lan78xx: Read initial EEE status from DT

Add two new DT properties:
* microchip,eee-enabled  - a boolean to enable EEE
* microchip,tx-lpi-timer - time in microseconds to wait before entering
                           low power state

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
(cherry picked from commit 3aa9eb6eeffde4c317b41f488de0682fc027d768
https://github.com/raspberrypi/linux raspi/rpi-4.15.y)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index a875e472f40c3e226d6bd33a7669d0f46555e2ae..c78c2cc24b470b0af4e71b3d4a8c61dd8ee6f195 100644 (file)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2538,6 +2538,22 @@ static int lan78xx_open(struct net_device *net)
        if (ret < 0)
                goto done;
 
+       if (of_property_read_bool(dev->udev->dev.of_node,
+                                 "microchip,eee-enabled")) {
+               struct ethtool_eee edata;
+               memset(&edata, 0, sizeof(edata));
+               edata.cmd = ETHTOOL_SEEE;
+               edata.advertised = ADVERTISED_1000baseT_Full |
+                                  ADVERTISED_100baseT_Full;
+               edata.eee_enabled = true;
+               edata.tx_lpi_enabled = true;
+               if (of_property_read_u32(dev->udev->dev.of_node,
+                                        "microchip,tx-lpi-timer",
+                                        &edata.tx_lpi_timer))
+                       edata.tx_lpi_timer = 600; /* non-aggressive */
+               (void)lan78xx_set_eee(net, &edata);
+       }
+
        /* for Link Check */
        if (dev->urb_intr) {
                ret = usb_submit_urb(dev->urb_intr, GFP_KERNEL);