Re: [PATCH] USB:serial:pl2303:Add new PID to support PL2303HXN (TYPE_HXN)

[Charles Yeh <charlesyeh522@gmail.com>]

Johan Hovold <johan@kernel.org> 於 2019年4月17日 週三 下午7:13寫道：

> > The code I see in the pl2303_set_termios function
> > is still pl2303_vendor_write(serial,0x0,0x41),
> > Not pl2303_update_reg(serial,0,PL2303_FLOWCTRL_MASK,0x40);
>
> Yes, you need to base it on my usb-next branch (or linux-next):
>
>         git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git

OK, I will use
"git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial.git "


> I'll try to clean up the current driver some more based on your
> feedback. I'll get back to you as soon as have something concrete
> and we'll get the HXN support in place.

Thank you very much!

>
> Meanwhile here are few questions:
>
>  1. Can bcdUSB be used to detect the HXN devices?

No , you can't use bcdUSB be used to detect the HXN devices.
>
>  2. Does the old (type 01 and hx) devices require the register address
>     to be ORed with 0x80 when reading?

Yes, the old (type_01 and HX ) needs require the register address to be
ORed with 0x80 when reading.


>  3. And the HXN does not need that ORing with 0x80 it seems?
Yes, HXN's hardware design is different old (type_01 and hx).

>  4. How do you use the chip-reset register (0x7) on HXN; do you write
>     0x03 if you only want to reset both data pipes?
Yes, I only want to reset both data pipes.

Charles.