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

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Date:   Wed, 28 Apr 2021 14:03:07 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Shawn Guo <shawn.guo@...aro.org>, Kalle Valo <kvalo@...eaurora.org>
Cc:     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 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?

Regards,
Arend
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> ---
>   .../broadcom/brcm80211/brcmfmac/cfg80211.c      | 17 +++++++++++------
>   1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index f4405d7861b6..6cb09c7c37b6 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -7442,18 +7442,23 @@ static s32 brcmf_translate_country_code(struct brcmf_pub *drvr, char alpha2[2],
>   	s32 found_index;
>   	int i;
>   
> -	country_codes = drvr->settings->country_codes;
> -	if (!country_codes) {
> -		brcmf_dbg(TRACE, "No country codes configured for device\n");
> -		return -EINVAL;
> -	}
> -
>   	if ((alpha2[0] == ccreq->country_abbrev[0]) &&
>   	    (alpha2[1] == ccreq->country_abbrev[1])) {
>   		brcmf_dbg(TRACE, "Country code already set\n");
>   		return -EAGAIN;
>   	}
>   
> +	country_codes = drvr->settings->country_codes;
> +	if (!country_codes) {
> +		brcmf_dbg(TRACE, "No country codes configured for device, using ISO3166 code and 0 rev\n");
> +		memset(ccreq, 0, sizeof(*ccreq));
> +		ccreq->country_abbrev[0] = alpha2[0];
> +		ccreq->country_abbrev[1] = alpha2[1];
> +		ccreq->ccode[0] = alpha2[0];
> +		ccreq->ccode[1] = alpha2[1];
> +		return 0;
> +	}
> +
>   	found_index = -1;
>   	for (i = 0; i < country_codes->table_size; i++) {
>   		cc = &country_codes->table[i];
>