drm/i915/glk: Remove 99% limitation.

While checking the opportunity to add a display_gen
check to allow glk and cnl to be on same bucket I noticed
these FIXME cases here.

So I got the confirmation from HW architect that we actually
never needed this workaround.

"GLK supports 2 pixel per clock, so pixel clock can be up to 2 * cdclk."

So, this reverts commit 97f55ca5b662 ("drm/i915/glk: limit pixel
 clock to 99% of cdclk workaround")

Fixes: 97f55ca5b662 ("drm/i915/glk: limit pixel clock to 99% of cdclk workaround")

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Madhav Chauhan <madhav.chauhan@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Clinton Taylor <clinton.a.taylor@intel.com>
Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181026005636.22274-1-rodrigo.vivi@intel.com
(cherry picked from commit 42882336e62aab00278114392a16374f272a0c99)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/intel_cdclk.c

@@ -2138,16 +2138,8 @@ void intel_set_cdclk(struct drm_i915_private *dev_priv,
 static int intel_pixel_rate_to_cdclk(struct drm_i915_private *dev_priv,
 				     int pixel_rate)
 {
-	if (INTEL_GEN(dev_priv) >= 10)
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
 		return DIV_ROUND_UP(pixel_rate, 2);
-	else if (IS_GEMINILAKE(dev_priv))
-		/*
-		 * FIXME: Avoid using a pixel clock that is more than 99% of the cdclk
-		 * as a temporary workaround. Use a higher cdclk instead. (Note that
-		 * intel_compute_max_dotclk() limits the max pixel clock to 99% of max
-		 * cdclk.)
-		 */
-		return DIV_ROUND_UP(pixel_rate * 100, 2 * 99);
 	else if (IS_GEN9(dev_priv) ||
 		 IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
 		return pixel_rate;
@@ -2543,14 +2535,8 @@ static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
 {
 	int max_cdclk_freq = dev_priv->max_cdclk_freq;
 
-	if (INTEL_GEN(dev_priv) >= 10)
+	if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
 		return 2 * max_cdclk_freq;
-	else if (IS_GEMINILAKE(dev_priv))
-		/*
-		 * FIXME: Limiting to 99% as a temporary workaround. See
-		 * intel_min_cdclk() for details.
-		 */
-		return 2 * max_cdclk_freq * 99 / 100;
 	else if (IS_GEN9(dev_priv) ||
 		 IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
 		return max_cdclk_freq;