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

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Date:	Fri, 22 Jan 2016 10:29:35 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Kalle Valo <kvalo@...eaurora.org>
Cc:	Pavel Machek <pavel@....cz>, Arend van Spriel <arend@...adcom.com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Gnedt <david.gnedt@...izone.at>
Subject: Re: [PATCH v2] wl1251: add sysfs interface for bluetooth coexistence
 mode configuration

On Thursday 21 January 2016 16:44:33 Kalle Valo wrote:
> Pali Rohár <pali.rohar@...il.com> writes:
> 
> > On Thursday 21 January 2016 15:48:14 Kalle Valo wrote:
> >> Pali Rohár <pali.rohar@...il.com> writes:
> >> 
> >> > On Thursday 14 January 2016 10:16:54 Pavel Machek wrote:
> >> >> On Wed 2016-01-13 23:32:47, Arend van Spriel wrote:
> >> >> > On 12/26/2015 12:45 PM, Pali Rohár wrote:
> >> >> > >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.
> >> >> > 
> >> >> > So what user-space process will be using this interface. Did you consider
> >> >> > adding debugfs interface? In case of monitor mode you could consider
> >> >> > disabling bt-coex from within the driver itself.
> >> >> 
> >> >> This aint no debugging feature.
> >> >
> >> > Right, bt-coex is not for debugging purpose, but for normal usage, when
> >> > user want to use together bluetooth and wifi or just one of those.
> >> 
> >> I think most of other drivers have a debugfs interface for btcoex, I
> >> guess mostly for testing purposes. But this really should be added to
> >> cfg80211.
> >
> > All other TI wireless drivers have "bt_coex_state" sysfs node.
> 
> Then that's a mistake, they shouldn't have that.

But it is there, wl1251 is also TI wireless driver and for last two
years there is no interface to deal with this problem...

So as other drivers do, I'm proposing solution which fix bt coex also
for wl1251 driver need on Nokia N900.

-- 
Pali Rohár
pali.rohar@...il.com