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drm/nouveau/therm: force a minimum hysteresis on temperature alarm thresholds

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This should avoid the situation where a user gets its kernel logs flooded when
temperature oscillates around a threshold with 0°C hysteresis.

This patch is just meant to fix broken vbios (as reported on a nv4e on
sysfs hwmon interface.

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Martin Peres 2012-12-08 14:00:38 +01:00 committed by Ben Skeggs
parent f1aa4a1de5
commit 3600ad5e1b
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/nouveau/core/subdev/therm/temp.c
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@ -58,11 +58,18 @@ static void
nouveau_therm_temp_safety_checks(struct nouveau_therm *therm)
{
struct nouveau_therm_priv *priv = (void *)therm;
struct nvbios_therm_sensor *s = &priv->bios_sensor;
if (!priv->bios_sensor.slope_div)
priv->bios_sensor.slope_div = 1;
if (!priv->bios_sensor.offset_den)
priv->bios_sensor.offset_den = 1;
/* enforce a minimum hysteresis on thresholds */
s->thrs_fan_boost.hysteresis = max_t(u8, s->thrs_fan_boost.hysteresis, 2);
s->thrs_down_clock.hysteresis = max_t(u8, s->thrs_down_clock.hysteresis, 2);
s->thrs_critical.hysteresis = max_t(u8, s->thrs_critical.hysteresis, 2);
s->thrs_shutdown.hysteresis = max_t(u8, s->thrs_shutdown.hysteresis, 2);
}
/* must be called with alarm_program_lock taken ! */