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From 4042f73651a2f55642357c98c0476db2a01af830 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Fri, 28 Aug 2015 15:31:31 -0500
Subject: [PATCH 121/146] southbridge/amd/sb700: Fix drifting system clock
---
src/southbridge/amd/sb700/early_setup.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c
index 1f92a4e..f98e5c7 100644
--- a/src/southbridge/amd/sb700/early_setup.c
+++ b/src/southbridge/amd/sb700/early_setup.c
@@ -431,10 +431,10 @@ static void sb700_devices_por_init(void)
/* Configure HPET Counter CLK period */
byte = pci_read_config8(dev, 0x43);
- byte &= 0xF7; /* unhide HPET regs */
+ byte &= 0xF7; /* Unhide HPET regs */
pci_write_config8(dev, 0x43, byte);
- pci_write_config32(dev, 0x34, 0x0429B17E ); /* Counter CLK period */
- byte |= 0x08; /* hide HPET regs */
+ pci_write_config32(dev, 0x34, 0xb0); /* HPET_CNTRL = 0xb0 */
+ byte |= 0x08; /* Hide HPET regs */
pci_write_config8(dev, 0x43, byte);
/* Features Enable */
@@ -669,6 +669,14 @@ static void sb700_pmio_por_init(void)
byte = pmio_read(0xbb);
byte |= 0xc0;
pmio_write(0xbb, byte);
+
+#if CONFIG_SOUTHBRIDGE_AMD_SUBTYPE_SP5100
+ /* Work around system clock drift issues */
+ byte = pmio_read(0xd4);
+ byte |= 0x1 << 6; /* Enable alternate 14MHz clock source */
+ byte |= 0x1 << 7; /* Disable 25MHz oscillator buffer */
+ pmio_write(0xd4, byte);
+#endif
}
/*
--
1.7.9.5
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