net: phy: dp83867: add TI PHY loopback

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The existing genphy_loopback() is not working for TI DP83867 PHY as it
will disable autoneg support while another side is still enabling autoneg.
This is causing the link is not established and results in timeout error
in genphy_loopback() function.

Thus, based on TI PHY datasheet, introduce a TI PHY loopback function by
just configuring BMCR_LOOPBACK(Bit-9) in MII_BMCR register (0x0).

Tested working on TI DP83867 PHY for all speeds (10/100/1000Mbps).

Signed-off-by: Tan Tee Min <tee.min.tan@linux.intel.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20221108101527.612723-1-michael.wei.hong.sit@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Tan Tee Min 2022-11-08 18:15:27 +08:00 • committed by Jakub Kicinski

parent 470765e4e1

commit 13bd85580b

1 changed files with 7 additions and 0 deletions

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drivers/net/phy/dp83867.c

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