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SubjectRe: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver


Roger Quadros <> writes:
>> Roger Quadros <> 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


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