On 11/3/21 10:08 AM, Sakari Ailus wrote:
> Hi Eugen,
>
> Thanks for the patch.
>
> On Tue, Nov 02, 2021 at 05:30:08PM +0200, Eugen Hristev wrote:
>> Implement the get_mbus_config callback.
>> ov7740 is a parallel sensor, and according to datasheet, the register
>> REG12 controls the CCIR656 mode. This register is written to 0 in yuyv mode.
>> According to REG12[5] , CCIR656 mode, the behavior is:
>> CCIR656: disabled
>> REG28 controls the polarity of the signals. This register is unused.
>> The default behavior is then:
>> HSYNC polarity : positive
>> VSYNC polarity : positive
>> HREF polarity: positive
>>
>
> Doesn't the receiver driver get this information from DT?
>
Hi Sakari,
This patch comes as a result of my discussions with Jacopo, he advised
to get mbus configuration via the get_mbus_config . I agree that this
information can be taken from DT as you said.
In the end , my understanding is that get_mbus_config should be used
only for runtime configuration which can change.
Thus, if all this information is static, then, I will proceed with
obtaining it from DT, and you can disregard this patch, as it is not useful.
Thanks,
Eugen
>> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
>> ---
>> drivers/media/i2c/ov7740.c | 14 ++++++++++++++
>> 1 file changed, 14 insertions(+)
>>
>> diff --git a/drivers/media/i2c/ov7740.c b/drivers/media/i2c/ov7740.c
>> index 2539cfee85c8..f8a717aecb6f 100644
>> --- a/drivers/media/i2c/ov7740.c
>> +++ b/drivers/media/i2c/ov7740.c
>> @@ -873,12 +873,26 @@ static int ov7740_get_fmt(struct v4l2_subdev *sd,
>> return ret;
>> }
>>
>> +static int ov7740_get_mbus_config(struct v4l2_subdev *sd,
>> + unsigned int pad,
>> + struct v4l2_mbus_config *cfg)
>> +{
>> + cfg->type = V4L2_MBUS_PARALLEL;
>> + cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
>> + V4L2_MBUS_VSYNC_ACTIVE_HIGH |
>> + V4L2_MBUS_PCLK_SAMPLE_RISING |
>> + V4L2_MBUS_FIELD_EVEN_LOW | V4L2_MBUS_DATA_ACTIVE_HIGH;
>> +
>> + return 0;
>> +}
>> +
>> static const struct v4l2_subdev_pad_ops ov7740_subdev_pad_ops = {
>> .enum_frame_interval = ov7740_enum_frame_interval,
>> .enum_frame_size = ov7740_enum_frame_size,
>> .enum_mbus_code = ov7740_enum_mbus_code,
>> .get_fmt = ov7740_get_fmt,
>> .set_fmt = ov7740_set_fmt,
>> + .get_mbus_config = ov7740_get_mbus_config,
>> };
>>
>> static const struct v4l2_subdev_ops ov7740_subdev_ops = {
>
> --
> Regards,
>
> Sakari Ailus
>
