Re: Driver(s) for Synopsys' DesignWare USB OTG

2012/1/8 Nikolai Zhubr [off-list ref]:

Hello developers,

I'm trying to find/combine/fix a driver for Synopsys' DesignWare USB
controller. This thing is USB 2.0 host/slave/otg capable and is used in
various SoCs including Amlogic 8726M, Ralink RT305x, and probably more.

There is some code floating around, partly usable, but all I could see fo=

r

now is really not perfect. I also saw commit logs on linuxppc-dev, but
failed to find out what repository they are related to. I'd like to know =

if

someone is currently developing/testing/maintaining the driver or is
planning to do so in the near future (in a FOSS-friendly manner - making
development results public immediately and with eventual goal of inclusio=

n

into mainline) in order to avoid duplicate/uncoordinated work and waste o=

f

effort.

I'm currently examining 2 versions (That is, 2 sets of files):

1. From android kernel for 8726m-based tablets (like the one I own). Usab=

le

to some extent, but there are issues (e.g. it looks like certain packets =

get

corrupted, reproducibly, relevant dumps are available)

2. From openwrt kernel for RT305x-based routers. The code looks a bit mor=

e

tidy, but not quite well updated (slave-mode parts are unused in openwrt =

and

they can not even be compiled for modern kernels without certain patching=

;

have not tried host-mode on the hardware yet)

Quite obviously both versions originated from the same code initially, bu=

t

subsequently were apparently tested/corrected/updated by separate teams. =

It

is not quite clear if all bugfixes were cross-applied carefully (if at al=

l).

I was initially hoping that compare and bisect will just do the job, but =

the

driver is quite huge... and some files have diverged substantially in the=

 2

versions, so at the moment I'm a bit fed up and will probably resume a bi=

t

later. Meanwhile, I'd be happy to discuss the subject with whoever
interested in order to plan my further steps.

Please see:
http://marc.info/?l=3Dlinux-usb&m=3D129906859817430&w=3D2

I am not sure we can combine all Synopsys USB drivers to single file, but w=
e
can try combine similar IP versions to one file, this work may need all Syn=
opsys
USB IP driver maintainer work together.

Thank you.
Nikolai.
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--=20
BR,
Peter Chen