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authorShaohua Li <shaohua.li@intel.com>2009-11-16 09:56:05 +0800
committerJeff Garzik <jgarzik@redhat.com>2009-12-03 02:46:34 -0500
commit1b677afda44f7882b7e257d6f025d006ec5d14f9 (patch)
treeaac59bb9fdb5e39b2f31c97be3bf92591a005059 /MAINTAINERS
parentdae77214fa71898b84514e43721fb7bf260b026a (diff)
ahci: disable SNotification capability for ich8
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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