On Wed, Jan 10, 2024 at 08:37:25AM +0530, Vidya Sagar wrote: > Add support for "preserve-boot-config" property that can be used to > selectively (i.e. per host bridge) instruct the kernel to preserve the > boot time configuration done by the platform firmware. > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx> > --- > V2: > * Addressed issues reported by kernel test robot <lkp@xxxxxxxxx> > > drivers/pci/controller/pci-host-common.c | 5 ++++- > drivers/pci/of.c | 18 ++++++++++++++++++ > drivers/pci/probe.c | 2 +- > include/linux/of_pci.h | 6 ++++++ > 4 files changed, 29 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c > index 6be3266cd7b5..d3475dc9ec44 100644 > --- a/drivers/pci/controller/pci-host-common.c > +++ b/drivers/pci/controller/pci-host-common.c > @@ -68,13 +68,16 @@ int pci_host_common_probe(struct platform_device *pdev) > > of_pci_check_probe_only(); > > + bridge->preserve_config = > + of_pci_check_preserve_boot_config(dev->of_node); Thanks for leveraging the existing "preserve_config" support for the ACPI _DSM. Is pci_host_common_probe() the best place for this? I think there are many DT platform drivers that do not use pci_host_common_probe(), so I wonder if there's a more generic place to put this. I see Rob's concern about adding "preserve-boot-config" vs extending "linux,pci-probe-only" and I don't really have an opinion on that, although I do think the "pci-probe-only" name is not as descriptive as it could be. I guess somebody will argue that "preserve_config" could be more descriptive, too :) Bjorn
