linux-kernel - Re: [PATCH v3 5/6] drm/rockchip: vop2: add support for the rgb output block

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Message-ID: <55af4c7a-b56f-73ae-3bab-537785d5d218@wolfvision.net>
Date:   Fri, 27 Jan 2023 10:53:26 +0100
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     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
Cc:     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>,
        Sascha Hauer <sha@...gutronix.de>
Subject: Re: [PATCH v3 5/6] drm/rockchip: vop2: add support for the rgb output
 block

On 1/24/23 06:47, Michael Riesch wrote:
> The Rockchip VOP2 features an internal RGB output block, which can be
> attached any video port of the VOP2. Add support for this output block.

s/attached any/attached to any/ of course. Can this be fixed when the
patch is applied?

Michael

> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
> ---
> v3:
>  - fix commit messages (still assumed video port 2)
>  - fix condition to make 0 a valid video port
> v2:
>  - move away from wrong assumption that the RGB block is always
>    connected to video port 2 -> check devicetree to find RGB block
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 44 ++++++++++++++++++++
>  1 file changed, 44 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
> index 06fcdfa7b885..f38ffd0ccd9f 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[];
>  };
> @@ -2393,6 +2397,25 @@ static void vop2_destroy_crtcs(struct vop2 *vop2)
>  	}
>  }
>  
> +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) {
> +		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;
> +		}
> +	}
> +
>  	rockchip_drm_dma_init_device(vop2->drm, vop2->dev);
>  
>  	pm_runtime_enable(&pdev->dev);
>  
>  	return 0;
> +
> +err_crtcs:
> +	vop2_destroy_crtcs(vop2);
> +
> +	return ret;
>  }
>  
>  static void vop2_unbind(struct device *dev, struct device *master, void *data)
> @@ -2711,6 +2752,9 @@ static void vop2_unbind(struct device *dev, struct device *master, void *data)
>  
>  	pm_runtime_disable(dev);
>  
> +	if (vop2->rgb)
> +		rockchip_rgb_fini(vop2->rgb);
> +
>  	vop2_destroy_crtcs(vop2);
>  }
>