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

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Date:   Wed, 8 Sep 2021 09:00:58 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Soeren Moch <smoch@....de>
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,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>
Subject: Re: [BUG] Re: [PATCH] brcmfmac: use ISO3166 country code and 0 rev
 as fallback

Hi Soeren,

On Tue, Sep 07, 2021 at 09:22:52PM +0200, Soeren Moch wrote:
> On 25.04.21 13:02, 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.
> This patch breaks wireless support on RockPro64. At least the access
> point is not usable, station mode not tested.
> 
> brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4359/9 wl0: Mar  6 2017
> 10:16:06 version 9.87.51.7 (r686312) FWID 01-4dcc75d9
> 
> Reverting this patch makes the access point show up again with linux-5.14 .

Sorry for breaking your device!

So it sounds like you do not have country_codes configured for your
BCM4359/9 device, while it needs particular `rev` setup for the ccode
you are testing with.  It was "working" likely because you have a static
`ccode` and `regrev` setting in nvram file.  But roaming to a different
region will mostly get you a broken WiFi support.  Is it possible to set
up the country_codes for your device to get it work properly?

Shawn

> 
> Regards,
> Soeren
> > 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];
>