netdev - Re: KSZ8795 not detected at start to boot from NFS

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Message-ID: <phab74r5xxbufhe6llruqa3tgkxzalytgzqrko4o2bg2xzizjv@apha3we342xn>
Date: Sat, 7 Dec 2024 22:07:23 +0100
From: Jörg Sommer <joerg@...so.de>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, Christian Eggers <ceggers@...i.de>
Subject: Re: KSZ8795 not detected at start to boot from NFS

Andrew Lunn schrieb am Sa 07. Dez, 21:47 (+0100):
> On Sat, Dec 07, 2024 at 08:53:38AM +0100, Jörg Sommer wrote:
> > It tries to initialize the switch before the ethernet of the SoC is ready.
> > 
> > Before this commit the kernel returned EPROBE_DEFER instead of EINVAL (or
> > ENODEV) as a quick
> 
> This is often true for DSA switches, that the first probe fails with
> EPROBE_DEFER, because the conduit ethernet is not ready.
> 
> What i don't understand from your description is why:
> 
> > +       /* setup spi */
> > +       spi->mode = SPI_MODE_3;
> > +       ret = spi_setup(spi);
> > +       if (ret)
> > +               return ret;
> > +
> 
> is causing this issue. Is spi_setup() failing?

I've added another dev_err() after the spi_setup:

[    1.680516] ksz8795-switch spi0.1: ksz8795_spi_probe:55: ret of spi_setup=0
[    1.819194] ksz8795-switch spi0.1: ksz8795_spi_probe:61: ret=-22
[    1.825611] spi_davinci 1f0e000.spi: Controller at 0x(ptrval)
…
[    1.949668] ksz8795-switch spi0.1: ksz8795_spi_probe:55: ret of spi_setup=0
[    2.090136] ksz8795-switch spi0.1: ksz8795_spi_probe:61: ret=-517
[    2.097438] ksz8795-switch spi0.1: ksz8795_spi_probe:55: ret of spi_setup=0
[    2.230043] ksz8795-switch spi0.1: ksz8795_spi_probe:61: ret=-517
[    2.241625] davinci_emac 1e20000.ethernet: incompatible machine/device type for reading mac address
[    2.255218] ksz8795-switch spi0.1: ksz8795_spi_probe:55: ret of spi_setup=0
…
[    3.121263] libphy: dsa slave smi: probed
[    3.127206] ksz8795-switch spi0.1 lan-x1 (uninitialized): PHY [dsa-0.0:00] driver [Generic PHY] (irq=POLL)
[    3.142775] ksz8795-switch spi0.1 lan-x2 (uninitialized): PHY [dsa-0.0:01] driver [Generic PHY] (irq=POLL)



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