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 21C03CD342C for ; Wed, 6 May 2026 15:25:04 +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=qCWWMFDSN/kOWR8DlFD6me9GCJ5creIxlg4thZxsX2U=; b=gldWuaDBEgz4yI11aKY26kOLEo /jxrXyvkIH4HjbzpHnYz7Po1pGgnoAfX9eU4NVW6P50RZL6u8GxKUlcHN8cJKuT6BodNY0vfXU3s9 lpgxZ8+L4JpLBaJ4MKrILgX+llzR6aSjSlQKdV3jjxNi6C7YhlDcxCJDSRztsP5VYDIvDNkX49lvQ ERfRQ61rJ3sk9e9AyDq15yeb5I1kcA7eW5XIGzWKqnIMjMczbZLHFxU/LH2WpGtWWALLi6U4fpJoR em7OcinS3FchVIt9NdMQLATQGQot35d0382XwrFML2VecPA0iGZlGWf566uhtZgaFXXYs6yej2Upi mfN9ZOCw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKe7N-00000001J3I-27se; Wed, 06 May 2026 15:24:57 +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 1wKe7L-00000001Ix8-0UW6; Wed, 06 May 2026 15:24:55 +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=qC WWMFDSN/kOWR8DlFD6me9GCJ5creIxlg4thZxsX2U=; b=hllE0yxFT8/hsbJuSi 2R7v+UgjAVdFGNBZ5Vp9+HdWrR3NGVK2rjNvfG10npkPNWUV1nU7v7Fh406x5nQk YjPykxbwcybUus+apz8TalWSYNz8gDgz/tSxlf/8ZfwLCpzYpGohHZtzV23NGo5F mHgKLs2cp4Krvtp6/Bgu2LBdo= Received: from zhb.. (unknown []) by gzga-smtp-mtada-g0-0 (Coremail) with SMTP id _____wCHAqsXXftpv5CgDg--.43926S3; Wed, 06 May 2026 23:24:10 +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, jianjun.wang@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, 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 v2 1/8] PCI: Add pcie_wait_after_link_train() helper Date: Wed, 6 May 2026 23:23:39 +0800 Message-Id: <20260506152346.166056-2-18255117159@163.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260506152346.166056-1-18255117159@163.com> References: <20260506152346.166056-1-18255117159@163.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: _____wCHAqsXXftpv5CgDg--.43926S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7Cr15uw48KF43tFWkXr4kXrb_yoW8Xw45pa 93CF10kr48XFy3Xws3Ja43WFyYvan3Kay7GrZ7G347KFy7J3W3tF40g3y3Wrnaqrs5Zr13 Jw15Kw17CF4YkFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pif-BAUUUUU= X-Originating-IP: [240e:b8f:927e:5900:dbee:26f0:1b68:48a4] X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/xtbCxBq2Wmn7XRo4wQAA3e X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260506_082455_731307_9A62FE8F X-CRM114-Status: GOOD ( 11.14 ) 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 pcie_wait_after_link_train() 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. The helper uses the existing PCIE_RESET_CONFIG_WAIT_MS macro defined in pci.h. 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/pci.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 4a14f88e543a..a8705a2a2d85 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -60,6 +60,19 @@ struct pcie_tlp_log; */ #define PCIE_RESET_CONFIG_WAIT_MS 100 +/** + * pcie_wait_after_link_train - 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 pcie_wait_after_link_train(int max_link_speed) +{ + if (max_link_speed > 2) + msleep(PCIE_RESET_CONFIG_WAIT_MS); +} + /* Parameters for the waiting for link up routine */ #define PCIE_LINK_WAIT_MAX_RETRIES 10 #define PCIE_LINK_WAIT_SLEEP_MS 90 -- 2.34.1