linux-kernel - Re: [PATCH 06/11] drm/meson: Add G12A Support for the Overlay video plane

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Message-ID: <824430c056a151003d82755a00a06263be1d877e.camel@baylibre.com>
Date:   Tue, 09 Apr 2019 10:42:57 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Cc:     linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/11] drm/meson: Add G12A Support for the Overlay video
 plane

On Mon, 2019-03-25 at 15:18 +0100, Neil Armstrong wrote:
> Amlogic G12A SoC supports the same set of Video Planes, but now
> are handled by the new OSD plane blender module.
> 
> This patch uses the same VD1 plane for G12A, using the exact same scaler
> and VD11 setup registers, except using the new blender register to
> disable the plane.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/gpu/drm/meson/meson_overlay.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_overlay.c b/drivers/gpu/drm/meson/meson_overlay.c
> index b54a22e483b9..bdbf925ff3e8 100644
> --- a/drivers/gpu/drm/meson/meson_overlay.c
> +++ b/drivers/gpu/drm/meson/meson_overlay.c
> @@ -516,8 +516,14 @@ static void meson_overlay_atomic_disable(struct drm_plane *plane,
>  	priv->viu.vd1_enabled = false;
>  
>  	/* Disable VD1 */
> -	writel_bits_relaxed(VPP_VD1_POSTBLEND | VPP_VD1_PREBLEND, 0,
> -			    priv->io_base + _REG(VPP_MISC));
> +	if (meson_vpu_is_compatible(priv, "amlogic,meson-g12a-vpu")) {
> +		writel_relaxed(0, priv->io_base + _REG(VD1_BLEND_SRC_CTRL));
> +		writel_relaxed(0, priv->io_base + _REG(VD2_BLEND_SRC_CTRL));
> +		writel_relaxed(0, priv->io_base + _REG(VD1_IF0_GEN_REG + 0x17b0));
> +		writel_relaxed(0, priv->io_base + _REG(VD2_IF0_GEN_REG + 0x17b0));

Is it possible to add a comment explaining this 0x17b0 value ?

> +	} else
> +		writel_bits_relaxed(VPP_VD1_POSTBLEND | VPP_VD1_PREBLEND, 0,
> +				    priv->io_base + _REG(VPP_MISC));
>  
>  }
>