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

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Message-ID: <05c17f61-30db-6d10-d980-d3973dedfa5e@amd.com>
Date:   Tue, 24 Aug 2021 21:58:58 +0530
From:   "Shah, Nehal-bakulchandra" <nehal-bakulchandra.shah@....com>
To:     Felipe Balbi <balbi@...nel.org>
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

On 8/24/2021 9:47 PM, Felipe Balbi wrote:
> 
> "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.
> 
Sure i will resubmit this patch with this description should be ok?

Nehal