On 07/05/2017 04:13 PM, Dmitry Osipenko wrote:
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.
Really? I saw patches in the series for Beaver, Dalmore, and Jetson TK1 too.
Do you
know whether that port is working in a host mode with the tegra-ehci driver on
these devices?
If any USB port is enabled in the DT, it was certainly validated at some
point. IIRC, we only have host mode enabled at present. So, yes, I'd
expect this port to work in host mode currently without any issue.
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.
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