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authorStefan Reinauer <reinauer@chromium.org>2014-02-14 13:41:39 -0800
committerPatrick Georgi <patrick@georgi-clan.de>2014-07-12 20:17:01 +0200
commitc63ad997a5e4614cfb12f3d1743e86b21e6e31af (patch)
tree4c18422afb01196ebd89d4a24115231caca343ab /src/mainboard/wyse
parent123fa689877a3ab30ffbc32586f3e23ca1f2fcf0 (diff)
google/panther: acpi: Fix unstable fan behavior on boot + resume
FLVL is used to keep track of which thermal zones are active, but it is not initialized upon boot / resume. An initial value of zero corresponds to all zones being active, which causes the fan to spin at max speed until the OS changes zones. Fix this annoyance by initializing FLVL to the lowest temperature zone. Also, fix a related bug where FLVL may jump to an undesired value. For example, if FLVL=3 (zones 3 + 4 active), and zone 0 is set to off (it's already off!), FLVL would previously become 1 (zones 1 + 2 + 3 + 4 active!). Fix this by not taking zone ON / OFF actions if our zone is already ON / OFF. BUG=chrome-os-partner:25766, chrome-os-partner:24775 TEST=Suspend / resume on Panther 20 times, verify that thermal zone after resume matches expectation based upon temperature. Also, stress system and verify thermal zones become active according to temperature increase. Change-Id: Ic60686aa5a67bf40c17497832b086ba09d56111a Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Signed-off-by: Stefan Reinauer <reinauer@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/186455 Reviewed-by: Stefan Reinauer <reinauer@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org> Tested-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/186669 Commit-Queue: Stefan Reinauer <reinauer@chromium.org> Tested-by: Stefan Reinauer <reinauer@chromium.org> Reviewed-on: http://review.coreboot.org/6006 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
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