drm/i915: Streamline VLV forcewake handling

It occured to me that when we're trying to wake up both render
and media wells on VLV, we might end up calling the low level
force_wake_get/put two times even though one call would be
enough. Make that happen by figuring out which wells really
need to be woken up based on the forcewake counts.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by:Deepak S <deepak.s@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 9d25edfb8a92f6ed4b6f936fbb7de69a40f410e6..04bd9717b021fff33e3fe46c7af8ef513bc8b6d9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -257,16 +257,16 @@ void vlv_force_wake_get(struct drm_i915_private *dev_priv,
        unsigned long irqflags;
 
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
-       if (FORCEWAKE_RENDER & fw_engine) {
-               if (dev_priv->uncore.fw_rendercount++ == 0)
-                       dev_priv->uncore.funcs.force_wake_get(dev_priv,
-                                                       FORCEWAKE_RENDER);
-       }
-       if (FORCEWAKE_MEDIA & fw_engine) {
-               if (dev_priv->uncore.fw_mediacount++ == 0)
-                       dev_priv->uncore.funcs.force_wake_get(dev_priv,
-                                                       FORCEWAKE_MEDIA);
-       }
+
+       if (fw_engine & FORCEWAKE_RENDER &&
+           dev_priv->uncore.fw_rendercount++ != 0)
+               fw_engine &= ~FORCEWAKE_RENDER;
+       if (fw_engine & FORCEWAKE_MEDIA &&
+           dev_priv->uncore.fw_mediacount++ != 0)
+               fw_engine &= ~FORCEWAKE_MEDIA;
+
+       if (fw_engine)
+               dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_engine);
 
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
@@ -278,19 +278,15 @@ void vlv_force_wake_put(struct drm_i915_private *dev_priv,
 
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
-       if (FORCEWAKE_RENDER & fw_engine) {
-               WARN_ON(dev_priv->uncore.fw_rendercount == 0);
-               if (--dev_priv->uncore.fw_rendercount == 0)
-                       dev_priv->uncore.funcs.force_wake_put(dev_priv,
-                                                       FORCEWAKE_RENDER);
-       }
+       if (fw_engine & FORCEWAKE_RENDER &&
+           --dev_priv->uncore.fw_rendercount != 0)
+               fw_engine &= ~FORCEWAKE_RENDER;
+       if (fw_engine & FORCEWAKE_MEDIA &&
+           --dev_priv->uncore.fw_mediacount != 0)
+               fw_engine &= ~FORCEWAKE_MEDIA;
 
-       if (FORCEWAKE_MEDIA & fw_engine) {
-               WARN_ON(dev_priv->uncore.fw_mediacount == 0);
-               if (--dev_priv->uncore.fw_mediacount == 0)
-                       dev_priv->uncore.funcs.force_wake_put(dev_priv,
-                                                       FORCEWAKE_MEDIA);
-       }
+       if (fw_engine)
+               dev_priv->uncore.funcs.force_wake_put(dev_priv, fw_engine);
 
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 }
@@ -516,27 +512,19 @@ gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 static u##x \
 vlv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
        unsigned fwengine = 0; \
-       unsigned fwcount; \
        REG_READ_HEADER(x); \
-       if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) {   \
-               fwengine = FORCEWAKE_RENDER;            \
-               fwcount = dev_priv->uncore.fw_rendercount;    \
-       }                                               \
-       else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) {       \
-               fwengine = FORCEWAKE_MEDIA;             \
-               fwcount = dev_priv->uncore.fw_mediacount;     \
+       if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) { \
+               if (dev_priv->uncore.fw_rendercount == 0) \
+                       fwengine = FORCEWAKE_RENDER; \
+       } else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) { \
+               if (dev_priv->uncore.fw_mediacount == 0) \
+                       fwengine = FORCEWAKE_MEDIA; \
        }  \
-       if (fwengine != 0) {            \
-               if (fwcount == 0) \
-                       (dev_priv)->uncore.funcs.force_wake_get(dev_priv, \
-                                                               fwengine); \
-               val = __raw_i915_read##x(dev_priv, reg); \
-               if (fwcount == 0) \
-                       (dev_priv)->uncore.funcs.force_wake_put(dev_priv, \
-                                                       fwengine); \
-       } else { \
-               val = __raw_i915_read##x(dev_priv, reg); \
-       } \
+       if (fwengine) \
+               dev_priv->uncore.funcs.force_wake_get(dev_priv, fwengine); \
+       val = __raw_i915_read##x(dev_priv, reg); \
+       if (fwengine) \
+               dev_priv->uncore.funcs.force_wake_put(dev_priv, fwengine); \
        REG_READ_FOOTER; \
 }