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path: root/drivers/char/drm/mga_irq.c
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Diffstat (limited to 'drivers/char/drm/mga_irq.c')
-rw-r--r--drivers/char/drm/mga_irq.c72
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;
}