media: imx274: fix frame interval handling

1) the numerator and/or denominator might be 0, in that case
   fall back to the default frame interval. This is per the spec
   and this caused a v4l2-compliance failure.

2) the updated frame interval wasn't returned in the s_frame_interval
   subdev op.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/i2c/imx274.c b/drivers/media/i2c/imx274.c
index 6011cec5e351d2f2cf16c15e3391578d3318dd40..e6aa9f32b6a83e457d01e0b3856ca6d6803f3a33 100644 (file)
--- a/drivers/media/i2c/imx274.c
+++ b/drivers/media/i2c/imx274.c
@@ -1235,6 +1235,8 @@ static int imx274_s_frame_interval(struct v4l2_subdev *sd,
        ret = imx274_set_frame_interval(imx274, fi->interval);
 
        if (!ret) {
+               fi->interval = imx274->frame_interval;
+
                /*
                 * exposure time range is decided by frame interval
                 * need to update it after frame interval changes
@@ -1730,9 +1732,9 @@ static int imx274_set_frame_interval(struct stimx274 *priv,
                __func__, frame_interval.numerator,
                frame_interval.denominator);
 
-       if (frame_interval.numerator == 0) {
-               err = -EINVAL;
-               goto fail;
+       if (frame_interval.numerator == 0 || frame_interval.denominator == 0) {
+               frame_interval.denominator = IMX274_DEF_FRAME_RATE;
+               frame_interval.numerator = 1;
        }
 
        req_frame_rate = (u32)(frame_interval.denominator