1 files changed, 60 insertions, 12 deletions

diff --git a/drivers/char/drm/mga_irq.c b/drivers/char/drm/mga_irq.c
index bc0b6b5d43a6..52eaa4e788f9 100644
--- a/drivers/char/drm/mga_irq.c
+++ b/drivers/char/drm/mga_irq.c
@@ -41,15 +41,40 @@ irqreturn_t mga_driver_irq_handler( DRM_IRQ_ARGS )
         drm_mga_private_t *dev_priv = 
            (drm_mga_private_t *)dev->dev_private;
         int status;
+        int handled = 0;
+
+        status = MGA_READ(MGA_STATUS);
 
-        status = MGA_READ( MGA_STATUS );
-        
         /* VBLANK interrupt */
         if ( status & MGA_VLINEPEN ) {
                 MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR );
                 atomic_inc(&dev->vbl_received);
                 DRM_WAKEUP(&dev->vbl_queue);
-                drm_vbl_send_signals( dev );
+                drm_vbl_send_signals(dev);
+                handled = 1;
+        }
+
+        /* SOFTRAP interrupt */
+        if (status & MGA_SOFTRAPEN) {
+                const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
+                const u32 prim_end   = MGA_READ(MGA_PRIMEND);
+
+
+                MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
+
+                /* In addition to clearing the interrupt-pending bit, we
+                 * have to write to MGA_PRIMEND to re-start the DMA operation.
+                 */
+                if ( (prim_start & ~0x03) != (prim_end & ~0x03) ) {
+                        MGA_WRITE(MGA_PRIMEND, prim_end);
+                }
+
+                atomic_inc(&dev_priv->last_fence_retired);
+                DRM_WAKEUP(&dev_priv->fence_queue);
+                handled = 1;
+        }
+
+        if ( handled ) {
                 return IRQ_HANDLED;
         }
         return IRQ_NONE;
@@ -73,9 +98,28 @@ int mga_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
         return ret;
 }
 
-void mga_driver_irq_preinstall( drm_device_t *dev ) {
-        drm_mga_private_t *dev_priv = 
-           (drm_mga_private_t *)dev->dev_private;
+int mga_driver_fence_wait(drm_device_t * dev, unsigned int *sequence)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+        unsigned int cur_fence;
+        int ret = 0;
+
+        /* Assume that the user has missed the current sequence number
+         * by about a day rather than she wants to wait for years
+         * using fences.
+         */
+        DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
+                    (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
+                      - *sequence) <= (1 << 23)));
+
+        *sequence = cur_fence;
+
+        return ret;
+}
+
+void mga_driver_irq_preinstall(drm_device_t * dev)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
 
         /* Disable *all* interrupts */
         MGA_WRITE( MGA_IEN, 0 );
@@ -83,12 +127,14 @@ void mga_driver_irq_preinstall( drm_device_t *dev ) {
         MGA_WRITE( MGA_ICLEAR, ~0 );
 }
 
-void mga_driver_irq_postinstall( drm_device_t *dev ) {
-        drm_mga_private_t *dev_priv = 
-           (drm_mga_private_t *)dev->dev_private;
+void mga_driver_irq_postinstall(drm_device_t * dev)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+
+        DRM_INIT_WAITQUEUE( &dev_priv->fence_queue );
 
-        /* Turn on VBL interrupt */
-        MGA_WRITE( MGA_IEN, MGA_VLINEIEN );
+        /* Turn on vertical blank interrupt and soft trap interrupt. */
+        MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
 }
 
 void mga_driver_irq_uninstall( drm_device_t *dev ) {
@@ -98,5 +144,7 @@ void mga_driver_irq_uninstall( drm_device_t *dev ) {
                 return;
 
         /* Disable *all* interrupts */
-        MGA_WRITE( MGA_IEN, 0 );
+        MGA_WRITE(MGA_IEN, 0);
+        
+        dev->irq_enabled = 0;
 }