From: Alex Deucher <alexander.deucher@amd.com>
Date: Wed, 24 Jan 2018 16:41:50 -0500
Subject: drm/amdgpu/pm: handle fan properly when card is powered down
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Git-commit: 5ec36e2d7030c17bd00c9766f9b97b421eae8cdf
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Return an error if the user tried to check or set the fan
parameters while the card is powered down (e.g., on a PX/HG
system for example).  This makes the fan consistent with the
temperature stuff.

Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -989,6 +989,11 @@ static ssize_t amdgpu_hwmon_set_pwm1_ena
 	int err;
 	int value;
 
+	/* Can't adjust fan when the card is off */
+	if  ((adev->flags & AMD_IS_PX) &&
+	     (adev->ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+		return -EINVAL;
+
 	if (!adev->powerplay.pp_funcs->set_fan_control_mode)
 		return -EINVAL;
 
@@ -1023,6 +1028,11 @@ static ssize_t amdgpu_hwmon_set_pwm1(str
 	int err;
 	u32 value;
 
+	/* Can't adjust fan when the card is off */
+	if  ((adev->flags & AMD_IS_PX) &&
+	     (adev->ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+		return -EINVAL;
+
 	err = kstrtou32(buf, 10, &value);
 	if (err)
 		return err;
@@ -1046,6 +1056,11 @@ static ssize_t amdgpu_hwmon_get_pwm1(str
 	int err;
 	u32 speed = 0;
 
+	/* Can't adjust fan when the card is off */
+	if  ((adev->flags & AMD_IS_PX) &&
+	     (adev->ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+		return -EINVAL;
+
 	if (adev->powerplay.pp_funcs->get_fan_speed_percent) {
 		err = amdgpu_dpm_get_fan_speed_percent(adev, &speed);
 		if (err)
@@ -1065,6 +1080,11 @@ static ssize_t amdgpu_hwmon_get_fan1_inp
 	int err;
 	u32 speed = 0;
 
+	/* Can't adjust fan when the card is off */
+	if  ((adev->flags & AMD_IS_PX) &&
+	     (adev->ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+		return -EINVAL;
+
 	if (adev->powerplay.pp_funcs->get_fan_speed_rpm) {
 		err = amdgpu_dpm_get_fan_speed_rpm(adev, &speed);
 		if (err)