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

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Message-ID: <CAPj87rPHFCntSOCx=92HitNxRBkXx3xSft0krkFLzdM2FrDSRw@mail.gmail.com>
Date:   Tue, 25 Feb 2020 07:29:44 +0000
From:   Daniel Stone <daniel@...ishbar.org>
To:     Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        tzimmermann@...e.de, Maxime Ripard <mripard@...nel.org>,
        mihail.atanassov@....com,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        José Roberto de Souza <jose.souza@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Uma Shankar <uma.shankar@...el.com>,
        "Nautiyal, Ankit K" <ankit.k.nautiyal@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] [RFC][PATCH 5/5] drm/i915/display: Add
 Nearest-neighbor based integer scaling support

Hi,

On Tue, 25 Feb 2020 at 07:17, Pankaj Bharadiya
<pankaj.laxminarayan.bharadiya@...el.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