[Bug 89055] [SKL ] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89055

Matt Roper <matthew.d.roper at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |BXT
                 CC|                            |matthew.d.roper at intel.com
           Assignee|gabriel.feceoru at intel.com   |matthew.d.roper at intel.com

--- Comment #33 from Matt Roper <matthew.d.roper at intel.com> ---
I'm pretty sure this happens because we wind up re-computing the same watermark
values for each CRTC multiple times in a single atomic transaction (once per
CRTC involved in the transaction).  I'm putting together some patches that make
SKL watermarks play more nicely with atomic (and eliminate this unnecessary
looping); I should have those ready to post next week sometime.

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