Hi all,

I'm working on adding u-boot support for boards based on i.MX6ULL SoC. One board has a shared MDIO (CONFIG_FEC_MXC_SHARE_MDIO=y).

U-Boot 2021.04-00002-gb199ac910c-dirty (May 02 2021 - 01:03:13 +0300)

I've found a weird race condition in phy_find_by_mask() function. During the cold boot, it's don't initialize properly:

Net: Warning: ethernet@20b4000 (eth1) using random MAC address - 9e:55:17:69:4a:cb eth1: ethernet@20b4000Get shared mii bus on ethernet@2188000 Could not get PHY for FEC1: addr 0

Everything initializes properly If I perform hot boot:

Net: Warning: ethernet@20b4000 (eth1) using random MAC address - f6:cc:65:df:9d:99 eth1: ethernet@20b4000Get shared mii bus on ethernet@2188000

Warning: ethernet@2188000 (eth0) using random MAC address - 16:1b:89:80:44:8e , eth0: ethernet@2188000

After some debugging, I've change phy_find_by_mask(): diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index 89e3076bfd..5dfc8cba37 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -914,12 +914,11 @@ struct phy_device *phy_find_by_mask(struct mii_dev *bus, uint phy_mask, phy_interface_t interface) { /* Reset the bus */ - if (bus->reset) { + if (bus->reset) bus->reset(bus);

- /* Wait 15ms to make sure the PHY has come out of hard reset */ - mdelay(15); - } + /* Wait 15ms to make sure the PHY has come out of hard reset */ + mdelay(15);

return get_phy_device_by_mask(bus, phy_mask, interface); }

Any ideas on how to fix this issue properly? Or patch above is good enough to be merged into the u-boot source tree?