Hi Sylwester,
On Saturday 18 February 2012 00:33:23 Sylwester Nawrocki wrote:
> On 02/18/2012 12:23 AM, Laurent Pinchart wrote:
> >> struct v4l2_subdev_video_ops {
> >>
> >> int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32
> >>
> >> config); @@ -321,6 +329,8 @@ struct v4l2_subdev_video_ops {
> >>
> >> struct v4l2_mbus_config *cfg);
> >>
> >> int (*s_mbus_config)(struct v4l2_subdev *sd,
> >>
> >> const struct v4l2_mbus_config *cfg);
> >>
> >> + int (*g_embedded_data)(struct v4l2_subdev *sd, unsigned int *size,
> >> + void **buf);
> >>
> >> };
> >
> > How is the embedded data transferred from the sensor to the host in your
> > case ? Over I2C ?
>
> It's transferred over MIPI-CSI2 bus and is intercepted by the MIPI-CSI2
> receiver, before the image data DMA. The MIPI-CSI2 doesn't have its own
> DMA engine. More details can be found in patch 6/6.
As the data is transmitted by the device without any polling from the host,
shouldn't it just go to a metadata plane in the V4L2 buffer ?
--
Regards,
Laurent Pinchart
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