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

[tip-bot for Andreas Herrmann]

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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