drm/i915: Do not enable DRRS when PSR is enabled
Some platforms do not support PSR and DRRS simultaneously. Visual artifacts and flickering were reported on BDW HP Spectre x360 Convertible. Deferring to PSR when both PSR and DRRS are supported by the panel. V2: Minor code-style changes suggested by Rodrigo V3: Add a WARN_ON during PSR init suggested by Dhinakaran Correct debug message,title suggested by Jani Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101111 Cc: Nicholas Stommel <nicholas.stommel@gmail.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Clinton Taylor <clinton.a.taylor@intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170914181641.24393-1-radhakrishna.sripada@intel.com
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