From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 2 Jan 2018 15:12:31 +0000
Subject: drm/i915: Hold rpm wakeref for modifying the global seqno
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Git-commit: 65c475c6dd607226159a774d7c3d7ff4b6e00255
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

To modify the global seqno may require rewriting a few registers, which
requires us to hold the rpm wakeref. We must therefore take it around
the call to i915_gem_set_global_seqno() in debugfs, on behalf of the
user.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180102151235.3949-15-chris@chris-wilson.co.uk

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -987,7 +987,10 @@ i915_next_seqno_set(void *data, u64 val)
 	if (ret)
 		return ret;
 
+	intel_runtime_pm_get(dev_priv);
 	ret = i915_gem_set_global_seqno(dev, val);
+	intel_runtime_pm_put(dev_priv);
+
 	mutex_unlock(&dev->struct_mutex);
 
 	return ret;