linux/drivers/net/wireless/broadcom
Hans de Goede a21bf90e92 brcmfmac: use ISO3166 country code and 0 rev as fallback on some devices
This is a second attempt at honering the country code send out by access
points. This was first added in commit b0b524f079 ("brcmfmac: use
ISO3166 country code and 0 rev as fallback").

Subsequently this was reverted in commit 151a7c12c4 ("Revert "brcmfmac:
use ISO3166 country code and 0 rev as fallback""), because it was causing
issues with AP mode on some brcmfmac models (specifically on BCM4359/9).

Many devices ship with a nvram ccode value of X2/XT/XU/XV/ALL which are
all special world-wide compatibility ccode-s. Most of these world-wide
ccode-s allow passive scan mode only for 2.4GHz channels 12-14,
only enabling them when an AP is seen on them.

But at least on brcmfmac43455 devices this is not working correctly, these
do not see accesspoints on channels 12-14 unless the ccode is changes to
a country where these channels are allowed.

Translating received country codes to an ISO3166 country code and 0 rev
ccreq fixes devices using a brcmfmac43455 with a X2/XT/XU/XV/ALL ccode
not seeing accesspoints on channels 12-14.

To avoid this causing issues on other brcmfmac models again, the
fallback is limited to only brcmfmac4345* chips this time.

Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Soeren Moch <smoch@web.de>
Cc: Fabio Aiuto <fabioaiuto83@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Soeren Moch <smoch@web.de>  # on BCM4359/9
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20211218185643.158182-1-hdegoede@redhat.com
2022-01-28 18:03:35 +02:00
..
b43 b43: fix a lower bounds test 2021-10-11 09:09:30 +03:00
b43legacy b43legacy: fix a lower bounds test 2021-10-11 09:09:29 +03:00
brcm80211 brcmfmac: use ISO3166 country code and 0 rev as fallback on some devices 2022-01-28 18:03:35 +02:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00