On Fri, Aug 16, 2013 at 8:43 AM, Alex Williamson <alex.william...@redhat.com> wrote: > This is intended to add VGA arbiter support for Intel HD graphics on > Core processors. The old GMCH registers no longer exist, so even > though it appears that i915 participates in VGA arbitration, it doesn't > work. On Intel HD graphics we already attempt to disable VGA regions > of the device. This makes registering as a VGA client unnecessary since > we don't intend to operate differently depending on how many VGA devices > are present. We can disable VGA memory regions by clearing a memory > enable bit in the VGA MSR. That only leaves VGA IO, which we update > the VGA arbiter to know that we don't participate in VGA memory > arbitration. We also add a hook on unload to re-enable memory and > reinstate VGA memory arbitration.
I would think there is still a VGA disable bit on the Intel device somewhere, we'd just need Intel to look in the docs and find it. A bit that can nuke both i/o and cmd regs. Dave. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
