* [PATCH] arch/i386: Fix the AMD Elan SC520 PIT clock source to 1.18920MHz
@ 2022-07-07 18:27 Ognjen Jovandić
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From: Ognjen Jovandić @ 2022-07-07 18:27 UTC (permalink / raw)
To: x86; +Cc: tglx, mingo, bp, dave.hansen, linux-kernel
From: Ognjen Jovandić <ognjen.jovandic.5@pionir.org>
x86/i386: Fix the AMD Elan SC520 PIT clock source to 1.18920MHz, which deviates from
standard PC/AT clones.
Signed-off-by: Ognjen Jovandić <ognjen.jovandic.5@pionir.org>
---
Changed PIT_TICK_RATE to 1189200ul which i found in Élan™SC520
Microcontroller User’s Manual Chapter 5 CLOCK GENERATION AND CONTROL.
Found problem while trying to port OpeWrt 21.04 to Soekris net4501.
--- a/arch/x86/include/asm/timex.h
+++ b/arch/x86/include/asm/timex.h
@@ -5,9 +5,19 @@
#include <asm/processor.h>
#include <asm/tsc.h>
+
+#ifdef CONFIG_MELAN
+
+#define CLOCK_TICK_RATE 1189200ul
+
+#else
+
/* Assume we use the PIT time source for the clock tick */
#define CLOCK_TICK_RATE PIT_TICK_RATE
+#endif
+
+
#define ARCH_HAS_READ_CURRENT_TIMER
#endif /* _ASM_X86_TIMEX_H */
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2022-07-07 18:27 [PATCH] arch/i386: Fix the AMD Elan SC520 PIT clock source to 1.18920MHz Ognjen Jovandić
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