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[Launchpad Bug Tracker <1359507@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.16.0-16.22

---------------
linux (3.16.0-16.22) utopic; urgency=low

  [ Andy Whitcroft ]

  * Revert "SAUCE: x86/xen: Fix setup of 64bit kernel pagetables"
  * [Config] tools -- only build common tools when enabled
  * [Config] follow rename of DEB_BUILD_PROFILES

  [ Tim Gardner ]

  * [Debian] set do_*_tools after stage1 or bootstrap is determined
    - LP: #1370211
  * Release Tracking Bug
    - LP: #1370535

  [ Upstream Kernel Changes ]

  * x86/xen: don't copy bogus duplicate entries into kernel page tables
  * blk-merge: fix blk_recount_segments
    - LP: #1359146
  * igb: bring link up when PHY is powered up
    - LP: #1370018
  * igb: remove unnecessary break after goto
    - LP: #1370018
  * igb: remove unnecessary break after return
    - LP: #1370018
  * igb: Add message when malformed packets detected by hw
    - LP: #1370018
  * igb: bump igb version to 5.2.13
    - LP: #1370018
 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>   Tue, 16 Sep 2014 10:19:04 -0600

** Changed in: linux (Ubuntu Utopic)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1359507

Title:
  ahci_xgene: Fix the link down in first attempt for the APM X-Gene SoC
  AHCI SATA host controller driver

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  [IMPACT]
  The link down issue in first attempt happens due to 2 H/W errata below:

  1. Due to HW errata, during speed negotiation, sometimes controller
  is not able to detect ALIGN at GEN3(6Gbps) within 54.6us results in
  a timeout. This issue can be recovered by issuing a COMRESET again.

  2. Due to HW errata, although ALIGH detection is successfull, due to
  8b/10b and disparity BERR, sometimes the signature from the drive is
  not received successfully by the Host controller. Due to this the
  communication with the host and drive is not established due to
  locking of CDR(clock and data recovery) circuit. This issue can be
  recovered by issuing a COMRESET again.

  This patch fixes the above issues by retrying the COMRESET with a
  maximum attempts of 3.

  [TEST CASE]
  Repeatedly reboot the system.

  [Regression Potential]
  Fix specific to the xgene ahci driver hardreset function.

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