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MIPS: Alchemy: override loops_per_jiffy detection

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loops_per_jiffy depends on coreclk speed;  preset it instead of
letting the kernel waste precious microseconds trying to approximate it.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss 2009-08-27 19:21:18 +02:00 committed by Ralf Baechle
parent f7557dc821
commit a7bcb1ae60
1 changed files with 4 additions and 0 deletions
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4
arch/mips/alchemy/common/setup.c
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@ -27,6 +27,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/ioport.h> #include <linux/ioport.h>
#include <linux/jiffies.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/pm.h> #include <linux/pm.h>
@ -53,6 +54,9 @@ void __init plat_mem_setup(void)
printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(), printk(KERN_INFO "(PRId %08x) @ %lu.%02lu MHz\n", read_c0_prid(),
est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000); est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000);
/* this is faster than wasting cycles trying to approximate it */
preset_lpj = (est_freq >> 1) / HZ;
_machine_restart = au1000_restart; _machine_restart = au1000_restart;
_machine_halt = au1000_halt; _machine_halt = au1000_halt;
pm_power_off = au1000_power_off; pm_power_off = au1000_power_off;