[Intel-gfx] [PATCH 21/49] drm/i915/bdw: Enable execlists in the hardware

[oscar.mateo at intel.com]

From: Ben Widawsky <benjamin.widawsky at intel.com>

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>

v2: Set Replay Mode to 0 per BSpec

Michel Thierry <michel.thierry at intel.com>

v3: Several rebases.

Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_lrc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_lrc.c b/drivers/gpu/drm/i915/i915_lrc.c
index f0176ff..a726b26 100644
--- a/drivers/gpu/drm/i915/i915_lrc.c
+++ b/drivers/gpu/drm/i915/i915_lrc.c
@@ -252,7 +252,7 @@ int gen8_gem_context_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_engine *ring;
-	int ret = -ENOSYS, ring_id;
+	int ret, ring_id;
 
 	dev_priv->hw_context_size = round_up(GEN8_LR_CONTEXT_SIZE, 4096);
 
@@ -265,8 +265,17 @@ int gen8_gem_context_init(struct drm_device *dev)
 			ring->default_context = NULL;
 			goto err_out;
 		}
+
+		I915_WRITE(RING_MODE_GEN7(ring),
+			_MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
+			_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
+		POSTING_READ(RING_MODE_GEN7(ring));
+
+		DRM_DEBUG_DRIVER("Enabled default logical ring context for %s\n", ring->name);
 	}
 
+	return 0;
+
 err_out:
 	gen8_gem_context_fini(dev);
 	return ret;
-- 
1.9.0