linux-kernel - Re: [PATCH v3 4/4] drm/ingenic: Fix non-OSD mode

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Message-ID: <YFqknayQuJQmG7lm@pendragon.ideasonboard.com>
Date:   Wed, 24 Mar 2021 04:31:57 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, od@...c.me, stable@...r.kernel.org,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v3 4/4] drm/ingenic: Fix non-OSD mode

Hi Paul,

Thank you for the patch.

On Sun, Jan 24, 2021 at 08:55:52AM +0000, Paul Cercueil 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>
> Acked-by: Daniel Vetter <daniel.vetter@...ll.ch>

I don't have much knowledge about this platform, but the change looks
reasonable to me.

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  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 b23011c1c5d9..59ce43862e16 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);

-- 
Regards,

Laurent Pinchart