PNP SMCf010 quirk: auto-config device if BIOS left it broken
Some HP firmware leaves the SMCf010 IRDA device incompletely configured, or reports the wrong resources in _CRS. As a workaround, when we find such a device, try to auto-configure the device. This ignores the _CRS data, picks a config from _PRS, and runs _SRS to configure the device. This makes smsc-ircc2 work correctly with PNP resources (with no preconfiguration!) on all the machines I tested. I think Windows does something like this by default for all devices, so we should consider doing the same thing in Linux. This patch addresses part of the 2.6.22 regression: "no irda0 interface (2.6.21 was OK), smsc does not find chip" It fixes smsc-ircc2 PNP device detection on HP nc6000, nc6220, nw8000, nw8240, and possibly other machines. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Samuel Ortiz <samuel@sortiz.org> Cc: "Linus Walleij (LD/EAB)" <linus.walleij@ericsson.com> Cc: Andrey Borzenkov <arvidjaar@mail.ru> Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Cc: Adam Belay <ambx1@neo.rr.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -107,31 +107,61 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
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return;
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}
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static int quirk_smc_fir_enabled(struct pnp_dev *dev)
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{
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unsigned long firbase;
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u8 bank, high, low, chip;
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if (!pnp_port_valid(dev, 1))
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return 0;
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firbase = pnp_port_start(dev, 1);
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/* Select register bank 3 */
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bank = inb(firbase + 7);
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bank &= 0xf0;
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bank |= 3;
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outb(bank, firbase + 7);
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high = inb(firbase + 0);
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low = inb(firbase + 1);
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chip = inb(firbase + 2);
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/* This corresponds to the check in smsc_ircc_present() */
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if (high == 0x10 && low == 0xb8 && (chip == 0xf1 || chip == 0xf2))
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return 1;
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return 0;
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}
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static void quirk_smc_enable(struct pnp_dev *dev)
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{
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unsigned int firbase;
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if (!dev->active || !pnp_port_valid(dev, 1))
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/*
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* If the BIOS left the device disabled, or it is enabled and
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* responding correctly, we're in good shape.
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*/
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if (!dev->active || quirk_smc_fir_enabled(dev))
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return;
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/*
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* On the HP/Compaq nw8240 (and probably other similar machines),
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* there is an SMCF010 device with two I/O port regions:
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* Sometimes the BIOS claims the device is enabled, but it reports
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* the wrong FIR resources or doesn't properly configure ISA or LPC
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* bridges on the way to the device.
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*
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* 0x3e8-0x3ef SIR
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* 0x100-0x10f FIR
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*
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* _STA reports the device is enabled, but in fact, the BIOS
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* neglects to enable the FIR range. Fortunately, it does fully
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* enable the device if we call _SRS.
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* HP nc6000 and nc8000/nw8000 laptops have known problems like
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* this. Fortunately, they do fix things up if we auto-configure
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* the device using its _PRS and _SRS methods.
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*/
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firbase = pnp_port_start(dev, 1);
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if (inb(firbase + 0x7 /* IRCC_MASTER */) == 0xff) {
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pnp_err("%s (%s) enabled but not responding, disabling and "
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"re-enabling", dev->dev.bus_id, pnp_dev_name(dev));
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pnp_disable_dev(dev);
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pnp_activate_dev(dev);
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}
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dev_err(&dev->dev, "%s device not responding, auto-configuring "
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"resources\n", dev->id->id);
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pnp_disable_dev(dev);
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pnp_init_resource_table(&dev->res);
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pnp_auto_config_dev(dev);
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pnp_activate_dev(dev);
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if (!quirk_smc_fir_enabled(dev))
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dev_err(&dev->dev, "giving up; try \"smsc-ircc2.nopnp\"\n");
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}
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