Re: [BUG REPORT] mt76: LED not working on ASUS AC51 USB (mt7610U)

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> Hi,
> Below is a bug I submitted on Suse bugzilla - they said I should it submit
> it to linux-wireless.
> 
> LED not working on ASUS AC51 wireless USB adapter (MT7610U chipset) using
> Mediatek driver
> 
> The activity LED on my ASUS AC51 wireless USB adapter does not flash when there is link activity. Everything else works - the adapter connects to wireless networks, but the LED never flashes.  The LED works fine in Windows 10.
> 
> Reproducible: Always
> 
> Steps to Reproduce:
> 1. Plug ASUS AC51 adapter into a USB port.
> 2. No need to install a driver (driver is in-kernel)
> 3.(Optional) reboot
> 4. Connect to wireless network.
> 5. Open a browser and bring up a web page.
> Actual Results:
> The activity LED on the AC51 never flashes even though there is network activity.
> 
> Expected Results:
> The activity LED on the AC51 should flash when there is network activity.
> 
> The OS is Opensuse Tumbleweed 6.0.5-1-default.
> 
> The info from lsusb is:
> 
> ASUSTek Computer, Inc. AC51 802.11a/b/g/n/ac Wireless Adapter [Mediatek MT7610U]
> 
> Bus 001 Device 003: ID 0b05:17d1 ASUSTek Computer, Inc. AC51 802.11a/b/g/n/ac Wireless Adapter [Mediatek MT7610U]
> 
> I have checked the kernel config file and  CONFIG_MT76_LEDS=y is set.
> 

In the current codebase mt76_leds is only supported for mmio devices since
afaik mac80211 requires the driver led callbacks to be atomic while usb
configuration path can't run in atomic context.
I will work on a solution to overcome this problem.

Regards,
Lorenzo

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