drm/i915: Remove obsolete min/max freq setters from debugfs

A more complete, and more importantly stable, interface for controlling
the RPS frequency range is available in sysfs, obsoleting the unstable
debugfs.

It's presence seems to trick people into using it, forgetting it is not
ABI.

References: https://bugs.freedesktop.org/show_bug.cgi?id=106237
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/20180425142334.27113-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_debugfs.c

@@ -4204,119 +4204,6 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_drop_caches_fops,
 			i915_drop_caches_get, i915_drop_caches_set,
 			"0x%08llx\n");
 
-static int
-i915_max_freq_get(void *data, u64 *val)
-{
-	struct drm_i915_private *dev_priv = data;
-
-	if (INTEL_GEN(dev_priv) < 6)
-		return -ENODEV;
-
-	*val = intel_gpu_freq(dev_priv, dev_priv->gt_pm.rps.max_freq_softlimit);
-	return 0;
-}
-
-static int
-i915_max_freq_set(void *data, u64 val)
-{
-	struct drm_i915_private *dev_priv = data;
-	struct intel_rps *rps = &dev_priv->gt_pm.rps;
-	u32 hw_max, hw_min;
-	int ret;
-
-	if (INTEL_GEN(dev_priv) < 6)
-		return -ENODEV;
-
-	DRM_DEBUG_DRIVER("Manually setting max freq to %llu\n", val);
-
-	ret = mutex_lock_interruptible(&dev_priv->pcu_lock);
-	if (ret)
-		return ret;
-
-	/*
-	 * Turbo will still be enabled, but won't go above the set value.
-	 */
-	val = intel_freq_opcode(dev_priv, val);
-
-	hw_max = rps->max_freq;
-	hw_min = rps->min_freq;
-
-	if (val < hw_min || val > hw_max || val < rps->min_freq_softlimit) {
-		mutex_unlock(&dev_priv->pcu_lock);
-		return -EINVAL;
-	}
-
-	rps->max_freq_softlimit = val;
-
-	if (intel_set_rps(dev_priv, val))
-		DRM_DEBUG_DRIVER("failed to update RPS to new softlimit\n");
-
-	mutex_unlock(&dev_priv->pcu_lock);
-
-	return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(i915_max_freq_fops,
-			i915_max_freq_get, i915_max_freq_set,
-			"%llu\n");
-
-static int
-i915_min_freq_get(void *data, u64 *val)
-{
-	struct drm_i915_private *dev_priv = data;
-
-	if (INTEL_GEN(dev_priv) < 6)
-		return -ENODEV;
-
-	*val = intel_gpu_freq(dev_priv, dev_priv->gt_pm.rps.min_freq_softlimit);
-	return 0;
-}
-
-static int
-i915_min_freq_set(void *data, u64 val)
-{
-	struct drm_i915_private *dev_priv = data;
-	struct intel_rps *rps = &dev_priv->gt_pm.rps;
-	u32 hw_max, hw_min;
-	int ret;
-
-	if (INTEL_GEN(dev_priv) < 6)
-		return -ENODEV;
-
-	DRM_DEBUG_DRIVER("Manually setting min freq to %llu\n", val);
-
-	ret = mutex_lock_interruptible(&dev_priv->pcu_lock);
-	if (ret)
-		return ret;
-
-	/*
-	 * Turbo will still be enabled, but won't go below the set value.
-	 */
-	val = intel_freq_opcode(dev_priv, val);
-
-	hw_max = rps->max_freq;
-	hw_min = rps->min_freq;
-
-	if (val < hw_min ||
-	    val > hw_max || val > rps->max_freq_softlimit) {
-		mutex_unlock(&dev_priv->pcu_lock);
-		return -EINVAL;
-	}
-
-	rps->min_freq_softlimit = val;
-
-	if (intel_set_rps(dev_priv, val))
-		DRM_DEBUG_DRIVER("failed to update RPS to new softlimit\n");
-
-	mutex_unlock(&dev_priv->pcu_lock);
-
-	return 0;
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(i915_min_freq_fops,
-			i915_min_freq_get, i915_min_freq_set,
-			"%llu\n");
-
 static int
 i915_cache_sharing_get(void *data, u64 *val)
 {
@@ -4878,8 +4765,6 @@ static const struct i915_debugfs_files {
 	const struct file_operations *fops;
 } i915_debugfs_files[] = {
 	{"i915_wedged", &i915_wedged_fops},
-	{"i915_max_freq", &i915_max_freq_fops},
-	{"i915_min_freq", &i915_min_freq_fops},
 	{"i915_cache_sharing", &i915_cache_sharing_fops},
 	{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
 	{"i915_ring_test_irq", &i915_ring_test_irq_fops},