[PATCH 2/3] drm/i915: Clear wedged status upon resume

[Chris Wilson]

When we wake up from suspend, the device has been powered down and
should come back afresh. We should be able to safely remove the wedged
status from the previous session and start afresh.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170826110935.10237-2-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a1ba989f8da5..b99a668f39a7 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4523,6 +4523,12 @@ static void assert_kernel_context_is_current(struct drm_i915_private *dev_priv)
 
 void i915_gem_sanitize(struct drm_i915_private *i915)
 {
+	if (i915_terminally_wedged(&i915->gpu_error)) {
+		mutex_lock(&i915->drm.struct_mutex);
+		i915_gem_unset_wedged(i915);
+		mutex_unlock(&i915->drm.struct_mutex);
+	}
+
 	/*
 	 * If we inherit context state from the BIOS or earlier occupants
 	 * of the GPU, the GPU may be in an inconsistent state when we
-- 
2.14.1