drm/i915: Skip modifying PCH DREF if not changing clock sources

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Modifying the clock sources (via the DREF control on the PCH) is a slow
multi-stage process as we need to let the clocks stabilise between each
stage. If we are not actually changing the clock sources, then we can
return early.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Appease checkpatch by deleting a space after a ~]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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Chris Wilson 2013-03-26 16:33:04 -07:00 • committed by Daniel Vetter

parent 31ad8ec6a6

commit 74cfd7ac5e

1 changed files with 61 additions and 22 deletions

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85

drivers/gpu/drm/i915/intel_display.c

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