From: Johannes Kirchmair <johannes.kirchmair@xxxxxxxxxxx> The pwm1_enable attribute of the pwmfan driver influences the mode of operation, especially in case of a requested pwm1 duty cycle of zero. Especially setting pwm1_enable to two, should keep the pwm controller enabled even if the duty cycle is set to zero [1]. This is not the case at the moment, as the pwm controller is disabled always if pwm1 is set to zero. This commit tries to fix this behavior. [1] https://docs.kernel.org/hwmon/pwm-fan.html Signed-off-by: Johannes Kirchmair <johannes.kirchmair@xxxxxxxxxxx> --- drivers/hwmon/pwm-fan.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index a1712649b07e..c434db4656e7 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -167,7 +167,7 @@ static int pwm_fan_power_on(struct pwm_fan_ctx *ctx) return ret; } -static int pwm_fan_power_off(struct pwm_fan_ctx *ctx) +static int pwm_fan_power_off(struct pwm_fan_ctx *ctx, bool force_disable) { struct pwm_state *state = &ctx->pwm_state; bool enable_regulator = false; @@ -180,7 +180,8 @@ static int pwm_fan_power_off(struct pwm_fan_ctx *ctx) state, &enable_regulator); - state->enabled = false; + if (force_disable) + state->enabled = false; state->duty_cycle = 0; ret = pwm_apply_might_sleep(ctx->pwm, state); if (ret) { @@ -213,7 +214,7 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) return ret; ret = pwm_fan_power_on(ctx); } else { - ret = pwm_fan_power_off(ctx); + ret = pwm_fan_power_off(ctx, false); } if (!ret) ctx->pwm_value = pwm; @@ -468,7 +469,7 @@ static void pwm_fan_cleanup(void *__ctx) del_timer_sync(&ctx->rpm_timer); /* Switch off everything */ ctx->enable_mode = pwm_disable_reg_disable; - pwm_fan_power_off(ctx); + pwm_fan_power_off(ctx, true); } static int pwm_fan_probe(struct platform_device *pdev) @@ -661,7 +662,7 @@ static int pwm_fan_suspend(struct device *dev) { struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); - return pwm_fan_power_off(ctx); + return pwm_fan_power_off(ctx, true); } static int pwm_fan_resume(struct device *dev) -- 2.34.1
