Commit 172d0496 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Linus Torvalds
Browse files

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: default avatarBjorn 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7c31d2f5

drivers/pnp/quirks.c

+48 −18
Original line number Diff line number Diff line
@@ -107,31 +107,61 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev) 
	return;

}



static void quirk_smc_enable(struct pnp_dev *dev)

static int quirk_smc_fir_enabled(struct pnp_dev *dev)

{

	unsigned int firbase;

	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;

}



	if (!dev->active || !pnp_port_valid(dev, 1))

static void quirk_smc_enable(struct pnp_dev *dev)

{

	/*

	 * If the BIOS left the device disabled, or it is enabled and

	 * responding correctly, we're in good shape.

	 */

	if (!dev->active || quirk_smc_fir_enabled(dev))

		return;



	/*

	 * On the HP/Compaq nw8240 (and probably other similar machines),

	 * there is an SMCF010 device with two I/O port regions:

	 *

	 *	0x3e8-0x3ef SIR

	 *	0x100-0x10f FIR

	 * 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.

	 *

	 * _STA reports the device is enabled, but in fact, the BIOS

	 * neglects to enable the FIR range.  Fortunately, it does fully

	 * enable the device if we call _SRS.

	 * 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.

	 */

	firbase = pnp_port_start(dev, 1);

	if (inb(firbase + 0x7 /* IRCC_MASTER */) == 0xff) {

		pnp_err("%s (%s) enabled but not responding, disabling and "

			"re-enabling", dev->dev.bus_id, pnp_dev_name(dev));

	dev_err(&dev->dev, "%s device not responding, auto-configuring "

		"resources\n", dev->id->id);



	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, "giving up; try \"smsc-ircc2.nopnp\"\n");

}

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