linux-kernel - Re: [PATCH v2 02/16] wl1251: add sysfs interface for bluetooth coexistence mode configuration

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Message-ID: <87y53spv2p.fsf@purkki.adurom.net>
Date:	Tue, 10 Dec 2013 17:46:54 +0200
From:	Kalle Valo <kvalo@...rom.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Luciano Coelho <luca@...lho.fi>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, freemangordon@....bg,
	aaro.koskinen@....fi, pavel@....cz, sre@...g0.de,
	joni.lapilainen@...il.com,
	Johannes Berg <johannes@...solutions.net>,
	Felipe Contreras <felipe.contreras@...il.com>,
	David Gnedt <david.gnedt@...izone.at>
Subject: Re: [PATCH v2 02/16] wl1251: add sysfs interface for bluetooth coexistence mode configuration

Pali Rohár <pali.rohar@...il.com> writes:

> From: David Gnedt <david.gnedt@...izone.at>
>
> 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.
> 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.
>
> Signed-off-by: David Gnedt <david.gnedt@...izone.at>
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>

I think this is also what I wrote a long time. And also this sysfs hack
should not go to upstream.

Over the years there has been some talk about solving the BT coex
properly, but I haven't seen any patches. I guess the proper solution
would be that BT subsystem in kernel would notify wireless drivers about
BT use?

-- 
Kalle Valo
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