From: Ville Syrjälä <ville.syrjala@nokia.com>
Date: Thu, 4 Mar 2010 23:13:11 +0000 (+0200)
Subject: OMAP: DSS2: clear spurious SYNC_LOST_DIGIT interrupts
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=75c7d59daf502a4eb040e181120fb83b4a8c0719;p=linux-beck.git

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>
---

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