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From: "Shah, Nehal-bakulchandra" <nehal-bakulchandra.shah@amd.com>
To: Felipe Balbi <balbi@kernel.org>
Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, kun.liu2@amd.com,
	alexander.deucher@amd.com
Subject: Re: [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch
Date: Tue, 24 Aug 2021 21:32:32 +0530	[thread overview]
Message-ID: <1d9ecba4-d180-2193-66a3-3812759e1916@amd.com> (raw)
In-Reply-To: <87pmu36ypp.fsf@kernel.org>

Hi
On 8/24/2021 1:49 PM, Felipe Balbi wrote:
> 
> Nehal Bakulchandra Shah <Nehal-Bakulchandra.shah@amd.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

  reply	other threads:[~2021-08-24 16:03 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 18:44 [PATCH 0/2] Add DWC3 controller suppport for AMD's platforms Nehal Bakulchandra Shah
2021-08-23 18:44 ` [PATCH 1/2] usb: dwc3: pci: add support for AMD's newer generation platform Nehal Bakulchandra Shah
2021-08-24  8:19   ` Felipe Balbi
2021-08-23 18:44 ` [PATCH 2/2] usb: dwc3: pci add property to allow user space role switch Nehal Bakulchandra Shah
2021-08-24  8:19   ` Felipe Balbi
2021-08-24 16:02     ` Shah, Nehal-bakulchandra [this message]
2021-08-24 16:17       ` Felipe Balbi
2021-08-24 16:28         ` Shah, Nehal-bakulchandra
2021-08-24 16:54           ` Felipe Balbi

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