drm/i915/vlv: disable PPGTT on early revs v3

Early revs didn't have PPGTT support, so disable there.

v2: add debug msg when disabling on early stepping
v3: enable on other B3 packages as well (untested) (Ville)

References: https://bugs.freedesktop.org/show_bug.cgi?id=79669
References: https://bugs.freedesktop.org/show_bug.cgi?id=79670
Signed-off-by: Jesse Barnes <[email protected]>
Acked-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index eec820aec0224a975325a439c350e57036bd5dc9..6f5d5a1e7c32a9c90a077faa1577d99d0c091274 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -63,6 +63,12 @@ static int sanitize_enable_ppgtt(struct drm_device *dev, int enable_ppgtt)
        }
 #endif
 
+       /* Early VLV doesn't have this */
+       if (IS_VALLEYVIEW(dev) && dev->pdev->revision < 0xb) {
+               DRM_DEBUG_DRIVER("disabling PPGTT on pre-B3 step VLV\n");
+               return 0;
+       }
+
        return HAS_ALIASING_PPGTT(dev) ? 1 : 0;
 }