Hi Sakari,
Thanks for the patch.
On Tuesday 06 March 2012 18:33:08 Sakari Ailus wrote:
> isp_video_check_external_subdevs() will retrieve external subdev's
> bits-per-pixel and pixel rate for the use of other ISP subdevs at streamon
> time. isp_video_check_external_subdevs() is called after pipeline
> validation.
>
> Signed-off-by: Sakari Ailus <sakari.ai...@iki.fi>
> ---
> drivers/media/video/omap3isp/ispvideo.c | 75 ++++++++++++++++++++++++++++
> 1 files changed, 75 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/media/video/omap3isp/ispvideo.c
> b/drivers/media/video/omap3isp/ispvideo.c index 4bc9cca..ef5c770 100644
> --- a/drivers/media/video/omap3isp/ispvideo.c
> +++ b/drivers/media/video/omap3isp/ispvideo.c
> @@ -934,6 +934,77 @@ isp_video_dqbuf(struct file *file, void *fh, struct
> v4l2_buffer *b) file->f_flags & O_NONBLOCK);
> }
>
> +static int isp_video_check_external_subdevs(struct isp_pipeline *pipe)
> +{
> + struct isp_device *isp =
> + container_of(pipe, struct isp_video, pipe)->isp;
Any reason not to pass isp_device * from the caller to this function ?
> + struct media_entity *ents[] = {
> + &isp->isp_csi2a.subdev.entity,
> + &isp->isp_csi2c.subdev.entity,
> + &isp->isp_ccp2.subdev.entity,
> + &isp->isp_ccdc.subdev.entity
> + };
> + struct media_pad *source_pad;
> + struct media_entity *source = NULL;
> + struct media_entity *sink;
> + struct v4l2_subdev_format fmt;
> + struct v4l2_ext_controls ctrls;
> + struct v4l2_ext_control ctrl;
> + int i;
i is allowed to be unsigned in this driver as well ;-)
> + int ret = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(ents); i++) {
> + /* Is the entity part of the pipeline? */
> + if (!(pipe->entities & (1 << ents[i]->id)))
> + continue;
> +
> + /* ISP entities have always sink pad == 0. Find source. */
> + source_pad = media_entity_remote_source(&ents[i]->pads[0]);
> +
Don't you usually avoid blank lines between a variable assignment and checking
it for an error condition ?
> + if (source_pad == NULL)
> + continue;
> +
> + source = source_pad->entity;
> + sink = ents[i];
> + break;
> + }
> +
> + if (!source || media_entity_type(source) != MEDIA_ENT_T_V4L2_SUBDEV)
> + return 0;
> +
> + pipe->external = media_entity_to_v4l2_subdev(source);
> +
> + fmt.pad = source_pad->index;
> + fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
> + ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(sink),
> + pad, get_fmt, NULL, &fmt);
> + BUG_ON(ret < 0);
That's a bit harsh. I'd rather return an error.
> +
> + pipe->external_bpp = omap3isp_video_format_info(
> + fmt.format.code)->bpp;
Maybe you could teachs emacs that 78 characters fit in a 80-columns line ? :-)
> +
> + memset(&ctrls, 0, sizeof(ctrls));
> + memset(&ctrl, 0, sizeof(ctrl));
> +
> + ctrl.id = V4L2_CID_PIXEL_RATE;
> +
> + ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(ctrl.id);
You can leave ctrl_class to 0.
> + ctrls.count = 1;
> + ctrls.controls = &ctrl;
> +
> + ret = v4l2_g_ext_ctrls(pipe->external->ctrl_handler, &ctrls);
> + if (ret < 0) {
> + dev_warn(isp->dev,
> + "no pixel rate control in subdev %s\n",
No need to split this either.
> + pipe->external->name);
> + return ret;
> + }
> +
> + pipe->external_rate = ctrl.value64;
> +
> + return 0;
> +}
> +
> /*
> * Stream management
> *
> @@ -1010,6 +1081,10 @@ isp_video_streamon(struct file *file, void *fh, enum
> v4l2_buf_type type) while ((entity = media_entity_graph_walk_next(&graph)))
> pipe->entities |= 1 << entity->id;
>
> + ret = isp_video_check_external_subdevs(pipe);
> + if (ret < 0)
> + goto err_check_format;
> +
> /* Verify that the currently configured format matches the output of
> * the connected subdev.
> */
--
Regards,
Laurent Pinchart
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