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Re: [PATCH 04/18] wl1251: add sysfs interface for bluetooth coexistence mode configuration

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David Gnedt <david.gnedt@xxxxxxxxxxx> writes:

> Port the bt_coex_mode sysfs interface from wl1251 driver version included
> in the Maemo Fremantle kernel to allow bt-coexistence mode configuration.
> This enables userspace applications to set one of the modes
> WL1251_BT_COEX_OFF, WL1251_BT_COEX_ENABLE and WL1251_BT_COEX_MONOAUDIO.
> The default mode is WL1251_BT_COEX_OFF.

Sorry, but this was an awful hack in the fremantle kernel and I really
would not like to see this in the upstream driver. We should do better
than that :) And besides, who would use it? The only user I know is
maemo's wlancond and maemo is dead and buried anyway. RIP

I'm not saying that we don't need this, I just want to understand
where we need this. And also sysfs is not the best choise imho, maybe
debugfs is better?

> It should be noted that this driver always enabled bt-coexistence before
> and enabled bt-coexistence directly affects the receiving performance,
> rendering it unusable in some low-signal situations. Especially monitor
> mode is affected very badly with bt-coexistence enabled.

Yes, btcoex is very tricky to get right. Also one problem is that
wl1251's btcoex implementation significantly increases power
consumption.

-- 
Kalle Valo
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