linux-kernel - Re: [PATCH] net: phy: add suspend

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Message-ID: <20140224193939.GD29288@lunn.ch>
Date:	Mon, 24 Feb 2014 20:39:39 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: phy: add suspend_halted module param

On Mon, Feb 24, 2014 at 11:37:15AM -0800, Florian Fainelli wrote:
> 2014-02-24 11:15 GMT-08:00 Andrew Lunn <andrew@...n.ch>:
> > On Sun, Feb 23, 2014 at 05:58:39PM +0100, Sebastian Hesselbarth wrote:
> >> commit 1211ce53077164e0d34641d0ca5fb4d4a7574498
> >>   ("net: phy: resume/suspend PHYs on attach/detach")
> >> introduced a feature to suspend PHYs when entering halted state.
> >>
> >> Unfortunately, not all bootloaders properly power-up PHYs on reset
> >> and fail to access ethernet because the PHY is still powered down.
> >>
> >> Therefore, we add a boolean module parameter suspend_halted with
> >> default value of true. Disabling that parameter prevents PHYs from
> >> being suspended when entering halted state.
> >
> > Hi Sebastian
> >
> > Am i doing something silly here?
> 
> Could the PHY be already suspended during your initial boot?

No. I tftpboot.

> If that
> is the case, the first time we all phy_suspend() the flag is true, we
> suspend it, and we never wake it again despite changing
> suspend_halted. Does it work better if you specify this module
> parameter on the initial kernel boot command-line?

I tried that as well, after i emailed. Makes no difference, no working
Ethernet.

	Andrew
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