drm/i915: Only print an message if there was an error

Only report an error if the GPU has actually detected one, otherwise we
are just hung.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 24 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index b5dba4795f6f..2479be001e40 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -692,24 +692,13 @@ void i915_destroy_error_state(struct drm_device *dev)
                 i915_error_state_free(dev, error);
 }
 
-/**
- * i915_handle_error - handle an error interrupt
- * @dev: drm device
- *
- * Do some basic checking of regsiter state at error interrupt time and
- * dump it to the syslog.  Also call i915_capture_error_state() to make
- * sure we get a record and make it available in debugfs.  Fire a uevent
- * so userspace knows something bad happened (should trigger collection
- * of a ring dump etc.).
- */
-static void i915_handle_error(struct drm_device *dev, bool wedged)
+static void i915_report_and_clear_eir(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
         u32 eir = I915_READ(EIR);
-        u32 pipea_stats = I915_READ(PIPEASTAT);
-        u32 pipeb_stats = I915_READ(PIPEBSTAT);
 
-        i915_capture_error_state(dev);
+        if (!eir)
+                return;
 
         printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
                eir);
@@ -755,6 +744,9 @@ static void i915_handle_error(struct drm_device *dev, bool wedged)
         }
 
         if (eir & I915_ERROR_MEMORY_REFRESH) {
+                u32 pipea_stats = I915_READ(PIPEASTAT);
+                u32 pipeb_stats = I915_READ(PIPEBSTAT);
+
                 printk(KERN_ERR "memory refresh error\n");
                 printk(KERN_ERR "PIPEASTAT: 0x%08x\n",
                        pipea_stats);
@@ -811,6 +803,24 @@ static void i915_handle_error(struct drm_device *dev, bool wedged)
                 I915_WRITE(EMR, I915_READ(EMR) | eir);
                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
         }
+}
+
+/**
+ * i915_handle_error - handle an error interrupt
+ * @dev: drm device
+ *
+ * Do some basic checking of regsiter state at error interrupt time and
+ * dump it to the syslog.  Also call i915_capture_error_state() to make
+ * sure we get a record and make it available in debugfs.  Fire a uevent
+ * so userspace knows something bad happened (should trigger collection
+ * of a ring dump etc.).
+ */
+static void i915_handle_error(struct drm_device *dev, bool wedged)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+
+        i915_capture_error_state(dev);
+        i915_report_and_clear_eir(dev);
 
         if (wedged) {
                 atomic_set(&dev_priv->mm.wedged, 1);