Hi Todor,
Todor Tomov wrote:
> Hi Sakari,
>
> One more question below:
>
> On 08/25/2016 10:18 AM, Sakari Ailus wrote:
>>>>> +
>>>>> +static struct v4l2_subdev_core_ops ov5645_core_ops = {
>>>>> + .s_power = ov5645_s_power,
>>>>> +};
>>>>> +
>>>>> +static struct v4l2_subdev_video_ops ov5645_video_ops = {
>>>>> + .s_stream = ov5645_s_stream,
>>>>> +};
>>>>> +
>>>>> +static struct v4l2_subdev_pad_ops ov5645_subdev_pad_ops = {
>>>>> + .enum_mbus_code = ov5645_enum_mbus_code,
>>>>> + .enum_frame_size = ov5645_enum_frame_size,
>>>>> + .get_fmt = ov5645_get_format,
>>>>> + .set_fmt = ov5645_set_format,
>>>>> + .get_selection = ov5645_get_selection,
>>>>
>>>> Could you add init_cfg() pad op to initialise the try format and selections?
>>>
>>> Yes, I'll do that.
>
> If I follow the code correctly this init_cfg() is called whenever the device is opened, right?
> This means that the format will be reset to default values every time the userspace opens the device.
> So I wonder if this is what we really want, or do we want to keep the last set format instead. For
> example if we use media-ctl only to get the current format, this is already enough - it opens the
> subdev node and resets the format to default.
What's getting set in init_cfg() called through open system call is the
try format, not the active format.
Whether to choose the default or current format for the try format for a
file handle was discussed some years ago and we indeed settled to use
the default one, since that's independent of whatever configuration
happened to be set --- quite possibly by a different application. AFAIR.
--
Kind regards,
Sakari Ailus
sakari.ailus@xxxxxx
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