brcmfmac: use ISO3166 country code and 0 rev as fallback

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.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210425110200.3050-1-shawn.guo@linaro.org

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];