Enable Mediatek mt7601u wifi driver in 4.2 tree

[clivem]

Please enable the Mediatek mt7601u wifi driver in the 4.2 tree.

CONFIG_WL_MEDIATEK=y
CONFIG_MT7601U=m

I don't actually use it myself, but remember someone opened an issue in the past about getting a driver included for this wifi dongle, to which the response was something along the lines of, "when it's upstreamed we'll enable it". It got added with 4.2rc3 IIRC.

[popcornmix]

Added.

[clivem]

Popcornmix, I just noticed the other "issue" that was closed, someone suggesting moving to 4.2 quickly, to gain in-tree support for the mt7601u. What about back-porting the driver from 4.2 to 4.1. I've been applying the following on top of RPI 4.1 tree....
http://www3.squeezecommunity.org/patches/0001-backport-mediatek-mt7601u-from-v4.2-rc3.patch
Just a suggestion. There do seem to be quite a few RPI users with a mt7601u based dongle and most of them seem to struggle with compiling modules to support it. I have put many gigs of data through the driver patched into RPI 4.1 kernel without any issues.

[clivem]

Ok, cool. See you have a applied the backport patch to rpi-4.1.y. Also need to make sure the Linux distribution (raspbian????) supplies the firmware for an out-of-the-box experience. The driver needs to load /lib/firmware/mt7601u.bin to bring the dongle up. Don't think that has been added to linux-firmware.git yet. Seem to recall that is obtained from the MediaTek vendor tarball. (File is called MT7601.bin in their tarball.) This is from memory. Not in front of my "work" computer at the moment. I'll post a new comment later today confirming this.

[popcornmix]

Okay, rpi-update should contain the driver. Can you test it and confirm it works?

Note: We don't normally support out of tree drivers, but as this is from upstream 4.2 and looks safe, I've included it until we move to 4.2. If there are problems reported I'll drop the patch.

@XECDesign would be good to include the firmware file for this in repo.

[clivem]

Just a quick note.... The firmware I have been using is obtained from downloading the vendor (MediaTek) driver from http://www.mediatek.com/en/downloads1/downloads/mt7601u-usb/
Extract the archive and ....
cp DPO_MT7601U_LinuxSTA_3.0.0.4_20130913/mcu/bin/MT7601.bin /lib/firmware/mt7601u.bin

[XECDesign]

Added to the todo list.

[letetfly]

I have testet this 4.1.5 with dwa-127 with mt7601u chip. Only had to manually provide the MT7601.bin to the location /lib/firmware/MT7601u.bin to get i work. Thats it.
Thx for putting it almost in place, much easier and quicker than compiling your self or waiting for 4.2 to officially be released.

EDIT: Not successful with hostapd yet...

[heniotierra]

Hey, thanks!

It was me who opened the previous issue. The timing was just perfect since today I had to do a clean install of Raspbian, after messing some things up accidentally. :) And I can also confirm it's working after copying MT7601.bin to /lib/firmware/.

[XECDesign]

This should go in the next release
RPi-Distro/firmware-nonfree@cff948c

[heniotierra]

Yes, but there's one thing to note. The driver from Mediatek is the old one. The new one (which is to be released with kernel 4.2) was written based on Mediatek's, but seems like a better driver.

Here is the new driver's source: https://github.com/kuba-moo/mt7601u.

[XECDesign]

@popcornmix What's the preferred firmware here?

[popcornmix]

We're using the driver from 4.2 (which is the kuba-moo one). I believe that recommends using the mediatek firmware as described by @clivem in #1090 (comment)
So, I think mt7601u.bin is fine.