tg3: 5715 does not link up when autoneg off

Commit 98ff5ae695a1d4ca0bff220c20b5b65a5a5c7d8a ("tg3: Remove
SPEED_UNKNOWN checks") cleaned up the autoneg advertisement by
removing some dead code. One effect of this change was that the
advertisement register would not be updated if autoneg is turned off.

This exposed a bug on the 5715 device w.r.t linking. The 5715 defaults
to advertise only 10Mb Full duplex. But with autoneg disabled, it needs
the configured speed enabled in the advertisement register to link up.

This patch adds the work around to advertise all speeds on the 5715 when
autoneg is disabled.

Reported-by: Marcin Miotk <marcinmiotk81@gmail.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 93729f9423588de05fa4d5e25dbcef99438fd17d..67d2663b3974aeaf03acfeb9500704ee5659ab8a 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -4130,6 +4130,14 @@ static void tg3_phy_copper_begin(struct tg3 *tp)
                tp->link_config.active_speed = tp->link_config.speed;
                tp->link_config.active_duplex = tp->link_config.duplex;
 
+               if (tg3_asic_rev(tp) == ASIC_REV_5714) {
+                       /* With autoneg disabled, 5715 only links up when the
+                        * advertisement register has the configured speed
+                        * enabled.
+                        */
+                       tg3_writephy(tp, MII_ADVERTISE, ADVERTISE_ALL);
+               }
+
                bmcr = 0;
                switch (tp->link_config.speed) {
                default: