On Thu, Jan 16, 2025 at 07:39:13PM +0530, Manivannan Sadhasivam via B4 Relay wrote: > From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > > The pwrctrl core will rescan the bus once the device is powered on. So > there is no need to continue scanning for the device further. > @@ -2487,7 +2487,14 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) > struct pci_dev *dev; > u32 l; > > - pci_pwrctrl_create_device(bus, devfn); > + /* > + * Create pwrctrl device (if required) for the PCI device to handle the > + * power state. If the pwrctrl device is created, then skip scanning > + * further as the pwrctrl core will rescan the bus after powering on > + * the device. > + */ > + if (pci_pwrctrl_create_device(bus, devfn)) > + return NULL; I assume it's possible for the PCI device to already be powered on even if there's a pwrctrl device for it? Does this change the enumeration order in that case? It sounds like it may delay enumeration of the PCI device until the pwrctrl core rescans the bus? I hope that the enumeration order of all devices that are already powered on at boot time is unchanged. > if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000)) > return NULL; > > -- > 2.25.1 > >
