linux-kernel - [PATCH] net: usb: r8152: Add MAC passthrough support for RTL8153BL

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Date:   Thu, 27 Jan 2022 18:01:09 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     Mario.Limonciello@....com, aaron.ma@...onical.com, kuba@...nel.org,
        henning.schild@...mens.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     davem@...emloft.net, hayeswang@...ltek.com, tiwai@...e.de
Subject: [PATCH] net: usb: r8152: Add MAC passthrough support for RTL8153BL

RTL8153-BL is used in Lenovo Thunderbolt4 dock.
Add the support of MAC passthrough.
This is ported from Realtek Outbox driver r8152.53.56-2.15.0.

There are 2 kinds of rules for MAC passthrough of Lenovo products,
1st USB vendor ID belongs to Lenovo, 2nd the chip of RTL8153-BL
is dedicated for Lenovo. Check the ocp data first then set ACPI object
names.

Suggested-by: Hayes Wang <hayeswang@...ltek.com>
Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
---
 drivers/net/usb/r8152.c | 44 ++++++++++++++++++++++-------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index ee41088c5251..df997b330ee4 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -718,6 +718,7 @@ enum spd_duplex {
 #define AD_MASK			0xfee0
 #define BND_MASK		0x0004
 #define BD_MASK			0x0001
+#define BL_MASK                 BIT(3)
 #define EFUSE			0xcfdb
 #define PASS_THRU_MASK		0x1
 
@@ -1606,31 +1607,34 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
 	acpi_object_type mac_obj_type;
 	int mac_strlen;
 
+	/* test for -AD variant of RTL8153 */
+	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
+	if ((ocp_data & AD_MASK) == 0x1000) {
+		/* test for MAC address pass-through bit */
+		ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, EFUSE);
+		if ((ocp_data & PASS_THRU_MASK) != 1) {
+			netif_dbg(tp, probe, tp->netdev,
+					"No efuse for RTL8153-AD MAC pass through\n");
+			return -ENODEV;
+		}
+	} else {
+		ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
+		if (tp->version == RTL_VER_09 && (ocp_data & BL_MASK)) {
+			/* test for RTL8153BL for Lenovo */
+			tp->lenovo_macpassthru = 1;
+		} else if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {
+			/* test for RTL8153-BND and RTL8153-BD */
+			netif_dbg(tp, probe, tp->netdev,
+					"Invalid variant for MAC pass through\n");
+			return -ENODEV;
+		}
+	}
+
 	if (tp->lenovo_macpassthru) {
 		mac_obj_name = "\\MACA";
 		mac_obj_type = ACPI_TYPE_STRING;
 		mac_strlen = 0x16;
 	} else {
-		/* test for -AD variant of RTL8153 */
-		ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
-		if ((ocp_data & AD_MASK) == 0x1000) {
-			/* test for MAC address pass-through bit */
-			ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, EFUSE);
-			if ((ocp_data & PASS_THRU_MASK) != 1) {
-				netif_dbg(tp, probe, tp->netdev,
-						"No efuse for RTL8153-AD MAC pass through\n");
-				return -ENODEV;
-			}
-		} else {
-			/* test for RTL8153-BND and RTL8153-BD */
-			ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
-			if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {
-				netif_dbg(tp, probe, tp->netdev,
-						"Invalid variant for MAC pass through\n");
-				return -ENODEV;
-			}
-		}
-
 		mac_obj_name = "\\_SB.AMAC";
 		mac_obj_type = ACPI_TYPE_BUFFER;
 		mac_strlen = 0x17;
-- 
2.32.0