drm/amd/pm: add fan minimum pwm OD setting support for SMU13

Add SMU13 fan minimum pwm OD setting support.

Signed-off-by: Evan Quan <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

Documentation/gpu/amdgpu/thermal.rst

···
 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
    :doc: fan_target_temperature
 
+fan_minimum_pwm
+---------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: fan_minimum_pwm
+
 GFXOFF
 ======
 

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

···
 	OD_ACOUSTIC_LIMIT,
 	OD_ACOUSTIC_TARGET,
 	OD_FAN_TARGET_TEMPERATURE,
+	OD_FAN_MINIMUM_PWM,
 };
 
 enum amd_pp_sensors {
···
 	PP_OD_EDIT_ACOUSTIC_LIMIT,
 	PP_OD_EDIT_ACOUSTIC_TARGET,
 	PP_OD_EDIT_FAN_TARGET_TEMPERATURE,
+	PP_OD_EDIT_FAN_MINIMUM_PWM,
 };
 
 struct pp_states_info {

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

···
 	return umode;
 }
 
+/**
+ * DOC: fan_minimum_pwm
+ *
+ * The amdgpu driver provides a sysfs API for checking and adjusting the
+ * minimum fan speed in PWM.
+ *
+ * Reading back the file shows you the current setting and the permitted
+ * ranges if changable.
+ *
+ * Writing an integer to the file, change the setting accordingly.
+ *
+ * When you have finished the editing, write "c" (commit) to the file to commit
+ * your changes.
+ *
+ * This setting works under auto fan control mode only. It can co-exist with
+ * other settings which can work also under auto mode. It adjusts the PMFW's
+ * behavior about the minimum fan speed in PWM the fan should spin. Setting
+ * via this interface will switch the fan control to auto mode implicitly.
+ */
+static ssize_t fan_minimum_pwm_show(struct kobject *kobj,
+				    struct kobj_attribute *attr,
+				    char *buf)
+{
+	struct od_kobj *container = container_of(kobj, struct od_kobj, kobj);
+	struct amdgpu_device *adev = (struct amdgpu_device *)container->priv;
+
+	return (ssize_t)amdgpu_retrieve_od_settings(adev, OD_FAN_MINIMUM_PWM, buf);
+}
+
+static ssize_t fan_minimum_pwm_store(struct kobject *kobj,
+				     struct kobj_attribute *attr,
+				     const char *buf,
+				     size_t count)
+{
+	struct od_kobj *container = container_of(kobj, struct od_kobj, kobj);
+	struct amdgpu_device *adev = (struct amdgpu_device *)container->priv;
+
+	return (ssize_t)amdgpu_distribute_custom_od_settings(adev,
+							     PP_OD_EDIT_FAN_MINIMUM_PWM,
+							     buf,
+							     count);
+}
+
+static umode_t fan_minimum_pwm_visible(struct amdgpu_device *adev)
+{
+	umode_t umode = 0000;
+
+	if (adev->pm.od_feature_mask & OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE)
+		umode |= S_IRUSR | S_IRGRP | S_IROTH;
+
+	if (adev->pm.od_feature_mask & OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET)
+		umode |= S_IWUSR;
+
+	return umode;
+}
+
 static struct od_feature_set amdgpu_od_set = {
 	.containers = {
 		[0] = {
···
 						.is_visible = fan_target_temperature_visible,
 						.show = fan_target_temperature_show,
 						.store = fan_target_temperature_store,
+					},
+				},
+				[4] = {
+					.name = "fan_minimum_pwm",
+					.ops = {
+						.is_visible = fan_minimum_pwm_visible,
+						.show = fan_minimum_pwm_show,
+						.store = fan_minimum_pwm_store,
 					},
 				},
 			},

drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h

···
 #define OD_OPS_SUPPORT_ACOUSTIC_TARGET_THRESHOLD_SET		BIT(5)
 #define OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_RETRIEVE		BIT(6)
 #define OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET		BIT(7)
+#define OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE		BIT(8)
+#define OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET		BIT(9)
 
 struct amdgpu_pm {
 	struct mutex		mutex;

