Re: [PATCH] usb: musb: Support gadget mode when the port is set to dual role
From: Maxime Ripard
Date: Thu Mar 29 2018 - 05:23:36 EST
On Wed, Mar 28, 2018 at 11:52:13PM +0200, Paul Kocialkowski wrote:
> This allows dual-role ports to be reported as having gadget mode by the
> musb_has_gadget helper. This is required to enable MUSB at all with MUSB
> glue layers that set the port mode to MUSB_PORT_MODE_DUAL_ROLE at init.
>
> Most notably, this allows calling musb_start when needed in the virtual
> MUSB root HUB, regardless of whether the current mode should be gadget
> or host.
>
> This fixes USB OTG on Allwinner devices that I could test it with,
> mainly A20 devices.
>
> Signed-off-by: Paul Kocialkowski <contact@xxxxxxxx>
Surely there's more to it than that. The gadget mode of A20 boards
have been working in the past, including when compiling with mUSB
setup as dual role.
Is this a regression since a particular commit? Or is there another,
deeper issue overlooked in the commit log?
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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