Add i915 ioctls to configure pipes for vblank interrupt.
i915 vblanks can be generated from either pipe a or b, however a disabled
pipe generates no interrupts. This change allows the X server to select
which pipe generates vblank interrupts.
From: Keith Packard <keith.packard@intel.com> via DRM CVS
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index a752afd..cd96cfa 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -44,7 +44,8 @@
u16 temp;
temp = I915_READ16(I915REG_INT_IDENTITY_R);
- temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG);
+
+ temp &= (USER_INT_FLAG | VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG);
DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
@@ -58,7 +59,7 @@
if (temp & USER_INT_FLAG)
DRM_WAKEUP(&dev_priv->irq_queue);
- if (temp & VSYNC_PIPEA_FLAG) {
+ if (temp & (VSYNC_PIPEA_FLAG | VSYNC_PIPEB_FLAG)) {
atomic_inc(&dev->vbl_received);
DRM_WAKEUP(&dev->vbl_queue);
drm_vbl_send_signals(dev);
@@ -182,6 +183,68 @@
return i915_wait_irq(dev, irqwait.irq_seq);
}
+static int i915_enable_interrupt (drm_device_t *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ u16 flag;
+
+ flag = 0;
+ if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_A)
+ flag |= VSYNC_PIPEA_FLAG;
+ if (dev_priv->vblank_pipe & DRM_I915_VBLANK_PIPE_B)
+ flag |= VSYNC_PIPEB_FLAG;
+ if (dev_priv->vblank_pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
+ DRM_ERROR("%s called with invalid pipe 0x%x\n",
+ __FUNCTION__, dev_priv->vblank_pipe);
+ return DRM_ERR(EINVAL);
+ }
+ I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | flag);
+ return 0;
+}
+
+/* Set the vblank monitor pipe
+ */
+int i915_vblank_pipe_set(DRM_IOCTL_ARGS)
+{
+ DRM_DEVICE;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ drm_i915_vblank_pipe_t pipe;
+
+ if (!dev_priv) {
+ DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+ return DRM_ERR(EINVAL);
+ }
+
+ DRM_COPY_FROM_USER_IOCTL(pipe, (drm_i915_vblank_pipe_t __user *) data,
+ sizeof(pipe));
+
+ dev_priv->vblank_pipe = pipe.pipe;
+ return i915_enable_interrupt (dev);
+}
+
+int i915_vblank_pipe_get(DRM_IOCTL_ARGS)
+{
+ DRM_DEVICE;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ drm_i915_vblank_pipe_t pipe;
+ u16 flag;
+
+ if (!dev_priv) {
+ DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
+ return DRM_ERR(EINVAL);
+ }
+
+ flag = I915_READ(I915REG_INT_ENABLE_R);
+ pipe.pipe = 0;
+ if (flag & VSYNC_PIPEA_FLAG)
+ pipe.pipe |= DRM_I915_VBLANK_PIPE_A;
+ if (flag & VSYNC_PIPEB_FLAG)
+ pipe.pipe |= DRM_I915_VBLANK_PIPE_B;
+ DRM_COPY_TO_USER_IOCTL((drm_i915_vblank_pipe_t __user *) data, pipe,
+ sizeof(pipe));
+ return 0;
+}
+
/* drm_dma.h hooks
*/
void i915_driver_irq_preinstall(drm_device_t * dev)
@@ -197,7 +260,7 @@
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
- I915_WRITE16(I915REG_INT_ENABLE_R, USER_INT_FLAG | VSYNC_PIPEA_FLAG);
+ i915_enable_interrupt(dev);
DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
}