Hello Mike, Mathias, list,
On 06.02.2016 19:08, Mike Murdoch wrote:
> Bug ID: 111251
>
> I have a NEC uPD720200 USB3.0 controller in a Thinkpad W520 laptop on
> kernel 4.4.1-gentoo.
>
> 0e:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host
> Controller (rev 04) (prog-if 30 [XHCI])
> Subsystem: Lenovo uPD720200 USB 3.0 Host Controller
> Flags: bus master, fast devsel, latency 0
> Memory at f3800000 (64-bit, non-prefetchable) [size=8K]
> Capabilities: [50] Power Management version 3
> Capabilities: [70] MSI: Enable- Count=1/8 Maskable- 64bit+
> Capabilities: [90] MSI-X: Enable+ Count=8 Masked-
> Capabilities: [a0] Express Endpoint, MSI 00
> Capabilities: [100] Advanced Error Reporting
> Capabilities: [140] Device Serial Number ff-ff-ff-ff-ff-ff-ff-ff
> Capabilities: [150] Latency Tolerance Reporting
> Kernel driver in use: xhci_hcd
> Kernel modules: xhci_pci
>
> When runtime power control for this controller is disabled
> (/sys/bus/pci/devices/0000:0e:00.0/power/control = on), the controller
> works fine and reaches over 120MB/s transfer rates.
>
> When runtime power control for this controller is enabled
> (/sys/bus/pci/devices/0000:0e:00.0/power/control = auto), two effects
> can be observed:
>
> - Transfer rates are much lower at around 30MB/s
> - During transfers, the controller dies after a couple of seconds:
I found this message in the list archives, and I have the exact same
issues on exactly the same hardware (Thinkpad W520 laptop with the same
USB3 controller showing on lspci -v); otherwise, I'm running distro kernel
2.6.32-573.7.1.el6.x86_64 on a Springdale Linux 6.7 (RHEL6) install.
I just verified that my controller's PM was set by default to "auto":
cat /sys/bus/pci/devices/0000\:0e\:00.0/power/control
auto
I have now set it to "on" and will test whether this will work around
the issue (I'm waiting for my USB3.0 "heavy duty" disk docks to be
released from another system that is using them right now).
I have one question for Mike: have you upgraded your uPD720200 controller
firmware (as per [1], [2]) or are you still running stock?
Also, one question for Mathias: do you know whether your patches at [3]
can be applied to kernel 2.6.32?
References
[1] https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/Anyone-updated-their-W520-USB-3-0-firmware/td-p/1164719
[2] http://pete.akeo.ie/2011/10/flashing-necrenesas-usb-30.html
[3] http://marc.info/?l=linux-usb&m=145684596900873&w=2
Cheers,
--
Durval Menezes (durval AT tmp DOT com DOT br, http://www.tmp.com.br/)
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