OMAP: DSS2: clear spurious SYNC_LOST_DIGIT interrupts

When DSS transitions from off mode to on VENC may generate a spurious
SYNC_LOST_DIGIT error. Just ack it when restoring the context. Also
restore IRQENABLE last to avoid triggering interrupts before the
context is fully restored.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index e777e352dbcd..b8c16034f1ea 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -335,7 +335,7 @@ void dispc_save_context(void)
 void dispc_restore_context(void)
 {
         RR(SYSCONFIG);
-        RR(IRQENABLE);
+        /*RR(IRQENABLE);*/
         /*RR(CONTROL);*/
         RR(CONFIG);
         RR(DEFAULT_COLOR0);
@@ -472,6 +472,15 @@ void dispc_restore_context(void)
 
         /* enable last, because LCD & DIGIT enable are here */
         RR(CONTROL);
+
+        /* clear spurious SYNC_LOST_DIGIT interrupts */
+        dispc_write_reg(DISPC_IRQSTATUS, DISPC_IRQ_SYNC_LOST_DIGIT);
+
+        /*
+         * enable last so IRQs won't trigger before
+         * the context is fully restored
+         */
+        RR(IRQENABLE);
 }
 
 #undef SR