[PATCH] net/phy: fix DP83865 10 Mbps HDX loopback disable function

[Peter Mamonov]

According to the DP83865 datasheet "The 10 Mbps HDX loopback can be
disabled in the expanded memory register 0x1C0.1." The driver erroneously
used bit 0 instead of bit 1.

Signed-off-by: Peter Mamonov <pmamo...@gmail.com>
---
 drivers/net/phy/national.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/national.c b/drivers/net/phy/national.c
index 2addf1d3f619..4892e785dbf3 100644
--- a/drivers/net/phy/national.c
+++ b/drivers/net/phy/national.c
@@ -110,11 +110,14 @@ static void ns_giga_speed_fallback(struct phy_device 
*phydev, int mode)
 
 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable)
 {
+       u16 lb_dis = 1 << 1;
+
        if (disable)
-               ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1);
+               ns_exp_write(phydev, 0x1c0,
+                            ns_exp_read(phydev, 0x1c0) | lb_dis);
        else
                ns_exp_write(phydev, 0x1c0,
-                            ns_exp_read(phydev, 0x1c0) & 0xfffe);
+                            ns_exp_read(phydev, 0x1c0) & ~lb_dis);
 
        pr_debug("10BASE-T HDX loopback %s\n",
                 (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on");
-- 
2.23.0