[PATCH 3/3] drm/i915: Don't disable the GPU for older gen on wedging

[Chris Wilson]

If we issue a device level GPU reset on the older gen, it will disable
key components of the GMCH and the display engine. The purpose of
wedging is to simply prevent further GEM usage without disabling KMS, so
we need to be careful when we do issue the reset on wedging.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d9cc4820d224..1c82d5a61c7e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3329,7 +3329,8 @@ void i915_gem_set_wedged(struct drm_i915_private *i915)
 	i915->caps.scheduler = 0;
 
 	/* Even if the GPU reset fails, it should still stop the engines */
-	intel_gpu_reset(i915, ALL_ENGINES);
+	if (INTEL_GEN(i915) >= 5)
+		intel_gpu_reset(i915, ALL_ENGINES);
 
 	/*
 	 * Make sure no one is running the old callback before we proceed with
-- 
2.18.0