r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2

ThinkPad Thunderbolt 3 Dock Gen 2 is another docking station that uses
RTL8153 based USB ethernet.

The device supports macpassthru, but it failed to pass the test of -AD,
-BND and -BD. Simply bypass these tests since the device supports this
feature just fine.

Also the ACPI objects have some differences between Dell's and Lenovo's,
so make those ACPI infos no longer hardcoded.

BugLink: https://bugs.launchpad.net/bugs/1827961
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index fe630438f67b040e28e81675cb54a44b863acb83..0cdb2ce47645c5874218a0ec8b77d299840706aa 100644 (file)
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -766,6 +766,13 @@ static const struct usb_device_id  products[] = {
        .driver_info = 0,
 },
 
+/* ThinkPad Thunderbolt 3 Dock Gen 2 (based on Realtek RTL8153) */
+{
+       USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x3082, USB_CLASS_COMM,
+                       USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+       .driver_info = 0,
+},
+
 /* Lenovo Thinkpad USB 3.0 Ethernet Adapters (based on Realtek RTL8153) */
 {
        USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x7205, USB_CLASS_COMM,

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index b9f526ed0d30fcb762cb96efeb863b50ba43efba..ac079395c8d468ad6ce919dece86d2d5efb44889 100644 (file)
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -670,6 +670,7 @@ enum rtl8152_flags {
        SCHEDULE_TASKLET,
        GREEN_ETHERNET,
        DELL_TB_RX_AGG_BUG,
+       LENOVO_MACPASSTHRU,
 };
 
 /* Define these values to match your device */
@@ -1408,38 +1409,52 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
        int ret = -EINVAL;
        u32 ocp_data;
        unsigned char buf[6];
-
-       /* 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;
-               }
+       char *mac_obj_name;
+       acpi_object_type mac_obj_type;
+       int mac_strlen;
+
+       if (test_bit(LENOVO_MACPASSTHRU, &tp->flags)) {
+               mac_obj_name = "\\MACA";
+               mac_obj_type = ACPI_TYPE_STRING;
+               mac_strlen = 0x16;
        } 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;
+               /* 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;
        }
 
        /* returns _AUXMAC_#AABBCCDDEEFF# */
-       status = acpi_evaluate_object(NULL, "\\_SB.AMAC", NULL, &buffer);
+       status = acpi_evaluate_object(NULL, mac_obj_name, NULL, &buffer);
        obj = (union acpi_object *)buffer.pointer;
        if (!ACPI_SUCCESS(status))
                return -ENODEV;
-       if (obj->type != ACPI_TYPE_BUFFER || obj->string.length != 0x17) {
+       if (obj->type != mac_obj_type || obj->string.length != mac_strlen) {
                netif_warn(tp, probe, tp->netdev,
                           "Invalid buffer for pass-thru MAC addr: (%d, %d)\n",
                           obj->type, obj->string.length);
                goto amacout;
        }
+
        if (strncmp(obj->string.pointer, "_AUXMAC_#", 9) != 0 ||
            strncmp(obj->string.pointer + 0x15, "#", 1) != 0) {
                netif_warn(tp, probe, tp->netdev,
@@ -6629,6 +6644,10 @@ static int rtl8152_probe(struct usb_interface *intf,
                netdev->hw_features &= ~NETIF_F_RXCSUM;
        }
 
+       if (le16_to_cpu(udev->descriptor.idVendor) == VENDOR_ID_LENOVO &&
+           le16_to_cpu(udev->descriptor.idProduct) == 0x3082)
+               set_bit(LENOVO_MACPASSTHRU, &tp->flags);
+
        if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x3011 && udev->serial &&
            (!strcmp(udev->serial, "000001000000") ||
             !strcmp(udev->serial, "000002000000"))) {
@@ -6755,6 +6774,7 @@ static const struct usb_device_id rtl8152_table[] = {
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x304f)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3062)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3069)},
+       {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3082)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7205)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x720c)},
        {REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7214)},