drm/radeon/dpm: add dpm_set_power_state failure output (7xx-ni)

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/btc_dpm.c b/drivers/gpu/drm/radeon/btc_dpm.c
index 4a50b50..0cbf75e 100644
--- a/drivers/gpu/drm/radeon/btc_dpm.c
+++ b/drivers/gpu/drm/radeon/btc_dpm.c
@@ -2274,44 +2274,57 @@
 	ret = btc_disable_ulv(rdev);
 	btc_set_boot_state_timing(rdev);
 	ret = rv770_restrict_performance_levels_before_switch(rdev);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("rv770_restrict_performance_levels_before_switch failed\n");
 		return ret;
+	}
 	if (eg_pi->pcie_performance_request)
 		cypress_notify_link_speed_change_before_state_change(rdev, new_ps, old_ps);
 
 	rv770_set_uvd_clock_before_set_eng_clock(rdev, new_ps, old_ps);
 	ret = rv770_halt_smc(rdev);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("rv770_halt_smc failed\n");
 		return ret;
+	}
 	btc_set_at_for_uvd(rdev, new_ps);
 	if (eg_pi->smu_uvd_hs)
 		btc_notify_uvd_to_smc(rdev, new_ps);
 	ret = cypress_upload_sw_state(rdev, new_ps);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("cypress_upload_sw_state failed\n");
 		return ret;
-
+	}
 	if (eg_pi->dynamic_ac_timing) {
 		ret = cypress_upload_mc_reg_table(rdev, new_ps);
-		if (ret)
+		if (ret) {
+			DRM_ERROR("cypress_upload_mc_reg_table failed\n");
 			return ret;
+		}
 	}
 
 	cypress_program_memory_timing_parameters(rdev, new_ps);
 
 	ret = rv770_resume_smc(rdev);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("rv770_resume_smc failed\n");
 		return ret;
+	}
 	ret = rv770_set_sw_state(rdev);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("rv770_set_sw_state failed\n");
 		return ret;
+	}
 	rv770_set_uvd_clock_after_set_eng_clock(rdev, new_ps, old_ps);
 
 	if (eg_pi->pcie_performance_request)
 		cypress_notify_link_speed_change_after_state_change(rdev, new_ps, old_ps);
 
 	ret = btc_set_power_state_conditionally_enable_ulv(rdev, new_ps);
-	if (ret)
+	if (ret) {
+		DRM_ERROR("btc_set_power_state_conditionally_enable_ulv failed\n");
 		return ret;
+	}
 
 #if 0
 	/* XXX */