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

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Date:   Sat, 26 Sep 2020 20:52:17 +0200
From:   Marek Vasut <marex@...x.de>
To:     Richard Leitner <richard.leitner@...data.com>
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 9/9/20 10:38 AM, Richard Leitner wrote:
> 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>

So can this fix be applied ?