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From:   Felipe Balbi <felipe.balbi@linux.intel.com>
To:     Roger Quadros <rogerq@ti.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Pawel Laszczak <pawell@cadence.com>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "jbergsagel\@ti.com" <jbergsagel@ti.com>,
        "nsekhar\@ti.com" <nsekhar@ti.com>, "nm\@ti.com" <nm@ti.com>,
        Suresh Punnoose <sureshp@cadence.com>,
        Jayshri Dajiram Pawar <jpawar@cadence.com>,
        Rahul Kumar <kurahul@cadence.com>,
        Anil Joy Varughese <aniljoy@cadence.com>
Subject: Re: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver
In-Reply-To: <d3bba104-9a85-df8d-c62d-6acb8913c3fe@ti.com>
References: <1563733939-21214-1-git-send-email-pawell@cadence.com> <1563733939-21214-6-git-send-email-pawell@cadence.com> <88742d5b-ee10-cf4e-6724-58e7bdd19cb9@ti.com> <BYAPR07MB47090BCA728600F0C2F4E129DDD00@BYAPR07MB4709.namprd07.prod.outlook.com> <1e557bcf-2d50-f600-0e81-1f9fba5499a1@ti.com> <BYAPR07MB4709F306EC472B7AABEB7D4CDDD30@BYAPR07MB4709.namprd07.prod.outlook.com> <20190812103147.GA4691@kuha.fi.intel.com> <d3bba104-9a85-df8d-c62d-6acb8913c3fe@ti.com>
Date:   Mon, 12 Aug 2019 15:46:25 +0300
Message-ID: <874l2mtuu6.fsf@gmail.com>
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Hi,

Roger Quadros <rogerq@ti.com> writes:
>> The sysfs file we expose from the class for the role switches is
>> primarily meant for supporting proprietary protocols that require us
>> to basically override the connector USB data role. The default role
>> should always be selected in the drivers.
>
> OK. Let's take this example
> - Port is dual-role port micro AB.
> - microAB to type-A adapter is connected which pulls ID low. port transit=
ions
> to "host" role by the controller driver.
> - proprietary protocol want to switch role to device role so writes "devi=
ce" to
> mode switch sysfs. port transitions to "device" role.
>
> Now, how does controller driver know to fall back to HW based role switch=
ing?

Use a 'disconnect' or 'suspend' event to go reset it? But that should,
probably, be done at kernel space, no?

=2D-=20
balbi

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