ath9k_hw: fall back to OTP ROM when platform data has no valid eeprom data

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index 25de6f9a9778..3cddd78e88ac 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -3260,10 +3260,20 @@ static int ar9300_eeprom_restore_internal(struct ath_hw *ah,
         int it;
         u16 checksum, mchecksum;
         struct ath_common *common = ath9k_hw_common(ah);
+        struct ar9300_eeprom *eep;
         eeprom_read_op read;
 
-        if (ath9k_hw_use_flash(ah))
-                return ar9300_eeprom_restore_flash(ah, mptr, mdata_size);
+        if (ath9k_hw_use_flash(ah)) {
+                u8 txrx;
+
+                ar9300_eeprom_restore_flash(ah, mptr, mdata_size);
+
+                /* check if eeprom contains valid data */
+                eep = (struct ar9300_eeprom *) mptr;
+                txrx = eep->baseEepHeader.txrxMask;
+                if (txrx != 0 && txrx != 0xff)
+                        return 0;
+        }
 
         word = kzalloc(2048, GFP_KERNEL);
         if (!word)