[PATCH 11/14] media: ov6650: Fix .get_fmt() V4L2_SUBDEV_FORMAT_TRY support

Janusz Krzysztofik
2019-04-08T21:44:07Z

Commit da298c6d98d5 ("[media] v4l2: replace video op g_mbus_fmt by pad
op get_fmt") converted a former ov6650_g_fmt() video operation callback
to an ov6650_get_fmt() pad operation callback. However, the converted
function disregards a format->which flag that pad operations should
obey and always returns active frame format settings.

That can be fixed by always responding to V4L2_SUBDEV_FORMAT_TRY with
-EINVAL, or providing the response from a pad config argument, likely
updated by a former user call to V4L2_SUBDEV_FORMAT_TRY .set_fmt().
Since implementation of the latter is trivial, go for it.

Fixes: da298c6d98d5 ("[media] v4l2: replace video op g_mbus_fmt by pad op get_fmt")
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Cc: stable@vger.kernel.org
---
drivers/media/i2c/ov6650.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c
index f6b0b77c5abf..e72210653f55 100644
--- a/drivers/media/i2c/ov6650.c
+++ b/drivers/media/i2c/ov6650.c
@@ -530,25 +530,27 @@ static int ov6650_get_fmt(struct v4l2_subdev *sd,
if (format->pad)
return -EINVAL;

+ /* initialize response with default media bus frame format */
+ *mf = ov6650_def_fmt;
+
+ /* update media bus format code and frame size */
switch (format->which) {
case V4L2_SUBDEV_FORMAT_ACTIVE:
+ mf->width = priv->rect.width >> priv->half_scale;
+ mf->height = priv->rect.height >> priv->half_scale;
+ mf->code = priv->code;
break;
case V4L2_SUBDEV_FORMAT_TRY:
- if (cfg)
+ if (cfg) {
+ mf->width = cfg->try_fmt.width;
+ mf->height = cfg->try_fmt.height;
+ mf->code = cfg->try_fmt.code;
break;
+ }
/* fall through */
default:
return -EINVAL;
}
-
- /* initialize response with default media bus frame format */
- *mf = ov6650_def_fmt;
-
- /* update media bus format code and frame size */
- mf->width = priv->rect.width >> priv->half_scale;
- mf->height = priv->rect.height >> priv->half_scale;
- mf->code = priv->code;
-
return 0;
}

--
2.21.0