diff options
| author | Jiawen Wu <jiawenwu@trustnetic.com> | 2023-07-19 17:22:33 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-07-23 11:47:07 +0100 |
| commit | c7b75bea853daeb64fc831dbf39a6bbabcc402ac (patch) | |
| tree | 3dea2dd6692a3b02ccecbf63d792c4449dfcc751 | |
| parent | 32ad45b76990ece9c5dd1fe7aae6e688c3baa647 (diff) | |
net: phy: marvell10g: fix 88x3310 power up
Clear MV_V2_PORT_CTRL_PWRDOWN bit to set power up for 88x3310 PHY,
it sometimes does not take effect immediately. And a read of this
register causes the bit not to clear. This will cause mv3310_reset()
to time out, which will fail the config initialization. So add a delay
before the next access.
Fixes: c9cc1c815d36 ("net: phy: marvell10g: place in powersave mode at probe")
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/phy/marvell10g.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c index 55d9d7acc32e..d4bb90d76881 100644 --- a/drivers/net/phy/marvell10g.c +++ b/drivers/net/phy/marvell10g.c @@ -328,6 +328,13 @@ static int mv3310_power_up(struct phy_device *phydev) ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL, MV_V2_PORT_CTRL_PWRDOWN); + /* Sometimes, the power down bit doesn't clear immediately, and + * a read of this register causes the bit not to clear. Delay + * 100us to allow the PHY to come out of power down mode before + * the next access. + */ + udelay(100); + if (phydev->drv->phy_id != MARVELL_PHY_ID_88X3310 || priv->firmware_ver < 0x00030000) return ret; |