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authorMatthew Garrett <mjg59@srcf.ucam.org>2008-12-03 21:00:38 +0300
committerLen Brown <len.brown@intel.com>2009-03-27 23:58:22 +0300
commit03a971a2899886006f19f3495973bbd646d8bdae (patch)
tree6b82e8d67ca5eaf94fce4bd419276d90ac281c8e /sound
parentf6f5c45e06e86d94621cd5c1c4508bdee1952fc8 (diff)
downloadlinux-03a971a2899886006f19f3495973bbd646d8bdae.tar.xz
thermal: support forcing support for passive cooling
Due to poor thermal design or Linux driving hardware outside its thermal envelope, some systems will reach critical temperature and shut down under high load. This patch adds support for forcing a polling-based passive trip point if the firmware doesn't provide one. The assumption is made that the processor is the most practical means to reduce the dynamic heat generation, so hitting the passive thermal limit will cause the CPU to be throttled until the temperature stabalises around the defined value. UI is provided via a "passive" sysfs entry in the thermal zone directory. It accepts a decimal value in millidegrees celsius, or "0" to disable the functionality. Default behaviour is for this functionality to be disabled. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
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