netdev - Re: [PATCH] net: fec: Fix PHY init after phy_reset_after_clk

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Date:   Wed, 9 Sep 2020 10:38:13 +0200
From:   Richard Leitner <richard.leitner@...data.com>
To:     Marek Vasut <marex@...x.de>
CC:     Andrew Lunn <andrew@...n.ch>, <netdev@...r.kernel.org>,
        Christoph Niedermaier <cniedermaier@...electronics.com>,
        "David S . Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH] net: fec: Fix PHY init after phy_reset_after_clk_enable()

On Fri, Sep 04, 2020 at 09:23:26PM +0200, Marek Vasut wrote:
> On 9/4/20 9:02 PM, Richard Leitner wrote:
> > On Fri, Sep 04, 2020 at 05:26:14PM +0200, Marek Vasut wrote:
> >> On 9/4/20 4:02 PM, Andrew Lunn wrote:
> >>> On Fri, Sep 04, 2020 at 12:45:44AM +0200, Marek Vasut wrote:
> >>>> On 9/4/20 12:08 AM, Andrew Lunn wrote:
> >>>>>>> b4 am 20200903043947.3272453-1-f.fainelli@...il.com
> >>>>>>
> >>>>>> That might be a fix for the long run, but I doubt there's any chance to
> >>>>>> backport it all to stable, is there ?
> >>>>>
> >>>>> No. For stable we need something simpler.
> >>>>
> >>>> Like this patch ?
> >>>
> >>> Yes.
> >>>
> >>> But i would like to see a Tested-By: or similar from Richard
> >>> Leitner. Why does the current code work for his system? Does your
> >>> change break it?
> >>
> >> I have the IRQ line connected and described in DT. The reset clears the
> >> IRQ settings done by the SMSC PHY driver. The PHY works fine if I use
> >> polling, because then even if no IRQs are generated by the PHY, the PHY
> >> framework reads the status updates from the PHY periodically and the
> >> default settings of the PHY somehow work (even if they are slightly
> >> incorrect). I suspect that's how Richard had it working.
> > 
> > I have different PHYs on different PCBs in use, but IIRC none of them
> > has the IRQ line defined in the DT.
> > I will take a look at it, test your patch and give feedback ASAP.
> > Unfortunately it's unlikely that this will be before monday 😕
> > Hope that's ok.
> 
> That's totally fine, thanks !

Hi, sorry for the delay.
I've applied the patch to our kernel and did some basic tests on
different custom imx6 PCBs. As everything seems to work fine for our
"non-irq configuration" please feel free to add

Tested-by: Richard Leitner <richard.leitner@...data.com>

regards;rl