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

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Message-Id: <20210219215326.2227596-7-lyude@redhat.com>
Date:   Fri, 19 Feb 2021 16:53:02 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     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>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 06/30] drm/bridge/ti-sn65dsi86: (Un)register aux device on bridge attach/detach

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>
---
 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;
-- 
2.29.2