• Ville Syrjälä's avatar
    drm/i915: Add "Automatic" mode for the "Broadcast RGB" property · 55bc60db
    Ville Syrjälä authored
    Add a new "Automatic" mode to the "Broadcast RGB" range property.
    When selected the driver automagically selects between full range and
    limited range output.
    
    Based on CEA-861 [1] guidelines, limited range output is selected if the
    mode is a CEA mode, except 640x480. Otherwise full range output is used.
    Additionally DVI monitors should most likely default to full range
    always.
    
    As per DP1.2a [2] DisplayPort should always use full range for 18bpp, and
    otherwise will follow CEA-861 rules.
    
    NOTE: The default value for the property will now be "Automatic"
    so some people may be affected in case they're relying on the
    current full range default.
    
    [1] CEA-861-E - 5.1 Default Encoding Parameters
    [2] VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
    
    v2: Use has_hdmi_sink to check if a HDMI monitor is present
    v3: Add information about relevant spec chapters
    Reviewed-by: default avatarPaulo Zanoni <paulo.r.zanoni@intel.com>
    Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    55bc60db
intel_dp.c 81.2 KB