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Date:   Thu, 19 Jan 2023 16:17:34 +0100
From:   Sascha Hauer <sha@pengutronix.de>
To:     Michael Riesch <michael.riesch@wolfvision.net>
Cc:     devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Sandy Huang <hjc@rock-chips.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH v2 5/6] drm/rockchip: vop2: add support for the rgb
 output block
Message-ID: <20230119151734.GH24755@pengutronix.de>
References: <20230119143911.3793654-1-michael.riesch@wolfvision.net>
 <20230119143911.3793654-6-michael.riesch@wolfvision.net>
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In-Reply-To: <20230119143911.3793654-6-michael.riesch@wolfvision.net>
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Hi Michael,

On Thu, Jan 19, 2023 at 03:39:10PM +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@wolfvision.net>
> ---
> v2:
>  - move away from wrong assumption that the RGB block is always
>    connected to video port 2 -> check devicetree to find RGB block

Traces of that assumption are still in the commmit message.

> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 44 ++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> +static int vop2_find_rgb_encoder(struct vop2 *vop2)
> +{
> +	struct device_node *node = vop2->dev->of_node;
> +	struct device_node *endpoint;
> +	int i;
> +
> +	for (i = 0; i < vop2->data->nr_vps; i++) {
> +		endpoint = of_graph_get_endpoint_by_regs(node, i,
> +							 ROCKCHIP_VOP2_EP_RGB0);
> +		if (!endpoint)
> +			continue;
> +
> +		of_node_put(endpoint);
> +		return i;
> +	}
> +
> +	return -ENOENT;
> +}
> +
>  static struct reg_field vop2_cluster_regs[VOP2_WIN_MAX_REG] = {
>  	[VOP2_WIN_ENABLE] = REG_FIELD(RK3568_CLUSTER_WIN_CTRL0, 0, 0),
>  	[VOP2_WIN_FORMAT] = REG_FIELD(RK3568_CLUSTER_WIN_CTRL0, 1, 5),
> @@ -2698,11 +2721,29 @@ static int vop2_bind(struct device *dev, struct device *master, void *data)
>  	if (ret)
>  		return ret;
>  
> +	ret = vop2_find_rgb_encoder(vop2);
> +	if (ret > 0) {

'0' seems to be a valid vp as well. Shouldn't this be ret >= 0?

> +		vop2->rgb = rockchip_rgb_init(dev, &vop2->vps[ret].crtc,
> +					      vop2->drm, ret);
> +		if (IS_ERR(vop2->rgb)) {
> +			if (PTR_ERR(vop2->rgb) == -EPROBE_DEFER) {
> +				ret = PTR_ERR(vop2->rgb);
> +				goto err_crtcs;
> +			}
> +			vop2->rgb = NULL;
> +		}
> +	}
> +

Sascha

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