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From: Guenter Roeck <linux@roeck-us.net>
To: linux-hwmon@vger.kernel.org
Cc: Jean Delvare <jdelvare@suse.com>,
	jan.kundrat@cesnet.cz, kubernat@cesnet.cz,
	Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH 1/7] hwmon: (max31790) Fix fan speed reporting for fan7..12
Date: Wed, 26 May 2021 08:40:16 -0700
Message-ID: <20210526154022.3223012-2-linux@roeck-us.net> (raw)
In-Reply-To: <20210526154022.3223012-1-linux@roeck-us.net>

Fans 7..12 do not have their own set of configuration registers.
So far the code ignored that and read beyond the end of the configuration
register range to get the tachometer period. This resulted in more or less
random fan speed values for those fans.

The datasheet is quite vague when it comes to defining the tachometer
period for fans 7..12. Experiments confirm that the period is the same
for both fans associated with a given set of configuration registers.

Fixes: 54187ff9d766 ("hwmon: (max31790) Convert to use new hwmon registration API")
Fixes: 195a4b4298a7 ("hwmon: Driver for Maxim MAX31790")
Cc: Jan Kundrát <jan.kundrat@cesnet.cz>
Cc: Václav Kubernát <kubernat@cesnet.cz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/hwmon/max31790.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 86e6c71db685..f6d4fc0a2f13 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -170,7 +170,7 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
 
 	switch (attr) {
 	case hwmon_fan_input:
-		sr = get_tach_period(data->fan_dynamics[channel]);
+		sr = get_tach_period(data->fan_dynamics[channel % NR_CHANNEL]);
 		rpm = RPM_FROM_REG(data->tach[channel], sr);
 		*val = rpm;
 		return 0;
-- 
2.25.1


  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-26 15:40 [PATCH 0/7] hwmon: (max31790) Fixes and improvements Guenter Roeck
2021-05-26 15:40 ` Guenter Roeck [this message]
2021-06-02 12:27   ` [PATCH 1/7] hwmon: (max31790) Fix fan speed reporting for fan7..12 Jan Kundrát
2021-05-26 15:40 ` [PATCH 2/7] hwmon: (max31790) Report correct current pwm duty cycles Guenter Roeck
2021-06-01  7:51   ` Václav Kubernát
2021-06-02 12:36   ` Jan Kundrát
2021-05-26 15:40 ` [PATCH 3/7] hwmon: (max31790) Fix pwmX_enable attributes Guenter Roeck
2021-06-01  8:01   ` Václav Kubernát
2021-06-02 10:47     ` Guenter Roeck
2021-06-02 12:44   ` Jan Kundrát
2021-05-26 15:40 ` [PATCH 4/7] hwmon: (max31790) Add support for fanX_enable attributes Guenter Roeck
2021-06-01  8:02   ` Václav Kubernát
2021-06-02 13:04   ` Jan Kundrát
2021-06-02 16:43     ` Guenter Roeck
2021-05-26 15:40 ` [PATCH 5/7] hwmon: (max31790) Clear fan fault after reporting it Guenter Roeck
2021-06-01  8:08   ` Václav Kubernát
2021-05-26 15:40 ` [PATCH 6/7] hwmon: (max31790) Detect and report zero fan speed Guenter Roeck
2021-06-01  8:11   ` Václav Kubernát
2021-05-26 15:40 ` [PATCH 7/7] hwmon: (max31790) Add support for fanX_min attributes Guenter Roeck
2021-06-01  8:19   ` Václav Kubernát
2021-06-01  8:29 ` [PATCH 0/7] hwmon: (max31790) Fixes and improvements Václav Kubernát
2021-06-01 12:08   ` Guenter Roeck

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