From: Praneeth Bajjuri praneeth@ti.com
stable inclusion from stable-5.10.47 commit 47c07f919fabb6fc8b3c27ad985f24648f5fd6df bugzilla: 172973 https://gitee.com/openeuler/kernel/issues/I4DAKB
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit da9ef50f545f86ffe6ff786174d26500c4db737a ]
Current logic is performing hard reset and causing the programmed registers to be wiped out.
as per datasheet: https://www.ti.com/lit/ds/symlink/dp83867cr.pdf 8.6.26 Control Register (CTRL)
do SW_RESTART to perform a reset not including the registers, If performed when link is already present, it will drop the link and trigger re-auto negotiation.
Signed-off-by: Praneeth Bajjuri praneeth@ti.com Signed-off-by: Geet Modi geet.modi@ti.com Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/net/phy/dp83867.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c index 69d3eacc2b96..c716074fdef0 100644 --- a/drivers/net/phy/dp83867.c +++ b/drivers/net/phy/dp83867.c @@ -792,16 +792,12 @@ static int dp83867_phy_reset(struct phy_device *phydev) { int err;
- err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESET); + err = phy_write(phydev, DP83867_CTRL, DP83867_SW_RESTART); if (err < 0) return err;
usleep_range(10, 20);
- /* After reset FORCE_LINK_GOOD bit is set. Although the - * default value should be unset. Disable FORCE_LINK_GOOD - * for the phy to work properly. - */ return phy_modify(phydev, MII_DP83867_PHYCTRL, DP83867_PHYCR_FORCE_LINK_GOOD, 0); }