linux-kernel - Re: [PATCH] usb: musb: Support gadget mode when the port is set to dual role

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Message-ID: <20180329092326.dayuccomq5zrywqo@flea>
Date:   Thu, 29 Mar 2018 11:23:26 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Paul Kocialkowski <contact@...lk.fr>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bin Liu <b-liu@...com>, Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH] usb: musb: Support gadget mode when the port is set to
 dual role

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@...lk.fr>

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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