From: ori@eigenstate.org
To: 9front@9front.org
Subject: Re: [9front] [PATCH] usbxhci: wait for reset to complete before continuing initialization
Date: Wed, 23 Nov 2022 22:20:01 -0500 [thread overview]
Message-ID: <BC535B5AF188DF4189092F30028079A4@eigenstate.org> (raw)
In-Reply-To: <636f05eb.170a0220.934c8.4131@mx.google.com>
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.
prev parent reply other threads:[~2022-11-24 3:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-12 1:11 Michael Forney
2022-11-24 3:20 ` ori [this message]
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