net/macb: Only adjust tx_clk on link change
authorJaeden Amero <jaeden.amero@ni.com>
Thu, 12 Mar 2015 23:07:54 +0000 (18:07 -0500)
committerDavid S. Miller <davem@davemloft.net>
Fri, 13 Mar 2015 03:04:32 +0000 (23:04 -0400)
commit2c29b2354a06f42493ddd2a5eb65962981e666ed
treec47c4f3b39496f10679fda3d8be3dfe069b544e9
parent393619474ec0ba2a16dee12ec78fd43164f1e9b7
net/macb: Only adjust tx_clk on link change

The PHY state machine (in drivers/net/phy/phy.c) will unconditionally
call phydev->adjust_link (macb_handle_link_change) when polling in the
PHY_CHANGELINK state. As currently written, macb always ends up
requesting a new tx_clk frequency in macb_handle_link_change. It is a
waste of time to request a new tx_clk frequency if the link state hasn't
changed, as the tx_clk will already be configured properly.

Let's only request a new tx_clk clock frequency when necessary.

Signed-off-by: Jaeden Amero <jaeden.amero@ni.com>
Cc: Josh Cartwright <joshc@ni.com>
Cc: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/cadence/macb.c