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soc/intel/apollolake: Set CPU to Max Non-Turbo Ratio 

If the Running Average Power Limits (RAPL) feature is disabled, the CPU
should be set to the Max Non-Turbo Ratio. RAPL is switched off by
CONFIG_APL_SKIP_SET_POWER_LIMITS. Furthermore, a frequency change should
be prevented by disabling Enhanced Intel Speedstep Technology (EIST). So
the CPU should run with constant frequency with this setting.

Change-Id: I67020f7e75700255629294fd9bcf67ee01765a01
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/22148
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Mario Scheithauer 2017-10-24 16:57:26 +02:00 committed by Werner Zeh
parent 36e40e40a7
commit d0e51330ed
1 changed files with 7 additions and 0 deletions
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7
src/soc/intel/apollolake/cpu.c
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@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2015-2017 Intel Corp.
* Copyright (C) 2017 Siemens AG, Inc.
* (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
* (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
*
@ -84,6 +85,12 @@ void soc_core_init(device_t cpu)
/* Configure Core PRMRR for SGX. */
if (IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_SGX))
prmrr_core_configure();
/* Set Max Non-Turbo ratio if RAPL is disabled. */
if (IS_ENABLED(CONFIG_APL_SKIP_SET_POWER_LIMITS)) {
cpu_set_p_state_to_max_non_turbo_ratio();
cpu_disable_eist();
}
}
#if !IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_CPU_MPINIT)