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/[email protected]/msg67928.html

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

---
 drivers/net/ethernet/marvell/mvneta.c | 6 ++++++
 1 file changed, 6 insertions(+)

index ce5f7f9..74176ec 100644
@@ -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);

1.9.1

From: Stas Sergeev <[email protected]>
Date: Thu, 18 Jun 2015 18:36:03 +0300

Applied, thanks.