It is to force SST sequence in MST capable receiver.
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@xxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 31c05eb5c64a..1779c7daaf72 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -3237,6 +3237,30 @@ static int disable_hpd_get(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(disable_hpd_ops, disable_hpd_get,
disable_hpd_set, "%llu\n");
+/*
+ * Force sst sequence in mst capable receiver.
+ * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dp_set_mst_en_for_sst
+ */
+static int dp_force_sst_set(void *data, u64 val)
+{
+ struct amdgpu_device *adev = data;
+
+ adev->dm.dc->debug.set_mst_en_for_sst = val;
+
+ return 0;
+}
+
+static int dp_force_sst_get(void *data, u64 *val)
+{
+ struct amdgpu_device *adev = data;
+
+ *val = adev->dm.dc->debug.set_mst_en_for_sst;
+
+ return 0;
+}
+DEFINE_DEBUGFS_ATTRIBUTE(dp_set_mst_en_for_sst_ops, dp_force_sst_get,
+ dp_force_sst_set, "%llu\n");
+
/*
* Sets the DC visual confirm debug option from the given string.
* Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm
@@ -3346,6 +3370,8 @@ void dtn_debugfs_init(struct amdgpu_device *adev)
adev, &mst_topo_fops);
debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev,
&dtn_log_fops);
+ debugfs_create_file("amdgpu_dm_dp_set_mst_en_for_sst", 0644, root, adev,
+ &dp_set_mst_en_for_sst_ops);
debugfs_create_file_unsafe("amdgpu_dm_visual_confirm", 0644, root, adev,
&visual_confirm_fops);
--
2.25.1
