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Date: Mon, 5 Jul 2021 11:30:26 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Hui Wang <hui.wang@...onical.com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, Manuel Krause <manuelkrause@...scape.net>, Sasha Levin <sashal@...nel.org>, linux-acpi@...r.kernel.org Subject: [PATCH AUTOSEL 5.4 13/26] ACPI: resources: Add checks for ACPI IRQ override From: Hui Wang <hui.wang@...onical.com> [ Upstream commit 0ec4e55e9f571f08970ed115ec0addc691eda613 ] 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 the Linux kernel is modified to skip the IRQ override, the keyboard will work normally. >From the existing comment in acpi_dev_get_irqresource(), the override function only needs to be called when IRQ() or IRQNoFlags() is used to populate the resource descriptor, and according to Section 6.4.2.1 of ACPI 6.4 [1], if IRQ() is empty or IRQNoFlags() is used, the IRQ is High true, edge sensitive and non-shareable. ACPICA also assumes that to be the case (see acpi_rs_set_irq[] in rsirq.c). In accordance with the above, check 3 additional conditions (EdgeSensitive, ActiveHigh and Exclusive) when deciding whether or not to treat an ACPI_RESOURCE_TYPE_IRQ resource as "legacy", in which case the IRQ override is applicable to it. Link: https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration.html#irq-descriptor # [1] BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=213031 BugLink: http://bugs.launchpad.net/bugs/1909814 Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Reported-by: Manuel Krause <manuelkrause@...scape.net> Tested-by: Manuel Krause <manuelkrause@...scape.net> Signed-off-by: Hui Wang <hui.wang@...onical.com> [ rjw: Subject rewrite, changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/acpi/resource.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c index 48ca9a844f06..55c57b703ea3 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -430,6 +430,13 @@ static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, } } +static bool irq_is_legacy(struct acpi_resource_irq *irq) +{ + return irq->triggering == ACPI_EDGE_SENSITIVE && + irq->polarity == ACPI_ACTIVE_HIGH && + irq->shareable == ACPI_EXCLUSIVE; +} + /** * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. * @ares: Input ACPI resource object. @@ -468,7 +475,7 @@ bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, } acpi_dev_get_irqresource(res, irq->interrupts[index], irq->triggering, irq->polarity, - irq->shareable, true); + irq->shareable, irq_is_legacy(irq)); break; case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: ext_irq = &ares->data.extended_irq; -- 2.30.2
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