From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
The vblank interrupt is used by the driver as a completion signal when
applying new settings.
A race condition exist between enabling the vblank interrupt and
applying new settings to the hardware by setting the GO bit. If a vblank
interrupt occurs in-between, the driver will incorrectly consider the
new settings to be applied. Fix this by enabling the interrupt after
setting the GO bit.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/omapdrm/omap_crtc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index c7d3e1eec6cb..3f811186c891 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -501,8 +501,8 @@ static void apply_worker(struct work_struct *work)
DBG("%s: GO", omap_crtc->name);
if (dispc_mgr_is_enabled(channel)) {
- omap_irq_register(dev, &omap_crtc->apply_irq);
dispc_mgr_go(channel);
+ omap_irq_register(dev, &omap_crtc->apply_irq);
} else {
struct omap_drm_private *priv = dev->dev_private;
queue_work(priv->wq, &omap_crtc->apply_work);
--
2.3.3
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