Messages in this thread |  | | From | Florian Fainelli <> | Date | Thu, 5 Dec 2013 16:02:53 -0800 | Subject | Re: [PATCH RFCv2 5/6] net: phy: suspend unused PHYs on mdio_bus in late_initcall |
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2013/12/4 Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>: > Since phy_attach ensures PHYs are resumed, we can now suspend all > PHYs that have no attached netdev after initcalls. > > Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> > --- > Changelog: > RFCv1->RFCv2: > - only check for phydev->attached_dev and let phy_suspend decide on > performing suspend or not (Suggested by Florian) > > @Florian: You suggested to 'make sure that the MDIO bus suspend policy > was set to "auto"'. I wasn't able to find any clue how to check that, > so I ignored that for now.
I was looking at the sysfs knob which controls the auto suspend policy, but I am not sure myself how to query that from the kernel, so let's just forget about it.
> > Cc: David Miller <davem@davemloft.net> > Cc: Florian Fainelli <f.fainelli@gmail.com> > Cc: Mugunthan V N <mugunthanvnm@ti.com> > Cc: netdev@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > --- > drivers/net/phy/mdio_bus.c | 25 +++++++++++++++++++++++++ > 1 files changed, 25 insertions(+), 0 deletions(-) > > diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c > index 5617876..f533d17 100644 > --- a/drivers/net/phy/mdio_bus.c > +++ b/drivers/net/phy/mdio_bus.c > @@ -320,6 +320,31 @@ static int mdio_bus_match(struct device *dev, struct device_driver *drv) > (phydev->phy_id & phydrv->phy_id_mask)); > } > > +static int mdio_bus_suspend_unused(struct device *busdev, void *data) > +{ > + struct mii_bus *bus = to_mii_bus(busdev); > + struct phy_device *phydev; > + int i; > + > + for (i = 0; i < PHY_MAX_ADDR; i++) { > + if (!bus->phy_map[i]) > + continue; > + > + phydev = to_phy_device(&bus->phy_map[i]->dev); > + if (!phydev->attached_dev) > + phy_suspend(phydev); > + } > + > + return 0; > +} > + > +static int mdio_bus_class_suspend_unused(void) > +{ > + return class_for_each_device(&mdio_bus_class, NULL, NULL, > + mdio_bus_suspend_unused); > +} > +late_initcall_sync(mdio_bus_class_suspend_unused); > + > #ifdef CONFIG_PM > > static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) > -- > 1.7.2.5 >
-- Florian
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