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Re: [PATCH v2 2/9] xue: reset XHCI ports when initializing dbc
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 13 Jul 2022 09:19:08 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 13 Jul 2022 07:19:22 +0000
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On 06.07.2022 17:32, Marek Marczykowski-Górecki wrote:
> Reset ports, to force host system to re-enumerate devices. Otheriwse it
> will require the cable to be re-plugged, or will wait in the
> "configuring" state indefinitely.
>
> Trick and code copied from Linux:
> drivers/usb/early/xhci-dbc.c:xdbc_start()->xdbc_reset_debug_port()
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Of course it would be nice to get an actual R-b from someone knowledgable
(likely going to apply to subsequent patches as well).
Jan
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