drm/i915: Only look for matching clocks for LVDS downclock
This patch enforces that the downclock clock source is the same as the preferred clock source for LVDS. This fixes a bug where the driver chooses a downclock clock source with a different P than the preferred mode clock source. This happened even if the preferred clock source implemented an acceptable rate for the downclock. The result of this bug is that downclock is disabled. Signed-off-by: Sean Paul <seanpaul@chromium.org> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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