diff options
| -rw-r--r-- | drivers/net/dsa/vitesse-vsc73xx-core.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c index 07b704a1557e..1711e780e65b 100644 --- a/drivers/net/dsa/vitesse-vsc73xx-core.c +++ b/drivers/net/dsa/vitesse-vsc73xx-core.c @@ -40,6 +40,9 @@ #define VSC73XX_BLOCK_ARBITER 0x5 /* Only subblock 0 */ #define VSC73XX_BLOCK_SYSTEM 0x7 /* Only subblock 0 */ +/* MII Block subblock */ +#define VSC73XX_BLOCK_MII_INTERNAL 0x0 /* Internal MDIO subblock */ + #define CPU_PORT 6 /* CPU port */ /* MAC Block registers */ @@ -224,6 +227,11 @@ #define VSC73XX_MII_STAT 0x0 #define VSC73XX_MII_CMD 0x1 #define VSC73XX_MII_DATA 0x2 +#define VSC73XX_MII_MPRES 0x3 + +#define VSC73XX_MII_MPRES_NOPREAMBLE BIT(6) +#define VSC73XX_MII_MPRES_PRESCALEVAL GENMASK(5, 0) +#define VSC73XX_MII_PRESCALEVAL_MIN 3 /* min allowed mdio clock prescaler */ /* Arbiter block 5 registers */ #define VSC73XX_ARBEMPTY 0x0c @@ -748,7 +756,7 @@ static int vsc73xx_configure_rgmii_port_delay(struct dsa_switch *ds) static int vsc73xx_setup(struct dsa_switch *ds) { struct vsc73xx *vsc = ds->priv; - int i, ret; + int i, ret, val; dev_info(vsc->dev, "set up the switch\n"); @@ -821,6 +829,15 @@ static int vsc73xx_setup(struct dsa_switch *ds) mdelay(50); + /* Disable preamble and use maximum allowed clock for the internal + * mdio bus, used for communication with internal PHYs only. + */ + val = VSC73XX_MII_MPRES_NOPREAMBLE | + FIELD_PREP(VSC73XX_MII_MPRES_PRESCALEVAL, + VSC73XX_MII_PRESCALEVAL_MIN); + vsc73xx_write(vsc, VSC73XX_BLOCK_MII, VSC73XX_BLOCK_MII_INTERNAL, + VSC73XX_MII_MPRES, val); + /* Release reset from the internal PHYs */ vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GLORESET, VSC73XX_GLORESET_PHY_RESET); |