drm/amd/pm: Add board voltage node to hwmon

Add and expose board voltage node as vddboard to hwmon for smu_v13_0_6

v2: Replace ip check with supported sensor attribute(Lijo)

Signed-off-by: Asad Kamal <asad.kamal@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/kgd_pp_interface.h

@@ -128,6 +128,7 @@ enum amd_pp_sensors {
 	AMDGPU_PP_SENSOR_CPU_CLK,
 	AMDGPU_PP_SENSOR_VDDNB,
 	AMDGPU_PP_SENSOR_VDDGFX,
+	AMDGPU_PP_SENSOR_VDDBOARD,
 	AMDGPU_PP_SENSOR_UVD_VCLK,
 	AMDGPU_PP_SENSOR_UVD_DCLK,
 	AMDGPU_PP_SENSOR_VCE_ECCLK,

drivers/gpu/drm/amd/pm/amdgpu_pm.c

@@ -2944,13 +2944,36 @@ static ssize_t amdgpu_hwmon_show_vddgfx(struct device *dev,
 	return sysfs_emit(buf, "%d\n", vddgfx);
 }
 
+static ssize_t amdgpu_hwmon_show_vddboard(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct amdgpu_device *adev = dev_get_drvdata(dev);
+	u32 vddboard;
+	int r;
+
+	/* get the voltage */
+	r = amdgpu_hwmon_get_sensor_generic(adev, AMDGPU_PP_SENSOR_VDDBOARD,
+					    (void *)&vddboard);
+	if (r)
+		return r;
+
+	return sysfs_emit(buf, "%d\n", vddboard);
+}
+
 static ssize_t amdgpu_hwmon_show_vddgfx_label(struct device *dev,
 					      struct device_attribute *attr,
 					      char *buf)
 {
 	return sysfs_emit(buf, "vddgfx\n");
 }
 
+static ssize_t amdgpu_hwmon_show_vddboard_label(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	return sysfs_emit(buf, "vddboard\n");
+}
 static ssize_t amdgpu_hwmon_show_vddnb(struct device *dev,
 				       struct device_attribute *attr,
 				       char *buf)
@@ -3294,6 +3317,8 @@ static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, amdgpu_hwmon_show_vddgfx, NULL, 0)
 static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, amdgpu_hwmon_show_vddgfx_label, NULL, 0);
 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, amdgpu_hwmon_show_vddnb, NULL, 0);
 static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, amdgpu_hwmon_show_vddnb_label, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, amdgpu_hwmon_show_vddboard, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, amdgpu_hwmon_show_vddboard_label, NULL, 0);
 static SENSOR_DEVICE_ATTR(power1_average, S_IRUGO, amdgpu_hwmon_show_power_avg, NULL, 0);
 static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, amdgpu_hwmon_show_power_input, NULL, 0);
 static SENSOR_DEVICE_ATTR(power1_cap_max, S_IRUGO, amdgpu_hwmon_show_power_cap_max, NULL, 0);
@@ -3341,6 +3366,8 @@ static struct attribute *hwmon_attributes[] = {
 	&sensor_dev_attr_in0_label.dev_attr.attr,
 	&sensor_dev_attr_in1_input.dev_attr.attr,
 	&sensor_dev_attr_in1_label.dev_attr.attr,
+	&sensor_dev_attr_in2_input.dev_attr.attr,
+	&sensor_dev_attr_in2_label.dev_attr.attr,
 	&sensor_dev_attr_power1_average.dev_attr.attr,
 	&sensor_dev_attr_power1_input.dev_attr.attr,
 	&sensor_dev_attr_power1_cap_max.dev_attr.attr,
@@ -3492,6 +3519,13 @@ static umode_t hwmon_attributes_visible(struct kobject *kobj,
 	     attr == &sensor_dev_attr_in1_label.dev_attr.attr))
 		return 0;
 
+	/* only few boards support vddboard */
+	if ((attr == &sensor_dev_attr_in2_input.dev_attr.attr ||
+	     attr == &sensor_dev_attr_in2_label.dev_attr.attr) &&
+	     amdgpu_hwmon_get_sensor_generic(adev, AMDGPU_PP_SENSOR_VDDBOARD,
+					     (void *)&tmp) == -EOPNOTSUPP)
+		return 0;
+
 	/* no mclk on APUs other than gc 9,4,3*/
 	if (((adev->flags & AMD_IS_APU) && (gc_ver != IP_VERSION(9, 4, 3))) &&
 	    (attr == &sensor_dev_attr_freq2_input.dev_attr.attr ||

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c

@@ -1652,6 +1652,7 @@ static int smu_v13_0_6_read_sensor(struct smu_context *smu,
 				   enum amd_pp_sensors sensor, void *data,
 				   uint32_t *size)
 {
+	struct smu_13_0_dpm_context *dpm_context = smu->smu_dpm.dpm_context;
 	int ret = 0;
 
 	if (amdgpu_ras_intr_triggered())
@@ -1696,6 +1697,15 @@ static int smu_v13_0_6_read_sensor(struct smu_context *smu,
 		ret = smu_v13_0_get_gfx_vdd(smu, (uint32_t *)data);
 		*size = 4;
 		break;
+	case AMDGPU_PP_SENSOR_VDDBOARD:
+		if (smu_v13_0_6_cap_supported(smu, SMU_CAP(BOARD_VOLTAGE))) {
+			*(uint32_t *)data = dpm_context->board_volt;
+			*size = 4;
+			break;
+		} else {
+			ret = -EOPNOTSUPP;
+			break;
+		}
 	case AMDGPU_PP_SENSOR_GPU_AVG_POWER:
 	default:
 		ret = -EOPNOTSUPP;