ata_piix: ICH7 does not support correct MWDMA timings
See Errata documentation. The recommended workaround is to use PIO4 instead which will we automatically do by flagging this mode not available. Signed-off-by: Alan Cox <alan.cox@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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