From: Maxim Kochetkov fido_max@inbox.ru
[ Upstream commit e7679c55a7249f1315256cfc672d53e84072e223 ]
Changing downshift params without software reset has no effect, so call genphy_soft_reset() after change downshift params.
As the datasheet says: Changes to these bits are disruptive to the normal operation therefore, any changes to these registers must be followed by software reset to take effect.
Fixes: 5c6bc5199b5d ("net: phy: marvell: add downshift support for M88E1111") Signed-off-by: Maxim Kochetkov fido_max@inbox.ru Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/marvell.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-)
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c index 723f25f6138d..f86c9ddc609e 100644 --- a/drivers/net/phy/marvell.c +++ b/drivers/net/phy/marvell.c @@ -967,22 +967,28 @@ static int m88e1111_get_downshift(struct phy_device *phydev, u8 *data)
static int m88e1111_set_downshift(struct phy_device *phydev, u8 cnt) { - int val; + int val, err;
if (cnt > MII_M1111_PHY_EXT_CR_DOWNSHIFT_MAX) return -E2BIG;
- if (!cnt) - return phy_clear_bits(phydev, MII_M1111_PHY_EXT_CR, - MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN); + if (!cnt) { + err = phy_clear_bits(phydev, MII_M1111_PHY_EXT_CR, + MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN); + } else { + val = MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN; + val |= FIELD_PREP(MII_M1111_PHY_EXT_CR_DOWNSHIFT_MASK, cnt - 1);
- val = MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN; - val |= FIELD_PREP(MII_M1111_PHY_EXT_CR_DOWNSHIFT_MASK, cnt - 1); + err = phy_modify(phydev, MII_M1111_PHY_EXT_CR, + MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN | + MII_M1111_PHY_EXT_CR_DOWNSHIFT_MASK, + val); + }
- return phy_modify(phydev, MII_M1111_PHY_EXT_CR, - MII_M1111_PHY_EXT_CR_DOWNSHIFT_EN | - MII_M1111_PHY_EXT_CR_DOWNSHIFT_MASK, - val); + if (err < 0) + return err; + + return genphy_soft_reset(phydev); }
static int m88e1111_get_tunable(struct phy_device *phydev,