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

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Date:   Tue, 24 Aug 2021 21:32:32 +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

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.

Regards
Nehal Shah