From patchwork Sat Dec 5 15:29:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 338423 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=-12.2 required=3.0 tests=BAYES_00, DATE_IN_PAST_03_06, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 B209FC433FE for ; Sat, 5 Dec 2020 19:30:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7956722DBF for ; Sat, 5 Dec 2020 19:30:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725903AbgLETaY (ORCPT ); Sat, 5 Dec 2020 14:30:24 -0500 Received: from cloudserver094114.home.pl ([79.96.170.134]:44830 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725867AbgLETaY (ORCPT ); Sat, 5 Dec 2020 14:30:24 -0500 Received: from 89-77-60-66.dynamic.chello.pl (89.77.60.66) (HELO kreacher.localnet) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.83.530) id 1acd33b1d947bb61; Sat, 5 Dec 2020 16:29:41 +0100 From: "Rafael J. Wysocki" To: Linux ACPI Cc: LKML , Srinivas Pandruvada , Hans De Goede , Zhang Rui , David Box Subject: [PATCH] ACPI: scan: Add PNP0D80 to the _DEP exceptions list Date: Sat, 05 Dec 2020 16:29:41 +0100 Message-ID: <3849919.JfvvSOo2yN@kreacher> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Rafael J. Wysocki The PNP0D80 ("Windows-compatible System Power Management Controller") device ID is used for identifying the special device object providing the LPI (Low-power S0 Idle) _DSM interface [1]. That device object does not supply any operation regions, but it appears in _DEP lists for other devices in the ACPI tables on some systems to enforce specific enumeration ordering that does not matter in Linux. For this reason, _DEP list entries pointing to the device object whose _CID returns PNP0D80 need not be taken into account as real operation region dependencies, so add that device ID to the list of device IDs for which the matching _DEP list entries should be ignored. Accordingly, update the function used for matching device IDs in that list to allow it to check _CID as well as _HID and rename it to acpi_info_matches_ids(). Link: https://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf # [1] Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) Index: linux-pm/drivers/acpi/scan.c =================================================================== --- linux-pm.orig/drivers/acpi/scan.c +++ linux-pm/drivers/acpi/scan.c @@ -719,25 +719,40 @@ int acpi_device_add(struct acpi_device * /* -------------------------------------------------------------------------- Device Enumeration -------------------------------------------------------------------------- */ -static bool acpi_info_matches_hids(struct acpi_device_info *info, - const char * const hids[]) +static bool acpi_info_matches_ids(struct acpi_device_info *info, + const char * const ids[]) { + struct acpi_pnp_device_id_list *cid_list = NULL; int i; if (!(info->valid & ACPI_VALID_HID)) return false; - for (i = 0; hids[i]; i++) { - if (!strcmp(info->hardware_id.string, hids[i])) + if (info->valid & ACPI_VALID_CID) + cid_list = &info->compatible_id_list; + + for (i = 0; ids[i]; i++) { + int j; + + if (!strcmp(info->hardware_id.string, ids[i])) return true; + + if (!cid_list) + continue; + + for (j = 0; j < cid_list->count; j++) { + if (!strcmp(cid_list->ids[j].string, ids[i])) + return true; + } } return false; } /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ -static const char * const acpi_ignore_dep_hids[] = { +static const char * const acpi_ignore_dep_ids[] = { "INT3396", /* Windows System Power Management Controller */ + "PNP0D80", /* Windows-compatible System Power Management Controller */ NULL }; @@ -1857,7 +1872,7 @@ static void acpi_device_dep_initialize(s continue; } - skip = acpi_info_matches_hids(info, acpi_ignore_dep_hids); + skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); kfree(info); if (skip)