Hi Akinobu,
sorry for the delayed response.
On 19-01-15 23:05, Akinobu Mita wrote:
> The VIDIOC_SUBDEV_G_FMT ioctl for this driver doesn't recognize
> V4L2_SUBDEV_FORMAT_TRY and always works as if V4L2_SUBDEV_FORMAT_ACTIVE
> is specified.
>
> Cc: Enrico Scholz <enrico.sch...@sigma-chemnitz.de>
> Cc: Michael Grzeschik <m.grzesc...@pengutronix.de>
> Cc: Marco Felsch <m.fel...@pengutronix.de>
> Cc: Sakari Ailus <sakari.ai...@linux.intel.com>
> Cc: Mauro Carvalho Chehab <mche...@kernel.org>
> Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com>
> ---
> * v3
> - Set initial try format with default configuration instead of
> current one.
>
> drivers/media/i2c/mt9m111.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/drivers/media/i2c/mt9m111.c b/drivers/media/i2c/mt9m111.c
> index d639b9b..63a5253 100644
> --- a/drivers/media/i2c/mt9m111.c
> +++ b/drivers/media/i2c/mt9m111.c
> @@ -528,6 +528,16 @@ static int mt9m111_get_fmt(struct v4l2_subdev *sd,
> if (format->pad)
> return -EINVAL;
>
> + if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> + mf = v4l2_subdev_get_try_format(sd, cfg, format->pad);
> + format->format = *mf;
> + return 0;
> +#else
> + return -ENOTTY;
> +#endif
If've checked this again and found the ov* devices do this too. IMO it's
not good for other developers to check the upper layer if the '#else'
path is reachable. There are also some code analyzer tools which will
report this as issue/warning.
As I said, I checked the v4l2_subdev_get_try_format() usage again and
found the solution made by the mt9v111.c better. Why do you don't add a
dependency in the Kconfig, so we can drop this ifdef?
Regards,
Marco
> + }
> +
> mf->width = mt9m111->width;
> mf->height = mt9m111->height;
> mf->code = mt9m111->fmt->code;
> @@ -1089,6 +1099,25 @@ static int mt9m111_s_stream(struct v4l2_subdev *sd,
> int enable)
> return 0;
> }
>
> +static int mt9m111_init_cfg(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg)
> +{
> +#ifdef CONFIG_VIDEO_V4L2_SUBDEV_API
> + struct v4l2_mbus_framefmt *format =
> + v4l2_subdev_get_try_format(sd, cfg, 0);
> +
> + format->width = MT9M111_MAX_WIDTH;
> + format->height = MT9M111_MAX_HEIGHT;
> + format->code = mt9m111_colour_fmts[0].code;
> + format->colorspace = mt9m111_colour_fmts[0].colorspace;
> + format->field = V4L2_FIELD_NONE;
> + format->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> + format->quantization = V4L2_QUANTIZATION_DEFAULT;
> + format->xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +#endif
> + return 0;
> +}
> +
> static int mt9m111_g_mbus_config(struct v4l2_subdev *sd,
> struct v4l2_mbus_config *cfg)
> {
> @@ -1114,6 +1143,7 @@ static const struct v4l2_subdev_video_ops
> mt9m111_subdev_video_ops = {
> };
>
> static const struct v4l2_subdev_pad_ops mt9m111_subdev_pad_ops = {
> + .init_cfg = mt9m111_init_cfg,
> .enum_mbus_code = mt9m111_enum_mbus_code,
> .get_selection = mt9m111_get_selection,
> .set_selection = mt9m111_set_selection,
> --
> 2.7.4
>
>
