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Date:   Fri, 10 Jan 2020 12:53:05 +0000
From:   Russell King - ARM Linux admin <>
To:     ѽ҉ᶬḳ℠ <>
Cc:     Andrew Lunn <>,
Subject: Re: [drivers/net/phy/sfp] intermittent failure in state machine

On Fri, Jan 10, 2020 at 12:45:52PM +0000, ѽ҉ᶬḳ℠ wrote:
> On 10/01/2020 11:44, Russell King - ARM Linux admin wrote:
> > 
> > Which is also indicating everything is correct.  When the problem
> > occurs, check the state of the signals again as close as possible
> > to the event - it depends how long the transceiver keeps it
> > asserted.  You will probably find tx-fault is indicating
> > "in  hi IRQ".
> just discovered userland - gpioinfo pca9538 - which seems more verbose
> gpiochip2 - 8 lines:
>         line   0:      unnamed   "tx-fault"   input  active-high [used]
>         line   1:      unnamed "tx-disable"  output  active-high [used]
>         line   2:      unnamed "rate-select0" input active-high [used]
>         line   3:      unnamed        "los"   input  active-high [used]
>         line   4:      unnamed   "mod-def0"   input   active-low [used]
>         line   5:      unnamed       unused   input  active-high
>         line   6:      unnamed       unused   input  active-high
>         line   7:      unnamed       unused   input  active-high
> The above is depicting the current state with the module working, i.e. being
> online. Will do some testing and report back, not sure yet how to keep a
> close watch relating to the failure events.

However, that doesn't give the current levels of the inputs, so it's
useless for the purpose I've asked for.

RMK's Patch system:
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to 11.9Mbps down 500kbps up

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