net: phy: marvell: add Marvell specific PHY loopback
Existing genphy_loopback() is not applicable for Marvell PHY. Besides configuring bit-6 and bit-13 in Page 0 Register 0 (Copper Control Register), it is also required to configure same bits in Page 2 Register 21 (MAC Specific Control Register 2) according to speed of the loopback is operating. Tested working on Marvell88E1510 PHY for all speeds (1000/100/10Mbps). FIXME: Based on trial and error test, it seem 1G need to have delay between soft reset and loopback enablement. Fixes: 014068dc ("net: phy: genphy_loopback: add link speed configuration") Cc: <stable@vger.kernel.org> # 5.15.x Signed-off-by:Mohammad Athari Bin Ismail <mohammad.athari.ismail@intel.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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