• Vandana Kannan's avatar
    drm/i915/bxt: BLC implementation · 0fb890c0
    Vandana Kannan authored
    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: default avatarJani Nikula <jani.nikula@intel.com>
    Signed-off-by: default avatarVandana Kannan <vandana.kannan@intel.com>
    Signed-off-by: default avatarDamien Lespiau <damien.lespiau@intel.com>
    Cc: Jani Nikula <jani.nikula@linux.intel.com>
    Cc: Shankar, Uma <uma.shankar@intel.com>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    0fb890c0
i915_reg.h 292 KB