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>

4 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 842e1d300745..c2372902f722 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/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,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index eb66cc526950..85b36edbdd61 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/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)
 {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 0345fbbfff4e..c63e5d3a902c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/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");
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index 92138a9f6f93..5fffe6f72640 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/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__ */