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

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Date:	Thu, 21 Jan 2016 16:44:33 +0200
From:	Kalle Valo <kvalo@...eaurora.org>
To:	Pali Rohár <pali.rohar@...il.com>
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

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.

-- 
Kalle Valo