drm/amd/pm: add zero RPM OD setting support for SMU13

Whilst we have support for setting fan curves there is no support for
disabling the zero RPM feature. Since the relevant bits are already
present in the OverDriveTable, hook them up to a sysctl setting so users
can influence this behaviour.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3489
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Wolfgang Müller <wolf@oriole.systems>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Documentation/gpu/amdgpu/thermal.rst

@@ -100,6 +100,12 @@ fan_minimum_pwm
 .. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
    :doc: fan_minimum_pwm
 
+fan_zero_rpm_enable
+----------------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/pm/amdgpu_pm.c
+   :doc: fan_zero_rpm_enable
+
 GFXOFF
 ======
 

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

@@ -119,6 +119,7 @@ enum pp_clock_type {
 	OD_ACOUSTIC_TARGET,
 	OD_FAN_TARGET_TEMPERATURE,
 	OD_FAN_MINIMUM_PWM,
+	OD_FAN_ZERO_RPM_ENABLE,
 };
 
 enum amd_pp_sensors {
@@ -199,6 +200,7 @@ enum PP_OD_DPM_TABLE_COMMAND {
 	PP_OD_EDIT_ACOUSTIC_TARGET,
 	PP_OD_EDIT_FAN_TARGET_TEMPERATURE,
 	PP_OD_EDIT_FAN_MINIMUM_PWM,
+	PP_OD_EDIT_FAN_ZERO_RPM_ENABLE,
 };
 
 struct pp_states_info {

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

@@ -4109,6 +4109,60 @@ static umode_t fan_minimum_pwm_visible(struct amdgpu_device *adev)
 	return umode;
 }
 
+/**
+ * DOC: fan_zero_rpm_enable
+ *
+ * The amdgpu driver provides a sysfs API for checking and adjusting the
+ * zero RPM feature.
+ *
+ * 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.
+ *
+ * If you want to reset to the default value, write "r" (reset) to the file to
+ * reset them.
+ */
+static ssize_t fan_zero_rpm_enable_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_ZERO_RPM_ENABLE, buf);
+}
+
+static ssize_t fan_zero_rpm_enable_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_ZERO_RPM_ENABLE,
+							     buf,
+							     count);
+}
+
+static umode_t fan_zero_rpm_enable_visible(struct amdgpu_device *adev)
+{
+	umode_t umode = 0000;
+
+	if (adev->pm.od_feature_mask & OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_RETRIEVE)
+		umode |= S_IRUSR | S_IRGRP | S_IROTH;
+
+	if (adev->pm.od_feature_mask & OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_SET)
+		umode |= S_IWUSR;
+
+	return umode;
+}
+
 static struct od_feature_set amdgpu_od_set = {
 	.containers = {
 		[0] = {
@@ -4154,6 +4208,14 @@ static struct od_feature_set amdgpu_od_set = {
 						.store = fan_minimum_pwm_store,
 					},
 				},
+				[5] = {
+					.name = "fan_zero_rpm_enable",
+					.ops = {
+						.is_visible = fan_zero_rpm_enable_visible,
+						.show = fan_zero_rpm_enable_show,
+						.store = fan_zero_rpm_enable_store,
+					},
+				},
 			},
 		},
 	},

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

@@ -328,6 +328,8 @@ struct config_table_setting
 #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)
+#define OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_RETRIEVE	BIT(10)
+#define OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_SET		BIT(11)
 
 struct amdgpu_pm {
 	struct mutex		mutex;

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

@@ -2895,6 +2895,8 @@ static enum smu_clk_type smu_convert_to_smuclk(enum pp_clock_type type)
 		clk_type = SMU_OD_FAN_TARGET_TEMPERATURE; break;
 	case OD_FAN_MINIMUM_PWM:
 		clk_type = SMU_OD_FAN_MINIMUM_PWM; break;
+	case OD_FAN_ZERO_RPM_ENABLE:
+		clk_type = SMU_OD_FAN_ZERO_RPM_ENABLE; break;
 	default:
 		clk_type = SMU_CLK_COUNT; break;
 	}

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

@@ -313,6 +313,7 @@ enum smu_clk_type {
 	SMU_OD_ACOUSTIC_TARGET,
 	SMU_OD_FAN_TARGET_TEMPERATURE,
 	SMU_OD_FAN_MINIMUM_PWM,
+	SMU_OD_FAN_ZERO_RPM_ENABLE,
 	SMU_CLK_COUNT,
 };
 

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

@@ -107,6 +107,7 @@
 #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 PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE		11
 
