On 15.07.2024 7:33 PM, Manivannan Sadhasivam via B4 Relay wrote: > From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > > Historically, Qcom PCIe RC controllers lack standard hotplug support. So > when an endpoint is attached to the SoC, users have to rescan the bus > manually to enumerate the device. But this can be avoided by simulating the > PCIe hotplug using Qcom specific way. > > Qcom PCIe RC controllers are capable of generating the 'global' SPI > interrupt to the host CPUs. The device driver can use this event to > identify events such as PCIe link specific events, safety events etc... > > One such event is the PCIe Link up event generated when an endpoint is > detected on the bus and the Link is 'up'. This event can be used to > simulate the PCIe hotplug in the Qcom SoCs. > > So add support for capturing the PCIe Link up event using the 'global' > interrupt in the driver. Once the Link up event is received, the bus > underneath the host bridge is scanned to enumerate PCIe endpoint devices, > thus simulating hotplug. > > All of the Qcom SoCs have only one rootport per controller instance. So > only a single 'Link up' event is generated for the PCIe controller. > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > --- Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> Konrad
