Re: [PATCH v3 4/5] media: vsp1: Split out pre-filter multiplier

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Hi Kieran,

Thank you for the patch.

On Thu, Apr 11, 2019 at 05:12:55PM +0100, Kieran Bingham wrote:
> The 'mp' value is used through many calculations in determining the scaling
> factors of the UDS. Factor this out so that it can be reused in further
> calculations, and also ensure that if the BLADV control is ever changed only a
> single function needs to be modified.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/platform/vsp1/vsp1_uds.c | 22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c
> index 27012af973b2..c71c24363d54 100644
> --- a/drivers/media/platform/vsp1/vsp1_uds.c
> +++ b/drivers/media/platform/vsp1/vsp1_uds.c
> @@ -46,6 +46,18 @@ void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,
>  		       alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
>  }
>  
> +/*
> + * Determine the pre-filter multiplication value.

This would benefit from a more detailed description, and in particular a
definition of what "pre-filter" means.

> + *
> + * This calculation assumes that the BLADV control is unset.

s/control/bit/ ?
s/unset/not set/ ?

> + */
> +static unsigned int uds_multiplier(int ratio)

Should the function be renamed to uds_pre_multiplier() ? And isn't it a
divisor ? :-)

> +{
> +	unsigned int mp = ratio / 4096;
> +
> +	return mp < 4 ? 1 : (mp < 8 ? 2 : 4);
> +}
> +
>  /*
>   * uds_output_size - Return the output size for an input size and scaling ratio
>   * @input: input size in pixels
> @@ -55,10 +67,7 @@ static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
>  {
>  	if (ratio > 4096) {
>  		/* Down-scaling */
> -		unsigned int mp;
> -
> -		mp = ratio / 4096;
> -		mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
> +		unsigned int mp = uds_multiplier(ratio);
>  
>  		return (input - 1) / mp * mp * 4096 / ratio + 1;
>  	} else {
> @@ -88,10 +97,7 @@ static unsigned int uds_passband_width(unsigned int ratio)
>  {
>  	if (ratio >= 4096) {
>  		/* Down-scaling */
> -		unsigned int mp;
> -
> -		mp = ratio / 4096;
> -		mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
> +		unsigned int mp = uds_multiplier(ratio);
>  
>  		return 64 * 4096 * mp / ratio;
>  	} else {

-- 
Regards,

Laurent Pinchart



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