[Intel-gfx] [PATCH] drm/i915: Limit the auto arming of mmio debugs on vlv/chv

Mika Kuoppala mika.kuoppala at linux.intel.com
Wed Jan 20 02:32:23 PST 2016

The capability to detect unclaimed register access was
recently introduced for vlv/chv platforms. Apparently
there are plenty of unclaimed access on these platforms,
resulting in new dmesg warns. But as we are trying to form
a beachhead for CI/Bat, all new warns are adding to the
noise and thus not desirable at this point in time.

Make it so that if in these platforms the automatic arming
was responsible for mmio_debug enabling, ignore the warns.

If user/dev wants to fix these, he can still do so by

Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
 drivers/gpu/drm/i915/intel_uncore.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index c3c13dc929cb..bfa79e5c214e 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -631,6 +631,15 @@ __unclaimed_reg_debug(struct drm_i915_private *dev_priv,
 		      const bool read,
 		      const bool before)
+	/* XXX. We limit the auto arming traces for mmio
+	 * debugs on these platforms. There are just too many
+	 * revealed by these and CI/Bat suffers from the noise.
+	 * Please fix and then re-enable the automatic traces.
+	 */
+	if (i915.mmio_debug < 2 &&
+	    (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
+		return;
 	if (WARN(check_for_unclaimed_mmio(dev_priv),
 		 "Unclaimed register detected %s %s register 0x%x\n",
 		 before ? "before" : "after",

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