linux-kernel - [PATCH] arch/i386: Fix the AMD Elan SC520 PIT clock source to 1.18920MHz

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Date:   Thu, 7 Jul 2022 20:27:12 +0200
From:   Ognjen Jovandić <ognjen.jovandic.5@...nir.org>
To:     x86@...nel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: [PATCH] arch/i386: Fix the AMD Elan SC520 PIT clock source to
 1.18920MHz

From: Ognjen Jovandić <ognjen.jovandic.5@...nir.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@...nir.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 */