drm/amdgpu/pm: add some checks for PX

I.e., doesn't make sense to change power states or check the
temperature when the asic is powered off.

Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 5ed5598997e9ae0a507d83f1ebfef3df7117e8da..8de765dee3e7a426baf5765143ba1dcd9681eff0 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -113,6 +113,10 @@ static ssize_t amdgpu_get_dpm_forced_performance_level(struct device *dev,
        struct drm_device *ddev = dev_get_drvdata(dev);
        struct amdgpu_device *adev = ddev->dev_private;
 
+       if  ((adev->flags & AMD_IS_PX) &&
+            (ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+               return snprintf(buf, PAGE_SIZE, "off\n");
+
        if (adev->pp_enabled) {
                enum amd_dpm_forced_level level;
 
@@ -140,6 +144,11 @@ static ssize_t amdgpu_set_dpm_forced_performance_level(struct device *dev,
        enum amdgpu_dpm_forced_level level;
        int ret = 0;
 
+       /* Can't force performance level when the card is off */
+       if  ((adev->flags & AMD_IS_PX) &&
+            (ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+               return -EINVAL;
+
        if (strncmp("low", buf, strlen("low")) == 0) {
                level = AMDGPU_DPM_FORCED_LEVEL_LOW;
        } else if (strncmp("high", buf, strlen("high")) == 0) {
@@ -181,8 +190,14 @@ static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
                                      char *buf)
 {
        struct amdgpu_device *adev = dev_get_drvdata(dev);
+       struct drm_device *ddev = adev->ddev;
        int temp;
 
+       /* Can't get temperature when the card is off */
+       if  ((adev->flags & AMD_IS_PX) &&
+            (ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+               return -EINVAL;
+
        if (!adev->pp_enabled && !adev->pm.funcs->get_temperature)
                temp = 0;
        else
@@ -846,12 +861,16 @@ static int amdgpu_debugfs_pm_info(struct seq_file *m, void *data)
        struct drm_info_node *node = (struct drm_info_node *) m->private;
        struct drm_device *dev = node->minor->dev;
        struct amdgpu_device *adev = dev->dev_private;
+       struct drm_device *ddev = adev->ddev;
 
        if (!adev->pm.dpm_enabled) {
                seq_printf(m, "dpm not enabled\n");
                return 0;
        }
-       if (adev->pp_enabled) {
+       if  ((adev->flags & AMD_IS_PX) &&
+            (ddev->switch_power_state != DRM_SWITCH_POWER_ON)) {
+               seq_printf(m, "PX asic powered off\n");
+       } else if (adev->pp_enabled) {
                amdgpu_dpm_debugfs_print_current_performance_level(adev, m);
        } else {
                mutex_lock(&adev->pm.mutex);