drm/i915: Remove 10% cdclk guardband on BXT

We don't need any pixel clock vs. cdclk guardband since HSW. BXT still
tries to add one though. Get rid of it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1462995892-32416-8-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d837bc4..fcfd68b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5901,16 +5901,15 @@ static int broxton_calc_cdclk(int max_pixclk)
 {
        /*
         * FIXME:
-        * - remove the guardband, it's not needed on BXT
         * - set 19.2MHz bypass frequency if there are no active pipes
         */
-       if (max_pixclk > 576000*9/10)
+       if (max_pixclk > 576000)
                return 624000;
-       else if (max_pixclk > 384000*9/10)
+       else if (max_pixclk > 384000)
                return 576000;
-       else if (max_pixclk > 288000*9/10)
+       else if (max_pixclk > 288000)
                return 384000;
-       else if (max_pixclk > 144000*9/10)
+       else if (max_pixclk > 144000)
                return 288000;
        else
                return 144000;