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

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Date:	Tue, 10 Dec 2013 17:09:38 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Kalle Valo <kvalo@...rom.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

On Tuesday 10 December 2013 16:46:54 Kalle Valo wrote:
> 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?

See other drivers in upstream, they doing something similar...

-- 
Pali Rohár
pali.rohar@...il.com

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