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The xpcs_switch_interface_mode function was introduced to handle interface switching. According to the XPCS datasheet, a soft reset is required to initiate Clause 37 auto-negotiation when the XPCS switches interface modes. When the interface mode switches from 2500BASE-X to SGMII, re-initiating Clause 37 auto-negotiation is required for the SGMII interface mode to function properly. Signed-off-by: Choong Yong Liang <yong.liang.choong@linux.intel.com> Link: https://patch.msgid.link/20250227121522.1802832-3-yong.liang.choong@linux.intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>