On Mon, Jul 15, 2024 at 11:13:28AM GMT, Mayank Rana wrote: > Based on previously received feedback, this patch series adds functionalities > with existing PCIe host generic ECAM driver (pci-host-generic.c) to get PCIe > host root complex functionality on Qualcomm SA8775P auto platform. > > Previously sent RFC patchset to have separate Qualcomm PCIe ECAM platform driver: > https://lore.kernel.org/all/d10199df-5fb3-407b-b404-a0a4d067341f@xxxxxxxxxxx/T/ > > 1. Interface to allow requesting firmware to manage system resources and performing > PCIe Link up (devicetree binding in terms of power domain and runtime PM APIs is used in driver) > 2. Performing D3 cold with system suspend and D0 with system resume (usage of GenPD > framework based power domain controls these operations) > 3. SA8775P is using Synopsys Designware PCIe controller which supports MSI controller. > This MSI functionality is used with PCIe host generic driver after splitting existing MSI > functionality from pcie-designware-host.c file into pcie-designware-msi.c file. Please excuse me my ignorance if this is described somewhere. Why are you using DWC-specific MSI handling instead of using GIC ITS? > Below architecture is used on Qualcomm SA8775P auto platform to get ECAM compliant PCIe > controller based functionality. Here firmware VM based PCIe driver takes care of resource > management and performing PCIe link related handling (D0 and D3cold). Linux VM based PCIe > host generic driver uses power domain to request firmware VM to perform these operations > using SCMI interface. -- With best wishes Dmitry
