During the interface mode change, the 'phylink_major_config' function will be triggered in phylink. The modification of the following functions will support the switching between SGMII and 2500BASE-X interface modes for the Intel platform: - xpcs_switch_interface_mode: Re-initiates clause 37 auto-negotiation for the SGMII interface mode to perform auto-negotiation. - mac_finish: Configures the SerDes according to the interface mode. With the above changes, the code will work as follows during the interface mode change. The PCS will reconfigure according to the pcs_neg_mode and the selected interface mode. Then, the MAC driver will perform SerDes configuration in 'mac_finish' based on the selected interface mode. During the SerDes configuration, the selected interface mode will identify TSN lane registers from FIA and then send IPC commands to the Power Management Controller (PMC) through the PMC driver/API. The PMC will act as a proxy to program the PLL registers. Change log: v1 -> v2: - Add static to pmc_lpm_modes declaration - Add cur_link_an_mode to the kernel doc - Combine 2 commits i.e. "stmmac: intel: Separate driver_data of ADL-N from TGL" and "net: stmmac: Add 1G/2.5G auto-negotiation support for ADL-N" into 1 commit. v2 -> v3: - Create `pmc_ipc.c` file for `intel_pmc_ipc()` function and allocate the file in `arch/x86/platform/intel/` directory. - Update phylink's AN mode during phy interface change and not exposing phylink's AN mode into phylib. v3 -> v4: - Introduce `allow_switch_interface` flag to have all ethtool link modes that are supported and advertised will be published. - Introduce `mac_get_pcs_neg_mode` function that selects the PCS negotiation mode according to the interface mode. - Remove pcs-xpcs.c changes and handle pcs during `mac_select_pcs` function - Configure SerDes base on the interface on `mac_finish` function. v4 -> v5: - remove 'allow_switch_interface' related patches. - remove 'mac_select_pcs' related patches. - add a soft reset according to XPCS datasheet for re-initiate Clause 37 auto-negotiation when switching to SGMII interface mode. v5 -> v6: - Remove 'mac_get_pcs_neg_mode' related patches. The pcs_neg_mode is properly handled by the 'net: add negotiation of in-band capabilities' patch series: https://patchwork.kernel.org/project/netdevbpf/cover/Z08kCwxdkU4n2V6x@xxxxxxxxxxxxxxxxxxxxx/ - Using act_link_an_mode to determine PHY, as cfg_link_an_mode was not updated for the 2500BASE-X interface mode, caused a failure to link up. - Clean up and standardize the interface mode switch for xpcs. v1: https://patchwork.kernel.org/project/netdevbpf/cover/20230622041905.629430-1-yong.liang.choong@xxxxxxxxxxxxxxx/ v2: https://patchwork.kernel.org/project/netdevbpf/cover/20230804084527.2082302-1-yong.liang.choong@xxxxxxxxxxxxxxx/ v3: https://patchwork.kernel.org/project/netdevbpf/cover/20230921121946.3025771-1-yong.liang.choong@xxxxxxxxxxxxxxx/ v4: https://patchwork.kernel.org/project/netdevbpf/cover/20240129130253.1400707-1-yong.liang.choong@xxxxxxxxxxxxxxx/ v5: https://patchwork.kernel.org/project/netdevbpf/cover/20240215030500.3067426-1-yong.liang.choong@xxxxxxxxxxxxxxx/ Choong Yong Liang (6): net: phylink: use act_link_an_mode to determine PHY net: pcs: xpcs: re-initiate clause 37 Auto-negotiation stmmac: intel: configure SerDes according to the interface mode net: stmmac: configure SerDes on mac_finish stmmac: intel: interface switching support for EHL platform stmmac: intel: interface switching support for ADL-N platform David E. Box (1): arch: x86: add IPC mailbox accessor function and add SoC register access MAINTAINERS | 2 + arch/x86/Kconfig | 9 + arch/x86/platform/intel/Makefile | 1 + arch/x86/platform/intel/pmc_ipc.c | 75 ++++++++ drivers/net/ethernet/stmicro/stmmac/Kconfig | 2 + .../net/ethernet/stmicro/stmmac/dwmac-intel.c | 173 +++++++++++++++++- .../net/ethernet/stmicro/stmmac/dwmac-intel.h | 81 ++++++++ .../net/ethernet/stmicro/stmmac/stmmac_main.c | 13 ++ drivers/net/pcs/pcs-xpcs-wx.c | 4 +- drivers/net/pcs/pcs-xpcs.c | 60 +++++- drivers/net/phy/phylink.c | 10 +- .../linux/platform_data/x86/intel_pmc_ipc.h | 34 ++++ include/linux/stmmac.h | 3 + 13 files changed, 450 insertions(+), 17 deletions(-) create mode 100644 arch/x86/platform/intel/pmc_ipc.c create mode 100644 include/linux/platform_data/x86/intel_pmc_ipc.h -- 2.34.1
