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This enables the C4 low power state on the lenovo x200 and t400.
It's inspired by the thread on the mailinglist:
"[coreboot] Lenovo X200 running Coreboot drains 3-4W more power
than with Vendor BIOS".
What this does, is to enable a C3 state using MWAIT(C3) request
and set the southbridge config c4onc3_enable to automatically
upgrade C3 to the lower power C4 state.
The latency (0x37) is the same value used by the vendor bios.
With C4 enabled the idle power consumption is about ~2-3W lower.
TEST= build and install on target. Use powertop top to measure power
usage. To manually disable c-state to compare them,
do (tested on linux 4.4):
echo 1 > /sys/devices/system/cpu/cpu*/cpuidle/stateX/disable
Change-Id: I1a1663a7662ebc7157a965667680688ad6a33545
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/15251
Tested-by: build bot (Jenkins)
Reviewed-by: Swift Geek
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
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Change-Id: Ia1f24d328a065a54975adde067df36c5751bff2d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15987
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
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It encourages users from writing to the FSF without giving an address.
Linux also prefers to drop that and their checkpatch.pl (that we
imported) looks out for that.
This is the result of util/scripts/no-fsf-addresses.sh with no further
editing.
Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/11888
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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Change-Id: If2d48b84fe7bd7b144e96171e54067891e3c4e2e
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/9316
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
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