netdev - Re: [PATCH net-next v3 1/2] net: phy: replace PHY_HAS_INTERRUPT with a check for config_intr and ack

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Message-ID: <CAFBinCB3v3tWb5YEjeMe=gHK5Dsu-0ONzn4PEx0s4Y9zrrLA4g@mail.gmail.com>
Date:   Mon, 12 Nov 2018 22:53:45 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     hkallweit1@...il.com
Cc:     f.fainelli@...il.com, andrew@...n.ch, netdev@...r.kernel.org,
        richardcochran@...il.com, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, khilman@...libre.com,
        carlo@...one.org, linux-amlogic@...ts.infradead.org,
        davem@...emloft.net, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v3 1/2] net: phy: replace PHY_HAS_INTERRUPT with
 a check for config_intr and ack_interrupt

On Mon, Nov 12, 2018 at 9:38 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> On 12.11.2018 21:32, Martin Blumenstingl wrote:
> > Hi Heiner,
> >
> > On Fri, Nov 9, 2018 at 9:56 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
> >>
> >> On 09.11.2018 21:33, Florian Fainelli wrote:
> >>> On 11/9/18 12:22 PM, Heiner Kallweit wrote:
> >>>> On 09.11.2018 21:13, Andrew Lunn wrote:
> >>>>> Hi Heiner
> >>>>>
> >>>>>> +static bool phy_drv_supports_irq(struct phy_driver *phydrv)
> >>>>>> +{
> >>>>>> +  return phydrv->config_intr || phydrv->ack_interrupt;
> >>>>>> +}
> >>>>>
> >>>>> Should this be && not || ? I thought both needed to be provided for
> >>>>> interrupts to work.
> >>>>>
> >>>>>        Andrew
> >>>>>
> >>>> I've seen at least one driver which configures interrupts in
> >>>> config_init and doesn't define a config_intr callback
> >>>> (ack_interrupt callback is there)
> >>>
> >>> That driver should probably be fixed, while it most likely does not make
> >>> any significant difference during probe/connect, since config_init() and
> >>> config_intr() are virtually happening at the same time, this is not
> >>> necessarily true when disconnecting from the PHY where we really want
> >>> config_intr() to effectively disable the interrupts and not leaving
> >>> something enabled that would now become unmaskable, because no more
> >>> driver attached.
> >>>
> >> Found the driver: It's the IP101A/G in icplus.c
> >> It should be easy to fix the behavior and move the interrupt config
> >> to a config_intr callback. But the last real changes to the driver
> >> have been done 6 years ago, so I'm not sure there's anybody out
> >> there who can test.
> > if you want I can take care of the IP101A/G code.
> > I have at least one board with an IP101A/G (PHY ID: 0x02430c54,
> > according to the schematics it's an IP101GR-GP) where the interrupt is
> > routed to the SoC.
> >
> > please let me know whether you'd like to work on it or if I should
> > give it a try.
> >
> I made the change already based on the datasheet of IP101A LF which
> is supposed to be register-compatible with IP101A/G.
> The patch is not applied yet, you can find it in the mailing
> list archive or in patchwork. Would be great if you could test it
> and report problems or add a Tested-by.
I will test it but I doubt it works out-of-the-box in my setup:
my board routes the RXER/INTR_32 pin of the IP101GR to the SoC. that
pin defaults to "RXER" (receive error signal). so I need to come up
with some extra patches which toggle the bit to output the interrupt
signal on that pin

in other words: I'll give your patches a try as soon as I have time
and give my Tested-by along with my extra patches on top of yours.


Regards
Martin