drm/i915: get/put runtime PM at i915_semaphore_status

Otherwise we will print some WARNs when we read registers and the
machine is suspended.

Testcase: igt/pm_rpm/debugfs-read
Cc: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 3945191..952f199 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2314,6 +2314,7 @@ static int i915_semaphore_status(struct seq_file *m, void *unused)
        ret = mutex_lock_interruptible(&dev->struct_mutex);
        if (ret)
                return ret;
+       intel_runtime_pm_get(dev_priv);
 
        if (IS_BROADWELL(dev)) {
                struct page *page;
@@ -2363,6 +2364,7 @@ static int i915_semaphore_status(struct seq_file *m, void *unused)
        }
        seq_putc(m, '\n');
 
+       intel_runtime_pm_put(dev_priv);
        mutex_unlock(&dev->struct_mutex);
        return 0;
 }