From: Jayachandran C Date: Mon, 14 Jan 2013 15:12:00 +0000 (+0000) Subject: MIPS: Netlogic: use preset loops per jiffy X-Git-Tag: v3.9-rc1~26^2~1^2~62 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=37a7059bc4228613867645be50120aff17a162a1;p=~emulex%2Finfiniband.git MIPS: Netlogic: use preset loops per jiffy Doing calibrate delay on a hardware thread will be inaccurate since it depends on the load on other threads in the core. It will also slow down the boot process when done for 128 hardware threads. Switch to a pre-computed loops per jiffy based on the core frequency. The value is computed based on the core frequency and roughly matches the value calculated by calibrate_delay(). Signed-off-by: Jayachandran C Patchwork: http://patchwork.linux-mips.org/patch/4791/ Signed-off-by: John Crispin --- diff --git a/arch/mips/netlogic/common/time.c b/arch/mips/netlogic/common/time.c index 20f89bc0507..5c56555380b 100644 --- a/arch/mips/netlogic/common/time.c +++ b/arch/mips/netlogic/common/time.c @@ -98,6 +98,10 @@ void __init plat_time_init(void) { nlm_init_pic_timer(); mips_hpt_frequency = nlm_get_cpu_frequency(); + if (current_cpu_type() == CPU_XLR) + preset_lpj = mips_hpt_frequency / (3 * HZ); + else + preset_lpj = mips_hpt_frequency / (2 * HZ); pr_info("MIPS counter frequency [%ld]\n", (unsigned long)mips_hpt_frequency); }