From patchwork Wed Apr 14 13:20:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Peled X-Patchwork-Id: 12202773 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 DB1B6C433B4 for ; Wed, 14 Apr 2021 13:21:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BD93F61132 for ; Wed, 14 Apr 2021 13:21:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351293AbhDNNWD (ORCPT ); Wed, 14 Apr 2021 09:22:03 -0400 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:27736 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229450AbhDNNWC (ORCPT ); Wed, 14 Apr 2021 09:22:02 -0400 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13EDLQD6027731; Wed, 14 Apr 2021 06:21:26 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=pfpt0220; bh=yL2TE49Ph1eFxqJLXW3dPQR/djJYvlhBmxhBpOY7iSI=; b=PAnU6weDFy20d1abhnCUKuiPfLUJjZLYPnFMFKmlgKQAKhBHzI/UZsrS1HSbgs6cD60u LcOyfXLvcO6phQcOf1pKZtdeb8S88DBBkKD1JSHehE1a5dj8+thN5XW3nB8gZl0UR8xq Dl0wb/gZWSbkz6sw38s6I45DKGD3IcpwsY/Y4mg/v+3p53AbarDshtz1Dd/ho1iYoU2p 8PUSnWcXv9hQLzygwZliqfAJZ7GPGYsq4SR2vPK+VCm7qWKznEGbZoU7bt7FsYRXgqKP gpTXI32ey4bPVJDsrbESqgILyle86hYEqaiZIo+84sMKh8y/70LFFj58VY0/4Y5SUz/9 jQ== Received: from dc5-exch01.marvell.com ([199.233.59.181]) by mx0a-0016f401.pphosted.com with ESMTP id 37wn4wt5r4-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Wed, 14 Apr 2021 06:21:26 -0700 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Apr 2021 06:21:23 -0700 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 14 Apr 2021 06:21:23 -0700 Received: from nw-bp.marvell.com (nw-bp.marvell.com [10.5.24.22]) by maili.marvell.com (Postfix) with ESMTP id C05B83F7040; Wed, 14 Apr 2021 06:21:19 -0700 (PDT) From: To: , , CC: , , , , , , , , , , , , , , Ben Peled Subject: =?utf-8?q?=5B=E2=80=9DPATCH=E2=80=9D_v2_5/5=5D_PCI=3A_armada8k=3A_a?= =?utf-8?q?dd_device_reset_to_link-down_handle?= Date: Wed, 14 Apr 2021 16:20:54 +0300 Message-ID: <1618406454-7953-6-git-send-email-bpeled@marvell.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1618406454-7953-1-git-send-email-bpeled@marvell.com> References: <1618406454-7953-1-git-send-email-bpeled@marvell.com> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: -cKwrM6rjjzn37Rup-lWxZXYcioIbeMp X-Proofpoint-GUID: -cKwrM6rjjzn37Rup-lWxZXYcioIbeMp X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-14_07:2021-04-14,2021-04-14 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Ben Peled Added pcie reset via gpio support as described in the designware-pcie.txt DT binding document. In cases link down cause still exist in device. The device need to be reset to reestablish the link. If reset-gpio pin provided in the device tree, then the linkdown handle resets the device before reestablishing link. Signed-off-by: Ben Peled --- drivers/pci/controller/dwc/pcie-armada8k.c | 24 ++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c index 34b253c..04bba97 100644 --- a/drivers/pci/controller/dwc/pcie-armada8k.c +++ b/drivers/pci/controller/dwc/pcie-armada8k.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "pcie-designware.h" @@ -38,6 +39,8 @@ struct armada8k_pcie { struct regmap *sysctrl_base; u32 mac_rest_bitmask; struct work_struct recover_link_work; + enum of_gpio_flags flags; + struct gpio_desc *reset_gpio; }; #define PCIE_VENDOR_REGS_OFFSET 0x8000 @@ -247,9 +250,18 @@ static void armada8k_pcie_recover_link(struct work_struct *ws) } pci_lock_rescan_remove(); pci_stop_and_remove_bus_device(root_port); + /* Reset device if reset gpio is set */ + if (pcie->reset_gpio) { + /* assert and then deassert the reset signal */ + gpiod_set_value_cansleep(pcie->reset_gpio, 0); + msleep(100); + gpiod_set_value_cansleep(pcie->reset_gpio, + (pcie->flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1); + } /* - * Sleep needed to make sure all pcie transactions and access - * are flushed before resetting the mac + * Sleep used for two reasons. + * First make sure all pcie transactions and access are flushed before resetting the mac + * and second to make sure pci device is ready in case we reset the device */ msleep(100); @@ -369,6 +381,7 @@ static int armada8k_pcie_probe(struct platform_device *pdev) struct armada8k_pcie *pcie; struct device *dev = &pdev->dev; struct resource *base; + int reset_gpio; int ret; pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL); @@ -413,6 +426,13 @@ static int armada8k_pcie_probe(struct platform_device *pdev) goto fail_clkreg; } + /* Config reset gpio for pcie if the reset connected to gpio */ + reset_gpio = of_get_named_gpio_flags(pdev->dev.of_node, + "reset-gpios", 0, + &pcie->flags); + if (gpio_is_valid(reset_gpio)) + pcie->reset_gpio = gpio_to_desc(reset_gpio); + pcie->sysctrl_base = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "marvell,system-controller"); if (IS_ERR(pcie->sysctrl_base)) {