linux-kernel - Re: [PATCH 06/30] drm/bridge/ti-sn65dsi86: (Un)register aux device on bridge attach/detach

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Message-ID: <YDKiZ0LYPWq0dsFt@pendragon.ideasonboard.com>
Date:   Sun, 21 Feb 2021 20:11:51 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Lyude Paul <lyude@...hat.com>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/30] drm/bridge/ti-sn65dsi86: (Un)register aux device
 on bridge attach/detach

Hi Lyude,

Thank you for the patch.

On Fri, Feb 19, 2021 at 04:53:02PM -0500, Lyude Paul wrote:
> Since we're about to add a back-pointer to drm_dev in drm_dp_aux, let's
> move the AUX adapter registration to the first point where we know which
> DRM device we'll be working with - when the drm_bridge is attached.
> Likewise, we unregister the AUX adapter on bridge detachment by adding a
> ti_sn_bridge_detach() callback.
> 
> Signed-off-by: Lyude Paul <lyude@...hat.com>

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

> ---
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index f27306c51e4d..88df4dd0f39d 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -362,12 +362,18 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
>  		return -EINVAL;
>  	}
>  
> +	ret = drm_dp_aux_register(&pdata->aux);
> +	if (ret < 0) {
> +		drm_err(bridge->dev, "Failed to register DP AUX channel: %d\n", ret);
> +		return ret;
> +	}
> +
>  	ret = drm_connector_init(bridge->dev, &pdata->connector,
>  				 &ti_sn_bridge_connector_funcs,
>  				 DRM_MODE_CONNECTOR_eDP);
>  	if (ret) {
>  		DRM_ERROR("Failed to initialize connector with drm\n");
> -		return ret;
> +		goto err_conn_init;
>  	}
>  
>  	drm_connector_helper_add(&pdata->connector,
> @@ -424,9 +430,16 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
>  	mipi_dsi_device_unregister(dsi);
>  err_dsi_host:
>  	drm_connector_cleanup(&pdata->connector);
> +err_conn_init:
> +	drm_dp_aux_unregister(&pdata->aux);
>  	return ret;
>  }
>  
> +static void ti_sn_bridge_detach(struct drm_bridge *bridge)
> +{
> +	drm_dp_aux_unregister(&bridge_to_ti_sn_bridge(bridge)->aux);
> +}
> +
>  static void ti_sn_bridge_disable(struct drm_bridge *bridge)
>  {
>  	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
> @@ -863,6 +876,7 @@ static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
>  
>  static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
>  	.attach = ti_sn_bridge_attach,
> +	.detach = ti_sn_bridge_detach,
>  	.pre_enable = ti_sn_bridge_pre_enable,
>  	.enable = ti_sn_bridge_enable,
>  	.disable = ti_sn_bridge_disable,
> @@ -1287,7 +1301,7 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
>  	pdata->aux.name = "ti-sn65dsi86-aux";
>  	pdata->aux.dev = pdata->dev;
>  	pdata->aux.transfer = ti_sn_aux_transfer;
> -	drm_dp_aux_register(&pdata->aux);
> +	drm_dp_aux_init(&pdata->aux);
>  
>  	pdata->bridge.funcs = &ti_sn_bridge_funcs;
>  	pdata->bridge.of_node = client->dev.of_node;

-- 
Regards,

Laurent Pinchart