From patchwork Fri Nov 15 10:30:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna chaitanya chundru X-Patchwork-Id: 13876061 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B6CCD1B4F0F; Fri, 15 Nov 2024 10:30:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731666649; cv=none; b=XLZ+Xw+TPdsXaC1iAhcRPdqWTljYwkZ8ULspADdX05mo3O9QrI5ZndxlXlZVvLsNsD+r1UJE3IoAlnzKBq6/+1xBk1TC4Uow1QZlst8wuMUihoOPhWQ6sd6wwzrgq/r7IDTTPxONa+xmf8utQ0dBnQxs6550t9ZJyFnNcsj8YaE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731666649; c=relaxed/simple; bh=VbDv3VmH4BfqeU0tgRfXeULFVj1/pBCdJ7CHRcqO1uU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-ID:References: In-Reply-To:To:CC; b=uJn+zUUfiVFi/wyW2ey2JZotJ4RQh+H00CYnZpAsoaKFJuAU1xCqdaJUdkkzFJaqg6pwyRKk7nOvwcizJxTKpk4y2tpBaaffl8dG173KUWRjNC1fFeEWQw7Yu2CQtiDFKc6dOev1T6qauJwDIHniejwHd4UD/JrRWaiEQ+zPI6I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=AMkbm3pI; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="AMkbm3pI" Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4AF9E0o7005146; Fri, 15 Nov 2024 10:30:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= eGwr6qJXD1dZwYMwMOVIOVRmHcCIRn7koaz4FfucVgU=; b=AMkbm3pIdYDf0ZDr IjC03TJHqW9g2Wt16kzNH0qe2PDE0FJ8+1M7elh1tAgMuD2jBTYqO+FvNmUYFjIF spD+EOeECEyuAfkK2D++ixrRpZeJX4WRHJBJX0WI5StCecv5PYDAyTlVguLro0Ld z+HK6qj1hcqSJTjpECLGtAdY2DEkK/hiVLuzJhsEn7zxAWUruCdDaTSYabGlRLxH 2PpJFLaHyXVAhgzQ68Vk4BjpVm5PdDZSg+Je7iHSd4w+9DSgkVUeo5jkd948CmnN 4W6TjIBZffp+9BSY+WiE4PaKloyZedugvRNzBB4jgxae+T9yY8wA+vcpSB+DkP5S DSS5ng== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 42x3g0r7uf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Nov 2024 10:30:37 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4AFAUaBs005953 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Nov 2024 10:30:36 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 15 Nov 2024 02:30:32 -0800 From: Krishna chaitanya chundru Date: Fri, 15 Nov 2024 16:00:21 +0530 Subject: [PATCH v4 1/3] PCI: dwc: Skip waiting for link up if vendor drivers can detect Link up event Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20241115-remove_wait1-v4-1-7e3412756e3d@quicinc.com> References: <20241115-remove_wait1-v4-0-7e3412756e3d@quicinc.com> In-Reply-To: <20241115-remove_wait1-v4-0-7e3412756e3d@quicinc.com> To: Jingoo Han , Manivannan Sadhasivam , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Rob Herring , Bjorn Helgaas , Konrad Dybcio CC: , , , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , , , , Krishna chaitanya chundru X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1731666627; l=1812; i=quic_krichai@quicinc.com; s=20230907; h=from:subject:message-id; bh=VbDv3VmH4BfqeU0tgRfXeULFVj1/pBCdJ7CHRcqO1uU=; b=e4MCwvIySteGarsyItU3a5dgpd2BB6gxVhbyhGZUaA05k19I2TjrD3UuOS72f2P4J1dAi4R7M PEwhx7ZJxT/CUEA9QeXcGKkdAZtREowYDpXFa1S36rgj3BVGdGmjha9 X-Developer-Key: i=quic_krichai@quicinc.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: paOokC8OoKEq3K1kz5m3ylI5LsOxnP1b X-Proofpoint-GUID: paOokC8OoKEq3K1kz5m3ylI5LsOxnP1b X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 adultscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 clxscore=1015 spamscore=0 mlxlogscore=935 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411150089 If the vendor drivers can detect the Link up event using mechanisms such as Link up IRQ and can the driver can enumerate downstream devices instead of waiting here, then waiting for Link up during probe is not needed here, which optimizes the boot time. So skip waiting for link to be up if the driver supports 'linkup_irq'. Signed-off-by: Krishna chaitanya chundru Reviewed-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-designware-host.c | 10 ++++++++-- drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 3e41865c7290..c8208a6c03d1 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -530,8 +530,14 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp) goto err_remove_edma; } - /* Ignore errors, the link may come up later */ - dw_pcie_wait_for_link(pci); + /* + * Note: The link up delay is skipped only when a link up IRQ is present. + * This flag should not be used to bypass the link up delay for arbitrary + * reasons. + */ + if (!pp->use_linkup_irq) + /* Ignore errors, the link may come up later */ + dw_pcie_wait_for_link(pci); bridge->sysdata = pp; diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 347ab74ac35a..1d0ec47e1986 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -379,6 +379,7 @@ struct dw_pcie_rp { bool use_atu_msg; int msg_atu_index; struct resource *msg_res; + bool use_linkup_irq; }; struct dw_pcie_ep_ops {