drm: add support for secondary vertical blank interrupt to i915

When the vertical blank interrupt is enabled for both pipes, pipe A is
considered primary and pipe B secondary. When it's only enabled for one pipe,
it's always considered primary for backwards compatibility.

Signed-off-by: Dave Airlie <airlied@linux.ie>

3 files changed, 27 insertions, 4 deletions

diff --git a/drivers/char/drm/i915_drv.c b/drivers/char/drm/i915_drv.c
index 8e2e6095c4b3..85bcc276f804 100644
--- a/drivers/char/drm/i915_drv.c
+++ b/drivers/char/drm/i915_drv.c
@@ -44,12 +44,14 @@ static struct drm_driver driver = {
          */
         .driver_features =
             DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
-            DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_IRQ_VBL,
+            DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_IRQ_VBL |
+            DRIVER_IRQ_VBL2,
         .load = i915_driver_load,
         .lastclose = i915_driver_lastclose,
         .preclose = i915_driver_preclose,
         .device_is_agp = i915_driver_device_is_agp,
         .vblank_wait = i915_driver_vblank_wait,
+        .vblank_wait2 = i915_driver_vblank_wait2,
         .irq_preinstall = i915_driver_irq_preinstall,
         .irq_postinstall = i915_driver_irq_postinstall,
         .irq_uninstall = i915_driver_irq_uninstall,
diff --git a/drivers/char/drm/i915_drv.h b/drivers/char/drm/i915_drv.h
index fdc2bf192714..5f0c4fa04da2 100644
--- a/drivers/char/drm/i915_drv.h
+++ b/drivers/char/drm/i915_drv.h
@@ -117,6 +117,7 @@ extern int i915_irq_emit(DRM_IOCTL_ARGS);
 extern int i915_irq_wait(DRM_IOCTL_ARGS);
 
 extern int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence);
+extern int i915_driver_vblank_wait2(drm_device_t *dev, unsigned int *sequence);
 extern irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS);
 extern void i915_driver_irq_preinstall(drm_device_t * dev);
 extern void i915_driver_irq_postinstall(drm_device_t * dev);
diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index 0d4a162aa385..33d40187696a 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -60,7 +60,16 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
                 DRM_WAKEUP(&dev_priv->irq_queue);
 
         if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
-                atomic_inc(&dev->vbl_received);
+                if ((dev_priv->vblank_pipe &
+                     (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B))
+                    == (DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B)) {
+                        if (temp & VSYNC_PIPEA_FLAG)
+                                atomic_inc(&dev->vbl_received);
+                        if (temp & VSYNC_PIPEB_FLAG)
+                                atomic_inc(&dev->vbl_received2);
+                } else
+                        atomic_inc(&dev->vbl_received);
+
                 DRM_WAKEUP(&dev->vbl_queue);
                 drm_vbl_send_signals(dev);
         }
@@ -120,7 +129,8 @@ static int i915_wait_irq(drm_device_t * dev, int irq_nr)
         return ret;
 }
 
-int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+static int i915_driver_vblank_do_wait(drm_device_t *dev, unsigned int *sequence,
+                                      atomic_t *counter)
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
         unsigned int cur_vblank;
@@ -132,7 +142,7 @@ int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
         }
 
         DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
-                    (((cur_vblank = atomic_read(&dev->vbl_received))
+                    (((cur_vblank = atomic_read(counter))
                         - *sequence) <= (1<<23)));
         
         *sequence = cur_vblank;
@@ -141,6 +151,16 @@ int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
 }
 
 
+int i915_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
+{
+        return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received);
+}
+
+int i915_driver_vblank_wait2(drm_device_t *dev, unsigned int *sequence)
+{
+        return i915_driver_vblank_do_wait(dev, sequence, &dev->vbl_received2);
+}
+
 /* Needs the lock as it touches the ring.
  */
 int i915_irq_emit(DRM_IOCTL_ARGS)