[coreboot] Patch merged into coreboot/master: 364dbdd CPU: Add basic support for Nominal Configurable TDP

[gerrit at coreboot.org]

the following patch was just integrated into master:
commit 364dbdd0177ff1fb5bbf398217fcae01ef296d1e
Author: Duncan Laurie <dlaurie at chromium.org>
Date:   Mon Jun 25 09:51:59 2012 -0700

    CPU: Add basic support for Nominal Configurable TDP
    
    Ivybridge B0+ CPUs are capable of supporting multiple TDP levels.
    This complicates the default case because now the registers that
    were reporting max non-turbo ratio are reporting that value for
    the highest possible TDP level.
    
    For now this change just forces everything to use the Nominal TDP
    values instead of the higher (or lower) levels.
    
    - When building P-state tables, determine the P[1] (max non turbo)
    ratio based on the Nominal ratio if available.
    - Set the turbo activation ratio to the Nominal max ratio.
    - Mirror the power level settings in new MCHBAR register after
    they are written, which happens after BIOS_RESET_CPL is set.
    - Set the current ratio to Nominal ratio at boot.
    
    1) Verify that P-state table is generated properly with
    P[0]=1801MHz (ratio 0x1C) and P[1]=1800MHz (ratio 0x12)
    
    PSS: 1801MHz power 17000 control 0x1c00 status 0x1c00
    PSS: 1800MHz power 17000 control 0x1200 status 0x1200
    
    2) Verify power limits in MCHBAR match PKG_POWER_LIMIT:
    
    > rdmsr 0 0x610
    0x800080aa00dc8088
    > mmio_read32 0xfed159a4
    0x000080aa
    > mmio_read32 0xfed159a0
    0x00dc8088
    
    3) Verify turbo activation ratio is set to nominal ratio:
    
    > rdmsr 0 0x64c
    0x0000000000000012
    
    4) Check that proper ratio was set at boot on one core only:
    
    > grep 'frequency set to' /sys/firmware/log
    model_x06ax: frequency set to 1800
    model_x06ax: frequency set to 1800
    model_x06ax: frequency set to 1800
    model_x06ax: frequency set to 1800
    
    Change-Id: I592e60a7740f31b140986a8269dca91b4adbb270
    Signed-off-by: Duncan Laurie <dlaurie at chromium.org>

Build-Tested: build bot (Jenkins) at Tue Jul 24 12:57:13 2012, giving +1
Reviewed-By: Ronald G. Minnich <rminnich at gmail.com> at Tue Jul 24 23:39:44 2012, giving +2
See http://review.coreboot.org/1304 for details.

-gerrit