From patchwork Mon Dec 25 11:47:41 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeffy Chen X-Patchwork-Id: 10132493 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 356D4605B4 for ; Mon, 25 Dec 2017 11:49:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 242CF2D841 for ; Mon, 25 Dec 2017 11:49:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 18C2A2D848; Mon, 25 Dec 2017 11:49:57 +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=ham 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 A00302D846 for ; Mon, 25 Dec 2017 11:49:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752665AbdLYLtt (ORCPT ); Mon, 25 Dec 2017 06:49:49 -0500 Received: from regular1.263xmail.com ([211.150.99.135]:60078 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752656AbdLYLtq (ORCPT ); Mon, 25 Dec 2017 06:49:46 -0500 Received: from jeffy.chen?rock-chips.com (unknown [192.168.167.16]) by regular1.263xmail.com (Postfix) with ESMTP id DE8281DE82; Mon, 25 Dec 2017 19:49:41 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTPA id 688DA39C; Mon, 25 Dec 2017 19:49:39 +0800 (CST) X-RL-SENDER: jeffy.chen@rock-chips.com X-FST-TO: linux-kernel@vger.kernel.org X-SENDER-IP: 103.29.142.67 X-LOGIN-NAME: jeffy.chen@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: cjf@rock-chips.com X-DNS-TYPE: 0 Received: from localhost (unknown [103.29.142.67]) by smtp.263.net (Postfix) whith ESMTP id 12604G9VT93; Mon, 25 Dec 2017 19:49:43 +0800 (CST) From: Jeffy Chen To: linux-kernel@vger.kernel.org, bhelgaas@google.com Cc: linux-pm@vger.kernel.org, tony@atomide.com, shawn.lin@rock-chips.com, briannorris@chromium.org, rjw@rjwysocki.net, dianders@chromium.org, Jeffy Chen , devicetree@vger.kernel.org, linux-pci@vger.kernel.org, Rob Herring , Frank Rowand Subject: [RFC PATCH v11 4/5] PCI / PM: Add support for the PCIe WAKE# signal for OF Date: Mon, 25 Dec 2017 19:47:41 +0800 Message-Id: <20171225114742.18920-5-jeffy.chen@rock-chips.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171225114742.18920-1-jeffy.chen@rock-chips.com> References: <20171225114742.18920-1-jeffy.chen@rock-chips.com> 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 Add of_pci_setup_wake_irq() and of_pci_teardown_wake_irq() to handle the PCIe WAKE# interrupt. Also use the dedicated wakeirq infrastructure to simplify it. Signed-off-by: Jeffy Chen --- Changes in v11: Only support 1-per-device PCIe WAKE# pin as suggested. Changes in v10: Use device_set_wakeup_capable() instead of device_set_wakeup_enable(), since dedicated wakeirq will be lost in device_set_wakeup_enable(false). Changes in v9: Fix check error in .cleanup(). Move dedicated wakeirq setup to setup() callback and use device_set_wakeup_enable() to enable/disable. Changes in v8: Add pci-of.c and use platform_pm_ops to handle the PCIe WAKE# signal. Changes in v7: Move PCIE_WAKE handling into pci core. Changes in v6: Fix device_init_wake error handling, and add some comments. Changes in v5: Rebase. Changes in v3: Fix error handling. Changes in v2: Use dev_pm_set_dedicated_wake_irq. drivers/of/of_pci_irq.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pci-driver.c | 10 ++++++++++ include/linux/of_pci.h | 9 +++++++++ 3 files changed, 68 insertions(+) diff --git a/drivers/of/of_pci_irq.c b/drivers/of/of_pci_irq.c index d39565d5477b..def884c1a37a 100644 --- a/drivers/of/of_pci_irq.c +++ b/drivers/of/of_pci_irq.c @@ -1,8 +1,57 @@ #include #include #include +#include #include +int of_pci_setup_wake_irq(struct pci_dev *pdev) +{ + struct pci_dev *ppdev; + struct device_node *dn; + int ret, irq; + + /* Get the pci_dev of our parent. Hopefully it's a port. */ + ppdev = pdev->bus->self; + /* Nope, it's a host bridge. */ + if (!ppdev) + return 0; + + dn = pci_device_to_OF_node(ppdev); + if (!dn) + return 0; + + irq = of_irq_get_byname(dn, "wakeup"); + if (irq == -EPROBE_DEFER) + return irq; + /* Ignore other errors, since a missing wakeup is non-fatal. */ + else if (irq < 0) { + dev_info(&pdev->dev, "cannot get wakeup interrupt: %d\n", irq); + return 0; + } + + device_init_wakeup(&pdev->dev, true); + + ret = dev_pm_set_dedicated_wake_irq(&pdev->dev, irq); + if (ret < 0) { + dev_err(&pdev->dev, "failed to set wake IRQ: %d\n", ret); + device_init_wakeup(&pdev->dev, false); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(of_pci_setup_wake_irq); + +void of_pci_teardown_wake_irq(struct pci_dev *pdev) +{ + if (!pdev->dev.power.wakeirq) + return; + + dev_pm_clear_wake_irq(&pdev->dev); + device_init_wakeup(&pdev->dev, false); +} +EXPORT_SYMBOL_GPL(of_pci_teardown_wake_irq); + /** * of_irq_parse_pci - Resolve the interrupt for a PCI device * @pdev: the device whose interrupt is to be resolved diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index d79dbc377b9c..b4475ff35d97 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -421,10 +422,17 @@ static int pci_device_probe(struct device *dev) if (error < 0) return error; + error = of_pci_setup_wake_irq(pci_dev); + if (error < 0) { + pcibios_free_irq(pci_dev); + return error; + } + pci_dev_get(pci_dev); if (pci_device_can_probe(pci_dev)) { error = __pci_device_probe(drv, pci_dev); if (error) { + of_pci_teardown_wake_irq(pci_dev); pcibios_free_irq(pci_dev); pci_dev_put(pci_dev); } @@ -438,6 +446,8 @@ static int pci_device_remove(struct device *dev) struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *drv = pci_dev->driver; + of_pci_teardown_wake_irq(pci_dev); + if (drv) { if (drv->remove) { pm_runtime_get_sync(dev); diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index bf588a05d0d0..80fe8ae3393e 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -10,6 +10,8 @@ struct of_phandle_args; struct device_node; #ifdef CONFIG_OF_PCI +int of_pci_setup_wake_irq(struct pci_dev *pdev); +void of_pci_teardown_wake_irq(struct pci_dev *pdev); int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq); struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn); @@ -23,6 +25,13 @@ int of_pci_map_rid(struct device_node *np, u32 rid, const char *map_name, const char *map_mask_name, struct device_node **target, u32 *id_out); #else +static inline int of_pci_setup_wake_irq(struct pci_dev *pdev) +{ + return 0; +} + +static void of_pci_teardown_wake_irq(struct pci_dev *pdev) { }; + static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { return 0;