ata_piix: make DVD Drive recognisable on systems with Intel Sandybridge chipsets(v2)
This quirk patch fixes one kind of bug inside some Intel Sandybridge chipsets, see reports from https://bugzilla.kernel.org/show_bug.cgi?id=40592. Many guys also have reported the problem before: https://bugs.launchpad.net/bugs/737388 https://bugs.launchpad.net/bugs/794642 https://bugs.launchpad.net/bugs/782389 ...... With help from Tejun, the problem is found to be caused by 32bit PIO mode, so introduce the quirk patch to disable 32bit PIO on SATA piix for some Sandybridge CPT chipsets. Seth also tested the patch on all five affected chipsets (pci device ID: 0x1c00, 0x1c01, 0x1d00, 0x1e00, 0x1e01), and found the patch does fix the problem. Tested-by:Heasley, Seth <seth.heasley@intel.com> Cc: Alan Cox <alan@linux.intel.com> Signed-off-by:
Ming Lei <ming.lei@canonical.com> Acked-by:
Tejun Heo <htejun@gmail.com> Signed-off-by:
Jeff Garzik <jgarzik@redhat.com> Cc: stable@kernel.org
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