpu: introduce an interface to get clock gating status dynamically

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -194,6 +194,7 @@ int amdgpu_set_clockgating_state(struct amdgpu_device *adev,
 int amdgpu_set_powergating_state(struct amdgpu_device *adev,
 				  enum amd_ip_block_type block_type,
 				  enum amd_powergating_state state);
+void amdgpu_get_clockgating_state(struct amdgpu_device *adev, u32 *flags);
 int amdgpu_wait_for_idle(struct amdgpu_device *adev,
 			 enum amd_ip_block_type block_type);
 bool amdgpu_is_idle(struct amdgpu_device *adev,

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

@@ -1131,6 +1131,18 @@ int amdgpu_set_powergating_state(struct amdgpu_device *adev,
 	return r;
 }
 
+void amdgpu_get_clockgating_state(struct amdgpu_device *adev, u32 *flags)
+{
+	int i;
+
+	for (i = 0; i < adev->num_ip_blocks; i++) {
+		if (!adev->ip_blocks[i].status.valid)
+			continue;
+		if (adev->ip_blocks[i].version->funcs->get_clockgating_state)
+			adev->ip_blocks[i].version->funcs->get_clockgating_state((void *)adev, flags);
+	}
+}
+
 int amdgpu_wait_for_idle(struct amdgpu_device *adev,
 			 enum amd_ip_block_type block_type)
 {

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

@@ -1365,6 +1365,10 @@ static int amdgpu_debugfs_pm_info(struct seq_file *m, void *data)
 	struct drm_device *dev = node->minor->dev;
 	struct amdgpu_device *adev = dev->dev_private;
 	struct drm_device *ddev = adev->ddev;
+	u32 flags = 0;
+
+	amdgpu_get_clockgating_state(adev, &flags);
+	seq_printf(m, "Clock Gating Flags Mask: 0x%x\n", flags);
 
 	if (!adev->pm.dpm_enabled) {
 		seq_printf(m, "dpm not enabled\n");

drivers/gpu/drm/amd/include/amd_shared.h

@@ -214,6 +214,8 @@ struct amd_ip_funcs {
 	/* enable/disable pg for the IP block */
 	int (*set_powergating_state)(void *handle,
 				     enum amd_powergating_state state);
+	/* get current clockgating status */
+	void (*get_clockgating_state)(void *handle, u32 *flags);
 };
 
 #endif /* __AMD_SHARED_H__ */