[MIPS] lib_mips/time.c: Fix udelay

What we have to do is just to wait for given micro-seconds. No need to
take into account current time, get_timer and CFG_HZ.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>

diff --git a/lib_mips/time.c b/lib_mips/time.c
index 2c696b709d298d30bc9198aa4ea3d41e6bd01213..fe365303b4d7380f535aa44bac244debfe5a44b9 100644 (file)
--- a/lib_mips/time.c
+++ b/lib_mips/time.c
@@ -51,13 +51,12 @@ void set_timer(ulong t)
        write_c0_count(t);
 }
 
-void udelay (unsigned long usec)
+void udelay(unsigned long usec)
 {
-       ulong tmo;
-       ulong start = get_timer(0);
+       unsigned int tmo;
 
-       tmo = usec * (CFG_HZ / 1000000);
-       while ((ulong)((read_c0_count() - start)) < tmo)
+       tmo = read_c0_count() + (usec * (CFG_MIPS_TIMER_FREQ / 1000000));
+       while ((tmo - read_c0_count()) < 0x7fffffff)
                /*NOP*/;
 }