linux-kernel - Re: [PATCH v2 3/3] drm/ingenic: Fix non-OSD mode

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Date:   Wed, 20 Jan 2021 17:26:02 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        od@...c.me, dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] drm/ingenic: Fix non-OSD mode

On Wed, Jan 20, 2021 at 1:36 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Even though the JZ4740 did not have the OSD mode, it had (according to
> the documentation) two DMA channels, but there is absolutely no
> information about how to select the second DMA channel.
>
> Make the ingenic-drm driver work in non-OSD mode by using the
> foreground0 plane (which is bound to the DMA0 channel) as the primary
> plane, instead of the foreground1 plane, which is the primary plane
> when in OSD mode.
>
> Fixes: 3c9bea4ef32b ("drm/ingenic: Add support for OSD mode")
> Cc: <stable@...r.kernel.org> # v5.8+
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

Does what it says on the tin^Wcommit message.

Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>
> ---
>  drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index 158433b4c084..963dcbfeaba2 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -554,7 +554,7 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
>                 height = state->src_h >> 16;
>                 cpp = state->fb->format->cpp[0];
>
> -               if (priv->soc_info->has_osd && plane->type == DRM_PLANE_TYPE_OVERLAY)
> +               if (!priv->soc_info->has_osd || plane->type == DRM_PLANE_TYPE_OVERLAY)
>                         hwdesc = &priv->dma_hwdescs->hwdesc_f0;
>                 else
>                         hwdesc = &priv->dma_hwdescs->hwdesc_f1;
> @@ -826,6 +826,7 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
>         const struct jz_soc_info *soc_info;
>         struct ingenic_drm *priv;
>         struct clk *parent_clk;
> +       struct drm_plane *primary;
>         struct drm_bridge *bridge;
>         struct drm_panel *panel;
>         struct drm_encoder *encoder;
> @@ -940,9 +941,11 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
>         if (soc_info->has_osd)
>                 priv->ipu_plane = drm_plane_from_index(drm, 0);
>
> -       drm_plane_helper_add(&priv->f1, &ingenic_drm_plane_helper_funcs);
> +       primary = priv->soc_info->has_osd ? &priv->f1 : &priv->f0;
>
> -       ret = drm_universal_plane_init(drm, &priv->f1, 1,
> +       drm_plane_helper_add(primary, &ingenic_drm_plane_helper_funcs);
> +
> +       ret = drm_universal_plane_init(drm, primary, 1,
>                                        &ingenic_drm_primary_plane_funcs,
>                                        priv->soc_info->formats_f1,
>                                        priv->soc_info->num_formats_f1,
> @@ -954,7 +957,7 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
>
>         drm_crtc_helper_add(&priv->crtc, &ingenic_drm_crtc_helper_funcs);
>
> -       ret = drm_crtc_init_with_planes(drm, &priv->crtc, &priv->f1,
> +       ret = drm_crtc_init_with_planes(drm, &priv->crtc, primary,
>                                         NULL, &ingenic_drm_crtc_funcs, NULL);
>         if (ret) {
>                 dev_err(dev, "Failed to init CRTC: %i\n", ret);
> --
> 2.29.2
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch