[PATCH net-next 10/13] net: dsa: mv88e6xxx: Power on/off SERDES on cmode change

[Andrew Lunn]

The 6390 family has a number of SERDES interfaces per port. When the
cmode changes, eg 1000Base-X to XAUI, the SERDES interface in use will
also change. Power down the old SERDES interface and power up the new
SERDES interface.

Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
 drivers/net/dsa/mv88e6xxx/port.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index d236f3420f2d..977b4cb82299 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -19,6 +19,7 @@
 
 #include "chip.h"
 #include "port.h"
+#include "serdes.h"
 
 int mv88e6xxx_port_read(struct mv88e6xxx_chip *chip, int port, int reg,
                        u16 *val)
@@ -372,6 +373,10 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, 
int port,
                cmode = 0;
        }
 
+       err = mv88e6390_serdes_power(chip, port, false);
+       if (err)
+               return err;
+
        if (cmode) {
                err = mv88e6xxx_port_read(chip, port, MV88E6XXX_PORT_STS, &reg);
                if (err)
@@ -383,6 +388,10 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, 
int port,
                err = mv88e6xxx_port_write(chip, port, MV88E6XXX_PORT_STS, reg);
                if (err)
                        return err;
+
+               err = mv88e6390_serdes_power(chip, port, true);
+               if (err)
+                       return err;
        }
 
        chip->ports[port].cmode = cmode;
-- 
2.18.0