Patch "mvneta: use inband status only when explicitly enabled" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

mvneta: use inband status only when explicitly enabled

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mvneta-use-inband-status-only-when-explicitly-enabled.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Stas Sergeev <[email protected]>
Date: Mon, 20 Jul 2015 17:49:58 -0700
Subject: mvneta: use inband status only when explicitly enabled

From: Stas Sergeev <[email protected]>

[ Upstream commit f8af8e6eb95093d5ce5ebcc52bd1929b0433e172 in net-next tree,
will be pushed to Linus very soon. ]

The commit 898b2970e2c9 ("mvneta: implement SGMII-based in-band link state signaling") implemented the link parameters auto-negotiation unconditionally. Unfortunately it appears that some HW that implements SGMII protocol, doesn't generate the inband status, so it is not possible to auto-negotiate anything with such HW.

This patch enables the auto-negotiation only if explicitly requested with the 'managed' DT property.

This patch fixes the following regression:
https://lkml.org/lkml/2015/7/8/865

---
 drivers/net/ethernet/marvell/mvneta.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

@@ -3029,8 +3029,8 @@ static int mvneta_probe(struct platform_
 	const char *dt_mac_addr;
 	char hw_mac_addr[ETH_ALEN];
 	const char *mac_from;
+	const char *managed;
 	int phy_mode;
-	int fixed_phy = 0;
 	int err;
 
 	/* Our multiqueue support is not complete, so for now, only

@@ -3064,7 +3064,6 @@ static int mvneta_probe(struct platform_
 			dev_err(&pdev->dev, "cannot register fixed PHY\n");
 			goto err_free_irq;
 		}
-		fixed_phy = 1;
 
 		/* In the case of a fixed PHY, the DT node associated
 		 * to the PHY is the Ethernet MAC DT node.

@@ -3088,8 +3087,10 @@ static int mvneta_probe(struct platform_
 	pp = netdev_priv(dev);
 	pp->phy_node = phy_node;
 	pp->phy_interface = phy_mode;
-	pp->use_inband_status = (phy_mode == PHY_INTERFACE_MODE_SGMII) &&
-				fixed_phy;
+
+	err = of_property_read_string(dn, "managed", &managed);
+	pp->use_inband_status = (err == 0 &&
+				 strcmp(managed, "in-band-status") == 0);
 
 	pp->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(pp->clk)) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/net-phy-fixed_phy-handle-link-down-case.patch queue-4.2/of_mdio-add-new-dt-property-managed-to-specify-the-phy-management-type.patch queue-4.2/mvneta-use-inband-status-only-when-explicitly-enabled.patch