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

···
 		clk_type = SMU_OD_ACOUSTIC_TARGET; break;
 	case OD_FAN_TARGET_TEMPERATURE:
 		clk_type = SMU_OD_FAN_TARGET_TEMPERATURE; break;
+	case OD_FAN_MINIMUM_PWM:
+		clk_type = SMU_OD_FAN_MINIMUM_PWM; break;
 	default:
 		clk_type = SMU_CLK_COUNT; break;
 	}

drivers/gpu/drm/amd/pm/swsmu/inc/smu_types.h

···
 	SMU_OD_ACOUSTIC_LIMIT,
 	SMU_OD_ACOUSTIC_TARGET,
 	SMU_OD_FAN_TARGET_TEMPERATURE,
+	SMU_OD_FAN_MINIMUM_PWM,
 	SMU_CLK_COUNT,
 };
 

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c

···
 #define PP_OD_FEATURE_FAN_ACOUSTIC_LIMIT		7
 #define PP_OD_FEATURE_FAN_ACOUSTIC_TARGET		8
 #define PP_OD_FEATURE_FAN_TARGET_TEMPERATURE		9
+#define PP_OD_FEATURE_FAN_MINIMUM_PWM			10
 
 #define LINK_SPEED_MAX					3
 
···
 		od_min_setting = overdrive_lowerlimits->FanTargetTemperature;
 		od_max_setting = overdrive_upperlimits->FanTargetTemperature;
 		break;
+	case PP_OD_FEATURE_FAN_MINIMUM_PWM:
+		od_min_setting = overdrive_lowerlimits->FanMinimumPwm;
+		od_max_setting = overdrive_upperlimits->FanMinimumPwm;
+		break;
 	default:
 		od_min_setting = od_max_setting = INT_MAX;
 		break;
···
 						  &min_value,
 						  &max_value);
 		size += sysfs_emit_at(buf, size, "TARGET_TEMPERATURE: %u %u\n",
+				      min_value, max_value);
+		break;
+
+	case SMU_OD_FAN_MINIMUM_PWM:
+		if (!smu_v13_0_0_is_od_feature_supported(smu,
+							 PP_OD_FEATURE_FAN_CURVE_BIT))
+			break;
+
+		size += sysfs_emit_at(buf, size, "FAN_MINIMUM_PWM:\n");
+		size += sysfs_emit_at(buf, size, "%d\n",
+					(int)od_table->OverDriveTable.FanMinimumPwm);
+
+		size += sysfs_emit_at(buf, size, "%s:\n", "OD_RANGE");
+		smu_v13_0_0_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_MINIMUM_PWM,
+						  &min_value,
+						  &max_value);
+		size += sysfs_emit_at(buf, size, "MINIMUM_PWM: %u %u\n",
 				      min_value, max_value);
 		break;
 
···
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
 
+	case PP_OD_EDIT_FAN_MINIMUM_PWM:
+		if (!smu_v13_0_0_is_od_feature_supported(smu, PP_OD_FEATURE_FAN_CURVE_BIT)) {
+			dev_warn(adev->dev, "Fan curve setting not supported!\n");
+			return -ENOTSUPP;
+		}
+
+		smu_v13_0_0_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_MINIMUM_PWM,
+						  &minimum,
+						  &maximum);
+		if (input[0] < minimum ||
+		    input[0] > maximum) {
+			dev_info(adev->dev, "fan minimum pwm setting(%ld) must be within [%d, %d]!\n",
+				 input[0], minimum, maximum);
+			return -EINVAL;
+		}
+
+		od_table->OverDriveTable.FanMinimumPwm = input[0];
+		od_table->OverDriveTable.FanMode = FAN_MODE_AUTO;
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
+		break;
+
 	case PP_OD_RESTORE_DEFAULT_TABLE:
 		feature_ctrlmask = od_table->OverDriveTable.FeatureCtrlMask;
 		memcpy(od_table,
···
 					    OD_OPS_SUPPORT_ACOUSTIC_TARGET_THRESHOLD_RETRIEVE |
 					    OD_OPS_SUPPORT_ACOUSTIC_TARGET_THRESHOLD_SET |
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_RETRIEVE |
-					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET;
+					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET |
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE |
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET;
 }
 
 static int smu_v13_0_0_set_default_od_settings(struct smu_context *smu)
···
 			user_od_table_bak.OverDriveTable.AcousticTargetRpmThreshold;
 		user_od_table->OverDriveTable.FanTargetTemperature =
 			user_od_table_bak.OverDriveTable.FanTargetTemperature;
+		user_od_table->OverDriveTable.FanMinimumPwm =
+			user_od_table_bak.OverDriveTable.FanMinimumPwm;
 	}
 
 	smu_v13_0_0_set_supported_od_feature_mask(smu);

