drm/radeon/dpm: implement force performance level for CI

Allows you to force the selected performance level via sysfs.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/ppsmc.h b/drivers/gpu/drm/radeon/ppsmc.h
index 4c1ee6d..6828428 100644
--- a/drivers/gpu/drm/radeon/ppsmc.h
+++ b/drivers/gpu/drm/radeon/ppsmc.h
@@ -119,6 +119,7 @@
 #define PPSMC_MSG_SCLKDPM_SetEnabledMask      ((uint16_t) 0x145)
 #define PPSMC_MSG_MCLKDPM_SetEnabledMask      ((uint16_t) 0x146)
 #define PPSMC_MSG_PCIeDPM_ForceLevel          ((uint16_t) 0x147)
+#define PPSMC_MSG_PCIeDPM_UnForceLevel        ((uint16_t) 0x148)
 #define PPSMC_MSG_EnableVRHotGPIOInterrupt    ((uint16_t) 0x14a)
 #define PPSMC_MSG_DPM_Enable                  ((uint16_t) 0x14e)
 #define PPSMC_MSG_DPM_Disable                 ((uint16_t) 0x14f)