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ae8963adb4
linux/drivers/usb/core
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Sarah Sharp ae8963adb4 usb: Don't enable LPM if the exit latency is zero. 
Some USB 3.0 devices signal that they don't implement Link PM by having
all zeroes in the U1/U2 exit latencies in their SuperSpeed BOS
descriptor.  Don found that a Western Digital device he has experiences
transfer errors when LPM is enabled.  The lsusb shows the U1/U2 exit
latencies are set to zero:

Binary Object Store Descriptor:
  bLength                 5
  bDescriptorType        15
  wTotalLength           22
  bNumDeviceCaps          2
  SuperSpeed USB Device Capability:
    bLength                10
    bDescriptorType        16
    bDevCapabilityType      3
    bmAttributes         0x00
      Latency Tolerance Messages (LTM) Supported
    wSpeedsSupported   0x000e
      Device can operate at Full Speed (12Mbps)
      Device can operate at High Speed (480Mbps)
      Device can operate at SuperSpeed (5Gbps)
    bFunctionalitySupport   1
      Lowest fully-functional device speed is Full Speed (12Mbps)
    bU1DevExitLat           0 micro seconds
    bU2DevExitLat           0 micro seconds

The fix is to not enable LPM for a particular link state if we find its
corresponding exit latency is zero.

This patch should be backported to kernels as old as 3.5, that contain
the commit 1ea7e0e8e3 "USB: Add support to
enable/disable USB3 link states."

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: Don Zickus <dzickus@redhat.com>
Tested-by: Don Zickus <dzickus@redhat.com>
Cc: stable@vger.kernel.org
2012-10-08 11:48:07 -07:00
..
buffer.c USB: Core: Fix minor coding style issues 2011-01-22 19:35:39 -08:00
config.c usb: Fail a get config when the port is powered off. 2012-09-10 13:04:01 -07:00
devices.c USB: Fix race condition when removing host controllers 2012-09-26 10:21:08 -07:00
devio.c usbfs: Add a new disconnect-and-claim ioctl (v2) 2012-09-10 11:10:37 -07:00
driver.c USB: Enable LPM after a failed probe. 2012-10-08 11:47:40 -07:00
endpoint.c usb/endpoint: Set release callback in the struct device_type instead of in the device itself directly 2012-08-20 14:38:08 -07:00
file.c USB: rename the usb misc class from "usb" to "usbmisc" 2012-06-13 15:37:13 -07:00
generic.c USB: accept RNDIS configs if there's no alternative 2010-08-10 14:35:43 -07:00
hcd-pci.c USB: add NO_D3_DURING_SLEEP flag and revert 151b612847 2012-06-13 13:11:39 -07:00
hcd.c USB: Fix race condition when removing host controllers 2012-09-26 10:21:08 -07:00
hub.c usb: Don't enable LPM if the exit latency is zero. 2012-10-08 11:48:07 -07:00
Kconfig USB: remove CONFIG_EXPERIMENTAL dependancies 2012-09-17 23:00:15 -07:00
Makefile usb: Bind devices to ACPI devices when possible 2012-05-11 17:06:13 -07:00
message.c USB: core: remove unused dbg() call in message.c 2012-09-13 11:23:03 -07:00
notify.c usb: Add export.h for EXPORT_SYMBOL/THIS_MODULE where needed 2011-10-31 19:31:25 -04:00
otg_whitelist.h
quirks.c Merge 3.6-rc6 into usb-next 2012-09-16 20:42:46 -07:00
sysfs.c usb: convert USB_QUIRK_RESET_MORPHS to USB_QUIRK_RESET 2012-08-20 14:38:08 -07:00
urb.c usbhid: prevent deadlock during timeout 2012-05-01 13:22:13 -04:00
usb-acpi.c usb/acpi: Use ACPI methods to power off ports. 2012-09-10 13:04:01 -07:00
usb.c USB: Disable LPM while the device is unconfigured. 2012-07-11 07:06:46 -04:00
usb.h usb/acpi: Store info on device removability. 2012-09-10 13:04:01 -07:00