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MIPS: Netlogic: use preset loops per jiffy

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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 <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4791/
Signed-off-by: John Crispin <blogic@openwrt.org>
This commit is contained in:
Jayachandran C 2013-01-14 15:12:00 +00:00 committed by John Crispin
parent 5a4cbe3811
commit 37a7059bc4
1 changed files with 4 additions and 0 deletions
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4
arch/mips/netlogic/common/time.c
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@ -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);
}