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ACPI: add _PRT quirks to work around broken firmware 

This patch works around incorrect _PRT (PCI interrupt routing)
information from firmware.  This does not fix any regressions
and can wait for the next kernel release.

On the Medion MD9580-F laptop, the BIOS says the builtin RTL8139
NIC interrupt at 00:09.0[A] is connected to \_SB.PCI0.ISA.LNKA, but
it's really connected to \_SB.PCI0.ISA.LNKB.  Before this patch,
the workaround was to use "pci=routeirq".  More details at
http://bugzilla.kernel.org/show_bug.cgi?id=4773.

On the Dell OptiPlex GX1, the BIOS says the PCI slot interrupt
00:0d[A] is connected to LNKB, but it's really connected to LNKA.
Before this patch, the workaround was to use "pci=routeirq".
Pierre Ossman tested a previous version of this patch and confirmed
that it fixed the problem.  More details at
http://bugzilla.kernel.org/show_bug.cgi?id=5044.

On the HP t5710 thin client, the BIOS says the builtin Radeon
video interrupt at 01:00[A] is connected to LNK1, but it's really
connected to LNK3.  The previous workaround was to use a custom
DSDT.  I tested this patch and verified that it fixes the problem.
More details at http://bugzilla.kernel.org/show_bug.cgi?id=10138.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2008-03-11 13:45:15 -07:00 committed by Len Brown
parent baadac8b10
commit 391df5dce3
1 changed files with 98 additions and 0 deletions
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98
drivers/acpi/pci_irq.c
View File

@ -25,6 +25,7 @@
*/
#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@ -76,6 +77,101 @@ static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
return NULL;
}
/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
static struct dmi_system_id medion_md9580[] = {
{
.ident = "Medion MD9580-F laptop",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
},
},
{ }
};
/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
static struct dmi_system_id dell_optiplex[] = {
{
.ident = "Dell Optiplex GX1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
},
},
{ }
};
/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
static struct dmi_system_id hp_t5710[] = {
{
.ident = "HP t5710",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
},
},
{ }
};
struct prt_quirk {
struct dmi_system_id *system;
unsigned int segment;
unsigned int bus;
unsigned int device;
unsigned char pin;
char *source; /* according to BIOS */
char *actual_source;
};
/*
* These systems have incorrect _PRT entries. The BIOS claims the PCI
* interrupt at the listed segment/bus/device/pin is connected to the first
* link device, but it is actually connected to the second.
*/
static struct prt_quirk prt_quirks[] = {
{ medion_md9580, 0, 0, 9, 'A',
"\\_SB_.PCI0.ISA.LNKA",
"\\_SB_.PCI0.ISA.LNKB"},
{ dell_optiplex, 0, 0, 0xd, 'A',
"\\_SB_.LNKB",
"\\_SB_.LNKA"},
{ hp_t5710, 0, 0, 1, 'A',
"\\_SB_.PCI0.LNK1",
"\\_SB_.PCI0.LNK3"},
};
static void
do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
{
int i;
struct prt_quirk *quirk;
for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
quirk = &prt_quirks[i];
/* All current quirks involve link devices, not GSIs */
if (!prt->source)
continue;
if (dmi_check_system(quirk->system) &&
entry->id.segment == quirk->segment &&
entry->id.bus == quirk->bus &&
entry->id.device == quirk->device &&
entry->pin + 'A' == quirk->pin &&
!strcmp(prt->source, quirk->source) &&
strlen(prt->source) >= strlen(quirk->actual_source)) {
printk(KERN_WARNING PREFIX "firmware reports "
"%04x:%02x:%02x[%c] connected to %s; "
"changing to %s\n",
entry->id.segment, entry->id.bus,
entry->id.device, 'A' + entry->pin,
prt->source, quirk->actual_source);
strcpy(prt->source, quirk->actual_source);
}
}
}
static int
acpi_pci_irq_add_entry(acpi_handle handle,
int segment, int bus, struct acpi_pci_routing_table *prt)
@ -96,6 +192,8 @@ acpi_pci_irq_add_entry(acpi_handle handle,
entry->id.function = prt->address & 0xFFFF;
entry->pin = prt->pin;
do_prt_fixups(entry, prt);
/*
* Type 1: Dynamic
* ---------------