soc/intel/alderlake: Set Energy Perf Bias appropriate default value
The current "normal" EPB (six) setting resulted in the desired out of box power and performance for several CPU generations. However, a power and performance analysis on Alder Lake and Raptor Lake CPUs demonstrates that this value results in undesirable higher uncore power and that seven is a more appropriate value. Note: the Linux kernel "4ecc933b x86: intel_epb: Allow model specific normal EPB value" patch sets the EPB to 7 for Alder Lake. BRANCH=firmware-brya-14505.B BUG=b:239853069 TEST=verify that EPB is set by coreboot Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com> Change-Id: I5784656903d4c58bedc5063ee3ef310a99711050 Reviewed-on: https://review.coreboot.org/c/coreboot/+/66059 Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com> Reviewed-by: Cliff Huang <cliff.huang@intel.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@ -129,8 +129,9 @@ void soc_core_init(struct device *cpu)
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/* Enable Direct Cache Access */
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/* Enable Direct Cache Access */
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configure_dca_cap();
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configure_dca_cap();
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/* Set energy policy */
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/* Set energy policy. The "normal" EPB (6) is not suitable for Alder
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set_energy_perf_bias(ENERGY_POLICY_NORMAL);
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* Lake or Raptor Lake CPUs, as this results in higher uncore power. */
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set_energy_perf_bias(7);
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const config_t *conf = config_of_soc();
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const config_t *conf = config_of_soc();
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/* Set energy-performance preference */
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/* Set energy-performance preference */
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