From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C25F1CD37BE for ; Mon, 11 May 2026 06:00:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cftsOZtxX29kXCinzIdqB457AE+U27lG7aeLpYLPKCg=; b=fSlhtKliBM/V8fyLCmJQEQdLWP JgK6jYLmMXimtFPCDnRcHrObNgkk+arQnZIY/AImBr8qpo/SkbrIztzO914A+VCiORnbSPiQM10w9 oJECD1MRzcVrN5fLpddxn6zvD0ycq/Dh6l70ytvWFpmsMqULJHRIyvtBFVVKByoxVEmDEv7uJ7045 /6kO0xtrU5ILFSTYvZFoS76tAsVii3SkYNVg7okFwFwbmxMy1JmjzssU8kwIzlC6lDP3DzghjRMuU LOjwmZepP51jhFaDMMzBZxhsoRSNfHP0YC9z/vTgHhUW/Dx+Mw0AOlf5ztCn1ds7zd7SzFDskrkmh Rcm9qh4g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMJgf-0000000CQbR-2K6S; Mon, 11 May 2026 06:00:17 +0000 Received: from m16.mail.163.com ([117.135.210.2]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMJgb-0000000CQZW-3xM6; Mon, 11 May 2026 06:00:16 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=cf tsOZtxX29kXCinzIdqB457AE+U27lG7aeLpYLPKCg=; b=AOGpWrBklUKzXiHe2e RmH+uBtaO+tn+gDtsITdEf3uD00xsvLlIzYTWEKKYgjPmqae3s74XytRXwTM7MSm GfmPj4SYpIVWELdmhCsmrNnyG2z6I35CmztiTlg6+1AB2Ogdr9s4kQ9Lec2m4NBb lU+4ubeQT0WG3InU0r7WRV538= Received: from Precision-7960.. (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wDn9yk8cAFqPHQVAw--.46705S3; Mon, 11 May 2026 13:59:27 +0800 (CST) From: Hans Zhang <18255117159@163.com> To: bhelgaas@google.com, lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, vigneshr@ti.com, jingoohan1@gmail.com, thomas.petazzoni@bootlin.com, pali@kernel.org, ryder.lee@mediatek.com, claudiu.beznea.uj@bp.renesas.com, mpillai@cadence.com Cc: robh@kernel.org, s-vadapalli@ti.com, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, claudiu.beznea@tuxon.dev, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Zhang <18255117159@163.com> Subject: [PATCH v3 1/7] PCI: Add pci_host_common_link_train_delay() helper Date: Mon, 11 May 2026 13:59:17 +0800 Message-Id: <20260511055923.37117-2-18255117159@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260511055923.37117-1-18255117159@163.com> References: <20260511055923.37117-1-18255117159@163.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: _____wDn9yk8cAFqPHQVAw--.46705S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7Cr15uw48KryxGryDtF4fZrb_yoW8CFyrpa 98AF13CF40grW3uwsxAa4DWryYq3Z5t3yUK397G3sayr9rtrsavFWv93yIqF1rJFZ8Zr17 A3W5K3Z7Cr4xtF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piGNtfUUUUU= X-Originating-IP: [140.206.53.66] X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/xtbCwwAHqmoBcEDaRwAA3o X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260510_230014_876086_70B474B1 X-CRM114-Status: UNSURE ( 9.42 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org PCIe r6.0, sec 6.6.1 (Conventional Reset) requires that for a Downstream Port supporting Link speeds greater than 5.0 GT/s, software must wait a minimum of 100 ms after Link training completes before sending any Configuration Request. Introduce a static inline helper pci_host_common_link_train_delay() that checks the given max_link_speed (2 = 5.0 GT/s, 3 = 8.0 GT/s, etc.) and calls msleep(100) only when the speed is greater than 5.0 GT/s. This allows multiple host controller drivers to share the same mandatory delay without duplicating the logic. Signed-off-by: Hans Zhang <18255117159@163.com> --- drivers/pci/controller/pci-host-common.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/pci/controller/pci-host-common.h b/drivers/pci/controller/pci-host-common.h index b5075d4bd7eb..d709f7e3e11a 100644 --- a/drivers/pci/controller/pci-host-common.h +++ b/drivers/pci/controller/pci-host-common.h @@ -10,6 +10,9 @@ #ifndef _PCI_HOST_COMMON_H #define _PCI_HOST_COMMON_H +#include +#include "../pci.h" + struct pci_ecam_ops; int pci_host_common_probe(struct platform_device *pdev); @@ -20,4 +23,18 @@ void pci_host_common_remove(struct platform_device *pdev); struct pci_config_window *pci_host_common_ecam_create(struct device *dev, struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops); + +/** + * pci_host_common_link_train_delay - Wait 100 ms if link speed > 5 GT/s + * @max_link_speed: the maximum link speed (2 = 5.0 GT/s, 3 = 8.0 GT/s, ...) + * + * Must be called after Link training completes and before the first + * Configuration Request is sent. + */ +static inline void pci_host_common_link_train_delay(int max_link_speed) +{ + if (max_link_speed > 2) + msleep(PCIE_RESET_CONFIG_WAIT_MS); +} + #endif -- 2.34.1