intel/iommu: force writebuffer-flush quirk on Gen 4 Chipsets
We already have the quirk entry for the mobile platform, but also reports on some desktop versions. So be paranoid and set it everywhere. References: http://www.mail-archive.com/dri-devel@lists.freedesktop.org/msg33138.html Cc: stable@vger.kernel.org Cc: David Woodhouse <dwmw2@infradead.org> Cc: "Sankaran, Rajesh" <rajesh.sankaran@intel.com> Reported-and-tested-by: NMihai Moldovan <ionic@ionic.de> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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