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authorHuang Ying <ying.huang@intel.com>2012-08-08 09:07:38 +0800
committerBjorn Helgaas <bhelgaas@google.com>2012-08-21 17:31:40 -0600
commit4f9c1397e2e80e52b17ec4e39760caa807bd15c7 (patch)
tree60007cc7b7511df5db7e6705929ba01d9a96b97d /drivers/pci
parenta6b881a5b8d4fa2135e55a74be6d6b1e17e445dd (diff)
PCI/PM: Enable D3/D3cold by default for most devices
This patch fixes the following bug: http://marc.info/?l=linux-usb&m=134318961120825&w=2 Originally, device lower power states include D1, D2, D3. After that, D3 is further divided into D3hot and D3cold. To support both scenario safely, original D3 is mapped to D3cold. When adding D3cold support, because worry about some device may have broken D3cold support, D3cold is disabled by default. This disable D3 on original platform too. But some original platform may only have working D3, but no working D1, D2. The root cause of the above bug is it too. To deal with this, this patch enables D3/D3cold by default for most devices. This restores the original behavior. For some devices that suspected to have broken D3cold support, such as PCIe port, D3cold is disabled by default. Reported-by: Bjorn Mork <bjorn@mork.no> Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c1
-rw-r--r--drivers/pci/pcie/portdrv_pci.c5
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index f3ea977a5b1..ab4bf5a4c2f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1941,6 +1941,7 @@ void pci_pm_init(struct pci_dev *dev)
dev->pm_cap = pm;
dev->d3_delay = PCI_PM_D3_WAIT;
dev->d3cold_delay = PCI_PM_D3COLD_WAIT;
+ dev->d3cold_allowed = true;
dev->d1_support = false;
dev->d2_support = false;
diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
index 3a7eefcb270..62f5a76c8f8 100644
--- a/drivers/pci/pcie/portdrv_pci.c
+++ b/drivers/pci/pcie/portdrv_pci.c
@@ -200,6 +200,11 @@ static int __devinit pcie_portdrv_probe(struct pci_dev *dev,
return status;
pci_save_state(dev);
+ /*
+ * D3cold may not work properly on some PCIe port, so disable
+ * it by default.
+ */
+ dev->d3cold_allowed = false;
if (!pci_match_id(port_runtime_pm_black_list, dev))
pm_runtime_put_noidle(&dev->dev);