[Feature] Haswell ULT - SATA DEVSLP (aka LPM) host side enabling

[Yingying Zhao]

A new host-controlled SATA interface power state, DevSleep, and a new host-controlled HW signal, DEVSLP, which together enable a SATA host and device to enter an ultra-low interface power state, including the possibility of completely powering down host and device PHYs.
The DevSleep interface power state and DEVSLP signal are enabled/disabled by a new SATA feature, Device Sleep, controlled by the SET FEATURES command.

External links:
http://www.sata-io.org/documents/SATA-DevSleep-and-RTD3-WP.pdf

Upstream Schedule:
ww50'12

[Anthony Wong (anthonywong)]

@yingying
Do you have any updates about this feature?

[Yingying Zhao (yingying-zhao)]

The code is already in kernel 3.7.
But currently, the verification on Intel platforms are blocked due to some hardware device issue.

[XiongZhang (xiong-y-zhang)]

1. To support this feature, following patch need to be backported to raring kernel:

commit 8e725c7f8a60feaa88edacd4dee2c754d5ae7706
Author: David Woodhouse <email address hidden>
Date: Fri Mar 29 11:54:55 2013 +0000

 libata: fix DMA to stack in reading devslp_timing parameters

2. To enable hdparm userland tool to report device DevSleep capability, one patch for hdparm :

https://sourceforge.net/tracker/?func=detail&atid=736684&aid=3610002&group_id=136732

3. To verify this feature, the SATA device should support DEVSLP

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.8.0-18.28

---------------
linux (3.8.0-18.28) raring; urgency=low

  [ Andy Whitcroft ]

  * (debian) fix internal linkage for separated header packages
    - LP: #1165259

  [ Gavin Guo ]

  * SAUCE: Bluetooth: Add support for Broadcom 413c:8143
    - LP: #1166113

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: Fix quieting of audit messages for network
    mediation
    - LP: #1163259

  [ Kamal Mostafa ]

  * SAUCE: (no-up) drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13
    backlight
    - LP: #1162026, #1163720

  [ Leann Ogasawara ]

  * [Config] Disable CONFIG_PARPORT_PC_FIFO
    - LP: #339752

  [ Martin Pitt ]

  * SAUCE: (no-up) mac80211_hwsim: Register and bind to driver
    - LP: #1166250

  [ Paolo Pisati ]

  * [Config] RTC_DRV_PL031=y

  [ Stefan Bader ]

  * (debian) Abort build on unresolved symbols
    - LP: #1166197

  [ Tim Gardner ]

  * [Config] Add libceph to inclusion list
  * [Config] Drop all inclusion list modules with unsatisfied dependencies
  * SAUCE: (no-up) Remove emi62 files duplicated in linux-firmware
  * SAUCE: (no-up) Remove emi26 files duplicated in linux-firmware
  * SAUCE: (no-up) Remove whiteheat files duplicated in linux-firmware
  * Release Tracking Bug
    - LP: #1168040

  [ Upstream Kernel Changes ]

  * TTY: do not update atime/mtime on read/write
    - LP: #1097680
    - CVE-2013-0160
  * KVM: x86: Convert MSR_KVM_SYSTEM_TIME to use gfn_to_hva_cache functions
    (CVE-2013-1797)
    - LP: #1158258
    - CVE-2013-1797
  * KVM: Fix bounds checking in ioapic indirect register reads
    (CVE-2013-1798)
    - LP: #1158262
    - CVE-2013-1798
  * drm/i915: HDMI/DP - ELD info refresh support for Haswell
    - LP: #1011438
  * ALSA - HDA: New PCI ID for Haswell ULT
    - LP: #1011438
  * ALSA: hda - Support rereading widgets under the function group
    - LP: #1011438
  * ALSA: hda - Add fixup for Haswell to enable all pin and convertor
    widgets
    - LP: #1011438
  * libata: fix DMA to stack in reading devslp_timing parameters
    - LP: #1031173
  * dmaengine: dw_dmac: remove CLK dependency
    - LP: #1031163
  * dmaengine: dw_dmac: Enhance device tree support
    - LP: #1031163
  * dmaengine: dw_dmac: amend description and indentation
    - LP: #1031163
  * dw_dmac: change dev_printk() to corresponding macros
    - LP: #1031163
  * dw_dmac: don't call platform_get_drvdata twice
    - LP: #1031163
  * dw_dmac: change dev_crit to dev_WARN in dwc_handle_error
    - LP: #1031163
  * dw_dmac: introduce to_dw_desc() macro
    - LP: #1031163
  * dw_dmac: absence of pdata isn't critical when autocfg is set
    - LP: #1031163
  * dw_dmac: check for mapping errors
    - LP: #1031163
  * dw_dmac: remove redundant check
    - LP: #1031163
  * dw_dmac: update tx_node_active in dwc_do_single_block
    - LP: #1031163
  * dma: dw_dmac: add dwc_chan_pause and dwc_chan_resume
    - LP: #1031163
  * dmaengine: introduce is_slave_direction function
    - LP: #1031163
  * dmaengine: add possibility for cyclic transfers
    - LP: #1031163
  * dma: dw_dmac: check direction properly in dw_dma_cyclic_prep
    - LP: #1031163
  * dma: ep93xx_dma: reuse is_slave_direction helpe...

[Leann Ogasawara (leannogasawara)]

Per feedback from Intel, retarget hdparm request to Saucy.

[Launchpad Janitor (janitor)]

This bug was fixed in the package hdparm - 9.43-1ubuntu2

---------------
hdparm (9.43-1ubuntu2) saucy; urgency=low

  * hdparm.c, identify.c, sgio.h: import patch from
    http://sourceforge.net/p/hdparm/patches/35/ to add support to 'hdparm -I'
    for reporting DevSleep information. LP: #1031173.
 -- Steve Langasek <email address hidden> Tue, 30 Apr 2013 08:58:10 -0700

[Adam Conrad (adconrad)]

The verification of this Stable Release Update has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regresssions.