The scaler is bypassed when the ISP source/output pad's pixel-format is
set to MEDIA_BUS_FMT_SGRBG10_1X10. Don't allow changing the IFP crop and/or
compose selections when in this mode.

Instead of returning -EINVAL simply return the current (noop) crop and
compose rectangles.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
---
Changes in v4:
- Move crop = v4l2_subdev_state_get_crop(state, 0); up a couple of lines
  to avoid having to call it twice

Changes in v3:
- This is a new patch in v3 of this patch-set, which comes from splitting
  up "media: mt9m114: Fix scaler bypass mode" into multiple patches
- Add src_format local variable
---
 drivers/media/i2c/mt9m114.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c
index d111f9e45d2d9c47de315d06ee8a6adb28700146..5e0fbc34921023e1e7a69ec3d098f936eba93ebb 100644
--- a/drivers/media/i2c/mt9m114.c
+++ b/drivers/media/i2c/mt9m114.c
@@ -1984,7 +1984,7 @@ static int mt9m114_ifp_set_selection(struct v4l2_subdev *sd,
 				     struct v4l2_subdev_state *state,
 				     struct v4l2_subdev_selection *sel)
 {
-	struct v4l2_mbus_framefmt *format;
+	struct v4l2_mbus_framefmt *format, *src_format;
 	struct v4l2_rect *crop;
 	struct v4l2_rect *compose;
 	unsigned int border;
@@ -1997,8 +1997,16 @@ static int mt9m114_ifp_set_selection(struct v4l2_subdev *sd,
 	if (sel->pad != 0)
 		return -EINVAL;
 
-	format = v4l2_subdev_state_get_format(state, 0);
 	crop = v4l2_subdev_state_get_crop(state, 0);
+
+	/* Crop and compose cannot be changed when bypassing the scaler. */
+	src_format = v4l2_subdev_state_get_format(state, 1);
+	if (src_format->code == MEDIA_BUS_FMT_SGRBG10_1X10) {
+		sel->r = *crop;
+		return 0;
+	}
+
+	format = v4l2_subdev_state_get_format(state, 0);
 	compose = v4l2_subdev_state_get_compose(state, 0);
 
 	if (sel->target == V4L2_SEL_TGT_CROP) {
@@ -2043,9 +2051,8 @@ static int mt9m114_ifp_set_selection(struct v4l2_subdev *sd,
 	}
 
 	/* Propagate the compose rectangle to the source format. */
-	format = v4l2_subdev_state_get_format(state, 1);
-	format->width = compose->width;
-	format->height = compose->height;
+	src_format->width = compose->width;
+	src_format->height = compose->height;
 
 	return 0;
 }

-- 
2.52.0