 #define LINK_SPEED_MAX					3
 
@@ -1130,6 +1131,10 @@ static void smu_v13_0_0_get_od_setting_limits(struct smu_context *smu,
 		od_min_setting = overdrive_lowerlimits->FanMinimumPwm;
 		od_max_setting = overdrive_upperlimits->FanMinimumPwm;
 		break;
+	case PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE:
+		od_min_setting = overdrive_lowerlimits->FanZeroRpmEnable;
+		od_max_setting = overdrive_upperlimits->FanZeroRpmEnable;
+		break;
 	default:
 		od_min_setting = od_max_setting = INT_MAX;
 		break;
@@ -1450,6 +1455,24 @@ static int smu_v13_0_0_print_clk_levels(struct smu_context *smu,
 				      min_value, max_value);
 		break;
 
+	case SMU_OD_FAN_ZERO_RPM_ENABLE:
+		if (!smu_v13_0_0_is_od_feature_supported(smu,
+							 PP_OD_FEATURE_ZERO_FAN_BIT))
+			break;
+
+		size += sysfs_emit_at(buf, size, "FAN_ZERO_RPM_ENABLE:\n");
+		size += sysfs_emit_at(buf, size, "%d\n",
+					(int)od_table->OverDriveTable.FanZeroRpmEnable);
+
+		size += sysfs_emit_at(buf, size, "%s:\n", "OD_RANGE");
+		smu_v13_0_0_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE,
+						  &min_value,
+						  &max_value);
+		size += sysfs_emit_at(buf, size, "ZERO_RPM_ENABLE: %u %u\n",
+				      min_value, max_value);
+		break;
+
 	case SMU_OD_RANGE:
 		if (!smu_v13_0_0_is_od_feature_supported(smu, PP_OD_FEATURE_GFXCLK_BIT) &&
 		    !smu_v13_0_0_is_od_feature_supported(smu, PP_OD_FEATURE_UCLK_BIT) &&
@@ -1547,6 +1570,11 @@ static int smu_v13_0_0_od_restore_table_single(struct smu_context *smu, long inp
 		od_table->OverDriveTable.FanMode = FAN_MODE_AUTO;
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
+	case PP_OD_EDIT_FAN_ZERO_RPM_ENABLE:
+		od_table->OverDriveTable.FanZeroRpmEnable =
+					boot_overdrive_table->OverDriveTable.FanZeroRpmEnable;
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_ZERO_FAN_BIT);
+		break;
 	default:
 		dev_info(adev->dev, "Invalid table index: %ld\n", input);
 		return -EINVAL;
@@ -1840,6 +1868,27 @@ static int smu_v13_0_0_od_edit_dpm_table(struct smu_context *smu,
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
 
+	case PP_OD_EDIT_FAN_ZERO_RPM_ENABLE:
+		if (!smu_v13_0_0_is_od_feature_supported(smu, PP_OD_FEATURE_ZERO_FAN_BIT)) {
+			dev_warn(adev->dev, "Zero RPM setting not supported!\n");
+			return -ENOTSUPP;
+		}
+
+		smu_v13_0_0_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE,
+						  &minimum,
+						  &maximum);
+		if (input[0] < minimum ||
+		    input[0] > maximum) {
+			dev_info(adev->dev, "zero RPM enable setting(%ld) must be within [%d, %d]!\n",
+				 input[0], minimum, maximum);
+			return -EINVAL;
+		}
+
+		od_table->OverDriveTable.FanZeroRpmEnable = input[0];
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_ZERO_FAN_BIT);
+		break;
+
 	case PP_OD_RESTORE_DEFAULT_TABLE:
 		if (size == 1) {
 			ret = smu_v13_0_0_od_restore_table_single(smu, input[0]);
@@ -2110,7 +2159,9 @@ static void smu_v13_0_0_set_supported_od_feature_mask(struct smu_context *smu)
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_RETRIEVE |
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET |
 					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE |
-					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET;
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET |
+					    OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_RETRIEVE |
+					    OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_SET;
 }
 
 static int smu_v13_0_0_set_default_od_settings(struct smu_context *smu)
@@ -2176,6 +2227,8 @@ static int smu_v13_0_0_set_default_od_settings(struct smu_context *smu)
 			user_od_table_bak.OverDriveTable.FanTargetTemperature;
 		user_od_table->OverDriveTable.FanMinimumPwm =
 			user_od_table_bak.OverDriveTable.FanMinimumPwm;
+		user_od_table->OverDriveTable.FanZeroRpmEnable =
+			user_od_table_bak.OverDriveTable.FanZeroRpmEnable;
 	}
 
 	smu_v13_0_0_set_supported_od_feature_mask(smu);

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

@@ -83,6 +83,7 @@
 #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 PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE		11
 
