• Ville Syrjälä's avatar
    drm: Perform basic sanity checks on probed modes · abc0b144
    Ville Syrjälä authored
    Make sure the timings of probed modes at least pass some very basic
    sanity checks.
    
    The checks include:
     - clock,hdisplay,vdisplay are non zero
     - sync pulse fits within the blanking period
     - htotal,vtotal are big enough
    
    I have not checked all the drivers to see if the modes the generate
    might violate these constraints. I'm hoping not, because that would mean
    either abandoning the idea of doing this from the core code, or fixing
    the drivers.
    
    I'm not entirely sure about limiting the sync pulse to the blanking
    period. Intel hardware doesn't support such things, but some other
    hardware might. However at least HDMI doesn't allow having sync pulse
    edges within the active period, so I'm thinking the check is probably
    OK to have in the common code.
    Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
    Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    abc0b144
drm_probe_helper.c 15 KB