[Intel-gfx] [PATCH 47/53] drm/i915: Update ironlake_enable_rc6() to do explicit request management

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Updated ironlake_enable_rc6() to do explicit request creation and submission.

v2: Fixed null context bug.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c |   31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f7c9938..6594a52 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4985,6 +4985,7 @@ static void ironlake_enable_rc6(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_engine_cs *ring = &dev_priv->ring[RCS];
+	struct drm_i915_gem_request *req = NULL;
 	bool was_interruptible;
 	int ret;
 
@@ -5003,16 +5004,17 @@ static void ironlake_enable_rc6(struct drm_device *dev)
 	was_interruptible = dev_priv->mm.interruptible;
 	dev_priv->mm.interruptible = false;
 
+	ret = dev_priv->gt.alloc_request(ring, ring->default_context, &req);
+	if (ret)
+		goto err;
+
 	/*
 	 * GPU can automatically power down the render unit if given a page
 	 * to save state.
 	 */
 	ret = intel_ring_begin(ring, 6);
-	if (ret) {
-		ironlake_teardown_rc6(dev);
-		dev_priv->mm.interruptible = was_interruptible;
-		return;
-	}
+	if (ret)
+		goto err;
 
 	intel_ring_emit(ring, MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN);
 	intel_ring_emit(ring, MI_SET_CONTEXT);
@@ -5026,6 +5028,11 @@ static void ironlake_enable_rc6(struct drm_device *dev)
 	intel_ring_emit(ring, MI_FLUSH);
 	intel_ring_advance(ring);
 
+	ret = i915_add_request_no_flush(req);
+	if (ret)
+		goto err;
+	req = NULL;
+
 	/*
 	 * Wait for the command parser to advance past MI_SET_CONTEXT. The HW
 	 * does an implicit flush, combined with MI_FLUSH above, it should be
@@ -5033,16 +5040,20 @@ static void ironlake_enable_rc6(struct drm_device *dev)
 	 */
 	ret = intel_ring_idle(ring);
 	dev_priv->mm.interruptible = was_interruptible;
-	if (ret) {
-		DRM_ERROR("failed to enable ironlake power savings\n");
-		ironlake_teardown_rc6(dev);
-		return;
-	}
+	if (ret)
+		goto err;
 
 	I915_WRITE(PWRCTXA, i915_gem_obj_ggtt_offset(dev_priv->ips.pwrctx) | PWRCTX_EN);
 	I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
 
 	intel_print_rc6_info(dev, GEN6_RC_CTL_RC6_ENABLE);
+
+err:
+	DRM_ERROR("failed to enable ironlake power savings\n");
+	ironlake_teardown_rc6(dev);
+	dev_priv->mm.interruptible = was_interruptible;
+	if (req)
+		i915_gem_request_unreference(req);
 }
 
 static unsigned long intel_pxfreq(u32 vidfreq)
-- 
1.7.9.5