 #define LINK_SPEED_MAX					3
 
@@ -1119,6 +1120,10 @@ static void smu_v13_0_7_get_od_setting_limits(struct smu_context *smu,
 		od_min_setting = overdrive_lowerlimits->FanMinimumPwm;
 		od_max_setting = overdrive_upperlimits->FanMinimumPwm;
 		break;
+	case PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE:
+		od_min_setting = overdrive_lowerlimits->FanZeroRpmEnable;
+		od_max_setting = overdrive_upperlimits->FanZeroRpmEnable;
+		break;
 	default:
 		od_min_setting = od_max_setting = INT_MAX;
 		break;
@@ -1439,6 +1444,24 @@ static int smu_v13_0_7_print_clk_levels(struct smu_context *smu,
 				      min_value, max_value);
 		break;
 
+	case SMU_OD_FAN_ZERO_RPM_ENABLE:
+		if (!smu_v13_0_7_is_od_feature_supported(smu,
+							 PP_OD_FEATURE_ZERO_FAN_BIT))
+			break;
+
+		size += sysfs_emit_at(buf, size, "FAN_ZERO_RPM_ENABLE:\n");
+		size += sysfs_emit_at(buf, size, "%d\n",
+					(int)od_table->OverDriveTable.FanZeroRpmEnable);
+
+		size += sysfs_emit_at(buf, size, "%s:\n", "OD_RANGE");
+		smu_v13_0_7_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE,
+						  &min_value,
+						  &max_value);
+		size += sysfs_emit_at(buf, size, "ZERO_RPM_ENABLE: %u %u\n",
+				      min_value, max_value);
+		break;
+
 	case SMU_OD_RANGE:
 		if (!smu_v13_0_7_is_od_feature_supported(smu, PP_OD_FEATURE_GFXCLK_BIT) &&
 		    !smu_v13_0_7_is_od_feature_supported(smu, PP_OD_FEATURE_UCLK_BIT) &&
@@ -1535,6 +1558,11 @@ static int smu_v13_0_7_od_restore_table_single(struct smu_context *smu, long inp
 		od_table->OverDriveTable.FanMode = FAN_MODE_AUTO;
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
+	case PP_OD_EDIT_FAN_ZERO_RPM_ENABLE:
+		od_table->OverDriveTable.FanZeroRpmEnable =
+					boot_overdrive_table->OverDriveTable.FanZeroRpmEnable;
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_ZERO_FAN_BIT);
+		break;
 	default:
 		dev_info(adev->dev, "Invalid table index: %ld\n", input);
 		return -EINVAL;
@@ -1828,6 +1856,27 @@ static int smu_v13_0_7_od_edit_dpm_table(struct smu_context *smu,
 		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_FAN_CURVE_BIT);
 		break;
 
+	case PP_OD_EDIT_FAN_ZERO_RPM_ENABLE:
+		if (!smu_v13_0_7_is_od_feature_supported(smu, PP_OD_FEATURE_ZERO_FAN_BIT)) {
+			dev_warn(adev->dev, "Zero RPM setting not supported!\n");
+			return -ENOTSUPP;
+		}
+
+		smu_v13_0_7_get_od_setting_limits(smu,
+						  PP_OD_FEATURE_FAN_ZERO_RPM_ENABLE,
+						  &minimum,
+						  &maximum);
+		if (input[0] < minimum ||
+		    input[0] > maximum) {
+			dev_info(adev->dev, "zero RPM enable setting(%ld) must be within [%d, %d]!\n",
+				 input[0], minimum, maximum);
+			return -EINVAL;
+		}
+
+		od_table->OverDriveTable.FanZeroRpmEnable = input[0];
+		od_table->OverDriveTable.FeatureCtrlMask |= BIT(PP_OD_FEATURE_ZERO_FAN_BIT);
+		break;
+
 	case PP_OD_RESTORE_DEFAULT_TABLE:
 		if (size == 1) {
 			ret = smu_v13_0_7_od_restore_table_single(smu, input[0]);
@@ -2094,7 +2143,9 @@ static void smu_v13_0_7_set_supported_od_feature_mask(struct smu_context *smu)
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_RETRIEVE |
 					    OD_OPS_SUPPORT_FAN_TARGET_TEMPERATURE_SET |
 					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_RETRIEVE |
-					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET;
+					    OD_OPS_SUPPORT_FAN_MINIMUM_PWM_SET |
+					    OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_RETRIEVE |
+					    OD_OPS_SUPPORT_FAN_ZERO_RPM_ENABLE_SET;
 }
 
 static int smu_v13_0_7_set_default_od_settings(struct smu_context *smu)
@@ -2160,6 +2211,8 @@ static int smu_v13_0_7_set_default_od_settings(struct smu_context *smu)
 			user_od_table_bak.OverDriveTable.FanTargetTemperature;
 		user_od_table->OverDriveTable.FanMinimumPwm =
 			user_od_table_bak.OverDriveTable.FanMinimumPwm;
+		user_od_table->OverDriveTable.FanZeroRpmEnable =
+			user_od_table_bak.OverDriveTable.FanZeroRpmEnable;
 	}
 
 	smu_v13_0_7_set_supported_od_feature_mask(smu);