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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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Instead of hardcoding the PCI mmio size read it from devicetree.
Set a default value of 2048 MiB and 1024MiB for laptops without
discrete graphics.
Tested on Sandybridge Lenovo T520.
Change-Id: I791ebd6897c5ba4e2e18bd307d320568b1378a13
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/15140
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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Enable the PEG device in devicetree to expose the
device if any. This is already default behaviour
for T5xx series.
Change-Id: I16bd253ca96c4cdaad8a829f6490cec9e2599b5f
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/14448
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
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Only one value would work with corresponding gma code currently (which one
depends on board). Going forward, it's possible to compute which number can
be used, so there is no need to keep this info around.
Change-Id: Iadc77ef94b02f892860e3ae8d70a0a792758565d
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11862
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
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Based on the info by Felix Held.
Change-Id: Iab84dd8a0e3c942da20a6e21db5510e4ad16cadd
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11857
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
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Change-Id: Ic3503938b996bbf31f1417923f019a7bc722b9fd
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/10429
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Tested-by: build bot (Jenkins)
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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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