The patch titled
arm: fix IXP4xx CLOCK_TICK_RATE
has been added to the -mm tree. Its filename is
arm-fix-ixp4xx-clock_tick_rate.patch
Patches currently in -mm which might be from [EMAIL PROTECTED] are
arm-fix-ixp4xx-clock_tick_rate.patch
From: Deepak Saxena <[EMAIL PROTECTED]>
[RMK is out for the week so sending this direct as it should go into 2.6.13]
As pointed out in the following thread, the CLOCK_TICK_RATE setting for
IXP4xx is incorrect b/c the HW ignores the lowest 2 bits of the LATCH
value.
http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2005-August/030950.html
Tnx to George Anziger and Egil Hjelmeland for finding the issue.
Signed-off-by: Deepak Saxena <[EMAIL PROTECTED]>
Cc: Russell King <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
include/asm-arm/arch-ixp4xx/timex.h | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff -puN include/asm-arm/arch-ixp4xx/timex.h~arm-fix-ixp4xx-clock_tick_rate
include/asm-arm/arch-ixp4xx/timex.h
--- devel/include/asm-arm/arch-ixp4xx/timex.h~arm-fix-ixp4xx-clock_tick_rate
2005-08-26 12:48:16.000000000 -0700
+++ devel-akpm/include/asm-arm/arch-ixp4xx/timex.h 2005-08-26
12:48:16.000000000 -0700
@@ -7,7 +7,9 @@
/*
* We use IXP425 General purpose timer for our timer needs, it runs at
- * 66.66... MHz
+ * 66.66... MHz. We do a convulted calculation of CLOCK_TICK_RATE b/c the
+ * timer register ignores the bottom 2 bits of the LATCH value.
*/
-#define CLOCK_TICK_RATE (66666666)
+#define FREQ 66666666
+#define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)
_
-
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