[v5] cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader.

[macpaul.lin@mediatek.com]

On Tue, 2018-12-18 at 23:42 +0700, Lars Melin wrote:
> On 12/18/2018 22:19, Macpaul Lin wrote:
> 
> 
> > Hi all,
> > 
> > After double check the PID/VID officially used (registered) by Mediatek
> > Inc. The following VID/PID maps to the corresponding USB interface of
> > the firmware of cell phone.
> > VID:0x0e8d, PID:0x0003: Mediatek BROM.
> > VID:0x0e8d, PID:0x2000: Mediatek Preloader.
> > 
> > I will update Patch v6 for changing Andrey's previous comments.
> > 
> 
> You should show us a verbose lsusb of your 0e8d:0003 before changing
> Andrey's submission.
> 
> 
> Season's Greeting
> Lars

Hi Lars, Oliver, and Johan,

Well, it's about 1:30 a.m. here in Taiwan. I can do lsusb dump tomorrow
in Mediatek's office.
But there are a lot of tutorials about hacking and flash method of
customized firmware over the WWW. I can find one of the tutorial shows
these VID/PID combinations has been used since 2014.
(Actually they've been registered officially earlier than 2014.)

For example, please check the reference tutorial:
https://mattboyer.github.io/PYaffs/2014/07/31/Hacklog%233.html
You can check lsusb dump in this picture.
https://mattboyer.github.io/PYaffs/images/03_device_usbview.png
Both VID/PID of Mediatek BROM and Preloader can be found in INF file
pasted in this tutorial, too.
Sorry for the proprietary information policy I cannot paste them all,
but the VID/PID set of BROM and Preloader are just exactly the same
as described in this tutorial.

Thanks!

Regards,
Macpaul Lin