drm/i915/dp: manage sink power state if possible
On sinks with a DPCD rev of 1.1 or greater, we can send sink power management commands to address 0x600 per section 5.1.5 of the DisplayPort 1.1a spec. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: NKeith Packard <keithp@keithp.com> Signed-off-by: NKeith Packard <keithp@keithp.com>
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