linux-kernel - [PATCH v4 14/24] drm/bridge: lt9611uxc: Register and attach our DSI device at probe

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Date:   Fri, 10 Sep 2021 12:12:08 +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 14/24] drm/bridge: lt9611uxc: 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/lontium-lt9611uxc.c | 31 +++++++++++++---------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index e5083bdf4c89..78c4175e0a12 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -364,18 +364,6 @@ static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
 			return ret;
 	}
 
-	/* Attach primary DSI */
-	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
-	if (IS_ERR(lt9611uxc->dsi0))
-		return PTR_ERR(lt9611uxc->dsi0);
-
-	/* Attach secondary DSI, if specified */
-	if (lt9611uxc->dsi1_node) {
-		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
-		if (IS_ERR(lt9611uxc->dsi1))
-			return PTR_ERR(lt9611uxc->dsi1);
-	}
-
 	return 0;
 }
 
@@ -955,8 +943,27 @@ static int lt9611uxc_probe(struct i2c_client *client,
 
 	drm_bridge_add(&lt9611uxc->bridge);
 
+	/* Attach primary DSI */
+	lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi0_node);
+	if (IS_ERR(lt9611uxc->dsi0)) {
+		ret = PTR_ERR(lt9611uxc->dsi0);
+		goto err_remove_bridge;
+	}
+
+	/* Attach secondary DSI, if specified */
+	if (lt9611uxc->dsi1_node) {
+		lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, lt9611uxc->dsi1_node);
+		if (IS_ERR(lt9611uxc->dsi1)) {
+			ret = PTR_ERR(lt9611uxc->dsi1);
+			goto err_remove_bridge;
+		}
+	}
+
 	return lt9611uxc_audio_init(dev, lt9611uxc);
 
+err_remove_bridge:
+	drm_bridge_remove(&lt9611uxc->bridge);
+
 err_disable_regulators:
 	regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), lt9611uxc->supplies);
 
-- 
2.31.1