[coreboot-gerrit] Patch merged into coreboot/master: intel/skylake: disable ACPI PM Timer to enable XTAL OSC shutdown

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 6c1bf27daee6470fb35383dd180bc9b4cb368eab
Author: Archana Patni <archana.patni at intel.com>
Date:   Fri Dec 18 23:38:21 2015 +0530

    intel/skylake: disable ACPI PM Timer to enable XTAL OSC shutdown
    
    Keeping ACPI PM timer alive prevents XTAL OSC shutdown in S0ix
    which has a power impact.
    
    Based on a DT variable, this patch disables the ACPI PM timer
    late in the boot sequence - disabling earlier will lead to a hang
    since the FSP boot flow needs this timer. This also hides the ACPI PM
    timer from the OS by removing from FADT table. Once the ACPI PM timer
    is disabled, TCO gets switched off as well.
    
    BRANCH=none
    BUG=chrome-os-partner:48646
    TEST=Build for skylake board with the PmTimerDisabled policy in
    devicetree set to 1.
    iotools mmio_read32 0xfe0000fc should return 0x2.
    cat /sys/devices/system/clocksource/clocksource0/available_clocksource
    should list only "tsc hpet". acpi_pm should be removed from this list.
    
    Change-Id: Icfdc51bc33b5190a55196d67e18afdaaa2f9b310
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: 18bcb8a434b029295e1f1cc925e2b47e79254583
    Original-Change-Id: Ifebe8bb5a7978339e07e4e12e174b9b978135467
    Original-Signed-off-by: Archana Patni <archana.patni at intel.com>
    Original-Signed-off-by: Subramony Sesha <subramony.sesha at intel.com>
    Original-Reviewed-on: https://chromium-review.googlesource.com/319361
    Original-Reviewed-by: Duncan Laurie <dlaurie at chromium.org>
    Reviewed-on: https://review.coreboot.org/13588
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer <stefan.reinauer at coreboot.org>


See https://review.coreboot.org/13588 for details.

-gerrit