• Ben Widawsky's avatar
    drm/i915: Better overclock support · 31c77388
    Ben Widawsky authored
    Most importantly this will allow users to set overclock frequencies in
    sysfs. Previously the max was limited by the RP0 max as opposed to the
    overclock max. This is useful if one wants to either limit the max
    overclock frequency, or set the minimum frequency to be in the overclock
    range. It also fixes an issue where if one sets the max frequency to be
    below the overclock max, they wouldn't be able to set back the proper
    overclock max.
    
    In addition I've added a couple of other bits:
    Show the overclock freq. as max in sysfs
    Print the overclock max in debugfs.
    Print a warning if the user sets the min frequency to be in the
    overclock range.
    
    In this patch I've decided to store the hw_max when we read it from the
    pcode at init. The reason I do this is the pcode reads can fail, and are
    slow.
    
    v2: Report when user requested overclocked max (Daniel)
    Remove when user sets min to overclock range (Daniel)
    
    Reported-by: freezer from #intel-gfx on irc
    Signed-off-by: default avatarBen Widawsky <ben@bwidawsk.net>
    Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
    [danvet: Fixup the s/100MHz/50MHz/ confusion in an unrelated comment
    that Mika spotted.]
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    31c77388
i915_drv.h 59.3 KB