drm/i915/skl: Updated the act_freq_mhz_show sysfs function

Added support for SKL in the act_freq_mhz_show sysfs function
Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_sysfs.c

@@ -319,7 +319,9 @@ static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 		ret = intel_gpu_freq(dev_priv, (freq >> 8) & 0xff);
 	} else {
 		u32 rpstat = I915_READ(GEN6_RPSTAT1);
-		if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
+		if (IS_GEN9(dev_priv))
+			ret = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
+		else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 			ret = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
 		else
 			ret = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;