netdev - Re: [PATCH 2/6] wl1251: Use request_firmware_prefer

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Message-ID: <20170127194012.GE20571@amd>
Date:   Fri, 27 Jan 2017 20:40:12 +0100
From:   Pavel Machek <pavel@....cz>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Ming Lei <ming.lei@...onical.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Gnedt <david.gnedt@...izone.at>,
        Michal Kazior <michal.kazior@...to.com>,
        Daniel Wagner <wagi@...om.org>,
        Tony Lindgren <tony@...mide.com>,
        Sebastian Reichel <sre@...nel.org>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Grazvydas Ignotas <notasas@...il.com>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/6] wl1251: Use request_firmware_prefer_user() for
 loading NVS calibration data

On Fri 2017-01-27 17:23:07, Kalle Valo wrote:
> Pali Rohár <pali.rohar@...il.com> writes:
> 
> > On Friday 27 January 2017 14:26:22 Kalle Valo wrote:
> >> Pali Rohár <pali.rohar@...il.com> writes:
> >> 
> >> > 2) It was already tested that example NVS data can be used for N900 e.g.
> >> > for SSH connection. If real correct data are not available it is better
> >> > to use at least those example (and probably log warning message) so user
> >> > can connect via SSH and start investigating where is problem.
> >> 
> >> I disagree. Allowing default calibration data to be used can be
> >> unnoticed by user and left her wondering why wifi works so badly.
> >
> > So there are only two options:
> >
> > 1) Disallow it and so these users will have non-working wifi.
> >
> > 2) Allow those data to be used as fallback mechanism.
> >
> > And personally I'm against 1) because it will break wifi support for
> > *all* Nokia N900 devices right now.
> 
> All two of them? :)

Umm. You clearly want a flock of angry penguins at your doorsteps :-).

> But not working is exactly my point, if correct calibration data is not
> available wifi should not work. And it's not only about functionality
> problems, there's also the regulatory aspect.

If you break existing configuration that's called "regression".

> >> > 3) If we do rename *now* we will totally break wifi support on Nokia
> >> > N900.
> >> 
> >> Then the distro should fix that when updating the linux-firmware
> >> packages. Can you provide details about the setup, what distro etc?
> >
> > Debian stable, Ubuntu LTSs 14.04, 16.04. 
> 
> You can run these out of box on N900?

Debian stable does.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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