linux-kernel - [PATCH] x86, hpet: Add reference to chipset erratum documentation for disable-hpet-msi-quirk

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Message-ID: <20100517164324.GB10254@alberich.amd.com>
Date:	Mon, 17 May 2010 18:43:24 +0200
From:	Andreas Herrmann <herrmann.der.user@...glemail.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] x86, hpet: Add reference to chipset erratum documentation
 for disable-hpet-msi-quirk

From: Andreas Herrmann <andreas.herrmann3@....com>

(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@....com>
---
 arch/x86/kernel/quirks.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Linus recommended to add a pointer to that erratum to the source.  See

  http://marc.info/?i=alpine.LFD.2.00.1005170811400.4195@i5.linux-foundation.org

Please apply.


Thanks,

Andreas


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
-- 
1.6.4.4

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