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

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(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@amd.com>
LKML-Reference: <20100517164324.GB10254@alberich.amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Andreas Herrmann 2010-05-17 18:43:24 +02:00 committed by H. Peter Anvin
parent 30a564be9d
commit fec84e3307
1 changed files with 3 additions and 0 deletions
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arch/x86/kernel/quirks.c
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@ -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