[PATCH] arm: remove unused code in delay.S
Steve Chen
schen at mvista.com
Tue Sep 15 15:44:35 EDT 2009
Felipe,
Here is the updated patch. If you don't mind add your signed-off, I can
submit the patch.
Regards,
Steve
Document #if 0 code block in delay.S and make it selectable for compile.
Signed-off-by: Steve Chen <schen at mvista.com>
---
arch/arm/Kconfig | 8 ++++++++
arch/arm/lib/delay.S | 2 +-
2 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index aef63c8..ca8d535 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -813,6 +813,14 @@ config ARM_ERRATA_460075
ACTLR register. Note that setting specific bits in the ACTLR
register
may not be available in non-secure mode.
+config OLD_CPU_DELAY
+ depends on CPU_32v3 || CPU_32v4 || CPU_32v4T
+ bool "Accurate delays"
+ def_bool n
+ help
+ Enable if observing longer than expected delays and need more
+ accuracy. This only applies to older CPUs.
+
endmenu
source "arch/arm/common/Kconfig"
diff --git a/arch/arm/lib/delay.S b/arch/arm/lib/delay.S
index 8d6a876..67e679b 100644
--- a/arch/arm/lib/delay.S
+++ b/arch/arm/lib/delay.S
@@ -42,7 +42,7 @@ ENTRY(__const_udelay) @ 0 <= r0 <= 0x7fffff06
@ Delay routine
ENTRY(__delay)
subs r0, r0, #1
-#if 0
+#ifdef CONFIG_OLD_CPU_DELAY
movls pc, lr
subs r0, r0, #1
movls pc, lr
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