linux-kernel - Re: [PATCH v3 020/105] drm/vc4: plane: Create overlays for any CRTC

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Message-ID: <CADaigPWzgP=C86D6zWN-z_tajFP8-F8GrQ-TcSzUt2cHcM8=8A@mail.gmail.com>
Date:   Wed, 27 May 2020 09:52:34 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v3 020/105] drm/vc4: plane: Create overlays for any CRTC

On Wed, May 27, 2020 at 8:49 AM Maxime Ripard <maxime@...no.tech> wrote:
>
> Now that we have everything in place, we can now register all the overlay
> planes that can be assigned to all the CRTCs.
>
> This has two side effects:
>
>   - The number of overlay planes is reduced from 24 to 8. This is temporary
>     and will be increased again in the next patch.
>
>   - The ID of the various planes is changed again, and we will now have all
>     the primary planes, then all the overlay planes and finally the cursor
>     planes. This shouldn't cause any issue since the ordering between
>     primary, overlay and cursor planes is preserved.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Honestly, I'd squash this with the previous two patches, the
individual refactors don't make much sense on their own or simplify
this patch I think.  Either way, patch 17-29 r-b.




> ---
>  drivers/gpu/drm/vc4/vc4_plane.c | 35 +++++++++++++++++-----------------
>  1 file changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 824c188980b0..5335123ae2a0 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -1378,26 +1378,27 @@ int vc4_plane_create_additional_planes(struct drm_device *drm)
>         struct drm_crtc *crtc;
>         unsigned int i;
>
> -       drm_for_each_crtc(crtc, drm) {
> -               /* Set up some arbitrary number of planes.  We're not limited
> -                * by a set number of physical registers, just the space in
> -                * the HVS (16k) and how small an plane can be (28 bytes).
> -                * However, each plane we set up takes up some memory, and
> -                * increases the cost of looping over planes, which atomic
> -                * modesetting does quite a bit.  As a result, we pick a
> -                * modest number of planes to expose, that should hopefully
> -                * still cover any sane usecase.
> -                */
> -               for (i = 0; i < 8; i++) {
> -                       struct drm_plane *plane =
> -                               vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
> +       /* Set up some arbitrary number of planes.  We're not limited
> +        * by a set number of physical registers, just the space in
> +        * the HVS (16k) and how small an plane can be (28 bytes).
> +        * However, each plane we set up takes up some memory, and
> +        * increases the cost of looping over planes, which atomic
> +        * modesetting does quite a bit.  As a result, we pick a
> +        * modest number of planes to expose, that should hopefully
> +        * still cover any sane usecase.
> +        */
> +       for (i = 0; i < 8; i++) {
> +               struct drm_plane *plane =
> +                       vc4_plane_init(drm, DRM_PLANE_TYPE_OVERLAY);
>
> -                       if (IS_ERR(plane))
> -                               continue;
> +               if (IS_ERR(plane))
> +                       continue;
>
> -                       plane->possible_crtcs = drm_crtc_mask(crtc);
> -               }
> +               plane->possible_crtcs =
> +                       GENMASK(drm->mode_config.num_crtc - 1, 0);
> +       }
>
> +       drm_for_each_crtc(crtc, drm) {
>                 /* Set up the legacy cursor after overlay initialization,
>                  * since we overlay planes on the CRTC in the order they were
>                  * initialized.
> --
> git-series 0.9.1