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PNP: workaround HP BIOS defect that leaves SMCF010 device partly enabled

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Some HP/Compaq firmware reports via ACPI that the SMCF010 IR device is
enabled, but in fact, it leaves the device partly disabled.

HP nw8240 BIOS 68DTV Ver.  F.0F, released 9/15/2005 is one BIOS that has this
problem.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Keith Owens <kaos@ocs.com.au>
Cc: Len Brown <lenb@kernel.org>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Russell King <rmk+serial@arm.linux.org.uk>
Cc: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bjorn Helgaas 2007-05-08 00:36:00 -07:00 committed by Linus Torvalds
parent 8f81dd1498
commit a1e7e636fe
1 changed files with 30 additions and 0 deletions
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30
drivers/pnp/quirks.c
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@ -16,6 +16,7 @@
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include <linux/io.h>
#include "base.h"
@ -106,6 +107,34 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
return;
}
static void quirk_smc_enable(struct pnp_dev *dev)
{
unsigned int firbase;
if (!dev->active || !pnp_port_valid(dev, 1))
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
*
* _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.
*/
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));
pnp_disable_dev(dev);
pnp_activate_dev(dev);
}
}
/*
* PnP Quirks
* Cards or devices that need some tweaking due to incomplete resource info
@ -126,6 +155,7 @@ static struct pnp_fixup pnp_fixups[] = {
{ "CTL0043", quirk_sb16audio_resources },
{ "CTL0044", quirk_sb16audio_resources },
{ "CTL0045", quirk_sb16audio_resources },
{ "SMCf010", quirk_smc_enable },
{ "" }
};