• Neil Horman's avatar
    x86: Adjust irq remapping quirk for older revisions of 5500/5520 chipsets · 6f8a1b33
    Neil Horman authored
    Commit 03bbcb2e (iommu/vt-d: add quirk for broken interrupt
    remapping on 55XX chipsets) properly disables irq remapping on the
    5500/5520 chipsets that don't correctly perform that feature.
    
    However, when I wrote it, I followed the errata sheet linked in that
    commit too closely, and explicitly tied the activation of the quirk to
    revision 0x13 of the chip, under the assumption that earlier revisions
    were not in the field.  Recently a system was reported to be suffering
    from this remap bug and the quirk hadn't triggered, because the
    revision id register read at a lower value that 0x13, so the quirk
    test failed improperly.  Given this, it seems only prudent to adjust
    this quirk so that any revision less than 0x13 has the quirk asserted.
    
    [ tglx: Removed the 0x12 comparison of pci id 3405 as this is covered
        	by the <= 0x13 check already ]
    Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: x86@kernel.org
    Cc: stable@vger.kernel.org
    Link: http://lkml.kernel.org/r/1394649873-14913-1-git-send-email-nhorman@tuxdriver.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    6f8a1b33
early-quirks.c 12.6 KB