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Subject: Re: [PATCH 00/13] usb: dwc3: meson: add OTG support for GXL/GXM
To:     Felipe Balbi <balbi@kernel.org>, kishon@ti.com,
        khilman@baylibre.com, martin.blumenstingl@googlemail.com
Cc:     linux-amlogic@lists.infradead.org, linux-usb@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20200324102030.31000-1-narmstrong@baylibre.com>
 <87369rfo7l.fsf@kernel.org> <87r1vm4xyq.fsf@kernel.org>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <8404c7a0-fca7-9e28-b65a-312ed09ecdd3@baylibre.com>
Date:   Thu, 14 May 2020 14:42:13 +0200
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From: Neil Armstrong <narmstrong@baylibre.com>
To: Felipe Balbi <balbi@kernel.org>, kishon@ti.com, khilman@baylibre.com,
 martin.blumenstingl@googlemail.com
Cc: linux-amlogic@lists.infradead.org, linux-usb@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Message-ID: <8404c7a0-fca7-9e28-b65a-312ed09ecdd3@baylibre.com>
Subject: Re: [PATCH 00/13] usb: dwc3: meson: add OTG support for GXL/GXM
References: <20200324102030.31000-1-narmstrong@baylibre.com>
 <87369rfo7l.fsf@kernel.org> <87r1vm4xyq.fsf@kernel.org>
In-Reply-To: <87r1vm4xyq.fsf@kernel.org>

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Hi,

On 14/05/2020 12:23, Felipe Balbi wrote:
> Felipe Balbi <balbi@kernel.org> writes:
>=20
>> Neil Armstrong <narmstrong@baylibre.com> writes:
>>
>>> The USB support was initialy done with a set of PHYs and dwc3-of-simp=
le
>>> because the architecture of the USB complex was not understood correc=
tly
>>> at the time (and proper documentation was missing...).
>>>
>>> But with the G12A family, the USB complex was correctly understood an=
d
>>> implemented correctly.
>>> But seems the G12A architecture was derived for the GXL USB architect=
ure,
>>> with minor differences and looks we can share most of the USB DWC3 gl=
ue
>>> driver.
>>>
>>> This patchset refactors and adds callbacks to handle the architecture=

>>> difference while keeping the main code shared.
>>>
>>> The main difference is that on GXL/GXM the USB2 PHY control registers=

>>> are mixed with the PHY registers (we already handle correctly), and
>>> the GLUE registers are allmost (99%) the same as G12A.
>>>
>>> But, the GXL/GXM HW is buggy, here are the quirks :
>>> - for the DWC2 controller to reset correctly, the GLUE mux must be sw=
itched
>>>   to peripheral when the DWC2 controlle probes. For now it's handled =
by simply
>>>   switching to device when probing the subnodes, but it may be not en=
ough
>>> - when manually switching from Host to Device when the USB port is no=
t
>>>   populated (should not happen with proper Micro-USB/USB-C OTG switch=
), it
>>>   makes the DWC3 to crash. The only way to avoid that is to use the H=
ost
>>>   Disconnect bit to disconnect the DWC3 controller from the port, but=
 we can't
>>>   recover the Host functionnality unless resetting the DWC3 controlle=
r.
>>>   This bit is set when only manual switch is done, and a warning is p=
rinted
>>>   on manual switching.
>>>
>>> The patches 1-8 should be applied first, then either waiting the next=
 release
>>> or if the usb maintainer can provide us a stable tag, we can use it t=
o merge
>>> the DT and bindings.
>>
>> it's unclear to me if this series is ready to be merged. Can someone
>> confirm? If it is, can you resend with all reviewed by tags in place?
>=20
> Are we getting a v2 for this?
>=20

Yes, even a v3 with reviews on all patches:
http://lkml.kernel.org/r/20200416121910.12723-1-narmstrong@baylibre.com

Neil


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