Messages in this thread | | | Date | Tue, 24 Oct 2006 10:13:11 +0200 | From | Stefan Richter <> | Subject | Re: pci_set_power_state() failure and breaking suspend |
| |
Benjamin Herrenschmidt wrote: >> Recently, ohci1394 grew some "proper" error handling in its suspend >> function, something that looks like: >> >> err = pci_set_power_state(pdev, pci_choose_state(pdev, state)); >> if (err) >> goto out; ... > First, it breaks some old PowerBooks where the internal OHCI has no PM > feature exposed on PCI....
Just out of curiosity: Are these HCs actual PCI hardware or are they glued onto an extra PCI interface? Does the startup message of ohci1394 log OHCI 1.1 or 1.0 compliance for them? Probably the latter; OHCI 1.1 was released in January 2000.
OHCI 1.1 says "PCI based 1394 Open Host Controllers /should/ implement PCI Power Management, and implementations that support PCI Power Management /shall/ exhibit behavior consistent with this Annex." (Emphasis mine.) I.e. a compliant HC does either not support power management at all or supports it including the pci_set_power_state() triggered state transitions.
OHCI 1.00 does not have a power management specification. It points to the PCI Local Bus Specification Revision 2.1 though (which I don't have).
We are still working on full power management support by ohci1394 and upper IEEE 1394 layers, so I am glad to get feedback and patches. -- Stefan Richter -=====-=-==- =-=- ==--- http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |