[Intel-gfx] [PATCH 4/4] drm/i915: Make next_seqno debugs entry to use i915_gem_seqno_init

[Mika Kuoppala]

As this debugs entry can be used to set arbitrary value to next_seqno,
use i915_gem_seqno_init to set the next_seqno.

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7047c4a..e669e2e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -903,12 +903,17 @@ i915_next_seqno_write(struct file *filp,
 	if (ret)
 		return ret;
 
-	if (i915_seqno_passed(val, dev_priv->next_seqno)) {
-		dev_priv->next_seqno = val;
-		DRM_DEBUG_DRIVER("Advancing seqno to %u\n", val);
-	} else {
-		ret = -EINVAL;
-	}
+	ret = i915_gem_init_seqno(dev, val - 1);
+	if (ret)
+		return ret;
+
+	dev_priv->next_seqno = val;
+
+	/* Carefully set the last_seqno value so that
+	 * wrap detection still works */
+	dev_priv->last_seqno = val - 1;
+	if (dev_priv->last_seqno == 0)
+		dev_priv->last_seqno--;
 
 	mutex_unlock(&dev->struct_mutex);
 
-- 
1.7.9.5