From patchwork Fri Sep 9 08:44:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krishna Chaitanya Chundru X-Patchwork-Id: 12971235 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F8EAECAAA1 for ; Fri, 9 Sep 2022 08:45:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231846AbiIIIpq (ORCPT ); Fri, 9 Sep 2022 04:45:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41656 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231774AbiIIIpb (ORCPT ); Fri, 9 Sep 2022 04:45:31 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 124D7E2291; Fri, 9 Sep 2022 01:45:27 -0700 (PDT) Received: from pps.filterd (m0279868.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 2898a4Yg013286; Fri, 9 Sep 2022 08:45:17 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=kb8qQseZWUATfPCRZc5nzAu2oEou8/t8rUjWQ8Ps+3Y=; b=VAtDlGU2XRxC7A3DD3DtjxeBbHC44Xlj83dGZV6hIZzTEQ8K6hbxEvCOANKHLQSU+5Ay kXoiekkRgM9ni3vsb9gjj4+hWJ50RI5GL4Zd76Gbyhb2RXjHinUgKsCbIo1Zik+Tpop6 eBpIxp3VHzO4EKfJASa6YKB6ejtVDmqqB25KoukA2F26Y4zlS/9qdEfdZDbCuiVInEwy hEIj3ssBB2fMyfHguiQr/+LsMHXdOvjq9vHAzPgPxsXCMu0Yb7cBESbvkyVbGJa7IlFa q+RXJW6BXQWoh1dmwYTdCba9M6UEY52yNWJI2hdhpj2Zaes/4gpKjpBe4WRCl3hrbocA Tg== Received: from apblrppmta02.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3jfrhg9tdu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 09 Sep 2022 08:45:16 +0000 Received: from pps.filterd (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 2898j5bJ014236; Fri, 9 Sep 2022 08:45:05 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 3jc00m8vq2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 09 Sep 2022 08:45:05 +0000 Received: from APBLRPPMTA02.qualcomm.com (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 2898iK7B013119; Fri, 9 Sep 2022 08:45:04 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-krichai-hyd.qualcomm.com [10.213.110.37]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTP id 2898j4Mb014199; Fri, 09 Sep 2022 08:45:04 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 4058933) id B667344AB; Fri, 9 Sep 2022 14:15:03 +0530 (+0530) From: Krishna chaitanya chundru To: helgaas@kernel.org Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, mka@chromium.org, quic_vbadigan@quicinc.com, quic_hemantk@quicinc.com, quic_nitegupt@quicinc.com, quic_skananth@quicinc.com, quic_ramkri@quicinc.com, manivannan.sadhasivam@linaro.org, swboyd@chromium.org, dmitry.baryshkov@linaro.org, Krishna chaitanya chundru , Stanimir Varbanov , Andy Gross , Bjorn Andersson , Konrad Dybcio , Lorenzo Pieralisi , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas Subject: [PATCH v6 2/5] PCI: qcom: Add retry logic for link to be stable in L1ss Date: Fri, 9 Sep 2022 14:14:41 +0530 Message-Id: <1662713084-8106-3-git-send-email-quic_krichai@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1662713084-8106-1-git-send-email-quic_krichai@quicinc.com> References: <1662713084-8106-1-git-send-email-quic_krichai@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: RFDhlk6eYaRSL-nQgg0CIjidNWiKzRyF X-Proofpoint-GUID: RFDhlk6eYaRSL-nQgg0CIjidNWiKzRyF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-09_04,2022-09-09_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 priorityscore=1501 malwarescore=0 mlxlogscore=999 suspectscore=0 clxscore=1015 adultscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2209090030 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Some specific devices are taking time to settle the link in L1ss. So added a retry logic before returning from the suspend op. Signed-off-by: Krishna chaitanya chundru Reported-by: kernel test robot --- drivers/pci/controller/dwc/pcie-qcom.c | 36 +++++++++++++++++++++++----------- 1 file changed, 25 insertions(+), 11 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 6e04d0d..15c2067 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -1809,26 +1809,40 @@ static int qcom_pcie_probe(struct platform_device *pdev) static int __maybe_unused qcom_pcie_pm_suspend(struct qcom_pcie *pcie) { u32 val; + ktime_t timeout, start; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; if (!pcie->cfg->supports_system_suspend) return 0; - /* if the link is not active turn off clocks */ - if (!dw_pcie_link_up(pci)) { - dev_info(dev, "Link is not active\n"); - goto suspend; - } + start = ktime_get(); + /* Wait max 200 ms */ + timeout = ktime_add_ms(start, 200); - /* if the link is not in l1ss don't turn off clocks */ - val = readl(pcie->parf + PCIE20_PARF_PM_STTS); - if (!(val & PCIE20_PARF_PM_STTS_LINKST_IN_L1SUB)) { - dev_warn(dev, "Link is not in L1ss\n"); - return 0; + while (1) { + + if (!dw_pcie_link_up(pci)) { + dev_warn(dev, "Link is not active\n"); + break; + } + + /* if the link is not in l1ss don't turn off clocks */ + val = readl(pcie->parf + PCIE20_PARF_PM_STTS); + if ((val & PCIE20_PARF_PM_STTS_LINKST_IN_L1SUB)) { + dev_dbg(dev, "Link enters L1ss after %d ms\n", + ktime_to_ms(ktime_get() - start)); + break; + } + + if (ktime_after(ktime_get(), timeout)) { + dev_warn(dev, "Link is not in L1ss\n"); + return 0; + } + + udelay(1000); } -suspend: if (pcie->cfg->ops->suspend) pcie->cfg->ops->suspend(pcie);