On Wed, Jun 09, 2021 at 12:52:37AM +0530, Vidya Sagar wrote: > Hi, > I would like to know what is the use of pcie-designware-plat.c file. This > looks like a skeleton file and can't really work with any specific hardware > as such. > Some context for this mail thread is, if the config CONFIG_PCIE_DW_PLAT is > enabled in a system where a Synopsys DesignWare IP based PCIe controller is > present and its configuration is enabled (Ex:- Tegra194 system with > CONFIG_PCIE_TEGRA194_HOST enabled), then, it can so happen that the probe of > pcie-designware-plat.c called first (because all DWC based PCIe controller > nodes have "snps,dw-pcie" compatibility string) and can crash the system. What's the crash? If a device claims to be compatible with "snps,dw-pcie" and pcie-designware-plat.c claims to know how to operate "snps,dw-pcie" devices, it seems like something is wrong. "snps,dw-pcie" is a generic device type, so pcie-designware-plat.c might not know how to operate device-specific details of some of those devices, but basic functionality should work and it certainly shouldn't crash. Bjorn