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c

···
 #define PP_OD_FEATURE_FAN_ACOUSTIC_LIMIT		7
 #define PP_OD_FEATURE_FAN_ACOUSTIC_TARGET		8
 #define PP_OD_FEATURE_FAN_TARGET_TEMPERATURE		9
+#define PP_OD_FEATURE_FAN_MINIMUM_PWM			10
 
 #define LINK_SPEED_MAX					3
 
···
 		od_min_setting = overdrive_lowerlimits->FanTargetTemperature;
 		od_max_setting = overdrive_upperlimits->FanTargetTemperature;
 		break;
+	case PP_OD_FEATURE_FAN_MINIMUM_PWM:
+		od_min_setting = overdrive_lowerlimits->FanMinimumPwm;
+		od_max_setting = overdrive_upperlimits->FanMinimumPwm;
+		break;
 	default:
 		od_min_setting = od_max_setting = INT_MAX;
 		break;
···
 						  &min_value,
 						  &max_value);
 		size += sysfs_emit_at(buf, size, "TARGET_TEMPERATURE: %u %u\n",
+				      min_value, max_value);
+		break;
+
+	case SMU_OD_FAN_MINIMUM_PWM:
+		if (!smu_v13_0_7_is_od_feature_supported(smu,
+							 PP_OD_FEATURE_FAN_CURVE_BIT))
+			break;
+
+		size += sysfs_emit_at(buf, size, "FAN_MINIMUM_PWM:\n");
+		size += sysfs_emit_at(buf, size, "%d\n",
+					(int)od_table->OverDriveTable.FanMinimumPwm);
+
+		size += sysfs_emit_at(buf, size, "%s:\n", "OD_RANGE");
+		smu_v13_0_7_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_MINIMUM_PWM,
+						  &min_value,
+						  &max_value);
+		size += sysfs_emit_at(buf, size, "MINIMUM_PWM: %u %u\n",
 				      min_value, max_value);
 		break;
 
···
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
 
+	case PP_OD_EDIT_FAN_MINIMUM_PWM:
+		if (!smu_v13_0_7_is_od_feature_supported(smu, PP_OD_FEATURE_FAN_CURVE_BIT)) {
+			dev_warn(adev->dev, "Fan curve setting not supported!\n");
+			return -ENOTSUPP;
+		}
+
+		smu_v13_0_7_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_MINIMUM_PWM,
+						  &minimum,
+						  &maximum);
+		if (input[0] < minimum ||
+		    input[0] > maximum) {
+			dev_info(adev->dev, "fan minimum pwm setting(%ld) must be within [%d, %d]!\n",
+				 input[0], minimum, maximum);
+			return -EINVAL;
+		}
+
+		od_table->OverDriveTable.FanMinimumPwm = input[0];
+		od_table->OverDriveTable.FanMode = FAN_MODE_AUTO;
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
+		break;
+
 	case PP_OD_RESTORE_DEFAULT_TABLE:
 		feature_ctrlmask = od_table->OverDriveTable.FeatureCtrlMask;
 		memcpy(od_table,
···
 					    OD_OPS_SUPPORT_ACOUSTIC_TARGET_THRESHOLD_RETRIEVE |
 					    OD_OPS_SUPPORT_ACOUSTIC_TARGET_THRESHOLD_SET |
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_RETRIEVE |
-					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET;
+					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET |
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE |
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET;
 }
 
 static int smu_v13_0_7_set_default_od_settings(struct smu_context *smu)
···
 			user_od_table_bak.OverDriveTable.AcousticTargetRpmThreshold;
 		user_od_table->OverDriveTable.FanTargetTemperature =
 			user_od_table_bak.OverDriveTable.FanTargetTemperature;
+		user_od_table->OverDriveTable.FanMinimumPwm =
+			user_od_table_bak.OverDriveTable.FanMinimumPwm;
 	}
 
 	smu_v13_0_7_set_supported_od_feature_mask(smu);