[tip:x86/timers] x86, hpet: Add reference to chipset erratum documentation for disable-hpet-msi-quirk

From: tip-bot for Andreas Herrmann
Date: Mon May 17 2010 - 13:07:18 EST


Commit-ID: fec84e330719c20d2146c8dbdc9ff50b3a1d7039
Gitweb: http://git.kernel.org/tip/fec84e330719c20d2146c8dbdc9ff50b3a1d7039
Author: Andreas Herrmann <andreas.herrmann3@xxxxxxx>
AuthorDate: Mon, 17 May 2010 18:43:24 +0200
Committer: H. Peter Anvin <hpa@xxxxxxxxx>
CommitDate: Mon, 17 May 2010 10:04:43 -0700

x86, hpet: Add reference to chipset erratum documentation for disable-hpet-msi-quirk

(At the moment the "SB700 Family Product Errata" document is available
at http://support.amd.com/us/Embedded_TechDocs/46837.pdf)

Signed-off-by: Andreas Herrmann <andreas.herrmann3@xxxxxxx>
LKML-Reference: <20100517164324.GB10254@xxxxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
---
arch/x86/kernel/quirks.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index cd2c336..e72d3fc 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -495,6 +495,9 @@ void force_hpet_resume(void)
/*
* HPET MSI on some boards (ATI SB700/SB800) has side effect on
* floppy DMA. Disable HPET MSI on such platforms.
+ * See erratum #27 (Misinterpreted MSI Requests May Result in
+ * Corrupted LPC DMA Data) in AMD Publication #46837,
+ * "SB700 Family Product Errata", Rev. 1.0, March 2010.
*
* Also force the read back of the CMP register in hpet_next_event()
* to work around the problem that the CMP register write seems to be
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