ahci: disable SNotification capability for ich8

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I obseved there is a sata_async_notification() for every ahci
interrupt. But the async notification does nothing (this is hard
disk drive and no pmp). This cause cpu wastes some time on sntf
register access.

It appears ICH AHCI doesn't support SNotification register, but the
controller reports it does. After quirking it, the async notification
disappears.

PS. it appears all ICH don't support SNotification register from ICH
manual, don't know if we need quirk all ICH. I don't have machines
with all kinds of ICH.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

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This commit is contained in:

Shaohua Li 2009-11-16 09:56:05 +08:00 • committed by Jeff Garzik

parent dae77214fa

commit 1b677afda4

1 changed files with 18 additions and 2 deletions

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drivers/ata/ahci.c

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