[Intel-gfx] [PATCH 00/19] Haswell runtime PM support + D3

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

Hi

This series adds Haswell runtime PM support, which will put the graphics device
in D3 state, saving a lot of power. Fore more information, see the previous
cover letter:
  http://lists.freedesktop.org/archives/intel-gfx/2013-October/034910.html

What changes from the previous series?

Previously, the runtime PM test suite was separate from the PC8 test suite. Now,
pm_pc8.c is able to recognize both features, so we can run all tests on both
PC8-only or PC8+D3 cases. This code is all upstream. One of the consequences is
that some of the new D3 tests triggered bugs in cases where we only had PC8, so
patches 2, 3 and 4 solve these problems.

Patches 5-14 add the runtime PM support on Haswell. They are basically the same
thing as before, with a few new additions to catch the bugs I could reproduce
with the test suite. The other difference is that even though runtime PM is not
enabled by default, all you need to enable it is to "echo auto" to a sysfs file
(or just run powertop and switch things to "good"). No more Kernel parameter is
necessary. I could add it back if we want, no problem.

Patches 15-19 are not really part of the runtime PM feature, but they are on top
of that work, so I decided to send them anyway. While writing patch 9 I
identified some problems on the VDD code, so I decided to fix them on patches
15-19. The big benefit is that we avoid some msleep() calls with these patches,
so all eDP modesets get faster.

In short:
  - Patches 1-4: fixes for PC8 code
  - Patches 5-14: add the runtime PM support
  - Patches 15-19: some fixes for eDP VDD on top of everything

What are we still missing?

 - Merge PC8 and runtime D3: since PC8 without D3 doesn't make much sense, I
   plan to merge both features so they become a single thing. This will also
   make it easier for other platforms to add runtime PM support.
 - Support for PC8/D3 on DPMS. Jesse already started studying this problem, but
   there's a lot of rework we need to do on the modeset code before we reach
   this problem.
 - Support other platforms: adding support for another platform (e.g., VLV or
   IVB) will help us identify the code that needs to be shared and the code
   that's gen-specific.

Still, none of these missing things is a blocker: IMHO we can merge the Haswell
support now and worry about the other features later.

Thanks,
Paulo


Paulo Zanoni (19):
  drm/i915: WARN if !HAS_PC8 when enabling/disabling PC8
  drm/i915: use the correct force_wake function at the PC8 code
  drm/i915: get a PC8 reference when enabling the power well
  drm/i915: get/put PC8 when we get/put a CRTC
  drm/i915: add initial Runtime PM functions
  drm/i915: do adapter power state notification at runtime PM
  drm/i915: add runtime put/get calls at the basic places
  drm/i915: add some runtime PM get/put calls
  drm/i915: get a runtime PM reference when the panel VDD is on
  drm/i915: do not assert DE_PCH_EVENT_IVB enabled
  drm/i915: disable interrupts when enabling PC8
  drm/i915: release the GTT mmaps when going into D3
  drm: do not steal the display if we have a master
  drm/i915: add runtime PM support on Haswell
  drm/i915: don't enable VDD just to enable the panel
  drm/i915: don't touch the VDD when disabling the panel
  drm/i915: fix VDD override off wait
  drm/i915: save some time when waiting the eDP timings
  drm/i915: init the DP panel power seq regs earlier

 drivers/gpu/drm/drm_fb_helper.c            |  6 +++
 drivers/gpu/drm/i915/i915_debugfs.c        | 45 ++++++++++++++++--
 drivers/gpu/drm/i915/i915_dma.c            |  6 +++
 drivers/gpu/drm/i915/i915_drv.c            | 46 ++++++++++++++++++
 drivers/gpu/drm/i915/i915_drv.h            |  8 ++++
 drivers/gpu/drm/i915/i915_gem.c            | 61 ++++++++++++++++--------
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |  6 +++
 drivers/gpu/drm/i915/i915_irq.c            | 32 ++++++-------
 drivers/gpu/drm/i915/i915_sysfs.c          | 14 +++++-
 drivers/gpu/drm/i915/intel_ddi.c           |  3 --
 drivers/gpu/drm/i915/intel_display.c       | 41 +++++++++++++---
 drivers/gpu/drm/i915/intel_dp.c            | 75 +++++++++++++++++++++++-------
 drivers/gpu/drm/i915/intel_drv.h           |  7 +++
 drivers/gpu/drm/i915/intel_panel.c         |  3 ++
 drivers/gpu/drm/i915/intel_pm.c            | 70 +++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_uncore.c        | 13 ++++++
 16 files changed, 366 insertions(+), 70 deletions(-)

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1.8.3.1