[media] omap3isp: ccdc: Restart the CCDC immediately after an underrun in BT.656

As the CCDC doesn't generate interrupts when stopped in BT.656 mode,
restart it immediately when the next buffer after an underrun is queued
instead of relying on the interrupt handler to restart the CCDC.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Enrico Butera <ebutera@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/omap3isp/ispccdc.c

@@ -1789,6 +1789,8 @@ int omap3isp_ccdc_isr(struct isp_ccdc_device *ccdc, u32 events)
 static int ccdc_video_queue(struct isp_video *video, struct isp_buffer *buffer)
 {
 	struct isp_ccdc_device *ccdc = &video->isp->isp_ccdc;
+	unsigned long flags;
+	bool restart = false;
 
 	if (!(ccdc->output & CCDC_OUTPUT_MEMORY))
 		return -ENODEV;
@@ -1797,9 +1799,20 @@ static int ccdc_video_queue(struct isp_video *video, struct isp_buffer *buffer)
 
 	/* We now have a buffer queued on the output, restart the pipeline
 	 * on the next CCDC interrupt if running in continuous mode (or when
-	 * starting the stream).
+	 * starting the stream) in external sync mode, or immediately in BT.656
+	 * sync mode as no CCDC interrupt is generated when the CCDC is stopped
+	 * in that case.
 	 */
-	ccdc->underrun = 1;
+	spin_lock_irqsave(&ccdc->lock, flags);
+	if (ccdc->state == ISP_PIPELINE_STREAM_CONTINUOUS && !ccdc->running &&
+	    ccdc->bt656)
+		restart = 1;
+	else
+		ccdc->underrun = 1;
+	spin_unlock_irqrestore(&ccdc->lock, flags);
+
+	if (restart)
+		ccdc_enable(ccdc);
 
 	return 0;
 }