Messages in this thread | | | Date | Tue, 19 Mar 2013 15:46:55 +0000 | From | Chris Clayton <> | Subject | Re: 3.8.0-rc4+ - Oops on removing WinTV-HVR-1400 expresscard TV Tuner |
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Hi Bjorn,
Sorry I meant to reply to your mail so that copy recipients will know the outcome of the things you asked me to do. But then I forgot. Doh! You should have received the attachment notification from bugzilla, I think.
On 03/15/13 22:48, Bjorn Helgaas wrote: > On Tue, Mar 12, 2013 at 4:20 PM, Bjorn Helgaas <bhelgaas@google.com> wrote: >> On Sat, Mar 9, 2013 at 2:20 AM, Chris Clayton <chris2553@googlemail.com> wrote: >>> On 03/08/13 22:57, Bjorn Helgaas wrote: > >>>> Thanks. I opened this bug report: >>>> https://bugzilla.kernel.org/show_bug.cgi?id=54981 to keep track of >>>> your logs. > > Hi Chris, > > The current Linux acpiphp driver doesn't do anything unless it finds > devices with _EJ0 or _RMV methods, and your DSDT has neither. But I > think that implementation is incorrect because I'm not convinced that > those methods are required in order to do hotplug via ACPI. For > example, your DSDT *does* have an _L01 method that does notifications > to the root ports. I suspect that hotplug events on your box generate > an SCI that invokes that method. Linux basically ignores the > resulting notify events, and I suspect that hotplug works on Windows > because it is paying attention to them. > > Can you build a kernel with CONFIG_ACPI_DEBUG=y, do the following, and > attach all the output to the bugzilla? > > 1) Boot with empty ExpressCard slot (without using "pcie_ports=native") > 2) # echo 0x00010004 > /sys/module/acpi/parameters/debug_layer > 3) # echo 0x08000004 > /sys/module/acpi/parameters/debug_level > 4) # lspci -vv > 5) # setpci -s 1c.3 0x42.w > 6) # setpci -s 1c.3 0x5a.w > 7) # setpci -s 1c.3 0xd8.l > 8) Insert ExpressCard > 9) # setpci -s 1c.3 0x5a.w > 10) # dmesg > > Here's what I think we'll see: > > - Slot Implemented (bit 8 of XCAP at 0x42) set, indicating a slot is > implemented below this root port > - Hot Plug SCI Enable (bit 30 of MPC at 0xd8) set, indicating that the > root port should generate an SCI whenever a hotplug event is detected > - Presence Detect State (bit 6 of SLTSTS at 0x5a) change from 0 with > the slot empty to 1 with the slot occupied > - pciehp doing nothing (since _OSC didn't grant the OS permission to > use PCIe native hotplug) > - dmesg indication of the SCI, leading to a Bus Check notification to > \_SB.PCI0.RP04, which is the 1c.3 root port leading to the ExpressCard > slot >
As far as I can see, your predicted outcomes where correct. I've added the logs to the bugzilla report.
> A Bus Check notification means we're supposed to re-enumerate starting > at that device. If we *did* re-enumerate, we would find the new > ExpressCard. > > Thanks, > Bjorn >
Thanks, Chris
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