[Bug 89346] New: Watermarks need to be recomputed on cursor size change

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89346

            Bug ID: 89346
           Summary: Watermarks need to be recomputed on cursor size change
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: joe.konno at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

As of "drm/i915: Refactor work that can sleep out of commit (v7)", commit hash
listed below, there is a lot of display flicker seen when cursor sizes change
on gen8.

The original fix was made here and is present in recent Chromium OS kernels:

  commit 64f962e3e38bf6f40bbd2462f8380dee0369e1bf
  Author: Chris Wilson <chris at chris-wilson.co.uk>
  Date:   Wed Mar 26 12:38:15 2014 +0000

      drm/i915: Recompute WM when the cursor size changes

However, the recompute logic apparently got lost in refactoring, on around this
point:

  commit 32b7eeec4d1e861230b09d437e95d76c86ff4a68
  Author: Matt Roper <matthew.d.roper at intel.com>
  Date:   Wed Dec 24 07:59:06 2014 -0800

      drm/i915: Refactor work that can sleep out of commit (v7)

Let's add the relevant code back. I'm rounding some edges on a patch, to land
on the mailing list soon.

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