Re: [PATCH 2/2] hwmon: (nct6683) Make the fan curves of NCT6687D-R writable

[Guenter Roeck <linux@roeck-us.net>]

On Mon, Nov 09, 2026 at 11:34:42PM +0100, Tomasz Bojanowski wrote:
> Allow writing pwmN_auto_point[1-7]_temp and pwmN_auto_point[1-7]_pwm in
> manual and in automatic mode. The points are writable if, when the driver
> is loaded, the temperatures and the duty cycles of the curve do not
> decrease and the temperatures are at most 127 degrees Celsius. The EC
> firmware is not documented and does not take a curve whose duty cycles
> decrease, so only curves like those set by the BIOS are written. The
> limit of 127 degrees Celsius reads the same whether the EC treats the
> temperature registers as signed or unsigned.
> 
> Temperatures and duty cycles are clamped to those of the adjacent points,
> temperatures also to 0-127 degrees Celsius and duty cycles to 0-255. The
> whole curve is written in one configuration phase and read back, to check
> that the EC uses it as written. If that fails while the EC responds, the
> previous curve is written again.
> 
> The BIOS may restore its own settings when resuming from suspend, so
> restore the curves written through sysfs on resume, before manual mode.
> 
> Tested on an MSI MAG B850M MORTAR WIFI (MS-7E61) with pwm16: writing and
> clamping of curve points, the written curve after suspend to RAM, and
> manual mode after resume.
> 
> Signed-off-by: Tomasz Bojanowski <tomasz@bojanowski.me>

Applied.

Thanks,
Guenter