diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/intel/apollolake/Kconfig | 12 | ||||
| -rw-r--r-- | src/soc/intel/apollolake/cpu.c | 3 |
2 files changed, 15 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig index 0c0fca9475..c9b17b047d 100644 --- a/src/soc/intel/apollolake/Kconfig +++ b/src/soc/intel/apollolake/Kconfig @@ -370,12 +370,24 @@ config CPU_BCLK_MHZ config APL_SKIP_SET_POWER_LIMITS bool + depends on !APL_SET_MIN_CLOCK_RATIO default n help Some Apollo Lake mainboards do not need the Running Average Power Limits (RAPL) algorithm for a constant power management. Set this config option to skip the RAPL configuration. +config APL_SET_MIN_CLOCK_RATIO + bool + depends on !APL_SKIP_SET_POWER_LIMITS + default n + help + If the power budget of the mainboard is limited, it can be useful to + limit the CPU power dissipation at the cost of performance by setting + the lowest possible CPU clock. Enable this option if you need smallest + possible CPU clock. This setting can be overruled by the OS if it has an + p-state driver which can adjust the clock to its need. + # M and N divisor values for clock frequency configuration. # These values get us a 1.836 MHz clock (ideally we want 1.843 MHz) config SOC_INTEL_COMMON_LPSS_UART_CLK_M_VAL diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index bf5beacbb1..bcec28e514 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -92,6 +92,9 @@ void soc_core_init(struct device *cpu) if (IS_ENABLED(CONFIG_APL_SKIP_SET_POWER_LIMITS)) { cpu_set_p_state_to_max_non_turbo_ratio(); cpu_disable_eist(); + } else if (IS_ENABLED(CONFIG_APL_SET_MIN_CLOCK_RATIO)) { + cpu_set_p_state_to_min_clock_ratio(); + cpu_disable_eist(); } } |