Commit 90174018 authored by Claudiu Manoil's avatar Claudiu Manoil Committed by Thadeu Lima de Souza Cascardo

gianfar: Fix Tx flow control deactivation

BugLink: http://bugs.launchpad.net/bugs/1721477

[ Upstream commit 5d621672 ]

The wrong register is checked for the Tx flow control bit,
it should have been maccfg1 not maccfg2.
This went unnoticed for so long probably because the impact is
hardly visible, not to mention the tangled code from adjust_link().
First, link flow control (i.e. handling of Rx/Tx link level pause frames)
is disabled by default (needs to be enabled via 'ethtool -A').
Secondly, maccfg2 always returns 0 for tx_flow_oldval (except for a few
old boards), which results in Tx flow control remaining always on
once activated.

Fixes: 45b679c9 ("gianfar: Implement PAUSE frame generation support")
Signed-off-by: default avatarClaudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarStefan Bader <stefan.bader@canonical.com>
Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@canonical.com>
parent 29c2b742
......@@ -3676,7 +3676,7 @@ static noinline void gfar_update_link_state(struct gfar_private *priv)
u32 tempval1 = gfar_read(&regs->maccfg1);
u32 tempval = gfar_read(&regs->maccfg2);
u32 ecntrl = gfar_read(&regs->ecntrl);
u32 tx_flow_oldval = (tempval & MACCFG1_TX_FLOW);
u32 tx_flow_oldval = (tempval1 & MACCFG1_TX_FLOW);
if (phydev->duplex != priv->oldduplex) {
if (!(phydev->duplex))
......
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