[Intel-gfx] [PATCH 1/2] drm/i915: Clear per-engine fault register as early as possible

[Chris Wilson]

>From gen6, the hardware tracks address lookup failures and so that we do
not trigger false positives from errors before we are initialised we
clear those upon startup (intel_uncore_early_sanitize()). However, this
is actually before we have the engines defined and this turns out to be
a nop. The earliest we can do so is inside intel_engine_setup().

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index e28873cb0672..251e125a214f 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -97,6 +97,9 @@ intel_engine_setup(struct drm_i915_private *dev_priv,
 	engine->mmio_base = info->mmio_base;
 	engine->irq_shift = info->irq_shift;
 
+	if (INTEL_GEN(dev_priv) >= 6)
+		I915_WRITE(RING_FAULT_REG(engine), 0);
+
 	return engine;
 }
 
-- 
2.8.1