drm: fix radeon irq properly

After the previous fix in 2.6.12, this patch should properly fix the
radeon IRQ handling code.

From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 13 insertions, 14 deletions

diff --git a/drivers/char/drm/radeon_irq.c b/drivers/char/drm/radeon_irq.c
index cd25f28e26a3..40474a65f56d 100644
--- a/drivers/char/drm/radeon_irq.c
+++ b/drivers/char/drm/radeon_irq.c
@@ -35,6 +35,14 @@
 #include "radeon_drm.h"
 #include "radeon_drv.h"
 
+static __inline__ u32 radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv, u32 mask)
+{
+        u32 irqs = RADEON_READ(RADEON_GEN_INT_STATUS) & mask;
+        if (irqs)
+                RADEON_WRITE(RADEON_GEN_INT_STATUS, irqs);
+        return irqs;
+}
+
 /* Interrupts - Used for device synchronization and flushing in the
  * following circumstances:
  *
@@ -63,8 +71,8 @@ irqreturn_t radeon_driver_irq_handler( DRM_IRQ_ARGS )
         /* Only consider the bits we're interested in - others could be used
          * outside the DRM
          */
-        stat = RADEON_READ(RADEON_GEN_INT_STATUS)
-             & (RADEON_SW_INT_TEST | RADEON_CRTC_VBLANK_STAT);
+        stat = radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK | 
+                                                  RADEON_CRTC_VBLANK_STAT));
         if (!stat)
                 return IRQ_NONE;
 
@@ -80,19 +88,9 @@ irqreturn_t radeon_driver_irq_handler( DRM_IRQ_ARGS )
                 drm_vbl_send_signals( dev );
         }
 
-        /* Acknowledge interrupts we handle */
-        RADEON_WRITE(RADEON_GEN_INT_STATUS, stat);
         return IRQ_HANDLED;
 }
 
-static __inline__ void radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv)
-{
-        u32 tmp = RADEON_READ( RADEON_GEN_INT_STATUS )
-                & (RADEON_SW_INT_TEST_ACK | RADEON_CRTC_VBLANK_STAT);
-        if (tmp)
-                RADEON_WRITE( RADEON_GEN_INT_STATUS, tmp );
-}
-
 static int radeon_emit_irq(drm_device_t *dev)
 {
         drm_radeon_private_t *dev_priv = dev->dev_private;
@@ -141,7 +139,7 @@ int radeon_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
                 return DRM_ERR(EINVAL);
         }
 
-        radeon_acknowledge_irqs( dev_priv );
+        radeon_acknowledge_irqs(dev_priv, RADEON_CRTC_VBLANK_STAT);
 
         dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
 
@@ -219,7 +217,8 @@ void radeon_driver_irq_preinstall( drm_device_t *dev ) {
         RADEON_WRITE( RADEON_GEN_INT_CNTL, 0 );
 
         /* Clear bits if they're already high */
-        radeon_acknowledge_irqs( dev_priv );
+        radeon_acknowledge_irqs(dev_priv, (RADEON_SW_INT_TEST_ACK |
+                                           RADEON_CRTC_VBLANK_STAT));
 }
 
 void radeon_driver_irq_postinstall( drm_device_t *dev ) {