diff options
| -rw-r--r-- | src/soc/intel/elkhartlake/chip.h | 3 | ||||
| -rw-r--r-- | src/soc/intel/elkhartlake/cpu.c | 8 |
2 files changed, 11 insertions, 0 deletions
diff --git a/src/soc/intel/elkhartlake/chip.h b/src/soc/intel/elkhartlake/chip.h index d63844ffe7..94a2cdff78 100644 --- a/src/soc/intel/elkhartlake/chip.h +++ b/src/soc/intel/elkhartlake/chip.h @@ -454,6 +454,9 @@ struct soc_intel_elkhartlake_config { * 3600, 3733, 4000, 4200, 4267 and 0 for Auto. */ uint16_t max_dram_speed_mts; + + /* Disable L1 prefetcher */ + bool L1_prefetcher_disable; }; typedef struct soc_intel_elkhartlake_config config_t; diff --git a/src/soc/intel/elkhartlake/cpu.c b/src/soc/intel/elkhartlake/cpu.c index f4baa65fd9..8ba28c0159 100644 --- a/src/soc/intel/elkhartlake/cpu.c +++ b/src/soc/intel/elkhartlake/cpu.c @@ -67,6 +67,14 @@ static void configure_misc(void) msr.lo |= (1 << 0); /* Enable Bi-directional PROCHOT as an input */ msr.lo |= (1 << 23); /* Lock it */ wrmsr(MSR_POWER_CTL, msr); + + /* In some cases it is beneficial for the performance to disable the + L1 prefetcher as on Elkhart Lake it is set up a bit too aggressive. */ + if (conf->L1_prefetcher_disable) { + msr = rdmsr(MSR_PREFETCH_CTL); + msr.lo |= PREFETCH_L1_DISABLE; + wrmsr(MSR_PREFETCH_CTL, msr); + } } /* All CPUs including BSP will run the following function. */ |