[PATCH net-next 7/8] mlxsw: thermal: Add function for reading module temperature and thresholds
From: Ido Schimmel <hidden>
Date: 2021-06-08 12:45:00
Subsystem:
mellanox ethernet switch drivers, networking drivers, the rest · Maintainers:
Ido Schimmel, Petr Machata, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Mykola Kostenok <redacted> Provide new function mlxsw_thermal_module_temp_and_thresholds_get() for reading temperature and temperature thresholds by a single operation. The motivation is to reduce the number of transactions with the device which is important when operating over a slow bus such as I2C. Currently, the sole caller of the function is only using it to read the module's temperature. The next patch will also use it to query the module's temperature thresholds. Signed-off-by: Mykola Kostenok <redacted> Acked-by: Vadim Pasternak <vadimp@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> --- .../ethernet/mellanox/mlxsw/core_thermal.c | 50 +++++++++++++------ 1 file changed, 35 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index 8d844d3c2e40..e1ef913c81ef 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c@@ -420,29 +420,49 @@ static int mlxsw_thermal_module_unbind(struct thermal_zone_device *tzdev, return err; } +static void +mlxsw_thermal_module_temp_and_thresholds_get(struct mlxsw_core *core, + u16 sensor_index, int *p_temp, + int *p_crit_temp, + int *p_emerg_temp) +{ + char mtmp_pl[MLXSW_REG_MTMP_LEN]; + int err; + + /* Read module temperature and thresholds. */ + mlxsw_reg_mtmp_pack(mtmp_pl, sensor_index, false, false); + err = mlxsw_reg_query(core, MLXSW_REG(mtmp), mtmp_pl); + if (err) { + /* Set temperature and thresholds to zero to avoid passing + * uninitialized data back to the caller. + */ + *p_temp = 0; + *p_crit_temp = 0; + *p_emerg_temp = 0; + + return; + } + mlxsw_reg_mtmp_unpack(mtmp_pl, p_temp, NULL, p_crit_temp, p_emerg_temp, + NULL); +} + static int mlxsw_thermal_module_temp_get(struct thermal_zone_device *tzdev, int *p_temp) { struct mlxsw_thermal_module *tz = tzdev->devdata; struct mlxsw_thermal *thermal = tz->parent; - struct device *dev = thermal->bus_info->dev; - char mtmp_pl[MLXSW_REG_MTMP_LEN]; + struct device *dev; + u16 sensor_index; int temp; int err; - /* Read module temperature. */ - mlxsw_reg_mtmp_pack(mtmp_pl, MLXSW_REG_MTMP_MODULE_INDEX_MIN + - tz->module, false, false); - err = mlxsw_reg_query(thermal->core, MLXSW_REG(mtmp), mtmp_pl); - if (err) { - /* Do not return error - in case of broken module's sensor - * it will cause error message flooding. - */ - temp = 0; - *p_temp = (int) temp; - return 0; - } - mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL, NULL, NULL); + dev = thermal->bus_info->dev; + sensor_index = MLXSW_REG_MTMP_MODULE_INDEX_MIN + tz->module; + + /* Read module temperature and thresholds. */ + mlxsw_thermal_module_temp_and_thresholds_get(thermal->core, + sensor_index, &temp, NULL, + NULL); *p_temp = temp; if (!temp)
--
2.31.1