drm/amd/powerplay: update OD to take voltage value instead of offset

With the latest SMC fw, we are able to get the voltage value for
specific frequency point. So, we update the OD relates to take
absolute voltage instead of offset.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/inc/smu11_driver_if.h

@@ -569,11 +569,11 @@ typedef struct {
   uint16_t      GfxclkFmin;
   uint16_t      GfxclkFmax;
   uint16_t      GfxclkFreq1;
-  int16_t      GfxclkOffsetVolt1;
+  uint16_t      GfxclkVolt1;
   uint16_t      GfxclkFreq2;
-  int16_t      GfxclkOffsetVolt2;
+  uint16_t      GfxclkVolt2;
   uint16_t      GfxclkFreq3;
-  int16_t      GfxclkOffsetVolt3;
+  uint16_t      GfxclkVolt3;
   uint16_t      UclkFmax;
   int16_t       OverDrivePct;
   uint16_t      FanMaximumRpm;

drivers/gpu/drm/amd/powerplay/inc/vega20_ppsmc.h

@@ -117,7 +117,8 @@
 #define PPSMC_MSG_PrepareMp1ForReset             0x59
 #define PPSMC_MSG_PrepareMp1ForShutdown          0x5A
 #define PPSMC_MSG_SetMGpuFanBoostLimitRpm        0x5D
-#define PPSMC_Message_Count                      0x5E
+#define PPSMC_MSG_GetAVFSVoltageByDpm            0x5F
+#define PPSMC_Message_Count                      0x60
 
 typedef uint32_t PPSMC_Result;
 typedef uint32_t PPSMC_Msg;