drm/radeon/dpm: add debugfs support for 7xx/evergreen/btc

This allows you to look at the current DPM state via
debugfs.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/rv770d.h b/drivers/gpu/drm/radeon/rv770d.h
index 784eeaf..6bef2b7 100644
--- a/drivers/gpu/drm/radeon/rv770d.h
+++ b/drivers/gpu/drm/radeon/rv770d.h
@@ -207,6 +207,10 @@
 #       define MUX_TCLK_TO_XCLK                           (1 << 8)
 #       define XTALIN_DIVIDE                              (1 << 9)
 
+#define TARGET_AND_CURRENT_PROFILE_INDEX                  0x66c
+#       define CURRENT_PROFILE_INDEX_MASK                 (0xf << 4)
+#       define CURRENT_PROFILE_INDEX_SHIFT                4
+
 #define S0_VID_LOWER_SMIO_CNTL                            0x678
 #define S1_VID_LOWER_SMIO_CNTL                            0x67c
 #define S2_VID_LOWER_SMIO_CNTL                            0x680