[Intel-gfx] [PATCH] drm/i915: add cherryview specfic forcewake in execlists_elsp_write

[deepak.s at linux.intel.com]

From: Deepak S <deepak.s at linux.intel.com>

In chv, we have two power wells Render & Media. We need to use
corresponsing forcewake count. If we dont follow this we are getting
error "*ERROR*: Timed out waiting for forcewake old ack to clear" due to
multiple entry into __vlv_force_wake_get.

Signed-off-by: Deepak S <deepak.s at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index bd1b28d..bafd38b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -300,8 +300,18 @@ static void execlists_elsp_write(struct intel_engine_cs *ring,
 	 * Instead, we do the runtime_pm_get/put when creating/destroying requests.
 	 */
 	spin_lock_irqsave(&dev_priv->uncore.lock, flags);
-	if (dev_priv->uncore.forcewake_count++ == 0)
-		dev_priv->uncore.funcs.force_wake_get(dev_priv, FORCEWAKE_ALL);
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		if (dev_priv->uncore.fw_rendercount++ == 0)
+			dev_priv->uncore.funcs.force_wake_get(dev_priv,
+							      FORCEWAKE_RENDER);
+		if (dev_priv->uncore.fw_mediacount++ == 0)
+			dev_priv->uncore.funcs.force_wake_get(dev_priv,
+							      FORCEWAKE_MEDIA);
+	} else {
+		if (dev_priv->uncore.forcewake_count++ == 0)
+			dev_priv->uncore.funcs.force_wake_get(dev_priv,
+							      FORCEWAKE_ALL);
+	}
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, flags);
 
 	I915_WRITE(RING_ELSP(ring), desc[1]);
@@ -315,8 +325,19 @@ static void execlists_elsp_write(struct intel_engine_cs *ring,
 
 	/* Release Force Wakeup (see the big comment above). */
 	spin_lock_irqsave(&dev_priv->uncore.lock, flags);
-	if (--dev_priv->uncore.forcewake_count == 0)
-		dev_priv->uncore.funcs.force_wake_put(dev_priv, FORCEWAKE_ALL);
+	if (IS_CHERRYVIEW(dev_priv->dev)) {
+		if (--dev_priv->uncore.fw_rendercount == 0)
+			dev_priv->uncore.funcs.force_wake_put(dev_priv,
+							      FORCEWAKE_RENDER);
+		if (--dev_priv->uncore.fw_mediacount == 0)
+			dev_priv->uncore.funcs.force_wake_put(dev_priv,
+							      FORCEWAKE_MEDIA);
+	} else {
+		if (--dev_priv->uncore.forcewake_count == 0)
+			dev_priv->uncore.funcs.force_wake_put(dev_priv,
+							      FORCEWAKE_ALL);
+	}
+
 	spin_unlock_irqrestore(&dev_priv->uncore.lock, flags);
 }
 
-- 
1.9.1