1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5363e9c66c27..4fa00fcfbc96 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1765,6 +1765,64 @@ static const struct file_operations i915_max_freq_fops = {
 };
 
 static ssize_t
+i915_min_freq_read(struct file *filp, char __user *ubuf, size_t max,
+                   loff_t *ppos)
+{
+        struct drm_device *dev = filp->private_data;
+        drm_i915_private_t *dev_priv = dev->dev_private;
+        char buf[80];
+        int len;
+
+        len = snprintf(buf, sizeof(buf),
+                       "min freq: %d\n", dev_priv->min_delay * 50);
+
+        if (len > sizeof(buf))
+                len = sizeof(buf);
+
+        return simple_read_from_buffer(ubuf, max, ppos, buf, len);
+}
+
+static ssize_t
+i915_min_freq_write(struct file *filp, const char __user *ubuf, size_t cnt,
+                    loff_t *ppos)
+{
+        struct drm_device *dev = filp->private_data;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        char buf[20];
+        int val = 1;
+
+        if (cnt > 0) {
+                if (cnt > sizeof(buf) - 1)
+                        return -EINVAL;
+
+                if (copy_from_user(buf, ubuf, cnt))
+                        return -EFAULT;
+                buf[cnt] = 0;
+
+                val = simple_strtoul(buf, NULL, 0);
+        }
+
+        DRM_DEBUG_DRIVER("Manually setting min freq to %d\n", val);
+
+        /*
+         * Turbo will still be enabled, but won't go below the set value.
+         */
+        dev_priv->min_delay = val / 50;
+
+        gen6_set_rps(dev, val / 50);
+
+        return cnt;
+}
+
+static const struct file_operations i915_min_freq_fops = {
+        .owner = THIS_MODULE,
+        .open = simple_open,
+        .read = i915_min_freq_read,
+        .write = i915_min_freq_write,
+        .llseek = default_llseek,
+};
+
+static ssize_t
 i915_cache_sharing_read(struct file *filp,
                    char __user *ubuf,
                    size_t max,
@@ -1997,6 +2055,12 @@ int i915_debugfs_init(struct drm_minor *minor)
                 return ret;
 
         ret = i915_debugfs_create(minor->debugfs_root, minor,
+                                  "i915_min_freq",
+                                  &i915_min_freq_fops);
+        if (ret)
+                return ret;
+
+        ret = i915_debugfs_create(minor->debugfs_root, minor,
                                   "i915_cache_sharing",
                                   &i915_cache_sharing_fops);
         if (ret)
@@ -2028,6 +2092,8 @@ void i915_debugfs_cleanup(struct drm_minor *minor)
                                  1, minor);
         drm_debugfs_remove_files((struct drm_info_list *) &i915_max_freq_fops,
                                  1, minor);
+        drm_debugfs_remove_files((struct drm_info_list *) &i915_min_freq_fops,
+                                 1, minor);
         drm_debugfs_remove_files((struct drm_info_list *) &i915_cache_sharing_fops,
                                  1, minor);
         drm_debugfs_remove_files((struct drm_info_list *) &i915_ring_stop_fops,