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Date: Thu, 02 May 2013 13:10:17 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Prabhakar Lad <prabhakar.csengg@...il.com>
Cc: LMML <linux-media@...r.kernel.org>,
Mauro Carvalho Chehab <mchehab@...hat.com>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
Hans Verkuil <hans.verkuil@...co.com>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
LKML <linux-kernel@...r.kernel.org>,
Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH v2] media: i2c: tvp7002: enable TVP7002 decoder for media controller based usage
Ho Prabhakar,
Thank you for the patch.
On Thursday 02 May 2013 11:14:42 Prabhakar Lad wrote:
> From: Lad, Prabhakar <prabhakar.csengg@...il.com>
>
> This patch enables tvp7002 decoder driver for media controller
> based usage by adding v4l2_subdev_pad_ops operations support
> for enum_mbus_code, set_pad_format, get_pad_format and media_entity_init()
> on probe and media_entity_cleanup() on remove.
>
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
> Changes for v2:
> 1: Fixed review comment pointed by Laurent, Don’t return error for set_fmt
> but fix the input parameters according to current timings.
>
> drivers/media/i2c/tvp7002.c | 122 ++++++++++++++++++++++++++++++++++++++--
> include/media/tvp7002.h | 2 +
> 2 files changed, 119 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/i2c/tvp7002.c b/drivers/media/i2c/tvp7002.c
> index 027809c..3be687e 100644
> --- a/drivers/media/i2c/tvp7002.c
> +++ b/drivers/media/i2c/tvp7002.c
[snip]
> +/*
> + * tvp7002_set_pad_format() - set video format on pad
> + * @sd: pointer to standard V4L2 sub-device structure
> + * @fh: file handle for the subdev
> + * @fmt: pointer to subdev format struct
> + *
> + * set video format for pad.
> + */
> +static int
> +tvp7002_set_pad_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct tvp7002 *tvp7002 = to_tvp7002(sd);
> +
> + /* if format doesn’t match the current timings fix the input
> + * parameters according to what device supports.
> + */
> + if (fmt->format.field != tvp7002->current_timings->scanmode ||
> + fmt->format.code != V4L2_MBUS_FMT_YUYV10_1X20 ||
> + fmt->format.colorspace != tvp7002->current_timings->color_space ||
> + fmt->format.width != tvp7002->current_timings->timings.bt.width ||
> + fmt->format.height != tvp7002->current_timings->timings.bt.height) {
> + fmt->format.field = tvp7002->current_timings->scanmode;
> + fmt->format.code = V4L2_MBUS_FMT_YUYV10_1X20;
> + fmt->format.colorspace = tvp7002->current_timings->color_space;
> + fmt->format.width = tvp7002->current_timings->timings.bt.width;
> + fmt->format.height =
> + tvp7002->current_timings->timings.bt.height;
> + }
You can do this unconditionally.
> + tvp7002->format = fmt->format;
That's not valid for TRY formats.
As the format is fixed, I would get rid of the struct tvp7002 format field,
remove the ACTIVE format check below, and just call tvp7002_get_pad_format in
tvp7002_set_pad_format.
static int
tvp7002_get_pad_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *fmt)
{
struct tvp7002 *tvp7002 = to_tvp7002(sd);
fmt->format.code = V4L2_MBUS_FMT_YUYV10_1X20;
fmt->format.width = tvp7002->current_timings->timings.bt.width;
fmt->format.height = tvp7002->current_timings->timings.bt.height;
fmt->format.field = tvp7002->current_timings->scanmode;
fmt->format.colorspace = tvp7002->current_timings->color_space;
return 0;
}
static int
tvp7002_set_pad_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *fmt)
{
return tvp7002_get_pad_format(sd, fh, fmt);
}
> + return 0;
> +}
> +
> +/*
> + * tvp7002_get_pad_format() - get video format on pad
> + * @sd: pointer to standard V4L2 sub-device structure
> + * @fh: file handle for the subdev
> + * @fmt: pointer to subdev format struct
> + *
> + * get video format for pad.
> + */
> +static int
> +tvp7002_get_pad_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
> + struct v4l2_subdev_format *fmt)
> +{
> + struct tvp7002 *tvp7002 = to_tvp7002(sd);
> +
> + if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> + fmt->format = tvp7002->format;
> + return 0;
> + }
> +
> + fmt->format.code = V4L2_MBUS_FMT_YUYV10_1X20;
> + fmt->format.width = tvp7002->current_timings->timings.bt.width;
> + fmt->format.height = tvp7002->current_timings->timings.bt.height;
> + fmt->format.field = tvp7002->current_timings->scanmode;
> + fmt->format.colorspace = tvp7002->current_timings->color_space;
> +
> + return 0;
> +}
[snip]
> @@ -993,19 +1087,35 @@ static int tvp7002_probe(struct i2c_client *c, const
> struct i2c_device_id *id) timings = device->current_timings->timings;
> error = tvp7002_s_dv_timings(sd, &timings);
>
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + strlcpy(sd->name, TVP7002_MODULE_NAME, sizeof(sd->name));
> + device->pad.flags = MEDIA_PAD_FL_SOURCE;
> + device->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + device->sd.entity.flags |= MEDIA_ENT_T_V4L2_SUBDEV_DECODER;
> +
> + error = media_entity_init(&device->sd.entity, 1, &device->pad, 0);
> + if (error < 0)
> + return error;
> +#endif
> +
> v4l2_ctrl_handler_init(&device->hdl, 1);
> v4l2_ctrl_new_std(&device->hdl, &tvp7002_ctrl_ops,
> V4L2_CID_GAIN, 0, 255, 1, 0);
> sd->ctrl_handler = &device->hdl;
> if (device->hdl.error) {
> - int err = device->hdl.error;
> -
> - v4l2_ctrl_handler_free(&device->hdl);
> - return err;
> + error = device->hdl.error;
> + goto done;
> }
> v4l2_ctrl_handler_setup(&device->hdl);
>
> return 0;
> +
> +done:
Please rename the label to 'error', as it only handles error cases.
> + v4l2_ctrl_handler_free(&device->hdl);
> +#if defined(CONFIG_MEDIA_CONTROLLER)
> + media_entity_cleanup(&device->sd.entity);
> +#endif
> + return error;
> }
--
Regards,
Laurent Pinchart
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