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ahci: work around ATI SB600 h/w quirk
authorJeff Garzik <jeff@garzik.org>
Thu, 28 Feb 2008 20:43:48 +0000 (15:43 -0500)
committerJeff Garzik <jeff@garzik.org>
Wed, 5 Mar 2008 12:53:06 +0000 (07:53 -0500)
commita878539ef994787c447a98c2e3ba0fe3dad984ec
tree3c2b16121143c4dad805b048b2cee5d4c410384atree | snapshot
parent6ddd68615ae9b21096545d7d6ab0f04113ae8b42commit | diff
ahci: work around ATI SB600 h/w quirk

This addresses the recent ATI SB600 errata, where the hardware does
not like 256-length PRD entries during FPDMA (aka NCQ).

It hurts performance on SB600, but it is more important to get a
correct patch eliminating the data corruption/lockups, and then later
on tune for performance.

We simply limit each command to a maximum of 255 sectors, on SB600.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
drivers/ata/ahci.c diff | blob | history
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