drm/i915: Finish enabling rps before use by sysfs or debugfs

Enabling rps (turbo setup) was put in a work queue because it may
take quite awhile.  This change flushes the work queue to initialize
rps values before use by sysfs or debugfs.  Specifically,
rps.delayed_resume_work is flushed before using rps.hw_max,
rps.max_delay, rps.min_delay, or rps.cur_delay.

This change fixes a problem in sysfs where show functions using
uninitialized values show incorrect values and store functions
using uninitialized values in range checks incorrectly fail to
store valid input values.  This change also addresses similar use
before initialized problems in debugfs.

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 8003886361b8..9ff1e4d96909 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -251,6 +251,8 @@ static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
         struct drm_i915_private *dev_priv = dev->dev_private;
         int ret;
 
+        flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
         mutex_lock(&dev_priv->rps.hw_lock);
         if (IS_VALLEYVIEW(dev_priv->dev)) {
                 u32 freq;
@@ -283,6 +285,8 @@ static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute
         struct drm_i915_private *dev_priv = dev->dev_private;
         int ret;
 
+        flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
         mutex_lock(&dev_priv->rps.hw_lock);
         if (IS_VALLEYVIEW(dev_priv->dev))
                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.max_delay);
@@ -307,6 +311,8 @@ static ssize_t gt_max_freq_mhz_store(struct device *kdev,
         if (ret)
                 return ret;
 
+        flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
         mutex_lock(&dev_priv->rps.hw_lock);
 
         if (IS_VALLEYVIEW(dev_priv->dev)) {
@@ -355,6 +361,8 @@ static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute
         struct drm_i915_private *dev_priv = dev->dev_private;
         int ret;
 
+        flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
         mutex_lock(&dev_priv->rps.hw_lock);
         if (IS_VALLEYVIEW(dev_priv->dev))
                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.min_delay);
@@ -379,6 +387,8 @@ static ssize_t gt_min_freq_mhz_store(struct device *kdev,
         if (ret)
                 return ret;
 
+        flush_delayed_work(&dev_priv->rps.delayed_resume_work);
+
         mutex_lock(&dev_priv->rps.hw_lock);
 
         if (IS_VALLEYVIEW(dev)) {