netdev - RE: lan78xx: WARNING: irq 79 handler enabled interrupts

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Date:   Tue, 1 Jan 2019 22:31:47 +0100 (CET)
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Woojung.Huh@...rochip.com
Cc:     eric@...olt.net, UNGLinuxDriver@...rochip.com,
        marc.zyngier@....com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: RE: lan78xx: WARNING: irq 79 handler enabled interrupts

Hi Woojung,

> Woojung.Huh@...rochip.com hat am 30. Dezember 2018 um 04:25 geschrieben:
> 
> 
> HI Marc & Stephen,
> 
> Most of engineers are out until New Year's Day.

thanks. I didn't expect a reply that fast.

>  
> LAN78xx driver uses irq_domain for phy interrupt, but smsc95xx uses polling.
> Need to check flow again, you can try that comment out "lan78xx_setup_irq_domain" to
> make dev->domain_data.phyirq = 0 which forces PHY polling.

I tested your suggestion with multi_v7_defconfig (32 bit) and arm64/defconfig.
The warning disappeared and Ethernet is still working.

Only the old issue that we can't receive until a first packet has been send out reappear. But this should be manageable.

>  
> Can you share if this is filed on RPI forum?

I didn't submit this to the raspberrypi.org forum / github. They mostly care about the next LTS release 4.19 and not really about arm64.

But an Arch Linux user (aarch64 using Mainline kernel) already discovered this issue:
https://archlinuxarm.org/forum/viewtopic.php?f=65&t=13302

> Also, it would be appreciated if you can create a ticket on Microchip site at
> https://www.microchip.com/technical-support/hot-topics

Done

Best regards
Stefan

> 
> Best Regards,
> Woojung
>