linux-kernel - Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error interrupts unmasking

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Date: Mon, 13 May 2024 16:04:54 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Ramón Nordin Rodriguez <ramon.nordin.rodriguez@...roamp.se>
Cc: Piergiorgio Beruto <Pier.Beruto@...emi.com>,
	"Parthiban.Veerasooran@...rochip.com" <Parthiban.Veerasooran@...rochip.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"horms@...nel.org" <horms@...nel.org>,
	"saeedm@...dia.com" <saeedm@...dia.com>,
	"anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"corbet@....net" <corbet@....net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"Horatiu.Vultur@...rochip.com" <Horatiu.Vultur@...rochip.com>,
	"ruanjinjie@...wei.com" <ruanjinjie@...wei.com>,
	"Steen.Hegelund@...rochip.com" <Steen.Hegelund@...rochip.com>,
	"vladimir.oltean@....com" <vladimir.oltean@....com>,
	"UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
	"Thorsten.Kummermehr@...rochip.com" <Thorsten.Kummermehr@...rochip.com>,
	Selvamani Rajagopal <Selvamani.Rajagopal@...emi.com>,
	"Nicolas.Ferre@...rochip.com" <Nicolas.Ferre@...rochip.com>,
	"benjamin.bigler@...nformulastudent.ch" <benjamin.bigler@...nformulastudent.ch>
Subject: Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error
 interrupts unmasking

> Good input. I'll add some instrumentation/stats for how many jiffies
> have elapsed between releases of the worker thread and for the irq
> handler. I can probably find a gpio to toggle as well if it's really
> tight timings.

What might be more interesting is the interrupt status registers. Is
there a bit always set which the driver is not clearly correctly?

You can try printing the values. But that might upset the timing so
you cannot reproduce the issue.

If the printk() does upset the timing, what i have done before is
allocate an array of u32 values. Write the interrupt status into it,
looping around when you get to the end of the array. And then use
debugfs_create_u32_array() to export the array in /sys/kernel/debugfs.
Trigger the problem and then look at the values.

> > Is this your dual device board? Do you have both devices on the same
> > SPI bus? Do they share interrupt lines?
> > 
> 
> It's on the dual device board, the macphys are using separate spi buses,
> one chip shares the bus with another spi device, but the other is the
> only tenant on the bus.
> 
> No device shares an irq line.

I was just wondering how your setup differs so you can trigger the
issue, but others have not been able to reproduce it. It might be
another clue as to what is going on. I don't think you need to do
anything with respect to this, its just information to keep in mind.

	Andrew