drm/i915: Convert wait_for(I915_READ(reg)) to intel_wait_for_register()

By using the out-of-line intel_wait_for_register() not only do we can
efficiency from using the hybrid wait_for() contained within, but we
avoid code bloat from the numerous inlined loops, in total (all patches):

   text    data     bss     dec     hex filename
1078551    4557     416 1083524  108884 drivers/gpu/drm/i915/i915.ko
1070775    4557     416 1075748  106a24 drivers/gpu/drm/i915/i915.ko

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1467297225-21379-39-git-send-email-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 81de230..6bc4c06 100644 (file)
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -298,15 +298,16 @@ gmbus_wait_idle(struct drm_i915_private *dev_priv)
 {
        int ret;
 
-#define C ((I915_READ_NOTRACE(GMBUS2) & GMBUS_ACTIVE) == 0)
-
        if (!HAS_GMBUS_IRQ(dev_priv))
-               return wait_for(C, 10);
+               return intel_wait_for_register(dev_priv,
+                                              GMBUS2, GMBUS_ACTIVE, 0,
+                                              10);
 
        /* Important: The hw handles only the first bit, so set only one! */
        I915_WRITE(GMBUS4, GMBUS_IDLE_EN);
 
-       ret = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
+       ret = wait_event_timeout(dev_priv->gmbus_wait_queue,
+                                (I915_READ_NOTRACE(GMBUS2) & GMBUS_ACTIVE) == 0,
                                 msecs_to_jiffies_timeout(10));
 
        I915_WRITE(GMBUS4, 0);
@@ -315,7 +316,6 @@ gmbus_wait_idle(struct drm_i915_private *dev_priv)
                return 0;
        else
                return -ETIMEDOUT;
-#undef C
 }
 
 static int