The laptop keyboard doesn't work on many MEDION notebooks, but the
keyboard works well under Windows and Unix.
Through debugging, we found this log in the dmesg:
ACPI: IRQ 1 override to edge, high
pnp 00:03: Plug and Play ACPI device, IDs PNP0303 (active)
And we checked the IRQ definition in the DSDT, it is:
IRQ (Level, ActiveLow, Exclusive, )
{1}
So the BIOS defines the keyboard irq to Level_Low, but the linux
kernel override it to Edge_High. If let the linux kernel skip the irq
override, the keyboard will work normally.
>From the existing comment in the acpi_dev_get_irqresource(), the
override function only needs to be called when BIOS defines IRQ() or
IRQNoFlags, and according to page 419 and 420 of the
ACPI_6_3_final_Jan30.pdf, if IRQ() is empty or defines IRQNoFlags,
the IRQ is High true, edge sensitive and non-shareable. The linux
ACPI driver (acpi_rs_set_irq[] in rsirq.c) also assumes so.
So here add a function to check 4 conditions, if all of them are true,
call override function. otherwise, it means IRQ descriptior in the
BIOS is not legacy or is not empty.
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213031
BugLink: http://bugs.launchpad.net/bugs/1909814
Reported-and-tested-by: Manuel Krause <manuelkrause@xxxxxxxxxxxx>
Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
---
drivers/acpi/resource.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index ee78a210c606..d346aa24ffd6 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -380,6 +380,16 @@ unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
}
EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
+static bool acpi_dev_irq_empty_or_noflags(bool legacy, u8 triggering, u8 polarity,
+ u8 shareable)
+{
+ if (legacy && (triggering == ACPI_EDGE_SENSITIVE) &&
+ (polarity == ACPI_ACTIVE_HIGH) && (shareable == ACPI_EXCLUSIVE))
+ return true;
+ else
+ return false;
+}
+
static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
u8 triggering, u8 polarity, u8 shareable,
bool legacy)
@@ -401,7 +411,8 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
* using extended IRQ descriptors we take the IRQ configuration
* from _CRS directly.
*/
- if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
+ if (acpi_dev_irq_empty_or_noflags(legacy, triggering, polarity, shareable)
+ && !acpi_get_override_irq(gsi, &t, &p)) {
u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
--
2.25.1
