Return the saved TSC frequency in get_tbclk_mhz().
Signed-off-by: Bin Meng bmeng.cn@gmail.com --- arch/x86/include/asm/global_data.h | 1 + arch/x86/lib/tsc_timer.c | 4 ++++ 2 files changed, 5 insertions(+)
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index 721e7dc..7f22336 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -21,6 +21,7 @@ struct arch_global_data { uint64_t tsc_base; /* Initial value returned by rdtsc() */ uint32_t tsc_base_kclocks; /* Initial tsc as a kclocks value */ uint32_t tsc_prev; /* For show_boot_progress() */ + uint32_t tsc_mhz; /* TSC frequency in MHz */ void *new_fdt; /* Relocated FDT */ };
diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c index 8a0abde..b5f0458 100644 --- a/arch/x86/lib/tsc_timer.c +++ b/arch/x86/lib/tsc_timer.c @@ -293,6 +293,9 @@ unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void) { unsigned long fast_calibrate;
+ if (gd->arch.tsc_mhz) + return gd->arch.tsc_mhz; + fast_calibrate = try_msr_calibrate_tsc(); if (fast_calibrate) return fast_calibrate; @@ -301,6 +304,7 @@ unsigned __attribute__((no_instrument_function)) long get_tbclk_mhz(void) if (!fast_calibrate) panic("TSC frequency is ZERO");
+ gd->arch.tsc_mhz = fast_calibrate; return fast_calibrate; }