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drm/i915/icl: Do not change reserved registers related to PSR2
For ICL the bit 12 of CHICKEN_TRANS is reserved so we should not touch it and as by default VSC_DATA_SEL_SOFTWARE_CONTROL is already unset in gen10 + GLK we can just drop it and fix for both gens. Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181204003403.23361-5-jose.souza@intel.com
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