diff options
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 35e7ae8967f3..381bb4077563 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -966,9 +966,23 @@ static inline void __cpu_enable_hw_dbm(void) isb(); } +static bool cpu_has_broken_dbm(void) +{ + /* List of CPUs which have broken DBM support. */ + static const struct midr_range cpus[] = { +#ifdef CONFIG_ARM64_ERRATUM_1024718 + MIDR_RANGE(MIDR_CORTEX_A55, 0, 0, 1, 0), // A55 r0p0 -r1p0 +#endif + {}, + }; + + return is_midr_in_range_list(read_cpuid_id(), cpus); +} + static bool cpu_can_use_dbm(const struct arm64_cpu_capabilities *cap) { - return has_cpuid_feature(cap, SCOPE_LOCAL_CPU); + return has_cpuid_feature(cap, SCOPE_LOCAL_CPU) && + !cpu_has_broken_dbm(); } static void cpu_enable_hw_dbm(struct arm64_cpu_capabilities const *cap) |