The PCI PM 1.2 specification requires minimum of 50ms before function on a bus is accessed after the bus is transitioned from B2 to B0. Now that we actually power down bridges we should make sure the specification is followed accordingly. Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> --- Hi Bjorn, Since this is only needed when bridges are powered down, I think it makes sense to put this to your pci/pm branch. drivers/pci/pci.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e785dc260e72..e645a3d4f2e0 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2361,7 +2361,12 @@ void pci_pm_init(struct pci_dev *dev) } dev->pm_cap = pm; - dev->d3_delay = PCI_PM_D3_WAIT; + /* + * PCI PM 1.2 specification requires minimum of 50ms before any + * function on the bus is accessed after the bus is transitioned + * from B2 to B0. + */ + dev->d3_delay = pci_is_bridge(dev) ? PCI_PM_BUS_WAIT : PCI_PM_D3_WAIT; dev->d3cold_delay = PCI_PM_D3COLD_WAIT; dev->bridge_d3 = pci_bridge_d3_possible(dev); dev->d3cold_allowed = true; -- 2.8.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
