[PATCH V2 0/7] Add power domain and MSI functionality with PCIe host generic ECAM driver

[Dmitry Baryshkov]

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@quicinc.com/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