[Intel-gfx] [PATCH 0/4] Wrap up ILK-style atomic watermarks, try two

[Matt Roper]

Patches #3 and #4 here are the final two patches from the atomic watermark
series that was posted here:

   http://lists.freedesktop.org/archives/intel-gfx/2015-September/076634.html

We had to pull those out when Jani reported a BDW boot regression (divide by
zero during watermark calculation).  Although we never found a smoking gun for
that divide by zero, I haven't been able to reproduce the issue on a similar
system.  There's been a lot of code churn since that time, so I'm hoping that
we've either already fixed the issue without realizing it, or that the extra
paranoia added in patch #2 here will avoid the crash and highlight the culprit.

The first patch here solves a legitimate bug that could cause a divide-by-zero
(just not the one Jani was seeing).  The second patch adds extra guards on
divide operations to verify our invariants and ensure that bugs elsewhere in
the driver can't lead to a fatal divide-by-zero (at least on the ILK
codepaths).

Please don't merge #3 or #4 here until we at least get a positive test result
from Jani.


Matt Roper (4):
  drm/i915: Convert hsw_compute_linetime_wm to use in-flight state
  drm/i915: Add extra paranoia to ILK watermark calculations
  drm/i915: Sanitize watermarks after hardware state readout
  drm/i915: Add two-stage ILK-style watermark programming (v6)

 drivers/gpu/drm/i915/i915_drv.h      |   5 +
 drivers/gpu/drm/i915/intel_atomic.c  |   1 +
 drivers/gpu/drm/i915/intel_display.c | 137 +++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_drv.h     |  31 +++++-
 drivers/gpu/drm/i915/intel_pm.c      | 186 +++++++++++++++++++++++++----------
 5 files changed, 305 insertions(+), 55 deletions(-)

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2.1.4