soc/intel/cannonlake: Add chip config to override CPU flex ratio
This patch provides options to override descriptor default CPU flex ratio from coreboot code. cpu_ratio_override to provide the required CPU ratio. Note: Don't override the flex ratio if cpu_ratio is 0. BUG=b:142264107 TEST=Without override flex_ratio is 0 and verified booting to OS after overriding with flex_ratio value 5. Change-Id: Ib01650f52f3d402f669e7e7f5b28a648b86f08ec Signed-off-by: Subrata Banik <subrata.banik@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36864 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
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@ -424,6 +424,19 @@ struct soc_intel_cannonlake_config {
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* Bit 0: MISCCFG_GPDLCGEN
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*/
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uint8_t gpio_pm[TOTAL_GPIO_COMM];
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/*
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* Override CPU flex ratio value:
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* CPU ratio value controls the maximum processor non-turbo ratio.
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* Valid Range 0 to 63.
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*
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* In general descriptor provides option to set default cpu flex ratio.
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* Default cpu flex ratio is 0 ensures booting with non-turbo max frequency.
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* Thats the reason FSP skips cpu_ratio override if cpu_ratio is 0.
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*
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* Only override CPU flex ratio if don't want to boot with non-turbo max.
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*/
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uint8_t cpu_ratio_override;
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};
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typedef struct soc_intel_cannonlake_config config_t;
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@ -74,10 +74,14 @@ static void soc_memory_init_params(FSP_M_CONFIG *m_cfg, const config_t *config)
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m_cfg->SkipMpInit = !CONFIG_USE_INTEL_FSP_MP_INIT;
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#endif
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/* Set CpuRatio to match existing MSR value */
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msr_t flex_ratio;
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flex_ratio = rdmsr(MSR_FLEX_RATIO);
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m_cfg->CpuRatio = (flex_ratio.lo >> 8) & 0xff;
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if (config->cpu_ratio_override) {
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m_cfg->CpuRatio = config->cpu_ratio_override;
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} else {
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/* Set CpuRatio to match existing MSR value */
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msr_t flex_ratio;
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flex_ratio = rdmsr(MSR_FLEX_RATIO);
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m_cfg->CpuRatio = (flex_ratio.lo >> 8) & 0xff;
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}
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/* If ISH is enabled, enable ISH elements */
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if (!dev)
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