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From: Mathias Nyman <>
To: Bernhard Gebetsberger <>
Cc: Mathias Nyman <>,
	Greg Kroah-Hartman <>,,
Subject: Re: [PATCH] xhci: Don't use soft retry if slot id > 0
Date: Mon, 14 Oct 2019 11:06:40 +0300
Message-ID: <> (raw)
In-Reply-To: <>

On 13.10.2019 3.33, Bernhard Gebetsberger wrote:
> According to the xhci specification(chapter soft retry
> shouldn't be used if the slot id is higher than 0. Currently some usb
> devices break on some systems because soft retry is being used when
> there is a transaction error, without checking the slot id.
That is not correct

Specs say that soft retry should not be used if we are dealing with a
FS/LS device behind a HS hub, this can be checked from the "TT Hub Slot ID"
field in the slot context, which we do.

In xhci all devices have a slot id, so this change would prevent
soft retry almost completely.

"Soft Retry attempts shall not be performed if the device is behind a
TT in a HS Hub (i.e. TT Hub Slot ID > ‘0’)."


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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-13  0:33 Bernhard Gebetsberger
2019-10-14  8:06 ` Mathias Nyman [this message]
2019-10-14  9:17   ` Bernhard Gebetsberger

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