diff options
| author | Lukas Wunner <lukas@wunner.de> | 2018-07-19 17:27:54 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-07-31 11:07:59 -0500 |
| commit | 469e764c4a3c7260b353b7bc1bd56c283cb001da (patch) | |
| tree | 1e07c0b18b5c7ede6ba7208777e660dc1a18f542 /drivers/pci/hotplug | |
| parent | 7903782460ee1813d6779c968b28d0ac71b9b3ae (diff) | |
| download | linux-469e764c4a3c7260b353b7bc1bd56c283cb001da.tar.bz2 | |
PCI: pciehp: Obey compulsory command delay after resume
Upon resume from system sleep, the Slot Control register is written via:
pci_pm_resume_noirq()
pci_pm_default_resume_early()
pci_restore_state()
pci_restore_pcie_state()
PCIe r4.0, sec 6.7.3.2 says that after "issuing a write transaction that
targets any portion of the Port's Slot Control register, [...] software
must wait for [the] command to complete before issuing the next command".
pciehp currently fails to enforce that rule after the above-mentioned
write. Fix it.
(Moving restoration of the Slot Control register to pciehp doesn't seem
to make sense because the other PCIe hotplug drivers may need it as
well.)
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/hotplug')
| -rw-r--r-- | drivers/pci/hotplug/pciehp_core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c index a5bd3b055c0e..3e73b12ed656 100644 --- a/drivers/pci/hotplug/pciehp_core.c +++ b/drivers/pci/hotplug/pciehp_core.c @@ -284,6 +284,10 @@ static int pciehp_resume_noirq(struct pcie_device *dev) struct controller *ctrl = get_service_data(dev); struct slot *slot = ctrl->slot; + /* pci_restore_state() just wrote to the Slot Control register */ + ctrl->cmd_started = jiffies; + ctrl->cmd_busy = true; + /* clear spurious events from rediscovery of inserted card */ if (slot->state == ON_STATE || slot->state == BLINKINGOFF_STATE) pcie_clear_hotplug_events(ctrl); |