linux-kernel - Re: [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87czq27r5w.fsf@kernel.org>
Date:   Tue, 24 Aug 2021 19:17:46 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     "Shah, Nehal-bakulchandra" <nehal-bakulchandra.shah@....com>
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, kun.liu2@....com,
        alexander.deucher@....com
Subject: Re: [PATCH 2/2] usb: dwc3: pci add property to allow user space
 role switch


"Shah, Nehal-bakulchandra" <nehal-bakulchandra.shah@....com> writes:

> Hi
> On 8/24/2021 1:49 PM, Felipe Balbi wrote:
>> Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@....com> writes:
>> 
>>> For AMD platform there is a requirement to enable user space role
>>> switch from host to device and device to host by means of running
>>> following commands.
>>>
>>> HOST:   echo host > /sys/class/usb_role/dwc3.0.auto-role-switch/role
>>> DEVICE: echo device > /sys/class/usb_role/dwc3.0.auto-role-switch/role
>> A more important question that needs to be answered: why?
>> 
> Our customer platform is not completely capable of OTG i.e with type C
> controller it does not have PD to support role switching. Hence, they 
> have script which triggers the role switch based on ACPI/EC interrupt.

sounds like some generalized version of this text should be added to
commit log.

-- 
balbi