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 37A7FCD3445 for ; Wed, 6 May 2026 15:25:00 +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=uEEJQ9fXszYfwRyDtR6o0/pUHqmq54B1aA4O008XVv8=; b=t3srsMz+SERFMobCwnXwDBnwc9 Hfhof0Ga8UxLPZzyOK36IU0PpyJxjMjuv2bo5K0mvq8o9SyzM4odkq4Yg08f5wfTCBq5UkvH7qcmn SnSkV0zJ8jww6e2dPvibUsmprhs9X9oIXjgzMZ3/suOMLiSaCsTTc1ZaOPPXeMLEpklMBfQgjLJh4 +2cJY72WE3yP9XDiIE/yImIrx8kH9FRP1IKgcEOz4dSp9kfCbOPgZ8CCC89TDxbQhwi2HKd9U/h0O HNlqcZiQKJMX1y74ZTt9D6hAzMIX3MA7n2tJSO4IoOWLpyaSdztsi5u9U0GTdhhMC7pLuaj7bE+MC 9Q6+nKVA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKe7K-00000001Iz2-1InC; Wed, 06 May 2026 15:24:54 +0000 Received: from m16.mail.163.com ([117.135.210.5]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wKe7G-00000001IuY-3f7q; Wed, 06 May 2026 15:24:51 +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=uE EJQ9fXszYfwRyDtR6o0/pUHqmq54B1aA4O008XVv8=; b=mMb9kc89cru2itfUkh Eh2md/CTuLPUpRJN1UCaVC+R7gJg/05zaFVf6MN375fUdxTcEbLRvm5HGyFiq31g C8tU96NjI4ZuPrcQSVMbckGSM6JiREeQqRoa5JbpvmbpVJG2G04HE0b46cM2H5az 7D+Snzwl538eCInoaS0sk74dM= Received: from zhb.. (unknown []) by gzga-smtp-mtada-g0-0 (Coremail) with SMTP id _____wCHAqsXXftpv5CgDg--.43926S6; Wed, 06 May 2026 23:24:13 +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 4/8] PCI: j721e: Set max_link_speed to enable 100 ms delay after link up Date: Wed, 6 May 2026 23:23:42 +0800 Message-Id: <20260506152346.166056-5-18255117159@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--.43926S6 X-Coremail-Antispam: 1Uf129KBjvJXoW7uF17Jr4UXrWkZF1xZFy5urg_yoW8Gr1xpa y7GFWxG3WIqFW5uanrZ3W5XFyaqFn8J3y7GrZag3WxZFnxCr93JFyIqFyfJ3yfKF4kAF17 A3Zrt342qr43tF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zEt8ncUUUUU= X-Originating-IP: [240e:b8f:927e:5900:dbee:26f0:1b68:48a4] X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/xtbCxB63W2n7XR45DgAA3Q X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260506_082451_318576_B6F8148F X-CRM114-Status: UNSURE ( 8.94 ) 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 Set cdns_pcie.max_link_speed to the maximum supported link speed (obtained from the device tree property "max-link-speed") in j721e_pcie_set_link_speed(). This activates the post-link delay logic added in cdns_pcie_host_start_link() when the controller supports speeds greater than 5 GT/s. As required by PCIe r6.0 sec 6.6.1, and following the same approach as commit 80dc18a0cba8d ("PCI: dwc: Ensure that dw_pcie_wait_for_link() waits 100 ms after link up"), this ensures a 100 ms delay after link training completes before any Configuration Request is sent. Signed-off-by: Hans Zhang <18255117159@163.com> --- drivers/pci/controller/cadence/pci-j721e.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index bfdfe98d5aba..ee85b8e04f5b 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -206,6 +206,7 @@ static int j721e_pcie_set_link_speed(struct j721e_pcie *pcie, (pcie_get_link_speed(link_speed) == PCI_SPEED_UNKNOWN)) link_speed = 2; + pcie->cdns_pcie.max_link_speed = link_speed; val = link_speed - 1; ret = regmap_update_bits(syscon, offset, GENERATION_SEL_MASK, val); if (ret) -- 2.34.1