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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.

      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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