Hi Kieran,
Thank you for the patch.
On Friday 10 Feb 2017 20:27:36 Kieran Bingham wrote:
> Increase the overlap on the left edge to allow a margin to provide
> better image scaling
-EIMPOSSIBLE_TO_REVIEW I'm afraid, we need more detailed documentation.
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/platform/vsp1/vsp1_rpf.c | 7 +++++-
> drivers/media/platform/vsp1/vsp1_uds.c | 39 ++++++++++++++++++++++++---
> 2 files changed, 42 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_rpf.c
> b/drivers/media/platform/vsp1/vsp1_rpf.c index 94541ab4ca36..d08cfd944b7b
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_rpf.c
> +++ b/drivers/media/platform/vsp1/vsp1_rpf.c
> @@ -247,6 +247,13 @@ struct vsp1_partition_rect *rpf_partition(struct
> vsp1_entity *entity, /* Duplicate the target configuration to the RPF */
> partition->rpf = *dest;
>
> + /*
> + * A partition offset, is a request for more input pixels, and a
> + * declaration that the consumer will clip excess.
> + */
> + partition->rpf.width += dest->offset;
> + partition->rpf.left -= dest->offset;
> +
> return &partition->rpf;
> }
>
> diff --git a/drivers/media/platform/vsp1/vsp1_uds.c
> b/drivers/media/platform/vsp1/vsp1_uds.c index 9c1fb7ef3c46..9ee476c8db59
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_uds.c
> +++ b/drivers/media/platform/vsp1/vsp1_uds.c
> @@ -81,6 +81,20 @@ static struct uds_phase uds_phase_calculation(int
> position, int start_phase, return phase;
> }
>
> +static int uds_left_src_pixel(int pos, int start_phase, int ratio)
> +{
> + struct uds_phase phase;
> +
> + phase = uds_phase_calculation(pos, start_phase, ratio);
> +
> + /* Renesas guard against odd values in these scale ratios here ? */
> + if ((phase.mp == 2 && (phase.residual & 0x01)) ||
> + (phase.mp == 4 && (phase.residual & 0x03)))
> + WARN_ON(1);
That's harsh. Can it happen, or can we prove it can't happen ?
> + return phase.mp * (phase.prefilt_outpos + (phase.residual ? 1 : 0));
> +}
> +
> static int uds_start_phase(int pos, int start_phase, int ratio)
> {
> struct uds_phase phase;
> @@ -420,6 +434,8 @@ struct vsp1_partition_rect *uds_partition(struct
> vsp1_entity *entity, const struct v4l2_mbus_framefmt *input;
> unsigned int hscale;
> unsigned int image_start_phase = 0;
> + unsigned int right_sink;
> + unsigned int margin;
>
> /* Initialise the partition state */
> partition->uds_sink = *dest;
> @@ -432,10 +448,25 @@ struct vsp1_partition_rect *uds_partition(struct
> vsp1_entity *entity,
>
> hscale = uds_compute_ratio(input->width, output->width);
>
> - partition->uds_sink.width = dest->width * input->width
> - / output->width;
> - partition->uds_sink.left = dest->left * input->width
> - / output->width;
> + /* Handle 'left' edge of the partitions */
> + if (partition_idx == 0) {
> + margin = 0;
> + } else {
> + margin = hscale < 0x200 ? 32 : /* 8 < scale */
> + hscale < 0x400 ? 16 : /* 4 < scale <= 8 */
> + hscale < 0x800 ? 8 : /* 2 < scale <= 4 */
> + 4; /* 1 < scale <= 2, scale <= 1
*/
> + }
> +
> + partition->uds_sink.left = uds_left_src_pixel(dest->left,
> + image_start_phase, hscale);
> +
> + partition->uds_sink.offset = margin;
> +
> + right_sink = uds_left_src_pixel(dest->left + dest->width - 1,
> + image_start_phase, hscale);
> +
> + partition->uds_sink.width = right_sink - partition->uds_sink.left + 1;
>
> partition->start_phase = uds_start_phase(partition->uds_source.left,
> image_start_phase, hscale);
--
Regards,
Laurent Pinchart
