Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.2 29/30] mvneta: use inband status only when explicitly enabled | Date | Thu, 1 Oct 2015 11:21:51 +0200 |
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4.2-stable review patch. If anyone has any objections, please let me know.
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From: Stas Sergeev <stsp@list.ru>
[ 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
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/marvell/mvneta.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -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)) {
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