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mvneta: use inband status only when explicitly enabled

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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

Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net>

CC: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
CC: netdev@vger.kernel.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stas Sergeev 2015-07-20 17:49:58 -07:00 committed by David S. Miller
parent 4cba5c2103
commit f8af8e6eb9
1 changed files with 5 additions and 4 deletions
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9
drivers/net/ethernet/marvell/mvneta.c
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@ -3029,8 +3029,8 @@ static int mvneta_probe(struct platform_device *pdev)
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_device *pdev)
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_device *pdev)
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)) {