ath5k: disable 5 GHz support for the dualband PHY chip on dual-radio AR5312

There are two variants of AR5312 dual-band devices, one single-radio
and the other one dual-radio. On the dual-radio board, the first MAC
only supports 5 GHz, even though it has a dual-band PHY. The 2.4 GHz
part of this phy is used in pass-through mode, connecting the second
MAC with the second PHY.
Disable 2.4 GHz for the first MAC on an AR5312, but only if the board
configuration indicates a dual-radio device.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath5k/attach.c b/drivers/net/wireless/ath/ath5k/attach.c
index 326d7c84c912..1588401de3c4 100644
--- a/drivers/net/wireless/ath/ath5k/attach.c
+++ b/drivers/net/wireless/ath/ath5k/attach.c
@@ -313,6 +313,11 @@ int ath5k_hw_init(struct ath5k_softc *sc)
                 goto err;
         }
 
+        if (test_bit(ATH_STAT_2G_DISABLED, sc->status)) {
+                __clear_bit(AR5K_MODE_11B, ah->ah_capabilities.cap_mode);
+                __clear_bit(AR5K_MODE_11G, ah->ah_capabilities.cap_mode);
+        }
+
         /* Crypto settings */
         common->keymax = (sc->ah->ah_version == AR5K_AR5210 ?
                           AR5K_KEYTABLE_SIZE_5210 : AR5K_KEYTABLE_SIZE_5211);