From patchwork Thu Jun 21 02:55:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Honghui Zhang X-Patchwork-Id: 10479093 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 A342D60230 for ; Thu, 21 Jun 2018 03:04:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8F8EA28A21 for ; Thu, 21 Jun 2018 03:04:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 82EE028A3E; Thu, 21 Jun 2018 03:04:41 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, MAILING_LIST_MULTI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D8B8D28A21 for ; Thu, 21 Jun 2018 03:04:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=uhiHgHgdWvZLFQ7czc2Xna4IDYj/lyg+xszTJ6MIIJc=; b=QKrvHd1Ghy9DXM lluOqhNBNBtMt7SNDpCRd2hup0TEbze2JV11S3JGosityZNlbjpSecTNAJZj3M9UHa6u1uZQYh5/d KMsX1jik/XOvdQwBw+xam9EPFUATffR4JKh91aQ4X+hw0UYBpxMYDRps5lo743/ApPT/YDijM/LWD ZWRGpS+T7jG4WPlopOjmaLtxDdDdB/Pbijxq3tiKO0kI0tsBUlqOaQg6gh+Qvh4QtIvlmmK7JSspT lsKoeKRdv2bJdizVryy/ie9iEEYaBeq9R/YnOfvyOhCkhCc1LObuGXmBOHPzgGvzI2blWbnuOSfy4 23ucsydgmUhfpvDwN8bQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fVptm-0003Ml-Ri; Thu, 21 Jun 2018 03:04:38 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fVpkq-0006pA-2N; Thu, 21 Jun 2018 02:55:33 +0000 X-UUID: d9283f3d7202416eb31e50de1758e411-20180621 Received: from mtkcas08.mediatek.inc [(172.21.101.126)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 994990804; Thu, 21 Jun 2018 10:55:05 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Thu, 21 Jun 2018 10:55:02 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Thu, 21 Jun 2018 10:55:02 +0800 From: To: , , , , , , , , , , , Subject: [PATCH v4] PCI: mediatek: Add system pm support for MT2712 Date: Thu, 21 Jun 2018 10:55:00 +0800 Message-ID: <1529549700-18742-1-git-send-email-honghui.zhang@mediatek.com> X-Mailer: git-send-email 2.6.4 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180620_195524_285004_BEA0C7BD X-CRM114-Status: GOOD ( 12.49 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, hongkun.cao@mediatek.com, sean.wang@mediatek.com, honghui.zhang@mediatek.com, yong.wu@mediatek.com Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Honghui Zhang The MTCMOS of PCIe Host for MT2712 will be off when system suspend, and all the internal control register will be reset after system resume. The PCIe link should be re-established and the related control register values should be re-set after system resume. Signed-off-by: Honghui Zhang CC: Ryder Lee --- drivers/pci/controller/pcie-mediatek.c | 60 ++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) Change since v3: - rebase to v4.18-rc1. diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index 0baabe3..1ed2ef0 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -134,12 +134,14 @@ struct mtk_pcie_port; /** * struct mtk_pcie_soc - differentiate between host generations * @need_fix_class_id: whether this host's class ID needed to be fixed or not + * @pm_support: whether the host's MTCMOS will be off when suspend * @ops: pointer to configuration access functions * @startup: pointer to controller setting functions * @setup_irq: pointer to initialize IRQ functions */ struct mtk_pcie_soc { bool need_fix_class_id; + bool pm_support; struct pci_ops *ops; int (*startup)(struct mtk_pcie_port *port); int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node); @@ -1181,12 +1183,69 @@ static int mtk_pcie_probe(struct platform_device *pdev) return err; } +#ifdef CONFIG_PM_SLEEP +static int mtk_pcie_suspend_noirq(struct device *dev) +{ + struct mtk_pcie *pcie = dev_get_drvdata(dev); + const struct mtk_pcie_soc *soc = pcie->soc; + struct mtk_pcie_port *port; + + if (!soc->pm_support) + return 0; + + list_for_each_entry(port, &pcie->ports, list) { + clk_disable_unprepare(port->ahb_ck); + clk_disable_unprepare(port->sys_ck); + phy_power_off(port->phy); + } + + return 0; +} + +static int mtk_pcie_resume_noirq(struct device *dev) +{ + struct mtk_pcie *pcie = dev_get_drvdata(dev); + const struct mtk_pcie_soc *soc = pcie->soc; + struct mtk_pcie_port *port; + int ret; + + if (!soc->pm_support) + return 0; + + list_for_each_entry(port, &pcie->ports, list) { + phy_power_on(port->phy); + clk_prepare_enable(port->sys_ck); + clk_prepare_enable(port->ahb_ck); + + ret = soc->startup(port); + if (ret) { + dev_err(dev, "Port%d link down\n", port->slot); + phy_power_off(port->phy); + clk_disable_unprepare(port->sys_ck); + clk_disable_unprepare(port->ahb_ck); + return ret; + } + + if (IS_ENABLED(CONFIG_PCI_MSI)) + mtk_pcie_enable_msi(port); + } + + return 0; +} +#endif + +static const struct dev_pm_ops mtk_pcie_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq, + mtk_pcie_resume_noirq) +}; + static const struct mtk_pcie_soc mtk_pcie_soc_v1 = { .ops = &mtk_pcie_ops, .startup = mtk_pcie_startup_port, }; static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = { + .pm_support = true, .ops = &mtk_pcie_ops_v2, .startup = mtk_pcie_startup_port_v2, .setup_irq = mtk_pcie_setup_irq, @@ -1213,6 +1272,7 @@ static struct platform_driver mtk_pcie_driver = { .name = "mtk-pcie", .of_match_table = mtk_pcie_ids, .suppress_bind_attrs = true, + .pm = &mtk_pcie_pm_ops, }, }; builtin_platform_driver(mtk_pcie_driver);