netdev - Re: ravb: Possible Regression In "net: phy: Avoid polling PHY with PHY_IGNORE

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Message-ID: <CAMuHMdXvnY0i69jSfxk_2K0Ac0PtjF7G7QMXKOh6KOLQE8MsMg@mail.gmail.com>
Date:	Tue, 16 Feb 2016 08:42:04 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: ravb: Possible Regression In "net: phy: Avoid polling PHY with PHY_IGNORE_INTERRUPTS"

Hi Simon,

On Tue, Feb 16, 2016 at 4:26 AM, Simon Horman <horms@...ge.net.au> wrote:
> I have observed what appears to be a regression in the ravb ethernet driver
> caused by d5c3d84657db ("net: phy: Avoid polling PHY with
> PHY_IGNORE_INTERRUPTS").
>
> When booting net-next configured with the ARM64 defconfig on the Renesas
> r8a7795/salvator-x I see the following and the ravb is unable to access the
> network. With the above mentioned patch reverted I am able to boot to
> user-space using nfsroot.

The ravb interrupt is connected to a GPIO controller, which is
runtime-suspended and thus not serving the interrupt.

Cfr. "[PATCH/RFC] gpio: rcar: Add Runtime PM handling for interrupts"
(http://www.spinics.net/lists/linux-renesas-soc/msg00532.html).

I assume it worked before as the PHY driver polled the PHY instead of relying
solely on the interrupt.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds