linux-kernel - Re: [PATCH 1/2] drm/ingenic: Switch IPU plane to type OVERLAY

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Message-ID: <BH3N8QICMyp64pmUQyXLwYMnCNBvXxThwvKJIOmyMU0XIgTtorcGd7s7AjnIFXQrLGEoJMuvPcWTiv38syiYOTCDv-bSxswFBX6y3UYqTwE=@emersion.fr>
Date:   Tue, 30 Mar 2021 07:23:12 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Sam Ravnborg <sam@...nborg.org>, od@...c.me,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/ingenic: Switch IPU plane to type OVERLAY

> It should have been an OVERLAY from the beginning. The documentation
> stipulates that there should be an unique PRIMARY plane per CRTC.

Thanks for the quick patch! One comment below…

> Fixes: fc1acf317b01 ("drm/ingenic: Add support for the IPU")
> Cc: <stable@...r.kernel.org> # 5.8+
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 11 +++++------
>  drivers/gpu/drm/ingenic/ingenic-ipu.c     |  2 +-
>  2 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index 29742ec5ab95..09225b770bb8 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -419,7 +419,7 @@ static void ingenic_drm_plane_enable(struct ingenic_drm *priv,
>  	unsigned int en_bit;
>
>  	if (priv->soc_info->has_osd) {
> -		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> +		if (plane != &priv->f0)

I don't know about this driver but… is this really the same as the previous
condition? The previous condition would match two planes, this one seems to
match only a single plane. What am I missing?