1 files changed, 13 insertions, 8 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index e91687fe41be..c5c21776131a 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -72,6 +72,8 @@ struct omap_crtc {
 	 * XXX maybe fold into apply_work??
 	 */
 	struct work_struct page_flip_work;
+
+	bool ignore_digit_sync_lost;
 };
 
 /* -----------------------------------------------------------------------------
@@ -157,7 +159,7 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 	 * Digit output produces some sync lost interrupts during the first
 	 * frame when enabling, so we need to ignore those.
 	 */
-	omap_irq_unregister(crtc->dev, &omap_crtc->error_irq);
+	omap_crtc->ignore_digit_sync_lost = true;
 
 	framedone_irq = dispc_mgr_get_framedone_irq(channel);
 	vsync_irq = dispc_mgr_get_vsync_irq(channel);
@@ -188,7 +190,9 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 				omap_crtc->name, enable ? "enable" : "disable");
 	}
 
-	omap_irq_register(crtc->dev, &omap_crtc->error_irq);
+	omap_crtc->ignore_digit_sync_lost = false;
+	/* make sure the irq handler sees the value above */
+	mb();
 }
 
 
@@ -260,10 +264,14 @@ static void omap_crtc_error_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 {
 	struct omap_crtc *omap_crtc =
 			container_of(irq, struct omap_crtc, error_irq);
-	struct drm_crtc *crtc = &omap_crtc->base;
+
+	if (omap_crtc->ignore_digit_sync_lost) {
+		irqstatus &= ~DISPC_IRQ_SYNC_LOST_DIGIT;
+		if (!irqstatus)
+			return;
+	}
+
 	DRM_ERROR_RATELIMITED("%s: errors: %08x\n", omap_crtc->name, irqstatus);
-	/* avoid getting in a flood, unregister the irq until next vblank */
-	__omap_irq_unregister(crtc->dev, &omap_crtc->error_irq);
 }
 
 static void omap_crtc_apply_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
@@ -272,9 +280,6 @@ static void omap_crtc_apply_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
 			container_of(irq, struct omap_crtc, apply_irq);
 	struct drm_crtc *crtc = &omap_crtc->base;
 
-	if (!omap_crtc->error_irq.registered)
-		__omap_irq_register(crtc->dev, &omap_crtc->error_irq);
-
 	if (!dispc_mgr_go_busy(omap_crtc->channel)) {
 		struct omap_drm_private *priv =
 				crtc->dev->dev_private;