On Sun, 27 Dec 2009 21:02:22 +0100 "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: > From: Rafael J. Wysocki <rjw@xxxxxxx> > > Apparently, some machines may have problems with PCI run-time power > management if MSIs are used for the hative PCIe PME signaling. In > particular, on the MSI Wind U-100 PCIe PME interrupts are not > generated by a PCIe root port after a resume from suspend to RAM, if > the system wake-up was triggered by a PME from the device attached to > this port. [It doesn't help to free the interrupt on suspend and > request it back on resume, even if that is done along with disabling > the MSI and re-enabling it, respectively.] However, if INTx > interrupts are used for this purpose on the same machine, everything > works just fine. > > For this reason, add a kernel command line switch allowing one to > request that MSIs be not used for the native PCIe PME signaling, > introduce a DMI table allowing us to blacklist machines that need > this switch to be set by default and put the MSI Wind U-100 into this > table. > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > --- This scares me a little... seems like we're not restoring some state on resume that's needed for MSIs to work? Looks fine though. -- Jesse Barnes, 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
