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authorDuncan Laurie <dlaurie@chromium.org>2013-07-31 15:35:55 -0700
committerPatrick Georgi <patrick@georgi-clan.de>2013-12-21 12:02:18 +0100
commit5fcfece7568f55b205f095aaa310e4ea95054bad (patch)
tree85808da63b91e82b73cad1cbbc8228d8f7e27d3a /src/southbridge
parentd338b46504bde900a18fc32eff7cda14ba3711b4 (diff)
falco: Enable EC controlled throttling
When the EC requests the host to throttle (for charging or thermal related reasons) the package power consumption will be limited. Right now this is set at 12W but that is somewhat arbitrary and may need tuning. 1) define the THRT method in \_TZ scope for EC to call 2) enable SCI events for throttle start and stop 3) define the power limit at 12W and set it in NVS 1) Enable CONFIG_ACPI_DEBUG=y in the kernel 2) Enable the Debug object event in acpi module acpi.debug_layer=0x7f acpi.debug_level=0x2f 3) Using EC console generate host event for throttle start > hostevent set 0x20000 4) Check dmesg for throttle start events ACPI: Execute Method [\_SB_.PCI0.LPCB.EC0_._Q12] (Node ffff8801002c5988) [ACPI Debug] String [0x12] "EC: THROTTLE START" [ACPI Debug] String [0x10] "Enable PL1 Limit" 5) Using EC console generate host event for throttle stop > hostevent set 0x40000 6) Check dmesg for throttle stop events ACPI: Execute Method [\_SB_.PCI0.LPCB.EC0_._Q13] (Node ffff8801002c59b0) [ACPI Debug] String [0x11] "EC: THROTTLE STOP" [ACPI Debug] String [0x11] "Disable PL1 Limit" Change-Id: I39b53a5e8abc2892846bcd214a333fe204c6da9b Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/63989 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/4416 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
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