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Fix missing PHY-to-MAC RX clock
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[net-next,v2,0/7] Fix missing PHY-to-MAC RX clock
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[net-next,v2,1/7] net: phy: add PHY_F_RXC_ALWAYS_ON to PHY dev flags
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[net-next,v2,2/7] net: phy: add rxc_always_on flag to phylink_pcs
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[net-next,v2,3/7] net: stmmac: don't rely on lynx_pcs presence to check for a PHY
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[net-next,v2,4/7] net: stmmac: Support a generic PCS field in mac_device_info
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[net-next,v2,5/7] net: stmmac: Signal to PHY/PCS drivers to keep RX clock on
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[net-next,v2,6/7] net: phy: at803x: Avoid hibernating if MAC requires RX clock
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[net-next,v2,7/7] net: pcs: rzn1-miic: Init RX clock early if MAC requires it
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Hello everyone, This is version two of my series that addresses the issue with some MAC/PHY combinations. Version one was sent on net, not net-next. Notable changes in v2: - Introduced a pcs op for initializing hardware required for MAC initialization, instead of using phylink_validate() for this purpose. - Refactored stmmac to use a generic PCS reference in mac_device_info instead of a model-specific field. There is an issue with some stmmac/PHY combinations that has been reported some time ago in a couple of different series: Clark Wang's report: https://lore.kernel.org/all/20230202081559.3553637-1-xiaoning.wang@nxp.com/ Clément Léger's report: https://lore.kernel.org/linux-arm-kernel/20230116103926.276869-4-clement.leger@bootlin.com/ Stmmac controllers require an RX clock signal from the MII bus to perform their hardware initialization successfully. This causes issues with some PHY/PCS devices. If these devices do not bring the clock signal up before the MAC driver initializes its hardware, then said initialization will fail. This can happen at probe time or when the system wakes up from a suspended state. This series introduces new flags for phy_device and phylink_pcs. These flags allow MAC drivers to signal to PHY/PCS drivers that the RX clock signal should be enabled as soon as possible, and that it should always stay enabled. I have included specific uses of these flags that fix the RZN1 GMAC1 stmmac driver that I am currently working on and that is not yet upstream. I have also included changes to the at803x PHY driver that should fix the issue that Clark Wang was having. Clark, could you please confirm that this series fixes your issue with the at803x PHY? Best Regards, Romain Romain Gantois (2): net: phy: add rxc_always_on flag to phylink_pcs net: pcs: rzn1-miic: Init RX clock early if MAC requires it Russell King (3): net: phy: add PHY_F_RXC_ALWAYS_ON to PHY dev flags net: stmmac: Signal to PHY/PCS drivers to keep RX clock on net: phy: at803x: Avoid hibernating if MAC requires RX clock .../net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +++++ drivers/net/pcs/pcs-rzn1-miic.c | 18 +++++++++++++----- drivers/net/phy/at803x.c | 3 ++- drivers/net/phy/phylink.c | 13 ++++++++++++- include/linux/phy.h | 1 + include/linux/phylink.h | 9 +++++++++ 6 files changed, 42 insertions(+), 7 deletions(-) -- 2.43.0 --- Maxime Chevallier (1): net: stmmac: don't rely on lynx_pcs presence to check for a PHY Romain Gantois (4): net: phy: add rxc_always_on flag to phylink_pcs net: stmmac: Support a generic PCS field in mac_device_info net: stmmac: Signal to PHY/PCS drivers to keep RX clock on net: pcs: rzn1-miic: Init RX clock early if MAC requires it Russell King (2): net: phy: add PHY_F_RXC_ALWAYS_ON to PHY dev flags net: phy: at803x: Avoid hibernating if MAC requires RX clock drivers/net/ethernet/stmicro/stmmac/common.h | 2 +- .../net/ethernet/stmicro/stmmac/dwmac-socfpga.c | 8 ++++---- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 15 ++++++++------ drivers/net/pcs/pcs-rzn1-miic.c | 16 +++++++++++++++ drivers/net/phy/at803x.c | 3 ++- drivers/net/phy/phylink.c | 24 +++++++++++++++++++++- include/linux/phy.h | 1 + include/linux/phylink.h | 15 ++++++++++++++ 8 files changed, 71 insertions(+), 13 deletions(-) --- base-commit: 795a7dfbc3d95e4c7c09569f319f026f8c7f5a9c change-id: 20240126-rxc_bugfix-d47b3b1a374f Best regards,