[PATCH 2/2] drm/amdgpu: Example Usage in AMDGPU

[Fangzhi Zuo <Jerry.Zuo@xxxxxxx>]

1. Decide MST Link Encoding Cap
2. Update MST First Link Slot Information

Signed-off-by: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c      |  4 +++-
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c    | 10 ++++++++++
 .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h    |  2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 986c9d29d686..90edf0eae786 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2302,6 +2302,7 @@ static int dm_resume(void *handle)
 			dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
 		amdgpu_dm_update_connector_after_detect(aconnector);
+		get_mst_link_encoding_cap(aconnector);
 		mutex_unlock(&aconnector->hpd_lock);
 	}
 	drm_connector_list_iter_end(&iter);
@@ -2673,6 +2674,7 @@ static void handle_hpd_irq(void *param)
 		if (aconnector->base.force == DRM_FORCE_UNSPECIFIED)
 			drm_kms_helper_hotplug_event(dev);
 	}
+	get_mst_link_encoding_cap(aconnector);
 	mutex_unlock(&aconnector->hpd_lock);
 
 }
@@ -3844,7 +3846,7 @@ static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev)
 				amdgpu_dm_set_psr_caps(link);
 		}
 
-
+		get_mst_link_encoding_cap(aconnector);
 	}
 
 	/* Software is initialized. Now we can register interrupt handlers. */
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 5568d4e518e6..2f029cbdd3f8 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -439,6 +439,16 @@ static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
 	.add_connector = dm_dp_add_mst_connector,
 };
 
+void get_mst_link_encoding_cap(struct amdgpu_dm_connector *aconnector)
+{
+	u8 link_encoding_cap;
+
+	if (aconnector->dc_link->type == dc_connection_mst_branch) {
+		link_encoding_cap = dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);
+		drm_dp_mst_update_coding_cap(&aconnector->mst_mgr, link_encoding_cap);
+	}
+}
+
 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector,
 				       int link_index)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
index b38bd68121ce..8339053b2b70 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
@@ -35,6 +35,8 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector,
 				       int link_index);
 
+void get_mst_link_encoding_cap(struct amdgpu_dm_connector *aconnector);
+
 void
 dm_dp_create_fake_mst_encoders(struct amdgpu_device *adev);
 
-- 
2.25.1