This series intended to improve runtime PM and allow CPSW to be RPM suspended when all ethX netdevices are down. To achieve above goal it is required to relax runtime PM constraints for Davinci MDIO which blocks CPSW runtime PM now, because Davinci MDIO is always powered on during probe and powered off only when it's going to be removed. - Patches 6-11 implement PM runtime autosuspend for Davinci MDIO, but keep it disabled by default, because Davinci MDIO is integrated in big set of TI devices and not all of them verified to work correctly with RPM autosuspend enabled: expected to work on SoCs where MDIO is defined as part of CPSW in DT (cpsw.c DRA7/am57x, am437x, am335x) The CPSW need to be fixed before RPM suspended can be allowed: - Patches 1-5 ensure that CPSW will not cause L3 errors while it is in RPM suspended state. Davinci MDIO RPM autosuspend can be enabled through sysfs: echo 100 > /sys/devices/../48484000.ethernet/48485000.mdio/power/autosuspend_delay_ms Patches 12 - 15: introduce new compatible string "ti,cpsw-mdio" which is used then to enable RPM for am335x/am437x/dra7 SoCs. Tested on am335x, am437x, am572x and k2g (on k2g with RPM disabled for Davinci MDIO) These changes should not affect on errata i877 implementation on DRA7. Power measurement on am335x GP EVM: Without this series: 547.60 mW total SoC power With this series + "ifconfig eth0 down": 477.32 mW Total Soc Power Changes in v2: - CPSW ethtool interface updated to use .begin()/.complete() callbacks - kbuild failure fixed - davinci_mdio DT updated with proper description of allowed compatible strings combinations Link on v1: https://lkml.org/lkml/2016/6/15/362 Grygorii Strashko (15): drivers: net: cpsw: fix suspend when all ethX devices are down drivers: net: cpsw: check return code from pm runtime calls drivers: net: cpsw: remove pm runtime calls from suspend callbacks drivers: net: cpsw: ethtool: fix accessing to suspended device drivers: net: cpsw: ndev: fix accessing to suspended device drivers: net: davinci_mdio: do pm runtime initialization later in probe drivers: net: davinci_mdio: remove pm runtime calls from suspend callbacks drivers: net: davinci_mdio: drop suspended and lock fields from mdio_data drivers: net: davinci_mdio: split reset function on init_clk and enable drivers: net: davinci_mdio: add pm runtime callbacks drivers: net: davinci_mdio: implement pm runtime auto mode net: davinci_mdio: document missed "ti,am4372-mdio" compat string net: davinci_mdio: introduce "ti,cpsw-mdio" compat string drivers: net: davinci_mdio: enable pm runtime auto for ti cpsw-mdio ARM: dts: am335x/am437x/dra7: use new "ti,cpsw-mdio" compat string .../devicetree/bindings/net/davinci-mdio.txt | 5 +- arch/arm/boot/dts/am33xx.dtsi | 2 +- arch/arm/boot/dts/am4372.dtsi | 2 +- arch/arm/boot/dts/dra7.dtsi | 2 +- drivers/net/ethernet/ti/cpsw.c | 79 ++++++++-- drivers/net/ethernet/ti/davinci_mdio.c | 169 +++++++++++++-------- 6 files changed, 182 insertions(+), 77 deletions(-) -- 2.9.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
