[Intel-gfx] [PATCH 00/12] drm/i915: add missing display power refs

[Imre Deak]

This patchset adds missing display power domain references during
modeset HW readout, which I noticed via wakeref warnings the
corresponding HW accesses triggered. The crt and ddi patches have a
concrete bugzilla reference they fix, I don't know of reports that would
be fixed by the rest of the patches in the set. On the way I also
noticed other places which are potentially racy (debugfs CRC, VGA
 disabling, pipe_assert) so I fixed those up too.

I left the IRQ setup and error capture code as-is: the former happens
during driver loading and resume, so the power is guaranteed to stay on
for the whole sequence. For error capture, we decided early on that we
won't add any locking around these accesses to minimize the chance for
locking inversions. Also for this we would need to grab a mutex which
isn't possible on the error capture path.

Mika came up with a very similar fix, since he suspects that it could
also be related to recent DMC problems. We agreed that I send mine since
it uses the more optimal rpm_get_if_in_use() helper (and looks more
polished).

Imre Deak (12):
  drm/i915: add helper to get a display power ref if it was already
    enabled
  drm/i915: ensure the HW is powered during display pipe HW readout
  drm/i915/ibx: ensure the HW is powered during PLL HW readout
  drm/i915: ensure the HW is powered when disabling VGA
  drm/i915: ensure the HW is powered during HW access in assert_pipe
  drm/i915/crt: ensure the HW is powered during HW state readout
  drm/i915/ddi: ensure the HW is powered during HW state readout
  drm/i915: ensure the HW is powered when accessing the CRC HW block
  drm/i915/dp: ensure the HW is powered during HW state readout
  drm/i915/dsi: ensure the HW is powered during HW state readout
  drm/i915/hdmi: ensure the HW is powered during HW state readout
  drm/i915/lvds: ensure the HW is powered during HW state readout

 drivers/gpu/drm/i915/i915_debugfs.c     |  28 ++++++--
 drivers/gpu/drm/i915/intel_crt.c        |  13 +++-
 drivers/gpu/drm/i915/intel_ddi.c        | 116 ++++++++++++++++++++++----------
 drivers/gpu/drm/i915/intel_display.c    |  86 ++++++++++++++++-------
 drivers/gpu/drm/i915/intel_dp.c         |  18 +++--
 drivers/gpu/drm/i915/intel_drv.h        |   3 +
 drivers/gpu/drm/i915/intel_dsi.c        |  13 +++-
 drivers/gpu/drm/i915/intel_hdmi.c       |  14 +++-
 drivers/gpu/drm/i915/intel_lvds.c       |  14 +++-
 drivers/gpu/drm/i915/intel_runtime_pm.c | 111 +++++++++++++++++++++++++-----
 10 files changed, 315 insertions(+), 101 deletions(-)

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2.5.0