drm/i915: Remove unwarranted clamping for hsw/bdw

We always start off at an "efficient frequency" and can let the system
autotune from there, eliminating the need to clamp the available range.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190418205358.11450-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_pm.c

@@ -8528,18 +8528,9 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 		gen6_init_rps_frequencies(dev_priv);
 
 	/* Derive initial user preferences/limits from the hardware limits */
-	rps->idle_freq = rps->min_freq;
-	rps->cur_freq = rps->idle_freq;
-
 	rps->max_freq_softlimit = rps->max_freq;
 	rps->min_freq_softlimit = rps->min_freq;
 
-	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
-		rps->min_freq_softlimit =
-			max_t(int,
-			      rps->efficient_freq,
-			      intel_freq_opcode(dev_priv, 450));
-
 	/* After setting max-softlimit, find the overclock max freq */
 	if (IS_GEN(dev_priv, 6) ||
 	    IS_IVYBRIDGE(dev_priv) || IS_HASWELL(dev_priv)) {
@@ -8556,6 +8547,8 @@ void intel_init_gt_powersave(struct drm_i915_private *dev_priv)
 
 	/* Finally allow us to boost to max by default */
 	rps->boost_freq = rps->max_freq;
+	rps->idle_freq = rps->min_freq;
+	rps->cur_freq = rps->idle_freq;
 
 	mutex_unlock(&dev_priv->pcu_lock);
 }