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-rw-r--r--include/asm-arm/delay.h12
1 files changed, 7 insertions, 5 deletions
diff --git a/include/asm-arm/delay.h b/include/asm-arm/delay.h
index 1704360e9699..b2deda181549 100644
--- a/include/asm-arm/delay.h
+++ b/include/asm-arm/delay.h
@@ -6,6 +6,8 @@
#ifndef __ASM_ARM_DELAY_H
#define __ASM_ARM_DELAY_H
+#include <asm/param.h> /* HZ */
+
extern void __delay(int loops);
/*
@@ -13,7 +15,7 @@ extern void __delay(int loops);
* it, it means that you're calling udelay() with an out of range value.
*
* With currently imposed limits, this means that we support a max delay
- * of 2000us and 671 bogomips
+ * of 2000us. Further limits: HZ<=1000 and bogomips<=3355
*/
extern void __bad_udelay(void);
@@ -32,10 +34,10 @@ extern void __const_udelay(unsigned long);
#define MAX_UDELAY_MS 2
-#define udelay(n) \
- (__builtin_constant_p(n) ? \
- ((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() : \
- __const_udelay((n) * 0x68dbul)) : \
+#define udelay(n) \
+ (__builtin_constant_p(n) ? \
+ ((n) > (MAX_UDELAY_MS * 1000) ? __bad_udelay() : \
+ __const_udelay((n) * ((2199023U*HZ)>>11))) : \
__udelay(n))
#endif /* defined(_ARM_DELAY_H) */
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