From: Lorenz Brun <lorenz@brun.one>
To: Jean Delvare <jdelvare@suse.com>, Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] hwmon: pwm-fan: set usage_power on PWM state
Date: Thu, 9 Mar 2023 02:10:08 +0100 [thread overview]
Message-ID: <20230309011009.2109696-1-lorenz@brun.one> (raw)
PWM fans are controlled solely by the duty cycle of the PWM signal, they
do not care about the exact timing. Thus set usage_power to true to
allow less flexible hardware to work as a PWM source for fan control.
Signed-off-by: Lorenz Brun <lorenz@brun.one>
---
drivers/hwmon/pwm-fan.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 83a347ca35da..aa746c2bde39 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -507,6 +507,14 @@ static int pwm_fan_probe(struct platform_device *pdev)
pwm_init_state(ctx->pwm, &ctx->pwm_state);
+ /*
+ * PWM fans are controlled solely by the duty cycle of the PWM signal,
+ * they do not care about the exact timing. Thus set usage_power to true
+ * to allow less flexible hardware to work as a PWM source for fan
+ * control.
+ */
+ ctx->pwm_state.usage_power = true;
+
/*
* set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
* long. Check this here to prevent the fan running at a too low
--
2.39.2
next reply other threads:[~2023-03-09 1:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 1:10 Lorenz Brun [this message]
2023-03-16 2:26 ` [PATCH] hwmon: pwm-fan: set usage_power on PWM state Guenter Roeck
2023-03-17 11:33 ` Lorenz Brun
2023-03-21 15:03 ` Guenter Roeck
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