On 07/03/18 23:04, Niklas Söderlund wrote:
> If the field is not supported by the driver it should not try to keep
> the current field. Instead it should set it to a default fallback. Since
> trying a format should always result in the same state regardless of the
> current state of the device.
>
> Signed-off-by: Niklas Söderlund <[email protected]>
> Reviewed-by: Laurent Pinchart <[email protected]>
> ---
> drivers/media/platform/rcar-vin/rcar-v4l2.c | 9 +++------
> 1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> index c2265324c7c96308..ebcd78b1bb6e8cb6 100644
> --- a/drivers/media/platform/rcar-vin/rcar-v4l2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-v4l2.c
> @@ -23,6 +23,7 @@
> #include "rcar-vin.h"
>
> #define RVIN_DEFAULT_FORMAT V4L2_PIX_FMT_YUYV
> +#define RVIN_DEFAULT_FIELD V4L2_FIELD_NONE
>
> /*
> -----------------------------------------------------------------------------
> * Format Conversions
> @@ -143,7 +144,7 @@ static int rvin_reset_format(struct rvin_dev *vin)
> case V4L2_FIELD_INTERLACED:
> break;
> default:
> - vin->format.field = V4L2_FIELD_NONE;
> + vin->format.field = RVIN_DEFAULT_FIELD;
> break;
> }
>
> @@ -213,10 +214,6 @@ static int __rvin_try_format(struct rvin_dev *vin,
> u32 walign;
> int ret;
>
> - /* Keep current field if no specific one is asked for */
> - if (pix->field == V4L2_FIELD_ANY)
> - pix->field = vin->format.field;
> -
> /* If requested format is not supported fallback to the default */
> if (!rvin_format_from_pixel(pix->pixelformat)) {
> vin_dbg(vin, "Format 0x%x not found, using default 0x%x\n",
> @@ -246,7 +243,7 @@ static int __rvin_try_format(struct rvin_dev *vin,
> case V4L2_FIELD_INTERLACED:
> break;
> default:
> - pix->field = V4L2_FIELD_NONE;
> + pix->field = RVIN_DEFAULT_FIELD;
> break;
> }
>
>
I wonder if this code is correct. What if the adv7180 is the source? Does that
even
support FIELD_NONE? I suspect that the default field should actually depend on
the
source. FIELD_NONE for dv_timings based or sensor based subdevs and
FIELD_INTERLACED
for SDTV (g/s_std) subdevs.
I might very well be missing something here but it looks suspicious.
Regards,
Hans
