drm/amd/powerplay/vega20: tell the correct gfx voltage V2

Export the correct gfx voltage by hwmon interface.

V2: update the register naming for consistency
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/asic_reg/smuio/smuio_9_0_offset.h

@@ -175,4 +175,7 @@
 #define mmSMUSVI0_PLANE0_CURRENTVID_BASE_IDX                                                           0
 #define mmSMUSVI0_PLANE0_CURRENTVID                                                                    0x0013
 
+#define mmSMUSVI0_TEL_PLANE0_BASE_IDX                                                                  0
+#define mmSMUSVI0_TEL_PLANE0                                                                           0x0004
+
 #endif

drivers/gpu/drm/amd/include/asic_reg/smuio/smuio_9_0_sh_mask.h

@@ -258,4 +258,7 @@
 #define SMUSVI0_PLANE0_CURRENTVID__CURRENT_SVI0_PLANE0_VID__SHIFT                                             0x18
 #define SMUSVI0_PLANE0_CURRENTVID__CURRENT_SVI0_PLANE0_VID_MASK                                               0xFF000000L
 
+#define SMUSVI0_TEL_PLANE0__SVI0_PLANE0_VDDCOR__SHIFT                                                         0x10
+#define SMUSVI0_TEL_PLANE0__SVI0_PLANE0_VDDCOR_MASK                                                           0x01FF0000L
+
 #endif

drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c

@@ -46,6 +46,9 @@
 #include "ppinterrupt.h"
 #include "pp_overdriver.h"
 #include "pp_thermal.h"
+#include "soc15_common.h"
+#include "smuio/smuio_9_0_offset.h"
+#include "smuio/smuio_9_0_sh_mask.h"
 
 static void vega20_set_default_registry_data(struct pp_hwmgr *hwmgr)
 {
@@ -1915,6 +1918,8 @@ static int vega20_read_sensor(struct pp_hwmgr *hwmgr, int idx,
 			      void *value, int *size)
 {
 	struct vega20_hwmgr *data = (struct vega20_hwmgr *)(hwmgr->backend);
+	struct amdgpu_device *adev = hwmgr->adev;
+	uint32_t val_vid;
 	int ret = 0;
 
 	switch (idx) {
@@ -1949,6 +1954,13 @@ static int vega20_read_sensor(struct pp_hwmgr *hwmgr, int idx,
 		*size = 16;
 		ret = vega20_get_gpu_power(hwmgr, (uint32_t *)value);
 		break;
+	case AMDGPU_PP_SENSOR_VDDGFX:
+		val_vid = (RREG32_SOC15(SMUIO, 0, mmSMUSVI0_TEL_PLANE0) &
+			SMUSVI0_TEL_PLANE0__SVI0_PLANE0_VDDCOR_MASK) >>
+			SMUSVI0_TEL_PLANE0__SVI0_PLANE0_VDDCOR__SHIFT;
+		*((uint32_t *)value) =
+			(uint32_t)convert_to_vddc((uint8_t)val_vid);
+		break;
 	case AMDGPU_PP_SENSOR_ENABLED_SMC_FEATURES_MASK:
 		ret = vega20_get_enabled_smc_features(hwmgr, (uint64_t *)value);
 		if (!ret)