linux-kernel - [PATCH v2] wifi: rtw89: 8922a: set random mac if efuse contains zeroes

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Message-ID: <20251126091905.217951-1-jtornosm@redhat.com>
Date: Wed, 26 Nov 2025 10:18:56 +0100
From: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
To: pkshih@...ltek.com,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
Subject: [PATCH v2] wifi: rtw89: 8922a: set random mac if efuse contains zeroes

I have some rtl8922ae devices with no permanent mac stored in efuse.

It could be properly saved and/or configured from user tools like
NetworkManager, but it would be desirable to be able to initialize it
somehow to get the device working by default.

So, in the same way as with other devices, if the mac address read from
efuse contains zeros, a random mac address is assigned to at least allow
operation, and the user is warned about this in case any action needs to
be considered.

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
---
v2:
  - Fix the typo for the hardware model in comments.
  - Use rtw89_info instead of rtw89_warn.
  - Some fixes in the format of the info message.
v1: https://lore.kernel.org/all/20251125120350.228288-1-jtornosm@redhat.com/

 drivers/net/wireless/realtek/rtw89/rtw8922a.c | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/rtw8922a.c b/drivers/net/wireless/realtek/rtw89/rtw8922a.c
index 6aa19ad259ac..050307fa16d2 100644
--- a/drivers/net/wireless/realtek/rtw89/rtw8922a.c
+++ b/drivers/net/wireless/realtek/rtw89/rtw8922a.c
@@ -636,16 +636,30 @@ static int rtw8922a_read_efuse_rf(struct rtw89_dev *rtwdev, u8 *log_map)
 static int rtw8922a_read_efuse(struct rtw89_dev *rtwdev, u8 *log_map,
 			       enum rtw89_efuse_block block)
 {
+	struct rtw89_efuse *efuse = &rtwdev->efuse;
+	int ret;
+
 	switch (block) {
 	case RTW89_EFUSE_BLOCK_HCI_DIG_PCIE_SDIO:
-		return rtw8922a_read_efuse_pci_sdio(rtwdev, log_map);
+		ret = rtw8922a_read_efuse_pci_sdio(rtwdev, log_map);
+		break;
 	case RTW89_EFUSE_BLOCK_HCI_DIG_USB:
-		return rtw8922a_read_efuse_usb(rtwdev, log_map);
+		ret = rtw8922a_read_efuse_usb(rtwdev, log_map);
+		break;
 	case RTW89_EFUSE_BLOCK_RF:
-		return rtw8922a_read_efuse_rf(rtwdev, log_map);
+		ret = rtw8922a_read_efuse_rf(rtwdev, log_map);
+		break;
 	default:
-		return 0;
+		ret = 0;
+		break;
+	}
+
+	if (!ret && is_zero_ether_addr(efuse->addr)) {
+		rtw89_info(rtwdev, "efuse mac address is zero, using random mac\n");
+		eth_random_addr(efuse->addr);
 	}
+
+	return ret;
 }
 
 #define THM_TRIM_POSITIVE_MASK BIT(6)
-- 
2.51.1