diff options
Diffstat (limited to 'drivers/hwmon/mlxreg-fan.c')
| -rw-r--r-- | drivers/hwmon/mlxreg-fan.c | 84 |
1 files changed, 27 insertions, 57 deletions
diff --git a/drivers/hwmon/mlxreg-fan.c b/drivers/hwmon/mlxreg-fan.c index 4a8becdb0d58..b48bd7c961d6 100644 --- a/drivers/hwmon/mlxreg-fan.c +++ b/drivers/hwmon/mlxreg-fan.c @@ -18,15 +18,6 @@ #define MLXREG_FAN_MAX_STATE 10 #define MLXREG_FAN_MIN_DUTY 51 /* 20% */ #define MLXREG_FAN_MAX_DUTY 255 /* 100% */ -/* - * Minimum and maximum FAN allowed speed in percent: from 20% to 100%. Values - * MLXREG_FAN_MAX_STATE + x, where x is between 2 and 10 are used for - * setting FAN speed dynamic minimum. For example, if value is set to 14 (40%) - * cooling levels vector will be set to 4, 4, 4, 4, 4, 5, 6, 7, 8, 9, 10 to - * introduce PWM speed in percent: 40, 40, 40, 40, 40, 50, 60. 70, 80, 90, 100. - */ -#define MLXREG_FAN_SPEED_MIN (MLXREG_FAN_MAX_STATE + 2) -#define MLXREG_FAN_SPEED_MAX (MLXREG_FAN_MAX_STATE * 2) #define MLXREG_FAN_SPEED_MIN_LEVEL 2 /* 20 percent */ #define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF 44 #define MLXREG_FAN_TACHO_DIV_MIN 283 @@ -87,13 +78,16 @@ struct mlxreg_fan_tacho { * @connected: indicates if PWM is connected; * @reg: register offset; * @cooling: cooling device levels; + * @last_hwmon_state: last cooling state set by hwmon subsystem; + * @last_thermal_state: last cooling state set by thermal subsystem; * @cdev: cooling device; */ struct mlxreg_fan_pwm { struct mlxreg_fan *fan; bool connected; u32 reg; - u8 cooling_levels[MLXREG_FAN_MAX_STATE + 1]; + unsigned long last_hwmon_state; + unsigned long last_thermal_state; struct thermal_cooling_device *cdev; }; @@ -119,6 +113,9 @@ struct mlxreg_fan { int divider; }; +static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state); + static int mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) @@ -213,6 +210,18 @@ mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, val > MLXREG_FAN_MAX_DUTY) return -EINVAL; pwm = &fan->pwm[channel]; + /* If thermal is configured - handle PWM limit setting. */ + if (IS_REACHABLE(CONFIG_THERMAL)) { + pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(val); + /* + * Update PWM only in case requested state is not less than the + * last thermal state. + */ + if (pwm->last_hwmon_state >= pwm->last_thermal_state) + return mlxreg_fan_set_cur_state(pwm->cdev, + pwm->last_hwmon_state); + return 0; + } return regmap_write(fan->regmap, pwm->reg, val); default: return -EOPNOTSUPP; @@ -338,58 +347,22 @@ static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev, { struct mlxreg_fan_pwm *pwm = cdev->devdata; struct mlxreg_fan *fan = pwm->fan; - unsigned long cur_state; - int i, config = 0; - u32 regval; int err; - /* - * Verify if this request is for changing allowed FAN dynamical - * minimum. If it is - update cooling levels accordingly and update - * state, if current state is below the newly requested minimum state. - * For example, if current state is 5, and minimal state is to be - * changed from 4 to 6, fan->cooling_levels[0 to 5] will be changed all - * from 4 to 6. And state 5 (fan->cooling_levels[4]) should be - * overwritten. - */ - if (state >= MLXREG_FAN_SPEED_MIN && state <= MLXREG_FAN_SPEED_MAX) { - /* - * This is configuration change, which is only supported through sysfs. - * For configuration non-zero value is to be returned to avoid thermal - * statistics update. - */ - config = 1; - state -= MLXREG_FAN_MAX_STATE; - for (i = 0; i < state; i++) - pwm->cooling_levels[i] = state; - for (i = state; i <= MLXREG_FAN_MAX_STATE; i++) - pwm->cooling_levels[i] = i; - - err = regmap_read(fan->regmap, pwm->reg, ®val); - if (err) { - dev_err(fan->dev, "Failed to query PWM duty\n"); - return err; - } - - cur_state = MLXREG_FAN_PWM_DUTY2STATE(regval); - if (state < cur_state) - return config; - - state = cur_state; - } - if (state > MLXREG_FAN_MAX_STATE) return -EINVAL; - /* Normalize the state to the valid speed range. */ - state = pwm->cooling_levels[state]; + /* Save thermal state. */ + pwm->last_thermal_state = state; + + state = max_t(unsigned long, state, pwm->last_hwmon_state); err = regmap_write(fan->regmap, pwm->reg, MLXREG_FAN_PWM_STATE2DUTY(state)); if (err) { dev_err(fan->dev, "Failed to write PWM duty\n"); return err; } - return config; + return 0; } static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = { @@ -564,7 +537,7 @@ static int mlxreg_fan_config(struct mlxreg_fan *fan, static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan) { - int i, j; + int i; for (i = 0; i < MLXREG_FAN_MAX_PWM; i++) { struct mlxreg_fan_pwm *pwm = &fan->pwm[i]; @@ -579,11 +552,8 @@ static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan) return PTR_ERR(pwm->cdev); } - /* Init cooling levels per PWM state. */ - for (j = 0; j < MLXREG_FAN_SPEED_MIN_LEVEL; j++) - pwm->cooling_levels[j] = MLXREG_FAN_SPEED_MIN_LEVEL; - for (j = MLXREG_FAN_SPEED_MIN_LEVEL; j <= MLXREG_FAN_MAX_STATE; j++) - pwm->cooling_levels[j] = j; + /* Set minimal PWM speed. */ + pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(MLXREG_FAN_MIN_DUTY); } return 0; |