From: Rafael J. Wysocki Date: Sat, 30 Mar 2013 22:38:02 +0000 (+0100) Subject: PCI/PM: Disable runtime PM of PCIe ports X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=de7d5f729c72638f41d7c17487bccb1c570ff144;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git PCI/PM: Disable runtime PM of PCIe ports The runtime PM of PCIe ports turns out to be quite fragile, as in some cases things work while in some other cases they don't and we don't seem to have a good way to determine whether or not they are going to work in advance. For this reason, avoid enabling runtime PM for PCIe ports by keeping their runtime PM reference counters always above 0 for the time being. When a PCIe port is suspended, it can no longer report events like hotplug, so hotplug below the port may not work, as in the bug report below. [bhelgaas: changelog, stable] Reference: https://bugzilla.kernel.org/show_bug.cgi?id=53811 Signed-off-by: Rafael J. Wysocki Signed-off-by: Bjorn Helgaas CC: stable@vger.kernel.org # v3.6+ --- diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 08c243ab034e..ed4d09498337 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -184,14 +184,6 @@ static const struct dev_pm_ops pcie_portdrv_pm_ops = { #define PCIE_PORTDRV_PM_OPS NULL #endif /* !PM */ -/* - * PCIe port runtime suspend is broken for some chipsets, so use a - * black list to disable runtime PM for these chipsets. - */ -static const struct pci_device_id port_runtime_pm_black_list[] = { - { /* end: all zeroes */ } -}; - /* * pcie_portdrv_probe - Probe PCI-Express port devices * @dev: PCI-Express port device being probed @@ -225,16 +217,11 @@ static int pcie_portdrv_probe(struct pci_dev *dev, * it by default. */ dev->d3cold_allowed = false; - if (!pci_match_id(port_runtime_pm_black_list, dev)) - pm_runtime_put_noidle(&dev->dev); - return 0; } static void pcie_portdrv_remove(struct pci_dev *dev) { - if (!pci_match_id(port_runtime_pm_black_list, dev)) - pm_runtime_get_noresume(&dev->dev); pcie_port_device_remove(dev); pci_disable_device(dev); }