linux-kernel - Re: [PATCH 4/5] drm/rockchip: vop2: add support for the rgb output block

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Date:   Wed, 7 Dec 2022 07:51:31 +0100
From:   Sascha Hauer <sha@...gutronix.de>
To:     Michael Riesch <michael.riesch@...fvision.net>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Sandy Huang <hjc@...k-chips.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 4/5] drm/rockchip: vop2: add support for the rgb output
 block

On Wed, Nov 30, 2022 at 03:02:16PM +0100, Michael Riesch wrote:
> The Rockchip VOP2 features an internal RGB output block, which can be
> attached to the video port 2 of the VOP2. Add support for this output
> block.
> 
> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
> ---
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 21 ++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index 94fddbf70ff6..16041c79d228 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> @@ -39,6 +39,7 @@
>  #include "rockchip_drm_gem.h"
>  #include "rockchip_drm_fb.h"
>  #include "rockchip_drm_vop2.h"
> +#include "rockchip_rgb.h"
>  
>  /*
>   * VOP2 architecture
> @@ -212,6 +213,9 @@ struct vop2 {
>  	struct clk *hclk;
>  	struct clk *aclk;
>  
> +	/* optional internal rgb encoder */
> +	struct rockchip_rgb *rgb;
> +
>  	/* must be put at the end of the struct */
>  	struct vop2_win win[];
>  };
> @@ -2697,11 +2701,25 @@ static int vop2_bind(struct device *dev, struct device *master, void *data)
>  	if (ret)
>  		return ret;
>  
> +	vop2->rgb = rockchip_rgb_init(dev, &vop2->vps[2].crtc, vop2->drm, 2);

Here you assume that the RGB output can only be connected to VP2, but it
could be connected to any other VP as well, and we can find the
description where it actually shall be connected in the device tree.

As mentioned in my comment to patch 1, the question is "Is there
something connected to VPx at endpoint ROCKCHIP_VOP2_EP_RGB0?"

Sascha

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