[PATCH v3] powerpc/xics: Work around limitations of OPAL XICS priority handling

[Benjamin Herrenschmidt]

On Sat, 2017-03-04 at 23:03 +1100, Michael Ellerman wrote:
> +
> +       /* Allow "sufficient" time to drop any inflight IRQ's */
> +       mdelay(1);
> +

According to the HW guys, that should be 5ms in case the powerbus is
really really busy.

Cheers,
Ben.