linux

iv/linux

History

Nimrod Andy 91c0d987a9 net: fec: ptp: avoid register access when ipg clock is disabled

The current kernel hang on i.MX6SX with rootfs mount from MMC.
The root cause is that ptp uses a periodic timer to access enet register
even if ipg clock is disabled.

FEC ptp driver start one period timer to read 1588 counter register in the
ptp init function that is called after FEC driver is probed.

To save power, after FEC probe finish, FEC driver disable all clocks including
ipg clock that is needed for register access.

i.MX5x, i.MX6q/dl/sl FEC register access don't cause system hang when ipg clock
is disabled, just return zero value. But for i.MX6sx SOC, it cause system hang.

To avoid the issue, we need to check ptp clock status before ptp timer count access.

Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2014-08-22 10:45:56 -07:00

fs_enet

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2014-08-13 18:27:40 -06:00

fec_main.c

net: fec: ptp: avoid register access when ipg clock is disabled

2014-08-22 10:45:56 -07:00

fec_mpc52xx_phy.c

net: fec_mpc52xx_phy: remove unnecessary dev_set_drvdata()

2013-08-21 12:27:04 -07:00

fec_mpc52xx.c

fec_mpc52xx: delete unneeded test before of_node_put