From patchwork Wed Jun 9 02:14:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hui Wang X-Patchwork-Id: 12308715 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7DC8C48BCF for ; Wed, 9 Jun 2021 02:14:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A5CF60FD8 for ; Wed, 9 Jun 2021 02:14:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233163AbhFICQo (ORCPT ); Tue, 8 Jun 2021 22:16:44 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:53646 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232224AbhFICQo (ORCPT ); Tue, 8 Jun 2021 22:16:44 -0400 Received: from [123.112.67.167] (helo=localhost.localdomain) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1lqnk0-0006cV-Sk; Wed, 09 Jun 2021 02:14:49 +0000 From: Hui Wang To: linux-acpi@vger.kernel.org, rafael.j.wysocki@intel.com Cc: manuelkrause@netscape.net, hui.wang@canonical.com Subject: [PATCH v3] ACPI : don't always override the acpi irq Date: Wed, 9 Jun 2021 10:14:42 +0800 Message-Id: <20210609021442.12446-1-hui.wang@canonical.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org 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 the Section 6.4.2.1 of ACPI 6.4 spec [1], 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. Here check 3 conditions to decide if the legacy is true or not, if it is true, it means the IRQ() is empty or defines IRQNoFlags and need to call irq_override(). 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 Reported-and-tested-by: Manuel Krause Signed-off-by: Hui Wang --- 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 ee78a210c606..dc01fb550b28 100644 --- a/drivers/acpi/resource.c +++ b/drivers/acpi/resource.c @@ -423,6 +423,13 @@ 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. @@ -461,7 +468,7 @@ 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;