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SubjectRe: [2.6.23-rc3 possible regression] 8250 claims nonexisting device blocking IO port
Date
On Tuesday 21 August 2007 12:28:49 pm Andrey Borzenkov wrote:
> On Monday 20 August 2007, Bjorn Helgaas wrote:
> > On Monday 20 August 2007 10:28:22 am Andrey Borzenkov wrote:
> > > This worked in 2.6.22 with the same quirks. I will test without later but
> > > I fail to see how they are related.
> >
> > OK, let me know what happens. The way it's related is that the quirk
> > fiddles with the IRDA device, and it probably changes the SIR config
> > so that it starts responding at the ttyS3 address.
>
> You are probably right. Disabling quirk makes it work again (with pnp off in
> smsc-ircc2 of course).

I think pnp is off in smsc-ircc2 by default, right?

> Hmm ... is there any reason why this quirk is in PnP core in the first place?
> Would not it be more logical to have it in (PnP) part of smsc-ircc2? This way
> it could share code with legacy detection; and it even may have chance to
> work - assuming BIOS is aware that 0x100 is claimed by PCMCIA it could
> allocate different port when we try to activate device after that ... should
> I give it a try?

I agree it would make sense to put the quirk in smsc-ircc2, since
we only need it if we want to use the smsc-ircc2 driver. But I don't
think we have a mechanism for calling quirks at module load-time, so
it has to be part of the static kernel. And we don't have anything
like DECLARE_PCI_FIXUP_SECTION, so it really has to be in quirks.c for
now.

How does the following patch look?



PNP: remove SMCf010 quirk

If the quirk enables the SIR part of the SMCf010 device, the 8250 driver
may claim it as a legacy ttyS device, which makes the legacy probe in the
smsc-ircc2 driver fail.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>

Index: w/drivers/pnp/quirks.c
===================================================================
--- w.orig/drivers/pnp/quirks.c 2007-08-21 12:34:51.000000000 -0600
+++ w/drivers/pnp/quirks.c 2007-08-21 12:35:08.000000000 -0600
@@ -107,108 +107,6 @@
"pnp: SB audio device quirk - increasing port range\n");
}

-static int quirk_smc_fir_enabled(struct pnp_dev *dev)
-{
- unsigned long firbase;
- u8 bank, high, low, chip;
-
- if (!pnp_port_valid(dev, 1))
- return 0;
-
- firbase = pnp_port_start(dev, 1);
-
- /* Select register bank 3 */
- bank = inb(firbase + 7);
- bank &= 0xf0;
- bank |= 3;
- outb(bank, firbase + 7);
-
- high = inb(firbase + 0);
- low = inb(firbase + 1);
- chip = inb(firbase + 2);
-
- /* This corresponds to the check in smsc_ircc_present() */
- if (high == 0x10 && low == 0xb8 && (chip == 0xf1 || chip == 0xf2))
- return 1;
-
- return 0;
-}
-
-static void quirk_smc_enable(struct pnp_dev *dev)
-{
- struct resource fir, sir, irq;
-
- pnp_activate_dev(dev);
- if (quirk_smc_fir_enabled(dev))
- return;
-
- /*
- * Sometimes the BIOS claims the device is enabled, but it reports
- * the wrong FIR resources or doesn't properly configure ISA or LPC
- * bridges on the way to the device.
- *
- * HP nc6000 and nc8000/nw8000 laptops have known problems like
- * this. Fortunately, they do fix things up if we auto-configure
- * the device using its _PRS and _SRS methods.
- */
- dev_err(&dev->dev, "%s not responding at SIR 0x%lx, FIR 0x%lx; "
- "auto-configuring\n", dev->id->id,
- (unsigned long)pnp_port_start(dev, 0),
- (unsigned long)pnp_port_start(dev, 1));
-
- pnp_disable_dev(dev);
- pnp_init_resource_table(&dev->res);
- pnp_auto_config_dev(dev);
- pnp_activate_dev(dev);
- if (quirk_smc_fir_enabled(dev)) {
- dev_err(&dev->dev, "responds at SIR 0x%lx, FIR 0x%lx\n",
- (unsigned long)pnp_port_start(dev, 0),
- (unsigned long)pnp_port_start(dev, 1));
- return;
- }
-
- /*
- * The Toshiba Portege 4000 _CRS reports the FIR region first,
- * followed by the SIR region. The BIOS will configure the bridge,
- * but only if we call _SRS with SIR first, then FIR. It also
- * reports the IRQ as active high, when it is really active low.
- */
- dev_err(&dev->dev, "not responding at SIR 0x%lx, FIR 0x%lx; "
- "swapping SIR/FIR and reconfiguring\n",
- (unsigned long)pnp_port_start(dev, 0),
- (unsigned long)pnp_port_start(dev, 1));
-
- /*
- * Clear IORESOURCE_AUTO so pnp_activate_dev() doesn't reassign
- * these resources any more.
- */
- fir = dev->res.port_resource[0];
- sir = dev->res.port_resource[1];
- fir.flags &= ~IORESOURCE_AUTO;
- sir.flags &= ~IORESOURCE_AUTO;
-
- irq = dev->res.irq_resource[0];
- irq.flags &= ~IORESOURCE_AUTO;
- irq.flags &= ~IORESOURCE_BITS;
- irq.flags |= IORESOURCE_IRQ_LOWEDGE;
-
- pnp_disable_dev(dev);
- dev->res.port_resource[0] = sir;
- dev->res.port_resource[1] = fir;
- dev->res.irq_resource[0] = irq;
- pnp_activate_dev(dev);
-
- if (quirk_smc_fir_enabled(dev)) {
- dev_err(&dev->dev, "responds at SIR 0x%lx, FIR 0x%lx\n",
- (unsigned long)pnp_port_start(dev, 0),
- (unsigned long)pnp_port_start(dev, 1));
- return;
- }
-
- dev_err(&dev->dev, "giving up; try \"smsc-ircc2.nopnp\" and "
- "email bjorn.helgaas@hp.com\n");
-}
-
/*
* PnP Quirks
* Cards or devices that need some tweaking due to incomplete resource info
@@ -229,7 +127,6 @@
{"CTL0043", quirk_sb16audio_resources},
{"CTL0044", quirk_sb16audio_resources},
{"CTL0045", quirk_sb16audio_resources},
- {"SMCf010", quirk_smc_enable},
{""}
};



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