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

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Date:   Fri, 4 Sep 2020 17:26:14 +0200
From:   Marek Vasut <marex@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org,
        Christoph Niedermaier <cniedermaier@...electronics.com>,
        "David S . Miller" <davem@...emloft.net>,
        NXP Linux Team <linux-imx@....com>,
        Richard Leitner <richard.leitner@...data.com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH] net: fec: Fix PHY init after phy_reset_after_clk_enable()

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.