linux-kernel - Re: [PATCH 05/39] drm: renesas: shmobile: Correct encoder/connector types

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Message-ID: <20230623150346.GH2112@pendragon.ideasonboard.com>
Date:   Fri, 23 Jun 2023 18:03:46 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Magnus Damm <magnus.damm@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/39] drm: renesas: shmobile: Correct encoder/connector
 types

Hi Geert,

Thank you for the patch.

On Thu, Jun 22, 2023 at 11:21:17AM +0200, Geert Uytterhoeven wrote:
> The first encoder output on the SH-Mobile LCD Controller is a DPI
> parallel bus.  However, at the time of introduction of the driver, no
> encoder or connector types were defined yet for the DPI parallel bus,
> hence the driver used the ones for LVDS instead.
> 
> Adjust the types accordingly.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
>  drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
> index 11dd2bc803e7cb62..fbfd906844da490c 100644
> --- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
> +++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c
> @@ -598,7 +598,7 @@ int shmob_drm_encoder_create(struct shmob_drm_device *sdev)
>  	encoder->possible_crtcs = 1;
>  
>  	ret = drm_simple_encoder_init(sdev->ddev, encoder,
> -				      DRM_MODE_ENCODER_LVDS);
> +				      DRM_MODE_ENCODER_DPI);

You can use DRM_MODE_ENCODER_NONE, that will simplify the code when
adding support for additional outputs. The encoder type was exposed to
userspace by mistake, and AFAIU is unused by userspace, so it doesn't
need to be specified.

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>

>  	if (ret < 0)
>  		return ret;
>  
> @@ -684,7 +684,7 @@ int shmob_drm_connector_create(struct shmob_drm_device *sdev,
>  	connector->display_info.height_mm = sdev->pdata->panel.height_mm;
>  
>  	ret = drm_connector_init(sdev->ddev, connector, &connector_funcs,
> -				 DRM_MODE_CONNECTOR_LVDS);
> +				 DRM_MODE_CONNECTOR_DPI);
>  	if (ret < 0)
>  		return ret;
>  

-- 
Regards,

Laurent Pinchart