tree 2f3e22b6fd5d0c1f1c3024613fd2ca9989e70d47
parent 5fe82c5ee1ba2d04183c376038c5d233a0311ec9
author Chris Wilson <chris@chris-wilson.co.uk> 1279296781 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1283937832 +0100

drm/i915/overlay: Workaround i830 overlay activation bug.

On i830, there exists a bug where an overlay on pipe B requires the mode
clock on pipe A in order to activate. So workaround this by activating
pipe A when trying to enable the overlay on pipe B.

References:

  [Bug 29007] GPU hang on video playback with overlay
  https://bugs.freedesktop.org/show_bug.cgi?id=29007

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>