netdev - Re: Ethernet issue on imx6

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Date: Mon, 16 Oct 2023 15:31:54 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Stephen Hemminger <stephen@...workplumber.org>, Andrew Lunn
 <andrew@...n.ch>, Wei Fang <wei.fang@....com>, Shenwei Wang
 <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>, Russell King
 <linux@...linux.org.uk>, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, linux-imx@....com,
 netdev@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>
Subject: Re: Ethernet issue on imx6

Hi Alexander,

Thanks a lot for your feedback.

> > switch to partitions #0, OK
> > mmc1 is current device
> > reading boot.scr
> > 444 bytes read in 10 ms (43 KiB/s)
> > ## Executing script at 20000000
> > Booting from mmc ...
> > reading zImage
> > 9160016 bytes read in 462 ms (18.9 MiB/s)
> > reading <board>.dtb  
> 
> Which device tree is that?
> 
> > 40052 bytes read in 22 ms (1.7 MiB/s)
> > boot device tree kernel ...
> > Kernel image @ 0x12000000 [ 0x000000 - 0x8bc550 ]
> > ## Flattened Device Tree blob at 18000000
> >    Booting using the fdt blob at 0x18000000
> >    Using Device Tree in place at 18000000, end 1800cc73
> > 
> > Starting kernel ...
> > 
> > [    0.000000] Booting Linux on physical CPU 0x0
> > [    0.000000] Linux version 6.5.0 (mraynal@...-13) (arm-linux-gcc.br_real
> > (Buildroot 2 020.08-14-ge5a2a90) 10.2.0, GNU ld (GNU Binutils) 2.34) #120
> > SMP Thu Oct 12 18:10:20 CE ST 2023
> > [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7),
> > cr=10c5387d [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT
> > aliasing instruction cache
> > [    0.000000] OF: fdt: Machine model: TQ TQMa6Q
> > on MBa6x  
> 
> Your first mail mentions a custom board, but this indicates "TQMa6Q
> on MBa6x", so which is it?

It's a custom carrier board with a TQMA6Q-AA module.

> Please note that there are two different module variants, imx6qdl-tqma6a.dtsi 
> and imx6qdl-tqma6b.dtsi. They deal with i.MX6's ERR006687 differently.
> Package drop without any load somewhat indicates this issue.

I've tried with and without the fsl,err006687-workaround-present DT
property. It gets successfully parsed an I see the lower idle state
being disabled under mach-imx. I've also tried just commenting out the
registration of the cpuidle driver, just to be sure. I saw no
difference.

By the way, we tried with a TQ eval board with this SoM and saw the same
issue (not me, I don't have this board in hands). Don't you experience
something similar? I went across a couple of people reporting similar
issues with these modules but none of them reported how they fixed it
(if they did). I tried two different images based on TQ's Github using
v4.14.69 and v5.10 kernels.

Thanks,
Miquèl