Revert "drm/i915: add MMIO debug output"

We can use mmiotrace instead of our own debug printks.

This reverts commit be282fd48e7492812402a22d73a348c44bf95b63.

Conflicts:

	drivers/gpu/drm/i915/i915_drv.h

drivers/gpu/drm/i915/i915_drv.h

@@ -287,9 +287,6 @@ typedef struct drm_i915_private {
 	int front_offset;
 	int current_page;
 	int page_flipping;
-#define I915_DEBUG_READ (1<<0)
-#define I915_DEBUG_WRITE (1<<1)
-	unsigned long debug_flags;
 
 	wait_queue_head_t irq_queue;
 	atomic_t irq_received;
@@ -1172,26 +1169,8 @@ extern void intel_overlay_print_error_state(struct seq_file *m, struct intel_ove
 		LOCK_TEST_WITH_RETURN(dev, file_priv);			\
 } while (0)
 
-static inline u32 i915_read(struct drm_i915_private *dev_priv, u32 reg)
-{
-	u32 val;
-
-	val = readl(dev_priv->regs + reg);
-	if (dev_priv->debug_flags & I915_DEBUG_READ)
-		printk(KERN_ERR "read 0x%08x from 0x%08x\n", val, reg);
-	return val;
-}
-
-static inline void i915_write(struct drm_i915_private *dev_priv, u32 reg,
-			      u32 val)
-{
-	writel(val, dev_priv->regs + reg);
-	if (dev_priv->debug_flags & I915_DEBUG_WRITE)
-		printk(KERN_ERR "wrote 0x%08x to 0x%08x\n", val, reg);
-}
-
-#define I915_READ(reg)          i915_read(dev_priv, (reg))
-#define I915_WRITE(reg, val)    i915_write(dev_priv, (reg), (val))
+#define I915_READ(reg)          readl(dev_priv->regs + (reg))
+#define I915_WRITE(reg, val)     writel(val, dev_priv->regs + (reg))
 #define I915_READ16(reg)	readw(dev_priv->regs + (reg))
 #define I915_WRITE16(reg, val)	writel(val, dev_priv->regs + (reg))
 #define I915_READ8(reg)		readb(dev_priv->regs + (reg))
@@ -1201,11 +1180,6 @@ static inline void i915_write(struct drm_i915_private *dev_priv, u32 reg,
 #define POSTING_READ(reg)	(void)I915_READ(reg)
 #define POSTING_READ16(reg)	(void)I915_READ16(reg)
 
-#define I915_DEBUG_ENABLE_IO() (dev_priv->debug_flags |= I915_DEBUG_READ | \
-				I915_DEBUG_WRITE)
-#define I915_DEBUG_DISABLE_IO() (dev_priv->debug_flags &= ~(I915_DEBUG_READ | \
-							    I915_DEBUG_WRITE))
-
 #define BEGIN_LP_RING(n) \
 	intel_ring_begin(&dev_priv->render_ring, (n))