2.6.22-rc: regression: no irda0 interface (2.6.21 was OK), smsc does not find chip

[Andrey Borzenkov]

On Monday 13 August 2007, Bjorn Helgaas wrote:
> On Saturday 11 August 2007 12:39:35 pm Andrey Borzenkov wrote:
> > This stopped working again in 2.6.23-rc. In 2.6.22 we decided to disable
> > PnP by default; it is apparently enabled now and fails to activte IrDA
> > completely. So it moves to post-2.6.22 regressions :)
> >
> > let me know which information you need
> >
> > [ 2192.666450] pnp: PnP ACPI init
> > [ 2192.666589] ACPI: bus type pnp registered
> > [ 2192.686035] pnp: Device 00:0a activated.
> > [ 2192.686089]  00:0a: SMCf010 not responding at SIR 0x100, FIR 0x2e8;
> > auto-configuring
> > [ 2192.687610] pnp: Device 00:0a disabled.
> > [ 2192.693179] pnp: Device 00:0a activated.
> > [ 2192.693210]  00:0a: not responding at SIR 0x100, FIR 0x2e8; swapping
> > SIR/FIR and reconfiguring
> > [ 2192.694720] pnp: Device 00:0a disabled.
> > [ 2192.701232] pnp: Device 00:0a activated.
> > [ 2192.701259]  00:0a: responds at SIR 0x2e8, FIR 0x100
> > [ 2192.709309] pnp: PnP ACPI: found 12 devices
> > [ 2192.709351] ACPI: ACPI bus type pnp unregistered
> >
> > ....
> >
> > [ 2207.986550] Detected unconfigured Toshiba laptop with ALi ISA bridge
> > SMSC IrDA chip, pre-configuring device.
> > [ 2207.986587] Activated ALi 1533 ISA bridge port 0x02e8.
> > [ 2207.986602] Activated ALi 1533 ISA bridge port 0x02f8.
> > [ 2207.986817] found SMC SuperIO Chip (devid=0x5a rev=00 base=0x002e):
> > LPC47N227
> > [ 2207.986851] smsc_superio_flat(): fir: 0x2f8, sir: 0x2e8, dma: 03, irq:
> > 7, mode: 0x0e
> > [ 2207.986873] smsc_ircc_present: can't get sir_base of 0x2e8
>
> As of 2.6.23-rc2, we should have:
>   - probes for 8250 legacy devices (as in 2.6.21 and previous)
>   - smsc PNP probes turned off by default (2.6.21 and previous had no
>     PNP probes for smsc at all)
>   - some complicated PNP quirks for SMCf010 devices
>
> In other words, I think we're basically back where we started.

Nope, it is a regression.

> The 8250 
> driver should find a ttyS3 device at 0x2e8, and it should claim those
> ports, which will prevent smsc from claiming them.
>

This worked in 2.6.22 and does not work in 2.6.23. So something changed. I 
make a separate post about it because it is probably unrelated to smsc.

> If you use "setserial /dev/ttyS3 none", the 8250 driver should release
> the ports at 0x2e8, and then the smsc-ircc2 driver should be able to
> load correctly.  I think this is what we always had to do in the past,
> right?
>

No; it "just worked". I do not even have setserial command ... installed one 
but this does not support "none"

> If that doesn't work, try removing the body of quirk_smc_enable() in
> drivers/pnp/quirks.c in addition.  It's possible that the quirk changes
> the config in a way that messes up the smsc-ircc2 probe.
>

If I unload 8250 smsc-ircc2 loads just fine. 
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