drm/i915: get runtime PM at i915_reg_read_ioctl

To avoid WARNs when we call it.

Testcase: igt/pm_pc8/reg-read-ioctl
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75693
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index c47853bd60be..f729dc71d5be 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -866,7 +866,7 @@ int i915_reg_read_ioctl(struct drm_device *dev,
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_i915_reg_read *reg = data;
         struct register_whitelist const *entry = whitelist;
-        int i;
+        int i, ret = 0;
 
         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
                 if (entry->offset == reg->offset &&
@@ -877,6 +877,8 @@ int i915_reg_read_ioctl(struct drm_device *dev,
         if (i == ARRAY_SIZE(whitelist))
                 return -EINVAL;
 
+        intel_runtime_pm_get(dev_priv);
+
         switch (entry->size) {
         case 8:
                 reg->val = I915_READ64(reg->offset);
@@ -892,10 +894,13 @@ int i915_reg_read_ioctl(struct drm_device *dev,
                 break;
         default:
                 WARN_ON(1);
-                return -EINVAL;
+                ret = -EINVAL;
+                goto out;
         }
 
-        return 0;
+out:
+        intel_runtime_pm_put(dev_priv);
+        return ret;
 }
 
 int i915_get_reset_stats_ioctl(struct drm_device *dev,