drm/radeon/dpm: add pre/post_set_power_state callback (TN)

This properly implemented dynamic state adjustment by
using a working copy of the requested and current
power states.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/trinity_dpm.h b/drivers/gpu/drm/radeon/trinity_dpm.h
index c663aed..c621b84 100644
--- a/drivers/gpu/drm/radeon/trinity_dpm.h
+++ b/drivers/gpu/drm/radeon/trinity_dpm.h
@@ -97,7 +97,6 @@
 	u32 thermal_auto_throttling;
 	struct trinity_sys_info sys_info;
 	struct trinity_pl boot_pl;
-	struct trinity_ps current_ps;
 	u32 min_sclk_did;
 	bool enable_nbps_policy;
 	bool voltage_drop_in_dce;
@@ -110,7 +109,10 @@
 	bool enable_dpm;
 	bool enable_sclk_ds;
 	bool uvd_dpm;
-	struct trinity_ps hw_ps;
+	struct radeon_ps current_rps;
+	struct trinity_ps current_ps;
+	struct radeon_ps requested_rps;
+	struct trinity_ps requested_ps;
 };
 
 #define TRINITY_AT_DFLT            30