[Intel-gfx] [RFC][PATCH 5/5] drm/i915/display: Add Nearest-neighbor based integer scaling support

[Daniel Stone]

Hi,

On Tue, 25 Feb 2020 at 07:17, Pankaj Bharadiya
<pankaj.laxminarayan.bharadiya at intel.com> wrote:
> @@ -415,18 +415,26 @@ skl_program_scaler(struct intel_plane *plane,
>         u16 y_vphase, uv_rgb_vphase;
>         int hscale, vscale;
>         const struct drm_plane_state *state = &plane_state->uapi;
> +       u32 src_w = drm_rect_width(&plane_state->uapi.src) >> 16;
> +       u32 src_h = drm_rect_height(&plane_state->uapi.src) >> 16;
>         u32 scaling_filter = PS_FILTER_MEDIUM;
> +       struct drm_rect dst;
>
>         if (state->scaling_filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR) {
>                 scaling_filter = PS_FILTER_PROGRAMMED;
> +               skl_setup_nearest_neighbor_filter(dev_priv, pipe, scaler_id);
> +
> +               /* Make the scaling window size to integer multiple of source
> +                * TODO: Should userspace take desision to round scaling window
> +                * to integer multiple?
> +                */
> +               crtc_w = rounddown(crtc_w, src_w);
> +               crtc_h = rounddown(crtc_h, src_h);

The kernel should absolutely not be changing the co-ordinates that
userspace requested.

Cheers,
Daniel