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stmmac: fix DMA channel hang in half-duplex mode

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[ Upstream commit b6cfffa7ad ]

HW does not support Half-duplex mode in multi-queue
scenario. Fix it by not advertising the Half-Duplex
mode if multi-queue enabled.

Signed-off-by: Bhadram Varka <vbhadram@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bhadram Varka 2018-06-17 20:02:05 +05:30 committed by Greg Kroah-Hartman
parent 5e90946baa
commit 32761addd3
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -914,6 +914,7 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
static int stmmac_init_phy(struct net_device *dev)
{
struct stmmac_priv *priv = netdev_priv(dev);
u32 tx_cnt = priv->plat->tx_queues_to_use;
struct phy_device *phydev;
char phy_id_fmt[MII_BUS_ID_SIZE + 3];
char bus_id[MII_BUS_ID_SIZE];
@ -954,6 +955,15 @@ static int stmmac_init_phy(struct net_device *dev)
phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full);
/*
* Half-duplex mode not supported with multiqueue
* half-duplex can only works with single queue
*/
if (tx_cnt > 1)
phydev->supported &= ~(SUPPORTED_1000baseT_Half |
SUPPORTED_100baseT_Half |
SUPPORTED_10baseT_Half);
/*
* Broken HW is sometimes missing the pull-up resistor on the
* MDIO line, which results in reads to non-existent devices returning