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| author | Krzysztof Oledzki <olel@ans.pl> | 2007-10-16 23:31:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:43:04 -0700 |
| commit | 9cd8047b463f213c294f756119ac353312e7a152 (patch) | |
| tree | 2e5440895a254d631b2a24fcf61e48ec9fe4707c | |
| parent | 7ef36390fabe2168fe31f245e49eb4e5f3762622 (diff) | |
| download | linux-3.10-9cd8047b463f213c294f756119ac353312e7a152.tar.gz linux-3.10-9cd8047b463f213c294f756119ac353312e7a152.tar.bz2 linux-3.10-9cd8047b463f213c294f756119ac353312e7a152.zip | |
Fix very high interrupt rate for IRQ8 (rtc) unless pnpacpi=off
Workaround for broken systems with BIOS that makes RTC interrupt level
triggered and/or active low.
See http://bugzilla.kernel.org/show_bug.cgi?id=5243
Based on the patch from Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl>
Cc: "Li, Shaohua" <shaohua.li@intel.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Andi Kleen <ak@suse.de>
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>
| -rw-r--r-- | drivers/pnp/pnpacpi/rsparser.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pnp/pnpacpi/rsparser.c b/drivers/pnp/pnpacpi/rsparser.c index 0e3b8d0ff06..cd0a204d96d 100644 --- a/drivers/pnp/pnpacpi/rsparser.c +++ b/drivers/pnp/pnpacpi/rsparser.c @@ -85,6 +85,16 @@ static void pnpacpi_parse_allocated_irqresource(struct pnp_resource_table *res, if (i >= PNP_MAX_IRQ) return; +#ifdef CONFIG_X86 + if (gsi < 16 && (triggering != ACPI_EDGE_SENSITIVE || + polarity != ACPI_ACTIVE_HIGH)) { + pnp_warn("BIOS BUG: legacy PNP IRQ %d should be edge trigger, " + "active high", gsi); + triggering = ACPI_EDGE_SENSITIVE; + polarity = ACPI_ACTIVE_HIGH; + } +#endif + res->irq_resource[i].flags = IORESOURCE_IRQ; // Also clears _UNSET flag res->irq_resource[i].flags |= irq_flags(triggering, polarity); irq = acpi_register_gsi(gsi, triggering, polarity); |