From 45b0cf54bc5da284afc86fad97e1c8b1bbe26d73 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Sat, 19 Dec 2015 18:26:55 -0500
Subject: [PATCH] amd/powerplay: don't enable ucode fan control if vbios has no
 fan table

Some systems have a single fan controlled by ACPI or some other
method.

Reviewed-by: Tom St Denis <tom.stdenis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
index 5da758674a48..2e159b003e71 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/tonga_thermal.c
@@ -371,6 +371,9 @@ int tf_tonga_thermal_setup_fan_table(struct pp_hwmgr *hwmgr, void *input, void *
 	int res;
 	uint64_t tmp64;
 
+	if (!phm_cap_enabled(hwmgr->platform_descriptor.platformCaps, PHM_PlatformCaps_MicrocodeFanControl))
+		return 0;
+
 	if (0 == data->fan_table_start) {
 		phm_cap_unset(hwmgr->platform_descriptor.platformCaps, PHM_PlatformCaps_MicrocodeFanControl);
 		return 0;
-- 
2.20.1