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([120.60.59.220]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29651c73382sm15036305ad.69.2025.11.05.22.13.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Nov 2025 22:14:03 -0800 (PST) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, bhelgaas@google.com Cc: will@kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, robh@kernel.org, linux-arm-msm@vger.kernel.org, zhangsenchuan@eswincomputing.com, Manivannan Sadhasivam Subject: [PATCH 3/3] PCI: dwc: Skip PME_Turn_Off and L2/L3 transition if no device is available Date: Thu, 6 Nov 2025 11:43:26 +0530 Message-ID: <20251106061326.8241-4-manivannan.sadhasivam@oss.qualcomm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251106061326.8241-1-manivannan.sadhasivam@oss.qualcomm.com> References: <20251106061326.8241-1-manivannan.sadhasivam@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA2MDA0OCBTYWx0ZWRfX0S9c4sRvMMZD +CD3eQO9HLmAKrsWloUHns6bozbdh11bsNwwqBo6Yp9KFtYjaeDMrjmPSByLOer1Mrib3lUM45l LqCyv55rfQ38zMhd62JSCkXSP/MT/OKYrI2MCYrldHtXq4eesRDXK8W1Ib+Fy9FtfKo/f3/M81i QNZI7AwF5ch265GvApLY8gWWJsc46mPps6gnFjMreQe3PGpuycwV31prD1S1QAennLlnbMZ9qYp p/o3vyL9Vw4DIBo6wnugtO3En+aew5G+f/+4ImyzlNdr04lHZ48oIdyqmyE/U3K+msrouSipA3N HXQ6L8Y1G1vfbmDspLW2DgUBt88L1lxRDK6FmrriXYHFFlF5v3IcZTRLoRoi02FlMwc/2NWCR1H etZkIe7CJM0qXqIJs0X8CyCSJ7tZxw== X-Proofpoint-ORIG-GUID: 5tG48-pZGCSQt1ezTnhrmIOyLF-X2T9_ X-Authority-Analysis: v=2.4 cv=OZSVzxTY c=1 sm=1 tr=0 ts=690c3cad cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=tomDxdmRQcfPzRosr6lsLA==:17 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=JlmoTVlqZe2UTokRIjkA:9 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-GUID: 5tG48-pZGCSQt1ezTnhrmIOyLF-X2T9_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-06_01,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 adultscore=0 clxscore=1015 spamscore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511060048 Content-Type: text/plain; charset="utf-8" If there is no device available under the Root Ports, there is no point in sending PME_Turn_Off and waiting for L2/L3 transition, it will result in a timeout. Hence, skip those steps if no device is available during suspend. The resume flow remains unchanged. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pc= i/controller/dwc/pcie-designware-host.c index 20c9333bcb1c..b6b8139e91e3 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -20,6 +20,7 @@ #include =20 #include "../../pci.h" +#include "../pci-host-common.h" #include "pcie-designware.h" =20 static struct pci_ops dw_pcie_ops; @@ -1129,6 +1130,9 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) u32 val; int ret; =20 + if (!pci_root_ports_have_device(pci->pp.bridge->bus)) + goto stop_link; + /* * If L1SS is supported, then do not put the link into L2 as some * devices such as NVMe expect low resume latency. @@ -1162,6 +1166,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) */ udelay(1); =20 +stop_link: dw_pcie_stop_link(pci); if (pci->pp.ops->deinit) pci->pp.ops->deinit(&pci->pp); --=20 2.48.1