drm/i915/bxt: BLC implementation
Enabling BLC on BXT. Includes register definition, and new functions for BXT. In BXT, there are 2 sets of registers for BLC. Until there is clarity about which set would be effective, set 1 is being used. This would have to be re-visited if there is any change or when 2 LFPs are enabled on BXT. This patch enables brightness change which would be effected by use of hot-keys or sysfs entry. TODO:- BLC implementation will have to re-visited when 1. there is clarity about which set of registers has to be used and when. 2. CDCLK frequency is changed v2: Jani's review comments - Modified comment in i915_reg.h - Renamed register defintions - Removed definition of duty cycle max. Not required now and its not 64-bit. v3: - Rebase on top of VLV/CHV backlight changes, in particuliar bxt_set_backlight() now has a different prototype (Damien) Reviewed-by: NJani Nikula <jani.nikula@intel.com> Signed-off-by: NVandana Kannan <vandana.kannan@intel.com> Signed-off-by: NDamien Lespiau <damien.lespiau@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Shankar, Uma <uma.shankar@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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