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 19:54:34 +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


Hi,

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

yup, sounds good. Thank you


-- 
balbi