linux-kernel - [PATCH v4 22/24] drm/bridge: tc358775: Register and attach our DSI device at probe

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Message-Id: <20210910101218.1632297-23-maxime@cerno.tech>
Date:   Fri, 10 Sep 2021 12:12:16 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>
Cc:     Sean Paul <sean@...rly.run>, freedreno@...ts.freedesktop.org,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-kernel@...r.kernel.org,
        Xinliang Liu <xinliang.liu@...aro.org>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        Inki Dae <inki.dae@...sung.com>,
        linux-samsung-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...il.com>,
        dri-devel@...ts.freedesktop.org,
        John Stultz <john.stultz@...aro.org>,
        Chen Feng <puck.chen@...ilicon.com>,
        Xinwei Kong <kong.kongxinwei@...ilicon.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>
Subject: [PATCH v4 22/24] drm/bridge: tc358775: Register and attach our DSI device at probe

In order to avoid any probe ordering issue, the best practice is to move
the secondary MIPI-DSI device registration and attachment to the
MIPI-DSI host at probe time. Let's do this.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/bridge/tc358775.c | 37 +++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
index 35e66d1b6456..2c76331b251d 100644
--- a/drivers/gpu/drm/bridge/tc358775.c
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -594,11 +594,26 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
 			    enum drm_bridge_attach_flags flags)
 {
 	struct tc_data *tc = bridge_to_tc(bridge);
+
+	/* Attach the panel-bridge to the dsi bridge */
+	return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
+				 &tc->bridge, flags);
+}
+
+static const struct drm_bridge_funcs tc_bridge_funcs = {
+	.attach = tc_bridge_attach,
+	.pre_enable = tc_bridge_pre_enable,
+	.enable = tc_bridge_enable,
+	.mode_valid = tc_mode_valid,
+	.post_disable = tc_bridge_post_disable,
+};
+
+static int tc_attach_host(struct tc_data *tc)
+{
 	struct device *dev = &tc->i2c->dev;
 	struct mipi_dsi_host *host;
 	struct mipi_dsi_device *dsi;
 	int ret;
-
 	const struct mipi_dsi_device_info info = { .type = "tc358775",
 							.channel = 0,
 							.node = NULL,
@@ -628,19 +643,9 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
 		return ret;
 	}
 
-	/* Attach the panel-bridge to the dsi bridge */
-	return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
-				 &tc->bridge, flags);
+	return 0;
 }
 
-static const struct drm_bridge_funcs tc_bridge_funcs = {
-	.attach = tc_bridge_attach,
-	.pre_enable = tc_bridge_pre_enable,
-	.enable = tc_bridge_enable,
-	.mode_valid = tc_mode_valid,
-	.post_disable = tc_bridge_post_disable,
-};
-
 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
@@ -704,7 +709,15 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	i2c_set_clientdata(client, tc);
 
+	ret = tc_attach_host(tc);
+	if (ret)
+		goto err_bridge_remove;
+
 	return 0;
+
+err_bridge_remove:
+	drm_bridge_remove(&tc->bridge);
+	return ret;
 }
 
 static int tc_remove(struct i2c_client *client)
-- 
2.31.1