On 03/15/16 12:06, Sakari Ailus wrote: > Hi Philippe, > > On Tue, Mar 15, 2016 at 11:14:17AM +0100, Philippe De Muyter wrote: >> Hi, >> >> Sorry if you read the following twice, but the subject of my previous post >> was not precise enough :( >> >> I am in the process of converting a sensor driver compatible with the imx6 >> freescale linux kernel, to a subdev driver compatible with a current kernel >> and Steve Longerbeam's work. >> >> My sensor can work at any fps (even fractional) up to 60 fps with its default >> frame size or even higher when using crop or "binning'. That fact is reflected >> in my previous implemetation of VIDIOC_ENUM_FRAMEINTERVALS, which answered >> with a V4L2_FRMIVAL_TYPE_CONTINUOUS-type reply. >> >> This seem not possible anymore because of the lack of the needed fields >> in the 'struct v4l2_subdev_frame_interval_enum' used to delegate the question >> to the subdev driver. V4L2_FRMIVAL_TYPE_STEPWISE does not seem possible >> anymore either. Has that been replaced by something else or is that >> functionality not considered relevant anymorea ? > > I think the issue was that the CONTINUOUS and STEPWISE were considered too > clumsy for applications and practically no application was using them, or at > least the need for these was not seen to be there. They were not added to > the V4L2 sub-device implementation of the interface as a result. It never made sense to me why the two APIs weren't kept the same. My suggestion would be to add step_width and step_height fields to struct v4l2_subdev_frame_size_enum, that way you have the same functionality back. I.e. for discrete formats the min values equal the max values, for continuous formats the step values are both 1 (or 0 for compability's sake) and the remainder maps to a stepwise range. Regards, Hans > > Cc Hans. > > The smiapp driver uses horizontal and vertical blanking controls for > changing the frame rate. That's a bit lower level interface than most > drivers use, but then you have to provide enough other information to the > user space as well, including the pixel rate. > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
