linux-kernel - Re: wl1251 & mac address & calibration data

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Date:   Tue, 20 Dec 2016 08:56:58 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Pali Rohár <pali.rohar@...il.com>,
        Daniel Wagner <wagi@...om.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Tom Gundersen <teg@...m.no>,
        Johannes Berg <johannes@...solutions.net>,
        Ming Lei <ming.lei@...onical.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Michal Kazior <michal.kazior@...to.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Takashi Iwai <tiwai@...e.de>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: wl1251 & mac address & calibration data

* Kalle Valo <kvalo@...eaurora.org> [161220 03:47]:
> Arend Van Spriel <arend.vanspriel@...adcom.com> writes:
> 
> > On 18-12-2016 13:09, Pali Rohár wrote:
> >
> >> File wl1251-nvs.bin is provided by linux-firmware package and contains 
> >> default data which should be overriden by model specific calibrated 
> >> data.
> >
> > Ah. Someone thought it was a good idea to provide the "one ring to rule
> > them all". Nice.
> 
> Yes, that was a bad idea. wl1251-nvs.bin in linux-firmware.git should be
> renamed to wl1251-nvs.bin.example, or something like that, as it should
> be only installed to a real system only if there's no real calibration
> data available (only for developers to use, not real users).

Makes sense to me. Note that with the recent changes to wlcore, we can
now easily provide board specific calibration firmware simply by adding a
new compatible value. So for n900, we could have something like
compatible = "ti,wl1251-n900" and have it point to n900 specific calibration
file wl1251-nvs-n900.bin. Of course this won't help with the mac address,
or any of the device specific data..

That is assuming the calibration values are the same for each similar
device and don't have to be generated for each device. And naturally wl1251
needs simlar changes done to make use of devices specific calibration files.

Regards,

Tony