mvneta: add forgotten initialization of autonegotiation bits

The commit 898b2970e2c9 ("mvneta: implement SGMII-based in-band link state
signaling")
changed mvneta_adjust_link() so that it does not clear the auto-negotiation
bits in MVNETA_GMAC_AUTONEG_CONFIG register. This was necessary for
auto-negotiation mode to work.
Unfortunately I haven't checked if these bits are ever initialized.
It appears they are not.
This patch adds the missing initialization of the auto-negotiation bits
in the MVNETA_GMAC_AUTONEG_CONFIG register.
It fixes the following regression:
https://www.mail-archive.com/netdev@vger.kernel.org/msg67928.html

Since the patch was tested to fix a regression, it should be applied to
stable tree.

Tested-by: Arnaud Ebalard <arno@natisbad.org>
CC: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
CC: Florian Fainelli <f.fainelli@gmail.com>
CC: netdev@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: stable@vger.kernel.org
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index ce5f7f9..74176ec 100644 (file)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1013,6 +1013,12 @@ static void mvneta_defaults_set(struct mvneta_port *pp)
                val = mvreg_read(pp, MVNETA_GMAC_CLOCK_DIVIDER);
                val |= MVNETA_GMAC_1MS_CLOCK_ENABLE;
                mvreg_write(pp, MVNETA_GMAC_CLOCK_DIVIDER, val);
+       } else {
+               val = mvreg_read(pp, MVNETA_GMAC_AUTONEG_CONFIG);
+               val &= ~(MVNETA_GMAC_INBAND_AN_ENABLE |
+                      MVNETA_GMAC_AN_SPEED_EN |
+                      MVNETA_GMAC_AN_DUPLEX_EN);
+               mvreg_write(pp, MVNETA_GMAC_AUTONEG_CONFIG, val);
        }
 
        mvneta_set_ucast_table(pp, -1);