[PATCH v2] wifi: ath11k: retrieve MAC address from system firmware if provided

[Jun Yu]

Devices may provide their own MAC address via system firmware (e.g.,
device tree), especially in the case where the device doesn't have a
useful EEPROM on which to store its MAC address (e.g., for integrated
ahb WCN6750).

Use the generic device helper to retrieve the MAC address, and (if
present) honor it above the MAC address advertised by the card.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1

Signed-off-by: Jun Yu <junyuu at chromium.org>
---
 drivers/net/wireless/ath/ath11k/mac.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 7e91e347c9ff2..16a238ef713e7 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -8967,6 +8967,7 @@ int ath11k_mac_register(struct ath11k_base *ab)
 	struct ath11k_pdev *pdev;
 	int i;
 	int ret;
+	u8 mac_addr[ETH_ALEN] = {0};
 
 	if (test_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags))
 		return 0;
@@ -8979,13 +8980,18 @@ int ath11k_mac_register(struct ath11k_base *ab)
 	if (ret)
 		return ret;
 
+	device_get_mac_address(ab->dev, mac_addr);
+
 	for (i = 0; i < ab->num_radios; i++) {
 		pdev = &ab->pdevs[i];
 		ar = pdev->ar;
 		if (ab->pdevs_macaddr_valid) {
 			ether_addr_copy(ar->mac_addr, pdev->mac_addr);
 		} else {
-			ether_addr_copy(ar->mac_addr, ab->mac_addr);
+			if (is_zero_ether_addr(mac_addr))
+				ether_addr_copy(ar->mac_addr, ab->mac_addr);
+			else
+				ether_addr_copy(ar->mac_addr, mac_addr);
 			ar->mac_addr[4] += i;
 		}
 
-- 
2.31.0