ath9k: AR9462 btcoex doesn't appear to work

[Sujith Manoharan <c_manoha@xxxxxxxxxxxxxxxx>]

Sherwin Soltani wrote:
> I have an Acer Aspire V5-571 which contains the AR9462 chipset (PCI ID 
> 168c:0034), supported by the ath9k driver. This chipset claims to 
> support Bluetooth coexistence. However, after booting up, my kernel does 
> not register any Bluetooth devices.
> 
> I am using kernel version 3.6.0-999-generic (apw@gomeisa) (gcc version 
> 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)). I also tried 3.4 and 3.2 kernels 
> without success. Additionally, I can try to do
> 
> rmmod ath9k && modprobe ath9k btcoex_enable=1
> 
> In the message log, I can see this:
> 
> [ 1204.643120] ath9k: ath9k: Driver unloaded
> [ 1214.203099] ath: phy1: Disabling ASPM since BTCOEX is enabled
> [ 1214.203105] ath: EEPROM regdomain: 0x6a
> [ 1214.203106] ath: EEPROM indicates we should expect a direct regpair map
> [ 1214.203108] ath: Country alpha2 being used: 00
> [ 1214.203109] ath: Regpair used: 0x6a
> 
> However 'hcitool dev' shows no devices after this operation.

What does lsusb -v show ?

The correct firmware is required, you can find it in:
http://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git;a=summary

Copy the files in ar3k/ into /lib/firmware/ar3k (might be different depending
on your distro).

Reload ath3k and something like this should be seen:

root@linux-test ~# hciconfig hci1 up
root@linux-test ~# hcitool dev
Devices:
        hci1    00:03:7F:44:84:8A

> Looking back through the ath9k-devel list, I can see that there was some 
> discussion on this chipset, but it seems that Bluetooth functionality 
> wasn't tested with it. Is this a known problem? Is there any information 
> I can supply to help fix it?

Coexistence testing is ongoing and bugs are still being ironed out,
but basic support is mostly done.

> Aside from the Bluetooth problems, there are also problems with 
> frequently dropping signals (even when I am very close to the access 
> point), but right now that's a secondary concern to Bluetooth for me.

Can you try with the latest driver (using compat-wireless) and see if the
problem persists ? If it does, please post the kernel log with driver
debugging set to 0x8f49.

http://wireless.kernel.org/en/users/Drivers/ath9k/debug

Sujith
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