Branch: refs/heads/UDK2018
Home: https://github.com/tianocore/edk2
Commit: 3885ffd8418a17fc6d59ae0e2e34e95f1dce7a72
https://github.com/tianocore/edk2/commit/3885ffd8418a17fc6d59ae0e2e34e95f1dce7a72
Author: Ruiyu Ni <ruiyu...@intel.com>
Date: 2018-02-08 (Thu, 08 Feb 2018)
Changed paths:
M UefiCpuPkg/Library/CpuCommonFeaturesLib/ClockModulation.c
Log Message:
-----------
UefiCpuPkg/FeaturesLib: Fix Haswell CPU hang with 50% throttling
Today's implementation only assumes SandyBridge CPU supports
Extended On-Demand Clock Modulation Duty Cycle.
Actually it is supported when CPUID.06h.EAX[5] == 1.
When platform requests 50% throttling, it causes value 1000b
set to the low-4 bits of IA32_CLOCK_MODULATION.
But the wrong code sets 1000b to bits[1-3] which causes assertion.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu...@intel.com>
Cc: Jeff Fan <vanjeff_...@hotmail.com>
Reviewed-by: Eric Dong <eric.d...@intel.com>
(cherry picked from commit 0c8b88022372846a377c424f46e671d8868d4ece)
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