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[199.106.103.52]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-12c837f7feasm4775458c88.0.2026.04.19.02.39.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Apr 2026 02:39:41 -0700 (PDT) From: Shawn Guo To: Manivannan Sadhasivam Cc: Lorenzo Pieralisi , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Qiang Yu , linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Shawn Guo Subject: [PATCH] PCI: qcom: Disable ASPM L0s for SA8775P Date: Sun, 19 Apr 2026 17:39:34 +0800 Message-ID: <20260419093934.1223027-1-shengchao.guo@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 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: AW1haW4tMjYwNDE5MDA5OSBTYWx0ZWRfX3uuhhsi1fUJl lOdR9wFVxMUN667Y9EJuz75HbxTsj12xQA7ygWyI5pK4dVlK0QX/5Sx1UftKxHLdidltp7R5Sxe v3U/yclnOrJDa2I9ObLoAYRMb5cA5n695B+Xm0dkrLfa7/el5bM40fJbNWJLRGPjfiTbZf/3Ksc 3asJpLjyXnBydaa/NvGNSdrt40/dAOXzB3Q2n/FR4JdN0uyLOJfA2ugkFz3f4ixDhh/e1ngox80 xAZsPuOdkNrLhvHPDt1dK/d37Gib3u006zFNO36fBxxm344PEpWIbk8bXArn4fs+Dh9B1SRWrDQ VUgbYONitaPzehD7hFHU2OzPapMRpgyb8VmlnRIRRrrbrzvSvKRP1HTfaCsj2L2iNqIhuv6BsKZ mee6xnhmznSvqlkuze4tEj3ve1HE40sBS/qiFavJpmYyqxLdXnxjg/Xu6ka/bwrKaATLAsIwE1C ylyJBK6H6b2KQiAAcmw== X-Proofpoint-GUID: IiTGGGtd9D14emg7RmK96M-uu-bXXwto X-Proofpoint-ORIG-GUID: IiTGGGtd9D14emg7RmK96M-uu-bXXwto X-Authority-Analysis: v=2.4 cv=WK1PmHsR c=1 sm=1 tr=0 ts=69e4a2e0 cx=c_pps a=bS7HVuBVfinNPG3f6cIo3Q==:117 a=b9+bayejhc3NMeqCNyeLQQ==:17 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=z6wLorOCBPHxKQej3YQA:9 a=vBUdepa8ALXHeOFLBtFW:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-19_03,2026-04-17_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 spamscore=0 malwarescore=0 bulkscore=0 suspectscore=0 phishscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604190099 Content-Type: text/plain; charset="utf-8" Commit f5cd8a929c82 ("PCI: dwc: Remove MSI/MSIX capability for Root Port if iMSI-RX is used as MSI controller") removed MSI/MSI-X capabilities from the Root Port on platforms using iMSI-RX (including SA8775P, which has no msi-parent/msi-map in DT). This causes PME and AER service drivers to fall back from MSI to INTx. With INTx-based PME active, the QCN9100 modem endpoint sends PME messages during D-state transitions early in boot. The level-triggered INTx assertion coincides with ASPM L0s exit sequencing on SA8775P hardware, causing Data Link Layer Replay Timer Timeout errors on both sides of the link. [ 13.069528] pcieport 0000:00:00.0: PME: Signaling with IRQ 332 [ 13.082436] pcieport 0000:00:00.0: AER: enabled with IRQ 332 [ 13.082447] pcieport 0000:00:00.0: AER: Correctable error message receiv= ed from 0000:01:00.0 [ 13.101347] pci 0000:01:00.0: PCIe Bus Error: severity=3DCorrectable, ty= pe=3DData Link Layer, (Transmitter ID) [ 13.111281] pci 0000:01:00.0: device [17cb:1103] error status/mask=3D0= 0001000/0000e000 [ 13.111284] pci 0000:01:00.0: [12] Timeout [ 13.111313] pcieport 0000:00:00.0: AER: Multiple Correctable error messa= ge received from 0000:01:00.0 [ 13.130512] pcieport 0000:00:00.0: PCIe Bus Error: severity=3DCorrectabl= e, type=3DData Link Layer, (Transmitter ID) [ 13.130514] pcieport 0000:00:00.0: device [17cb:0115] error status/mas= k=3D00001000/0000e000 [ 13.130516] pcieport 0000:00:00.0: [12] Timeout Fix the PCIe regression on SA8775P/Lemans platform by adding no_l0s =3D true to cfg_1_34_0 for SA8775P, so that PCI_EXP_LNKCAP_ASPM_L0S is cleared from the Root Port and ASPM L0s is prevented from being negotiated. Fixes: f5cd8a929c82 ("PCI: dwc: Remove MSI/MSIX capability for Root Port if= iMSI-RX is used as MSI controller") Assisted-by: Claude:claude-4-6-sonnet Signed-off-by: Shawn Guo --- drivers/pci/controller/dwc/pcie-qcom.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controlle= r/dwc/pcie-qcom.c index af6bf5cce65b..6a14b5091338 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -1473,6 +1473,7 @@ static const struct qcom_pcie_cfg cfg_1_9_0 =3D { static const struct qcom_pcie_cfg cfg_1_34_0 =3D { .ops =3D &ops_1_9_0, .override_no_snoop =3D true, + .no_l0s =3D true, }; =20 static const struct qcom_pcie_cfg cfg_2_1_0 =3D { --=20 2.43.0