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Implement the workaround for erratum 3.3 RGMII timing may be out of spec when transmit delay is enabled for the 6320 family, which says: When transmit delay is enabled via Port register 1 bit 14 = 1, duty cycle may be out of spec. Under very rare conditions this may cause the attached device receive CRC errors. Signed-off-by: Marek Behún <kabel@kernel.org> Cc: <stable@vger.kernel.org> # 5.4.x Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20250317173250.28780-8-kabel@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>