drm/i915: Disable the BLT on pre-production SNB hardware

It never quite worked despite the numerous workarounds, yet I still see
people trying to use this hardware and filing bug reports. As we no
longer even try to implement the workarounds, since 6a233c78878
(drm/i915/ringbuffer: kill snb blt workaround), simply disable the ring.

v2: Add a message to inform the user about the limited capabilities of
their pre-production hardware.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0fdb3d2..89d62f6 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3726,6 +3726,22 @@ void i915_gem_init_ppgtt(struct drm_device *dev)
        }
 }
 
+static bool
+intel_enable_blt(struct drm_device *dev)
+{
+       if (!HAS_BLT(dev))
+               return false;
+
+       /* The blitter was dysfunctional on early prototypes */
+       if (IS_GEN6(dev) && dev->pdev->revision < 8) {
+               DRM_INFO("BLT not supported on this pre-production hardware;"
+                        " graphics performance will be degraded.\n");
+               return false;
+       }
+
+       return true;
+}
+
 int
 i915_gem_init_hw(struct drm_device *dev)
 {
@@ -3749,7 +3765,7 @@ i915_gem_init_hw(struct drm_device *dev)
                        goto cleanup_render_ring;
        }
 
-       if (HAS_BLT(dev)) {
+       if (intel_enable_blt(dev)) {
                ret = intel_init_blt_ring_buffer(dev);
                if (ret)
                        goto cleanup_bsd_ring;