On Tue, Oct 01, 2019 at 05:23:43PM +0000, Deucher, Alexander wrote:

> > ACP-PCI controller driver does not depends msi interrupts.
> > So removed msi related pci functions which have no use and does not impact
> > on existing functionality.

> In general, however, aren't MSIs preferred to legacy interrupts?

As I understand it.  Or at the very least I'm not aware of any situation
where they're harmful.  It'd be good to have a clear explanation of why
we're removing the support.

> Doesn't the driver have to opt into MSI support?  As such, won't
> removing this code effectively disable MSI support?

Yes.