From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Add a flag to drm_device which will cause the vblank code to bypass the
disable timer and always disable the vblank interrupt immediately when
the last reference is dropped.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_irq.c | 6 +++---
include/drm/drmP.h | 10 ++++++++++
2 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 20a4855..b008803 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -994,11 +994,11 @@ void drm_vblank_put(struct drm_device *dev, int crtc)
/* Last user schedules interrupt disable */
if (atomic_dec_and_test(&vblank->refcount)) {
- if (drm_vblank_offdelay > 0)
+ if (dev->vblank_disable_immediate || drm_vblank_offdelay == 0)
+ vblank_disable_fn((unsigned long)vblank);
+ else if (drm_vblank_offdelay > 0)
mod_timer(&vblank->disable_timer,
jiffies + ((drm_vblank_offdelay * HZ)/1000));
- else if (drm_vblank_offdelay == 0)
- vblank_disable_fn((unsigned long)vblank);
}
}
EXPORT_SYMBOL(drm_vblank_put);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 979a498..0944544 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1117,6 +1117,16 @@ struct drm_device {
*/
bool vblank_disable_allowed;
+ /*
+ * If true, vblank interrupt will be disabled immediately when the
+ * refcount drops to zero, as opposed to via the vblank disable
+ * timer.
+ * This can be set to true it the hardware has a working vblank
+ * counter and the driver uses drm_vblank_on() and drm_vblank_off()
+ * appropriately.
+ */
+ bool vblank_disable_immediate;
+
/* array of size num_crtcs */
struct drm_vblank_crtc *vblank;
--
1.8.5.5
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