From: Chris Morgan <macromorgan@xxxxxxxxxxx>
When the MAC address read from the efuse data is invalid, warn the
user and use a random MAC address instead.
On a device I am currently using (Anbernic RG-ARC) with a rtw8821cs
the efuse appears to be incompletely/improperly programmed. The MAC
address reads as ff:ff:ff:ff:ff:ff. When networkmanager attempts to
initiate a connection (and I haven't hard-coded a MAC address or
set it to random) it fails to establish a connection.
Signed-off-by: Chris Morgan <macromorgan@xxxxxxxxxxx>
---
drivers/net/wireless/realtek/rtw88/main.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 4a33d2e47f33..6d22628129d0 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -2008,6 +2008,11 @@ static int rtw_chip_efuse_info_setup(struct rtw_dev *rtwdev)
efuse->ext_pa_5g = efuse->pa_type_5g & BIT(0) ? 1 : 0;
efuse->ext_lna_2g = efuse->lna_type_5g & BIT(3) ? 1 : 0;
+ if (!is_valid_ether_addr(efuse->addr)) {
+ eth_random_addr(efuse->addr);
+ dev_warn(rtwdev->dev, "efuse MAC invalid, using random\n");
+ }
+
out_disable:
rtw_chip_efuse_disable(rtwdev);
--
2.34.1
