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authorManuel Lauss <manuel.lauss@googlemail.com>2009-08-27 19:21:18 +0200
committerRalf Baechle <ralf@linux-mips.org>2009-09-17 20:07:51 +0200
commita7bcb1ae6094db78b077ae17e92c69de7643014f (patch)
treeb59e32e51c84bcc69a9458fa8b7bc8d11286dea0
parentf7557dc8215a2e7eb22da583d03e1aef72c58b3c (diff)
MIPS: Alchemy: override loops_per_jiffy detection
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>
-rw-r--r--arch/mips/alchemy/common/setup.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c
index 3f036b3d400..6184baa5678 100644
--- a/arch/mips/alchemy/common/setup.c
+++ b/arch/mips/alchemy/common/setup.c
@@ -27,6 +27,7 @@
#include <linux/init.h>
#include <linux/ioport.h>
+#include <linux/jiffies.h>
#include <linux/module.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(),
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_halt = au1000_halt;
pm_power_off = au1000_power_off;