On Fri, Jul 12, 2024 at 02:24:11PM +0800, Kai-Heng Feng wrote: > Some laptops wake up after poweroff when HP Thunderbolt Dock G4 is > connected. > > The following error message can be found during shutdown: > pcieport 0000:00:1d.0: AER: Correctable error message received from 0000:09:04.0 > pcieport 0000:09:04.0: PCIe Bus Error: severity=Correctable, type=Data Link Layer, (Receiver ID) > pcieport 0000:09:04.0: device [8086:0b26] error status/mask=00000080/00002000 > pcieport 0000:09:04.0: [ 7] BadDLLP > > Calling aer_remove() during shutdown can quiesce the error message, > however the spurious wakeup still happens. > > The issue won't happen if the device is in D3 before system shutdown, so > putting device to low power state before shutdown to solve the issue. > > I don't have a sniffer so this is purely guesswork, however I believe > putting device to low power state it's the right thing to do. My objection here is that we don't have an explanation of why this should matter or a pointer to any spec language about this situation, so it feels a little bit random. I suppose the problem wouldn't happen if AER interrupts were disabled? We already do disable them in aer_suspend(), but maybe that's not used in the shutdown path? My understanding is that .shutdown() should turn off device interrupts and stop DMA. So maybe we need an aer_shutdown() that disables interrupts? > Link: https://bugzilla.kernel.org/show_bug.cgi?id=219036 > Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> > --- > drivers/pci/pci-driver.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c > index af2996d0d17f..4c6f66f3eb54 100644 > --- a/drivers/pci/pci-driver.c > +++ b/drivers/pci/pci-driver.c > @@ -510,6 +510,14 @@ static void pci_device_shutdown(struct device *dev) > if (drv && drv->shutdown) > drv->shutdown(pci_dev); > > + /* > + * If driver already changed device's power state, it can mean the > + * wakeup setting is in place, or a workaround is used. Hence keep it > + * as is. > + */ > + if (!kexec_in_progress && pci_dev->current_state == PCI_D0) > + pci_prepare_to_sleep(pci_dev); > + > /* > * If this is a kexec reboot, turn off Bus Master bit on the > * device to tell it to not continue to do DMA. Don't touch > -- > 2.43.0 >
