netdev - Re: [PATCH] brcmfmac: use ISO3166 country code and 0 rev as fallback

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Message-ID: <17998013ac0.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
Date:   Sun, 23 May 2021 08:54:48 +0200
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Shawn Guo <shawn.guo@...aro.org>
CC:     Kalle Valo <kvalo@...eaurora.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        "Chi-hsien Lin" <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        "Chung-hsien Hsu" <chung-hsien.hsu@...ineon.com>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <brcm80211-dev-list.pdl@...adcom.com>,
        <SHA-cyfmac-dev-list@...ineon.com>
Subject: Re: [PATCH] brcmfmac: use ISO3166 country code and 0 rev as fallback

On May 23, 2021 8:12:29 AM Shawn Guo <shawn.guo@...aro.org> wrote:

> On Wed, Apr 28, 2021 at 08:42:29PM +0800, Shawn Guo wrote:
>> On Wed, Apr 28, 2021 at 02:03:07PM +0200, Arend van Spriel wrote:
>>> On 4/25/2021 1:02 PM, Shawn Guo wrote:
>>>> Instead of aborting country code setup in firmware, use ISO3166 country
>>>> code and 0 rev as fallback, when country_codes mapping table is not
>>>> configured.  This fallback saves the country_codes table setup for recent
>>>> brcmfmac chipsets/firmwares, which just use ISO3166 code and require no
>>>> revision number.
>>>
>>> I am somewhat surprised, but with the brcm-spinoffs (cypress/infineon and
>>> synaptics) my understanding may have been surpassed by reality. Would you
>>> happen to know which chipsets/firmwares require only ISO3166 code and no
>>> rev?
>>
>> The "no rev" here actually means 'rev' field being zero.  The chipset
>> I'm running is a BCM43012 from Synaptics, I think.
>>
>> Firmware: BCM43012/2 wl0: Apr 16 2021 15:25:36 version 18.35.389.63.t2 
>> (wlan=r836194) FWID 01-a8c7bac
>
> Arend,
>
> Does it make sense?  Or is there actually a country code mapping table
> I'm not aware of?

I recall the firmware always include a rev 0 for each country code. I will 
have to ask internally whether that may be used for any chipset. If so, it 
seems reasonable to use rev 0 as fallback when no mapping table is provided.

Regards,
Arend




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