Hi, We are using Linux 5.10 on a HPE Proliant m400 machine with an XGene PCIe bridge. The machine works well on some earlier versions like 5.4 but fails to set up the PCIe bridge on 5.10. Running `lscpi` on 5.4 shows: 00:00.0 PCI bridge: Applied Micro Circuits Corp. X-Gene PCIe bridge (rev 04) 01:00.0 Ethernet controller: Mellanox Technologies MT27520 Family [ConnectX-3 Pro] while on 5.10 it shows nothing. The earliest commit we found that causes the bug is https://lore.kernel.org/linux-pci/20200602171601.17630-1-zhengdejin5@xxxxxxxxx/ which changes the file drivers/pci/controller/pci-xgene.c by wrapping the call of devm_platform_ioremap_resource_byname into platform_get_resource_byname. By reverting the change, the PCIe bridge works now. We are curious why this patch can cause the issue. Additionally, this bug still exists on 5.10.19 and reverting the above patch also fixed the issue. Any help would be appreciated! -- Xuheng Li
