drivers: ethernet: phy: KSZ8081 PHY Driver improvements
Added changes required for nxp_enet ethernet driver to work
with multiple PHYs and fixed few problems:
- The cfg_link API resets PHY before configuring link. It was moved
here so the ethernet driver does not have to reset it - not all
PHYs need reset before configuring link and moving the reset code
here makes possible to have the reset done in a PHY specific way
(for example to reset by toggling GPIO pin). It also avoids ethernet
driver touching PHY registers without locking.
- When reset GPIO is not defined, reset is performed by setting reset
bit in control register.
- The cfg_link API does not return error when autonegotiation fails.
This fixes situation when the link is down at system start - ethernet
driver then skipped setting link-change callback and link was never
to be detected again.
- Added reset of excessive bits 16-31 when reading register values.
As only 16 bits are read from PHY, but the API is supposed to read
into uint32_t, the remaining bits contained previous data after
a successful read.
- Fixed missing mutex unlock when querying link state and link was down.
- Added missing initializer to link state variables. This could result
in link state change detection while link was still down, because
the speed/duplex settings could be random and old and new state
could be wrongly detected as different.
- Not logging link speed/duplex status when link is not up.
Signed-off-by: Stanislav Poboril <stanislav.poboril@nxp.com>
1 file changed
