From: root <root@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> During the interface mode change, the 'phylink_major_config' function will be triggered in phylink. The modification of the following functions will be triggered to support the switching between SGMII and 2500BASEX interfaces mode for the Intel platform. - mac_get_pcs_neg_mode: A new function that selects the PCS negotiation mode according to the interface mode. - xpcs_do_config: Re-initiate clause 37 auto-negotiation for 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 and PCS negotiation mode will be selected for PCS configuration according to the interface mode. Then, the MAC driver will perform SerDes configuration on the 'mac_finish' based on the 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. 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. Choong Yong Liang (7): net: phylink: provide mac_get_pcs_neg_mode() function net: phylink: add phylink_pcs_neg_mode() declaration into phylink.h net: stmmac: select PCS negotiation mode according to the interface mode net: pcs: xpcs: re-initiate clause 37 Auto-negotiation 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 Tan, Tee Min (1): stmmac: intel: configure SerDes according to the interface mode 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 | 233 ++++++++++++++++-- .../net/ethernet/stmicro/stmmac/dwmac-intel.h | 81 ++++++ .../net/ethernet/stmicro/stmmac/stmmac_main.c | 30 +++ drivers/net/pcs/pcs-xpcs.c | 62 ++++- drivers/net/phy/phylink.c | 21 +- include/linux/phylink.h | 8 + .../linux/platform_data/x86/intel_pmc_ipc.h | 34 +++ include/linux/stmmac.h | 5 + 13 files changed, 538 insertions(+), 25 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