On Wed, Apr 06, 2022 at 09:00:52PM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > Currently, endpoint devices may not be powered up entirely during > runtime resume that follows a D3hot -> D0 transition of the parent > bridge. > > Namely, even if the power state of an endpoint device, as indicated > by its PCI_PM_CTRL register, is D0 after powering up its parent > bridge, it may be still necessary to bring its ACPI companion into > D0 and that should be done before accessing it. However, the current > code assumes that reading the PCI_PM_CTRL register is sufficient to > establish the endpoint device's power state, which may lead to > problems. > > Address that by forcing a power-up of all PCI devices, including the > platform firmware part of it, during runtime resume. > > Link: https://lore.kernel.org/linux-pm/11967527.O9o76ZdvQC@kreacher > Fixes: 5775b843a619 ("PCI: Restore config space on runtime resume despite being unbound") > Reported-by: Abhishek Sahu <abhsahu@xxxxxxxxxx> > Tested-by: Abhishek Sahu <abhsahu@xxxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
