drm/amdgpu/pm: handle fan properly when card is powered down

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>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index fda858ec3cad..18873c2286f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -991,6 +991,11 @@ static ssize_t amdgpu_hwmon_set_pwm1_enable(struct device *dev,
         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;
 
@@ -1025,6 +1030,11 @@ static ssize_t amdgpu_hwmon_set_pwm1(struct device *dev,
         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;
@@ -1048,6 +1058,11 @@ static ssize_t amdgpu_hwmon_get_pwm1(struct device *dev,
         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)
@@ -1067,6 +1082,11 @@ static ssize_t amdgpu_hwmon_get_fan1_input(struct device *dev,
         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)