[media] m5mols: Optimize the capture set up sequence

Improve the single frame capture set up sequence. Since there is
no need to re-enable the interrupts in each capture sequence, unmask
the required interrupts once at the device initialization time.

Signed-off-by: HeungJun Kim <riverful.kim@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/m5mols/m5mols_capture.c

@@ -108,47 +108,33 @@ int m5mols_start_capture(struct m5mols_info *info)
 	int ret;
 
 	/*
-	 * Preparing capture. Setting control & interrupt before entering
-	 * capture mode
-	 *
-	 * 1) change to MONITOR mode for operating control & interrupt
-	 * 2) set controls (considering v4l2_control value & lock 3A)
-	 * 3) set interrupt
-	 * 4) change to CAPTURE mode
+	 * Synchronize the controls, set the capture frame resolution and color
+	 * format. The frame capture is initiated during switching from Monitor
+	 * to Capture mode.
 	 */
 	ret = m5mols_mode(info, REG_MONITOR);
 	if (!ret)
 		ret = m5mols_sync_controls(info);
 	if (!ret)
-		ret = m5mols_lock_3a(info, true);
+		ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
+	if (!ret)
+		ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, resolution);
 	if (!ret)
-		ret = m5mols_enable_interrupt(sd, REG_INT_CAPTURE);
+		ret = m5mols_lock_3a(info, true);
 	if (!ret)
 		ret = m5mols_mode(info, REG_CAPTURE);
 	if (!ret)
-		/* Wait for capture interrupt, after changing capture mode */
+		/* Wait until a frame is captured to ISP internal memory */
 		ret = m5mols_wait_interrupt(sd, REG_INT_CAPTURE, 2000);
 	if (!ret)
 		ret = m5mols_lock_3a(info, false);
 	if (ret)
 		return ret;
+
 	/*
-	 * Starting capture. Setting capture frame count and resolution and
-	 * the format(available format: JPEG, Bayer RAW, YUV).
-	 *
-	 * 1) select single or multi(enable to 25), format, size
-	 * 2) set interrupt
-	 * 3) start capture(for main image, now)
-	 * 4) get information
-	 * 5) notify file size to v4l2 device(e.g, to s5p-fimc v4l2 device)
+	 * Initiate the captured data transfer to a MIPI-CSI receiver.
 	 */
 	ret = m5mols_write(sd, CAPC_SEL_FRAME, 1);
-	if (!ret)
-		ret = m5mols_write(sd, CAPP_YUVOUT_MAIN, REG_JPEG);
-	if (!ret)
-		ret = m5mols_write(sd, CAPP_MAIN_IMAGE_SIZE, resolution);
-	if (!ret)
-		ret = m5mols_enable_interrupt(sd, REG_INT_CAPTURE);
 	if (!ret)
 		ret = m5mols_write(sd, CAPC_START, REG_CAP_START_MAIN);
 	if (!ret) {

drivers/media/video/m5mols/m5mols_core.c

@@ -788,7 +788,8 @@ static int m5mols_fw_start(struct v4l2_subdev *sd)
 
 	ret = m5mols_write(sd, PARM_INTERFACE, REG_INTERFACE_MIPI);
 	if (!ret)
-		ret = m5mols_enable_interrupt(sd, REG_INT_AF);
+		ret = m5mols_enable_interrupt(sd,
+				REG_INT_AF | REG_INT_CAPTURE);
 
 	return ret;
 }