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drm/nouveau/fan: handle the cases where we are outside of the linear zone 

This fixes a bug where, when temperature is outside of the linear range, fan
pwm would be outside of the allowed range ([0, 100]) and could get negative in
some cases.

It seems like a regression that happened when we re-worked the fan management
logic before merging.

Tested-by: Ozan Çağlayan <ozancag@gmail.com>
Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Martin Peres 2012-12-20 01:32:09 +01:00 committed by Ben Skeggs
parent 93260d3c02
commit a624bafbf1
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/nouveau/core/subdev/therm/base.c
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@ -71,6 +71,13 @@ nouveau_therm_update_linear(struct nouveau_therm *therm)
u8 temp = therm->temp_get(therm);
u16 duty;
/* handle the non-linear part first */
if (temp < linear_min_temp)
return priv->fan->bios.min_duty;
else if (temp > linear_max_temp)
return priv->fan->bios.max_duty;
/* we are in the linear zone */
duty = (temp - linear_min_temp);
duty *= (priv->fan->bios.max_duty - priv->fan->bios.min_duty);
duty /= (linear_max_temp - linear_min_temp);