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
Date: Tue, 13 Aug 2019 08:15:32 +0300 [thread overview]
Message-ID: <87v9v1bq8b.fsf@gmail.com> (raw)
In-Reply-To: <679b82bc-9f33-91ad-4acf-bf6a29e51bc1@ti.com>
Hi,
Roger Quadros <rogerq@ti.com> writes:
>> 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 transitions
>>> to "host" role by the controller driver.
>>> - proprietary protocol want to switch role to device role so writes "device" to
>>> mode switch sysfs. port transitions to "device" role.
>>>
>>> Now, how does controller driver know to fall back to HW based role switching?
>>
>> Use a 'disconnect' or 'suspend' event to go reset it? But that should,
>> probably, be done at kernel space, no?
>>
>
> Yes that could be one option.
> So after a disconnect, sysfs role should reflect actual hardware role. correct?
that would be my expectation
--
balbi
next prev parent reply other threads:[~2019-08-13 5:15 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-21 18:32 [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 1/6] dt-bindings: add binding for USBSS-DRD controller Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 2/6] usb:common Separated decoding functions from dwc3 driver Pawel Laszczak
2019-07-21 19:05 ` Joe Perches
2019-07-21 20:45 ` Alan Stern
2019-07-21 20:54 ` Joe Perches
2019-07-22 10:06 ` Pawel Laszczak
2019-07-22 11:49 ` gregkh
2019-07-21 18:32 ` [PATCH v10 3/6] usb:common Patch simplify usb_decode_set_clear_feature function Pawel Laszczak
2019-07-21 19:07 ` Joe Perches
2019-07-22 10:12 ` Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 4/6] usb:common Simplify usb_decode_get_set_descriptor function Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver Pawel Laszczak
2019-07-31 3:36 ` Pawel Laszczak
2019-08-07 12:08 ` Roger Quadros
2019-08-11 11:59 ` Pawel Laszczak
2019-08-12 8:45 ` Roger Quadros
2019-08-12 9:43 ` Pawel Laszczak
2019-08-12 10:31 ` Heikki Krogerus
2019-08-12 11:05 ` Roger Quadros
2019-08-12 12:46 ` Felipe Balbi
2019-08-12 13:04 ` Roger Quadros
2019-08-13 5:15 ` Felipe Balbi [this message]
2019-08-13 7:30 ` Chunfeng Yun
2019-08-13 7:48 ` Roger Quadros
2019-08-13 8:50 ` Chunfeng Yun
2019-08-12 10:05 ` Roger Quadros
2019-08-12 11:10 ` Pawel Laszczak
2019-08-14 13:32 ` Roger Quadros
2019-08-15 6:10 ` Felipe Balbi
2019-08-19 8:20 ` Pawel Laszczak
2019-08-14 13:38 ` Roger Quadros
2019-08-14 14:30 ` Pawel Laszczak
2019-08-15 11:22 ` Roger Quadros
2019-08-19 10:30 ` Pawel Laszczak
2019-08-19 10:59 ` Roger Quadros
2019-08-23 8:53 ` Vignesh Raghavendra
2019-08-23 9:39 ` Pawel Laszczak
2019-08-26 2:16 ` Peter Chen
2019-08-26 7:53 ` Pawel Laszczak
2019-07-21 18:32 ` [PATCH v10 6/6] usb:cdns3 Fix for stuck packets in on-chip OUT buffer Pawel Laszczak
2019-07-21 19:03 ` [PATCH v10 0/6] Introduced new Cadence USBSS DRD Driver Pavel Machek
2019-07-22 9:58 ` Pawel Laszczak
2019-07-22 11:48 ` gregkh
2019-07-22 11:56 ` Pavel Machek
2019-07-22 12:11 ` gregkh
2019-07-22 12:11 ` Pawel Laszczak
2019-07-22 21:00 ` Pavel Machek
2019-07-23 4:32 ` Pawel Laszczak
2019-08-07 11:05 ` Roger Quadros
2019-08-08 4:12 ` Pawel Laszczak
2019-08-09 10:36 ` Roger Quadros
2019-08-09 10:44 ` Felipe Balbi
2019-08-13 8:22 ` Pavel Machek
2019-08-15 12:12 ` Roger Quadros
2019-08-15 14:39 ` Alan Stern
2019-08-19 12:08 ` Roger Quadros
2019-08-19 14:19 ` Alan Stern
2019-08-21 9:54 ` Roger Quadros
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