[PATCH net-next 0/2] net: pcs: xpcs: fix operating mode selection

[Alex Elder <elder@riscstar.com>]

The XPCS found on Toshiba TC9564 is unable to operate at 2500base-X
and slower with a PHY connected using SGMII/2500base-X.  This XPCS
supports 10Gbase-R, which is the default operating mode, and this
causes mode selection to fail for slower interfaces (SGMII, 1000baseX,
and 2500baseX).  Writing a reserved value to the MDIO_CTRL2 register
avoids this failure.

Wangxun already addresses a similar scenario, but includes custom
quirk handling.

This series implements handling for slower rates for an XPCS that
supports 10Gbase-R.  The first patch rearranges code that performs
soft reset so that it is done *before* the interface mode is
switched.  The second adds code to xpcs_switch_interface_mode()
to update the MDIO_CTRL2 register for interfaces that support
10Gbase-R so that the desired rate change works as intended.

					-Alex

Daniel Thompson (2):
  net: pcs: xpcs: re-order xpcs_pre_config() to update after the reset
  net: pcs: xpcs: select operating mode for 10G-baseR capable PCS

 drivers/net/pcs/pcs-xpcs.c | 94 +++++++++++++++++++++++++++-----------
 1 file changed, 67 insertions(+), 27 deletions(-)


base-commit: 05b5019b01fb9443b09ae4ed34af1135a80a84c8
-- 
2.53.0