linux-kernel - Re: [PATCH 1/5] drm/rockchip: rgb: embed drm_encoder into rockchip

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Message-ID: <20221207064507.GV29728@pengutronix.de>
Date:   Wed, 7 Dec 2022 07:45:07 +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 1/5] drm/rockchip: rgb: embed drm_encoder into
 rockchip_encoder

On Wed, Nov 30, 2022 at 03:02:13PM +0100, Michael Riesch wrote:
> Commit 540b8f271e53 ("drm/rockchip: Embed drm_encoder into
> rockchip_decoder") provides the means to pass the endpoint ID to the
> VOP2 driver, which sets the interface MUX accordingly. However, this
> step has not yet been carried out for the RGB output block. Embed the
> drm_encoder structure into the rockchip_encoder structure and set the
> endpoint ID correctly.
> 
> Signed-off-by: Michael Riesch <michael.riesch@...fvision.net>
> ---
>  drivers/gpu/drm/rockchip/rockchip_rgb.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_rgb.c b/drivers/gpu/drm/rockchip/rockchip_rgb.c
> index 75eb7cca3d82..16201a5cf1e8 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_rgb.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_rgb.c
> @@ -18,17 +18,17 @@
>  #include <drm/drm_probe_helper.h>
>  #include <drm/drm_simple_kms_helper.h>
>  
> +#include <dt-bindings/soc/rockchip,vop2.h>
> +
>  #include "rockchip_drm_drv.h"
>  #include "rockchip_drm_vop.h"
>  #include "rockchip_rgb.h"
>  
> -#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
> -
>  struct rockchip_rgb {
>  	struct device *dev;
>  	struct drm_device *drm_dev;
>  	struct drm_bridge *bridge;
> -	struct drm_encoder encoder;
> +	struct rockchip_encoder encoder;
>  	struct drm_connector connector;
>  	int output_mode;
>  };
> @@ -125,7 +125,7 @@ struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
>  		return ERR_PTR(ret);
>  	}
>  
> -	encoder = &rgb->encoder;
> +	encoder = &rgb->encoder.encoder;
>  	encoder->possible_crtcs = drm_crtc_mask(crtc);
>  
>  	ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
> @@ -161,6 +161,8 @@ struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
>  		goto err_free_encoder;
>  	}
>  
> +	rgb->encoder.crtc_endpoint_id = ROCKCHIP_VOP2_EP_RGB0;

This is vop2 specific. This code is used with the vop1 as well, so it
doesn't look like it belongs here, at least not hidden in a patch titled
"embed drm_encoder into rockchip_encoder".

Normally the crtc_endpoint_id is set by the encoder, coming from the
encoder node, asking the question "To which port on the VOP am I
connected to?"

Here the situation is different. We are called from the VOP and the
question instead is: "Is there something connected to VPx endpoint id
ROCKCHIP_VOP2_EP_RGB0?"

You might need a vop2 specific entry to this code.

Sascha

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