Re: [PATCH v1 0/9] Support UDC on Tegra 20/30/114/124

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On 05.07.2017 23:31, Stephen Warren wrote:
> On 07/05/2017 11:19 AM, Dmitry Osipenko wrote:
>> Some time ago Thierry Reding sent out patches that enabled UDC on NVIDIA
>> Tegra, unfortunately they haven't got enough traction to get into the
>> kernel. I've rebased those patches and added a fix for the Ethernet USB
>> Gadget on Tegra20, Marc Dietrich tested UDC driver on AC100 and Nicolas
>> Chauvet on TK1. Like an original patchset, this series adds support for
>> the peripheral mode only.
> 
> Does this mean that the relevant ports no longer support host mode? That's going
> to be a user-visible regression, which doesn't sound like a good idea. Isn't OTG
> possible instead?

We are going to switch only AC100 and TrimSlice to use the UDC driver. Do you
know whether that port is working in a host mode with the tegra-ehci driver on
these devices? That should be a micro USB port. Since that port is working in a
device mode by default, I presume that switching it into a host mode would
require some extra 'dance', otherwise I may drop the AC100 / TrimSlice patches.

The full-featured OTG should be possible, it could be done later if desired. I'm
leaving it to somebody else to implement.

-- 
Dmitry
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