net: phy: dp83867: add TI PHY loopback
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.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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