Message-ID: <90a01a09-a280-0dec-2a36-fc70762144ed@lockie.ca>
Date:   Mon, 29 Nov 2021 22:10:04 -0500
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.3.1
Subject: Re: USB for rtw89 driver?
Content-Language: en-US
To:     Larry Finger <Larry.Finger@lwfinger.net>
References: <5bdf4393-273f-2ad2-40e0-556ec7dc6817@lockie.ca>
 <867f4b97151745d5a5fa0daa5ebcdbd2@realtek.com>
 <3fef8020-a496-41e3-8974-4d16ff4551b6@lockie.ca>
 <917dde5b-36c7-a079-6dc1-7441a2f90745@lwfinger.net>
 <dac5960c-44f0-300e-d3d7-6ae23c3ae64f@lockie.ca>
 <5e815a38-eb5c-7dac-7243-1d734c1acd3f@lockie.ca>
 <5fff6faf-87a0-673e-0fda-853eb0391797@lwfinger.net>
From:   James <bjlockie@lockie.ca>
Cc:     linux-wireless <linux-wireless@vger.kernel.org>
In-Reply-To: <5fff6faf-87a0-673e-0fda-853eb0391797@lwfinger.net>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk


On 2021-11-29 20:44, Larry Finger wrote:
> On 11/29/21 17:37, James wrote:
>> Does anyone know what this is?
>> The releasenotes pdf says it came from Realtek.
>>
>> https://github.com/shiqishao/RTL8852AU_WiFi_linux_v1.15.0.1-0-g487ee886.20210714 
>>
>>
>> What are the roadblocks to getting USB support in the kernel driver?
>>
>> Is it possible to have a USB part of the driver that uses the kernel 
>> part of the driver?
>>
>
> The file structure indicates that it is a variation of the USB driver 
> from the Realtek group. As such, it will have all the flaws of that 
> family of drivers.

That is unfortunate but not surprising.
>
> I have previously estimated that it would take about 6 months of work 
> to get such a driver into shape to be submitted into staging. The 
> approach taken in https://github.com/neojou/rtw89-usb will take a lot 
> less time; however, without the cooperation of Realtek, it will take a 
> lot of USB dumps to compare the communication with the chip to 
> discover what differences there are between the PCI and USB versions, 
> other than the obvious base platform data flow.

>
> Have you tried either the shiqishao or the neojou driver? If you are 
> willing to provide me with a device, I could probably give you some 
> help getting the neojou driver into kernel shape.
>
> Larry
>
I don't have the adapter but I do want a wifi6 one.
I have a mediatek wifi5 one and that is pretty decent.

It is unlikely the neojou driver with work by replacing the PCI with 
corresponding USB calls?
I tried to compile it (to see if it even compiles :-)) but there are 
tons of "unused-*" warnings.

I've been reading about the lwfinger repo for the rtw89 PCI driver.
I'm guessing at one point the code between neojou and lwfinger was similar?
Do I have this right, the rtw89 driver will compile on ubuntu but not work?
What distro do you use for development?
Maybe Realtek will help to add the USB support. :-)

Can you provide me with a link to a local store that has the DLink 
DWA-X1850?
I'm not opposed to buying you one but it wouldn't be until next year. :-)