[PATCH 16/26] drm/i915: set num_fence_regs to 0 if there is no aperture

[Matthew Auld]

From: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>

We can't fence anything without aperture.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Stuart Summers <stuart.summers at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_fence_reg.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
index 615a9f4ef30c..0f1507285128 100644
--- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c
+++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
@@ -828,8 +828,10 @@ void i915_ggtt_init_fences(struct i915_ggtt *ggtt)
 
 	detect_bit_6_swizzle(i915);
 
-	if (INTEL_GEN(i915) >= 7 &&
-	    !(IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)))
+	if (!ggtt->mappable_end)
+		num_fences = 0;
+	else if (INTEL_GEN(i915) >= 7 &&
+		 !(IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)))
 		num_fences = 32;
 	else if (INTEL_GEN(i915) >= 4 ||
 		 IS_I945G(i915) || IS_I945GM(i915) ||
-- 
2.20.1