diff --git a/include/asm-generic/delay.h b/include/asm-generic/delay.h
index a8cee41cc51b..76cf237b6e4c 100644
--- a/include/asm-generic/delay.h
+++ b/include/asm-generic/delay.h
@@ -2,6 +2,9 @@
 #ifndef __ASM_GENERIC_DELAY_H
 #define __ASM_GENERIC_DELAY_H
 
+#include <linux/math.h>
+#include <vdso/time64.h>
+
 /* Undefined functions to get compile-time errors */
 extern void __bad_udelay(void);
 extern void __bad_ndelay(void);
@@ -12,13 +15,18 @@ extern void __const_udelay(unsigned long xloops);
 extern void __delay(unsigned long loops);
 
 /*
- * Implementation details:
- *
- * * The weird n/20000 thing suppresses a "comparison is always false due to
- *   limited range of data type" warning with non-const 8-bit arguments.
- * * 0x10c7 is 2**32 / 1000000 (rounded up) -> udelay
- * * 0x5 is 2**32 / 1000000000 (rounded up) -> ndelay
+ * The microseconds/nanosecond delay multiplicators are used to convert a
+ * constant microseconds/nanoseconds value to a value which can be used by the
+ * architectures specific implementation to transform it into loops.
  */
+#define UDELAY_CONST_MULT	((unsigned long)DIV_ROUND_UP(1ULL << 32, USEC_PER_SEC))
+#define NDELAY_CONST_MULT	((unsigned long)DIV_ROUND_UP(1ULL << 32, NSEC_PER_SEC))
+
+/*
+ * The maximum constant udelay/ndelay value picked out of thin air to prevent
+ * too long constant udelays/ndelays.
+ */
+#define DELAY_CONST_MAX   20000
 
 /**
  * udelay - Inserting a delay based on microseconds with busy waiting
@@ -45,17 +53,17 @@ extern void __delay(unsigned long loops);
  * #. cache behaviour affecting the time it takes to execute the loop function.
  * #. CPU clock rate changes.
  */
-#define udelay(n)							\
-	({								\
-		if (__builtin_constant_p(n)) {				\
-			if ((n) / 20000 >= 1)				\
-				 __bad_udelay();			\
-			else						\
-				__const_udelay((n) * 0x10c7ul);		\
-		} else {						\
-			__udelay(n);					\
-		}							\
-	})
+static __always_inline void udelay(unsigned long usec)
+{
+	if (__builtin_constant_p(usec)) {
+		if (usec >= DELAY_CONST_MAX)
+			__bad_udelay();
+		else
+			__const_udelay(usec * UDELAY_CONST_MULT);
+	} else {
+		__udelay(usec);
+	}
+}
 
 /**
  * ndelay - Inserting a delay based on nanoseconds with busy waiting
@@ -63,16 +71,17 @@ extern void __delay(unsigned long loops);
  *
  * See udelay() for basic information about ndelay() and it's variants.
  */
-#define ndelay(n)							\
-	({								\
-		if (__builtin_constant_p(n)) {				\
-			if ((n) / 20000 >= 1)				\
-				__bad_ndelay();				\
-			else						\
-				__const_udelay((n) * 5ul);		\
-		} else {						\
-			__ndelay(n);					\
-		}							\
-	})
+static __always_inline void ndelay(unsigned long nsec)
+{
+	if (__builtin_constant_p(nsec)) {
+		if (nsec >= DELAY_CONST_MAX)
+			__bad_udelay();
+		else
+			__const_udelay(nsec * NDELAY_CONST_MULT);
+	} else {
+		__udelay(nsec);
+	}
+}
+#define ndelay(x) ndelay(x)
 
 #endif /* __ASM_GENERIC_DELAY_H */