From: Evan Quan <evan.quan@amd.com>
Date: Wed, 1 Nov 2017 16:52:08 +0800
Subject: drm/amd/powerplay: wrong control mode cause the fan spins faster
 unnecessarily
Git-commit: 710931c2be5a784c0651111f54bd083e3681c309
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The fan control mode can either be FDO_PWM_MODE_STATIC or FDO_PWM_MODE_STATIC_RPM.
Setting it as AMD_FAN_CTRL_AUTO will cause the fan spin faster wrongly.

This can be reproduced by:
'# cat /sys/class/hwmon/hwmon0/pwm1
   38
'# cat /sys/class/hwmon/hwmon0/pwm1_enable
   2
'# echo "2" > /sys/class/hwmon/hwmon0/pwm1_enable
'# cat /sys/class/hwmon/hwmon0/pwm1
   122
The fan speed get faster wrongly even with its original mode echo back.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
@@ -4234,7 +4234,7 @@ static void vega10_set_fan_control_mode(
 			vega10_fan_ctrl_stop_smc_fan_control(hwmgr);
 		break;
 	case AMD_FAN_CTRL_AUTO:
-		if (!vega10_fan_ctrl_set_static_mode(hwmgr, mode))
+		if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl))
 			vega10_fan_ctrl_start_smc_fan_control(hwmgr);
 		break;
 	default: