[PATCH v3 1/1] drm/mediatek: Fix cursor plane didn't update

[Sean Paul]

On Tue, Jul 20, 2021 at 3:47 AM jason-jh.lin <jason-jh.lin at mediatek.com> wrote:
>
> The cursor plane should use the current plane state hook in
> atomic_async_update because it would not be the new plane state in
> the global atomic state, since drm_atomic_helper_swap_state happened
> when those plane state hook are run.
>
> Fix cursor plane didn't update issue by below modification:
> 1. Remove plane_helper_funcs->atomic_update(plane, state) in
>    mtk_drm_crtc_async_update.
> 2. Add mtk_drm_update_new_state into mtk_plane_atomic_async_update to
>    update the cursor plane by current plane state hook and add it into
>    mtk_plane_atomic_update to update others plane by the new_state.
>
> Fixes: 37418bf14c13 ("drm: Use state helper instead of the plane state pointer")
> Signed-off-by: jason-jh.lin <jason-jh.lin at mediatek.com>
> Tested-by: Enric Balletbo i Serra <enric.balletbo at collabora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c  |  1 -
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c | 60 ++++++++++++++----------
>  2 files changed, 34 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 474efb844249..063c75bab3a8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -538,7 +538,6 @@ void mtk_drm_crtc_async_update(struct drm_crtc *crtc, struct drm_plane *plane,
>         if (!mtk_crtc->enabled)
>                 return;
>
> -       plane_helper_funcs->atomic_update(plane, state);

plane_helper_funcs is now unused

../drivers/gpu/drm/mediatek/mtk_drm_crtc.c:578:39: warning: unused
variable ‘plane_helper_funcs’ [-Wunused-variable]

>
>         mtk_drm_crtc_update_config(mtk_crtc, false);
>  }
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index b5582dcf564c..e6dcb34d3052 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -110,6 +110,35 @@ static int mtk_plane_atomic_async_check(struct drm_plane *plane,
>                                                    true, true);
>  }
>
> +static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
> +                                      struct mtk_plane_state *mtk_plane_state)
> +{
> +       struct drm_framebuffer *fb = new_state->fb;
> +       struct drm_gem_object *gem;
> +       struct mtk_drm_gem_obj *mtk_gem;
> +       unsigned int pitch, format;
> +       dma_addr_t addr;
> +
> +       gem = fb->obj[0];
> +       mtk_gem = to_mtk_gem_obj(gem);
> +       addr = mtk_gem->dma_addr;
> +       pitch = fb->pitches[0];
> +       format = fb->format->format;
> +
> +       addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];
> +       addr += (new_state->src.y1 >> 16) * pitch;
> +
> +       mtk_plane_state->pending.enable = true;
> +       mtk_plane_state->pending.pitch = pitch;
> +       mtk_plane_state->pending.format = format;
> +       mtk_plane_state->pending.addr = addr;
> +       mtk_plane_state->pending.x = new_state->dst.x1;
> +       mtk_plane_state->pending.y = new_state->dst.y1;
> +       mtk_plane_state->pending.width = drm_rect_width(&new_state->dst);
> +       mtk_plane_state->pending.height = drm_rect_height(&new_state->dst);
> +       mtk_plane_state->pending.rotation = new_state->rotation;
> +}
> +
>  static void mtk_plane_atomic_async_update(struct drm_plane *plane,
>                                           struct drm_atomic_state *state)
>  {
> @@ -126,8 +155,10 @@ static void mtk_plane_atomic_async_update(struct drm_plane *plane,
>         plane->state->src_h = new_state->src_h;
>         plane->state->src_w = new_state->src_w;
>         swap(plane->state->fb, new_state->fb);
> -       new_plane_state->pending.async_dirty = true;
>
> +       mtk_plane_update_new_state(new_state, new_plane_state);
> +       wmb(); /* Make sure the above parameters are set before update */
> +       new_plane_state->pending.async_dirty = true;
>         mtk_drm_crtc_async_update(new_state->crtc, plane, state);
>  }
>
> @@ -189,14 +220,8 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
>         struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
>                                                                            plane);
>         struct mtk_plane_state *mtk_plane_state = to_mtk_plane_state(new_state);
> -       struct drm_crtc *crtc = new_state->crtc;
> -       struct drm_framebuffer *fb = new_state->fb;
> -       struct drm_gem_object *gem;
> -       struct mtk_drm_gem_obj *mtk_gem;
> -       unsigned int pitch, format;
> -       dma_addr_t addr;
>
> -       if (!crtc || WARN_ON(!fb))
> +       if (!new_state->crtc || WARN_ON(!new_state->fb))
>                 return;
>
>         if (!new_state->visible) {
> @@ -204,24 +229,7 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
>                 return;
>         }
>
> -       gem = fb->obj[0];
> -       mtk_gem = to_mtk_gem_obj(gem);
> -       addr = mtk_gem->dma_addr;
> -       pitch = fb->pitches[0];
> -       format = fb->format->format;
> -
> -       addr += (new_state->src.x1 >> 16) * fb->format->cpp[0];
> -       addr += (new_state->src.y1 >> 16) * pitch;
> -
> -       mtk_plane_state->pending.enable = true;
> -       mtk_plane_state->pending.pitch = pitch;
> -       mtk_plane_state->pending.format = format;
> -       mtk_plane_state->pending.addr = addr;
> -       mtk_plane_state->pending.x = new_state->dst.x1;
> -       mtk_plane_state->pending.y = new_state->dst.y1;
> -       mtk_plane_state->pending.width = drm_rect_width(&new_state->dst);
> -       mtk_plane_state->pending.height = drm_rect_height(&new_state->dst);
> -       mtk_plane_state->pending.rotation = new_state->rotation;
> +       mtk_plane_update_new_state(new_state, mtk_plane_state);
>         wmb(); /* Make sure the above parameters are set before update */
>         mtk_plane_state->pending.dirty = true;
>  }
> --
> 2.18.0
>