netdev - Re: [PATCH v2 00/15] drivers: net: cpsw: improve runtime pm

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Date:	Mon, 27 Jun 2016 14:48:11 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 00/15] drivers: net: cpsw: improve runtime pm

On Friday 24 June 2016 11:53 PM, Grygorii Strashko wrote:
> 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

For the series.
Reviewed-by: Mugunthan V N <mugunthanvnm@...com>

Regards
Mugunthan V N

> 
> 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(-)
>