aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/ata_piix.c
diff options
context:
space:
mode:
authorShaohua Li <shaohua.li@intel.com>2009-11-16 09:56:05 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-28 15:02:15 -0800
commit3de08a120ab3ac85bfc31e03b5d2dc2758a3bd21 (patch)
tree402e73b80587bd13130b833386685972f797b973 /drivers/ata/ata_piix.c
parentc817c1975bd7d46bc8af3ccacde8d86353bed02a (diff)
ahci: disable SNotification capability for ich8
commit 1b677afda44f7882b7e257d6f025d006ec5d14f9 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/ata/ata_piix.c')
0 files changed, 0 insertions, 0 deletions