From patchwork Tue Jun 18 16:18:58 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 1118114 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45StYz5FYmz9sBr for ; Wed, 19 Jun 2019 02:19:03 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729514AbfFRQTC (ORCPT ); Tue, 18 Jun 2019 12:19:02 -0400 Received: from mga14.intel.com ([192.55.52.115]:20115 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729320AbfFRQTC (ORCPT ); Tue, 18 Jun 2019 12:19:02 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Jun 2019 09:19:01 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,389,1557212400"; d="scan'208";a="186166083" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga002.fm.intel.com with ESMTP; 18 Jun 2019 09:18:59 -0700 Received: by black.fi.intel.com (Postfix, from userid 1001) id 9A6761F5; Tue, 18 Jun 2019 19:18:58 +0300 (EEST) From: Mika Westerberg To: "Rafael J. Wysocki" , Bjorn Helgaas Cc: Len Brown , Lukas Wunner , Keith Busch , Alex Williamson , Alexandru Gagniuc , Mika Westerberg , linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH v2 3/3] PCI / ACPI: Add _PR0 dependent devices Date: Tue, 18 Jun 2019 19:18:58 +0300 Message-Id: <20190618161858.77834-4-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190618161858.77834-1-mika.westerberg@linux.intel.com> References: <20190618161858.77834-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If otherwise unrelated PCI devices share ACPI power resources turning them on causes the devices to enter D0uninitialized power state which may cause problems. For example in Intel Ice Lake two root ports (RP0 and RP1), Thunderbolt controller (NHI) and xHCI controller all share power resources as can be ween in the topology below where power resources are marked with []: Host bridge | +- RP0 ---\ +- RP1 ---|--+--> [TBT] +- NHI --/ | | | | v +- xHCI --> [D3C] In a situation where all devices sharing the power resources are in D3cold (the power resources are turned off) and for example the Thunderbolt controller is runtime resumed resulting that the power resources are turned on. This means that the other devices sharing them (RP0, RP1 and xHCI) are transitioned into D0uninitialized state. If they were configured to trigger wake (PME) on a certain event that configuration gets lost after reset so we would need to re-initialize them to get the wakeup working as expected again. To do so we would need to runtime resume all of them to make sure their registers get restored properly before we can runtime suspend them again. Since we just added concept of "_PR0 dependent device" we can solve this by calling the relevant add/remove functions when the PCI device is bind to its ACPI representation. If it has power resources the PCI device will be added as dependent device to them and runtime resumed whenever they are physically turned on. This should make sure PCI core can reconfigure wakes after the device is transitioned into D0uninitialized. Signed-off-by: Mika Westerberg --- drivers/pci/pci-acpi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index b782acac26c5..2abe0eeafb53 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -902,6 +902,7 @@ static void pci_acpi_setup(struct device *dev) device_wakeup_enable(dev); acpi_pci_wakeup(pci_dev, false); + acpi_device_power_add_dependent(adev, dev); } static void pci_acpi_cleanup(struct device *dev) @@ -914,6 +915,7 @@ static void pci_acpi_cleanup(struct device *dev) pci_acpi_remove_pm_notifier(adev); if (adev->wakeup.flags.valid) { + acpi_device_power_remove_dependent(adev, dev); if (pci_dev->bridge_d3) device_wakeup_disable(dev);