github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-11-06 21:58:01 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

hwmon: (gpd-fan) Reset both fans to automatic on duo boards

Browse Source 
On boards using gpd_duo_drvdata (GPD Duo, GPD Win 5), writing
pwm1_enable=2 only returns the first fan to EC control. The second fan
keeps its last manual duty cycle, e.g. full speed after pwm1=255, so a
fan control tool that exits leaves it running at that speed.

gpd_duo_write_pwm() writes both fan registers (pwm_write and
pwm_write + 1), but switching to automatic only clears pwm_write.
Also clear pwm_write + 1, so both fans return to EC control.

Tested on a GPD Win 5 (G1618-05). Not tested on the GPD Duo.

Fixes: 0ab88e2394 ("hwmon: add GPD devices sensor driver")
Cc: stable@vger.kernel.org
Signed-off-by: Alexei Solcanu <alexei.solcanu@pm.me>
Reviewed-by: Antheas Kapenekakis <lkml@antheas.dev>
Link: https://patch.msgid.link/20260926-gpd-fan-duo-auto-v2-1-0a2ea41ee3b5@pm.me
[groeck: Dropped obsolete 'Assisted-by: tag]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexei Solcanu 2026-09-26 16:11:20 -04:00 committed by Guenter Roeck
parent 743b4481b6
commit d1f60971fb
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/hwmon/gpd-fan.c
View File

@ -444,6 +444,7 @@ static void gpd_duo_set_pwm_enable(struct gpd_fan_data *data, enum FAN_PWM_ENABL
break;
case AUTOMATIC:
gpd_ecram_write(data->drvdata, data->drvdata->pwm_write, 0);
gpd_ecram_write(data->drvdata, data->drvdata->pwm_write + 1, 0);
break;
}
}