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Subject: Re: [9front] [PATCH] usbxhci: wait for reset to complete before continuing initialization
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Quoth Michael Forney <mforney@mforney.org>:
> 
> The xhci spec says that the HCRST bit is cleared once the reset is
> complete, and that no operational or runtime registers shall be
> written while the bit is set.
> 
> Waiting for the reset to complete fixes initialization of some host
> controllers, such as the ASMedia ASM1142, which otherwise enter an
> endless init-recover loop.
> 
> Also, add a comment about the reason for the 1ms delay. This appears
> to work around a system hang bug in intel chipsets through the 400
> series (see errata 15 in [0]).
> 

looks good to me, doesn't cause any problemms for my systems.