On Wednesday, December 05, 2012 04:33:44 PM Sarah Sharp wrote: > On Wed, Nov 28, 2012 at 02:54:06PM -0800, Sarah Sharp wrote: > > On Mon, Nov 26, 2012 at 10:48:03PM +0100, Bjørn Mork wrote: > > > Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> writes: > > > > > > > It looks like both Ulrich and Andrew have the same issue. I also have a > > > > Lenovo x220, and I confirmed that when I turn on PCI runtime suspend, > > > > the NEC host controller does not report port status changes when a new > > > > USB device is plugged in. > > > > > > > > I'm running 3.6.7, and I'm pretty sure that runtime suspend worked for > > > > the NEC host on some older kernel. I don't think the NEC host went into > > > > D3cold on that kernel, though. Is there a way to disable D3cold and > > > > just use D3hot instead? > > > > > > Yes, you have /sys/bus/pci/devices/.../d3cold_allowed > > > See Documentation/ABI/testing/sysfs-bus-pci > > > > > > If this really is a problem with the D3cold support that went into 3.6 > > > then I guess you should include Huang Ying in the discussions as well > > > (CCed). > > > > Turning off D3 cold didn't help. Once the PCI device is suspended, > > connect events do not generate an interrupt. > > > > I'll go see if I can figure out which kernel this worked on and bisect. > > Wakeup from D3 works fine on the 3.5.0 kernel, but fails on 3.6.2. I > haven't fully bisected yet. > > In debugging, I found that if you only enable runtime suspend for the > NEC host controller, the host successfully comes out of D3 when you plug > in a USB device. However, if you enable runtime PM for the parent PCIe root > port, it stops working. Disabling D3cold for both devices did not help. > > It looks like a PCI issue, so what sort of debugging info do you need > from me? It looks like this is related to one of the following commits: 3d8387e PCI/PM: Fix config reg access for D3cold and bridge suspending ea8c88f PCI/PM: Keep parent bridge active when probing device 4f9c139 PCI/PM: Enable D3/D3cold by default for most devices 448bd85 PCI/PM: add PCIe runtime D3cold support 71a83bd PCI/PM: add runtime PM support to PCIe port ee85f54 ACPI/PM: specify lowest allowed state for device sleep state Generally, please try to bisect changes in drivers/pci between v3.5 and v3.6. Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- 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
