[Intel-gfx] [PATCH] drm/i915: Don't display nonsensical values in i915_ddb_info on gen < 9

[Damien Lespiau]

When playing around with debugfs and a HSW machine I noticed that we
were displaying some garbled value in i915_ddb_info. This debugfs file
is only meaningful for gen9+, so don't display anything on earlier
platforms.

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 6c16939..d0e445e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2743,6 +2743,9 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
 	enum pipe pipe;
 	int plane;
 
+	if (INTEL_INFO(dev)->gen < 9)
+		return 0;
+
 	drm_modeset_lock_all(dev);
 
 	ddb = &dev_priv->wm.skl_hw.ddb;
-- 
1.8.3.1