drm/i915: disable contexts on old HW

This got dropped as a result of the last round of comments. I didn't
test it on unsupported HW (which this is likely the case).

Note that this prevents hw context from blowing up on any pre-gen6 hw.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=51142
[danvet: Added note and buglink.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 6dc426a48b2d982ef434a2bba2c75d6534a903f8..8fb8cd8f632084cc670041bdaa8770c82defa8c2 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -243,8 +243,10 @@ void i915_gem_context_init(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        uint32_t ctx_size;
 
-       if (!HAS_HW_CONTEXTS(dev))
+       if (!HAS_HW_CONTEXTS(dev)) {
+               dev_priv->hw_contexts_disabled = true;
                return;
+       }
 
        /* If called from reset, or thaw... we've been here already */
        if (dev_priv->hw_contexts_disabled ||