drm/amd/display: Add tags for indicating mst progress status

[Why & How]
In order to leverage igt tool to maintain mst feature, expose new
debugfs entry "mst_progress_status".

In our dm flow, record down the result of each phase of mst and user
can examine the mst result by checking whether each phase get completed
successfully.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 45 insertions, 1 deletions

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 4eecf052d08d..aa4edf182095 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
@@ -50,6 +50,13 @@ struct dmub_debugfs_trace_entry {
 	uint32_t param1;
 };
 
+static const char *const mst_progress_status[] = {
+	"probe",
+	"remote_edid",
+	"allocate_new_payload",
+	"clear_allocated_payload",
+};
+
 /* parse_write_buffer_into_params - Helper function to parse debugfs write buffer into an array
  *
  * Function takes in attributes passed to debugfs write entry
@@ -2590,6 +2597,41 @@ static int dp_is_mst_connector_show(struct seq_file *m, void *unused)
 	return 0;
 }
 
+/*
+ * function description: Read out the mst progress status
+ *
+ * This function helps to determine the mst progress status of
+ * a mst connector.
+ *
+ * Access it with the following command:
+ *
+ *	cat /sys/kernel/debug/dri/0/DP-X/mst_progress_status
+ *
+ */
+static int dp_mst_progress_status_show(struct seq_file *m, void *unused)
+{
+	struct drm_connector *connector = m->private;
+	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_device *adev = drm_to_adev(connector->dev);
+	int i;
+
+	mutex_lock(&aconnector->hpd_lock);
+	mutex_lock(&adev->dm.dc_lock);
+
+	if (aconnector->mst_status == MST_STATUS_DEFAULT) {
+		seq_puts(m, "disabled\n");
+	} else {
+		for (i = 0; i < sizeof(mst_progress_status)/sizeof(char *); i++)
+			seq_printf(m, "%s:%s\n",
+				mst_progress_status[i],
+				aconnector->mst_status & BIT(i) ? "done" : "not_done");
+	}
+
+	mutex_unlock(&adev->dm.dc_lock);
+	mutex_unlock(&aconnector->hpd_lock);
+
+	return 0;
+}
 
 DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
 DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
@@ -2601,6 +2643,7 @@ DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
 DEFINE_SHOW_ATTRIBUTE(internal_display);
 DEFINE_SHOW_ATTRIBUTE(psr_capability);
 DEFINE_SHOW_ATTRIBUTE(dp_is_mst_connector);
+DEFINE_SHOW_ATTRIBUTE(dp_mst_progress_status);
 
 static const struct file_operations dp_dsc_clock_en_debugfs_fops = {
 	.owner = THIS_MODULE,
@@ -2744,7 +2787,8 @@ static const struct {
 		{"dp_dsc_fec_support", &dp_dsc_fec_support_fops},
 		{"max_bpc", &dp_max_bpc_debugfs_fops},
 		{"dsc_disable_passthrough", &dp_dsc_disable_passthrough_debugfs_fops},
-		{"is_mst_connector", &dp_is_mst_connector_fops}
+		{"is_mst_connector", &dp_is_mst_connector_fops},
+		{"mst_progress_status", &dp_mst_progress_status_fops}
 };
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP