drm/radeon/dpm: add debugfs support for TN

This allows you to look at the current DPM state via
debugfs.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2108,6 +2108,7 @@ static struct radeon_asic trinity_asic = {
 		.get_sclk = &trinity_dpm_get_sclk,
 		.get_mclk = &trinity_dpm_get_mclk,
 		.print_power_state = &trinity_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &trinity_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -626,6 +626,8 @@ u32 trinity_dpm_get_sclk(struct radeon_device *rdev, bool low);
 u32 trinity_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void trinity_dpm_print_power_state(struct radeon_device *rdev,
 				   struct radeon_ps *ps);
+void trinity_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+							 struct seq_file *m);
 
 /* DCE6 - SI */
 void dce6_bandwidth_update(struct radeon_device *rdev);

drivers/gpu/drm/radeon/trinity_dpm.c

@@ -1855,6 +1855,27 @@ void trinity_dpm_print_power_state(struct radeon_device *rdev,
 	r600_dpm_print_ps_status(rdev, rps);
 }
 
+void trinity_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+							 struct seq_file *m)
+{
+	struct radeon_ps *rps = rdev->pm.dpm.current_ps;
+	struct trinity_ps *ps = trinity_get_ps(rps);
+	struct trinity_pl *pl;
+	u32 current_index =
+		(RREG32(TARGET_AND_CURRENT_PROFILE_INDEX) & CURRENT_STATE_MASK) >>
+		CURRENT_STATE_SHIFT;
+
+	if (current_index >= ps->num_levels) {
+		seq_printf(m, "invalid dpm profile %d\n", current_index);
+	} else {
+		pl = &ps->levels[current_index];
+		seq_printf(m, "uvd    vclk: %d dclk: %d\n", rps->vclk, rps->dclk);
+		seq_printf(m, "power level %d    sclk: %u vddc: %u\n",
+			   current_index, pl->sclk,
+			   trinity_convert_voltage_index_to_value(rdev, pl->vddc_index));
+	}
+}
+
 void trinity_dpm_fini(struct radeon_device *rdev)
 {
 	int i;