From patchwork Fri Mar 9 19:00:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 10271771 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 269246016D for ; Fri, 9 Mar 2018 19:02:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 19FC82981D for ; Fri, 9 Mar 2018 19:02:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0EBF62983E; Fri, 9 Mar 2018 19:02:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ABAC32981D for ; Fri, 9 Mar 2018 19:02:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932635AbeCITAJ (ORCPT ); Fri, 9 Mar 2018 14:00:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:40712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932468AbeCITAG (ORCPT ); Fri, 9 Mar 2018 14:00:06 -0500 Received: from localhost (unknown [104.132.51.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BDA532178C; Fri, 9 Mar 2018 19:00:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BDA532178C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=helgaas@kernel.org Subject: [PATCH v2 03/13] PCI/PM: Clear PCIe PME Status bit in core, not PCIe port driver From: Bjorn Helgaas To: linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , linux-pm@vger.kernel.org, Keith Busch , Sinan Kaya , Lukas Wunner , Frederick Lawler Date: Fri, 09 Mar 2018 13:00:05 -0600 Message-ID: <152062200554.77693.6916522408891197006.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <152062141493.77693.9630397416694091342.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <152062141493.77693.9630397416694091342.stgit@bhelgaas-glaptop.roam.corp.google.com> User-Agent: StGit/0.18 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Bjorn Helgaas fe31e69740ed ("PCI/PCIe: Clear Root PME Status bits early during system resume") added a .resume_noirq() callback to the PCIe port driver to clear the PME Status bit during resume to work around a BIOS issue. The BIOS evidently enabled PME interrupts for ACPI-based runtime wakeups but did not clear the PME Status bit during resume, which meant PMEs after resume did not trigger interrupts because PME Status did not transition from cleared to set. The fix was in the PCIe port driver, so it worked when CONFIG_PCIEPORTBUS was set. But I think we *always* want the fix because the platform may use PME interrupts even if Linux is built without the PCIe port driver. Move the fix from the port driver to the PCI core so we can work around this "PME doesn't work after waking from a sleep state" issue regardless of CONFIG_PCIEPORTBUS. Signed-off-by: Bjorn Helgaas --- drivers/pci/pci-driver.c | 14 ++++++++++++++ drivers/pci/pcie/portdrv_pci.c | 15 --------------- 2 files changed, 14 insertions(+), 15 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 3bed6beda051..e561fa0f456c 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -525,6 +525,18 @@ static void pci_pm_default_resume_early(struct pci_dev *pci_dev) pci_fixup_device(pci_fixup_resume_early, pci_dev); } +static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev) +{ + /* + * Some BIOSes forget to clear Root PME Status bits after system + * wakeup, which breaks ACPI-based runtime wakeup on PCI Express. + * Clear those bits now just in case (shouldn't hurt). + */ + if (pci_is_pcie(pci_dev) && + pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT) + pcie_clear_root_pme_status(pci_dev); +} + /* * Default "suspend" method for devices that have no driver provided suspend, * or not even a driver at all (second part). @@ -873,6 +885,8 @@ static int pci_pm_resume_noirq(struct device *dev) if (pci_has_legacy_pm_support(pci_dev)) return pci_legacy_resume_early(dev); + pcie_pme_root_status_cleanup(pci_dev); + if (drv && drv->pm && drv->pm->resume_noirq) error = drv->pm->resume_noirq(dev); diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index d6f10a97d400..ec9e936c2a5b 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -61,20 +61,6 @@ static int pcie_portdrv_restore_config(struct pci_dev *dev) } #ifdef CONFIG_PM -static int pcie_port_resume_noirq(struct device *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev); - - /* - * Some BIOSes forget to clear Root PME Status bits after system wakeup - * which breaks ACPI-based runtime wakeup on PCI Express, so clear those - * bits now just in case (shouldn't hurt). - */ - if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT) - pcie_clear_root_pme_status(pdev); - return 0; -} - static int pcie_port_runtime_suspend(struct device *dev) { return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY; @@ -102,7 +88,6 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = { .thaw = pcie_port_device_resume, .poweroff = pcie_port_device_suspend, .restore = pcie_port_device_resume, - .resume_noirq = pcie_port_resume_noirq, .runtime_suspend = pcie_port_runtime_suspend, .runtime_resume = pcie_port_runtime_resume, .runtime_idle = pcie_port_runtime_idle,