drm/amdgpu/powerplay: implement thermal sensor for CZ/ST

Add missing functionality.
Reviewed-by: Tom St Denis <tom.stdenis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1785,6 +1785,21 @@ static int cz_get_max_high_clocks(struct pp_hwmgr *hwmgr, struct amd_pp_simple_c
 	return 0;
 }
 
+static int cz_thermal_get_temperature(struct pp_hwmgr *hwmgr)
+{
+	int actual_temp = 0;
+	uint32_t val = cgs_read_ind_register(hwmgr->device,
+					     CGS_IND_REG__SMC, ixTHM_TCON_CUR_TMP);
+	uint32_t temp = PHM_GET_FIELD(val, THM_TCON_CUR_TMP, CUR_TEMP);
+
+	if (PHM_GET_FIELD(val, THM_TCON_CUR_TMP, CUR_TEMP_RANGE_SEL))
+		actual_temp = ((temp / 8) - 49) * PP_TEMPERATURE_UNITS_PER_CENTIGRADES;
+	else
+		actual_temp = (temp / 8) * PP_TEMPERATURE_UNITS_PER_CENTIGRADES;
+
+	return actual_temp;
+}
+
 static int cz_read_sensor(struct pp_hwmgr *hwmgr, int idx, int32_t *value)
 {
 	struct cz_hwmgr *cz_hwmgr = (struct cz_hwmgr *)(hwmgr->backend);
@@ -1881,6 +1896,9 @@ static int cz_read_sensor(struct pp_hwmgr *hwmgr, int idx, int32_t *value)
 	case AMDGPU_PP_SENSOR_VCE_POWER:
 		*value = cz_hwmgr->vce_power_gated ? 0 : 1;
 		return 0;
+	case AMDGPU_PP_SENSOR_GPU_TEMP:
+		*value = cz_thermal_get_temperature(hwmgr);
+		return 0;
 	default:
 		return -EINVAL;
 	}