linux-kernel - [PATCH v4 18/24] drm/bridge: sn65dsi83: Register and attach our DSI device at probe

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Date:   Fri, 10 Sep 2021 12:12:12 +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 18/24] drm/bridge: sn65dsi83: 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/ti-sn65dsi83.c | 80 +++++++++++++++------------
 1 file changed, 46 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index db4d39082705..f951eb19767b 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -245,40 +245,6 @@ static int sn65dsi83_attach(struct drm_bridge *bridge,
 			    enum drm_bridge_attach_flags flags)
 {
 	struct sn65dsi83 *ctx = bridge_to_sn65dsi83(bridge);
-	struct device *dev = ctx->dev;
-	struct mipi_dsi_device *dsi;
-	struct mipi_dsi_host *host;
-	int ret = 0;
-
-	const struct mipi_dsi_device_info info = {
-		.type = "sn65dsi83",
-		.channel = 0,
-		.node = NULL,
-	};
-
-	host = of_find_mipi_dsi_host_by_node(ctx->host_node);
-	if (!host) {
-		dev_err(dev, "failed to find dsi host\n");
-		return -EPROBE_DEFER;
-	}
-
-	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
-	if (IS_ERR(dsi)) {
-		return dev_err_probe(dev, PTR_ERR(dsi),
-				     "failed to create dsi device\n");
-	}
-
-	ctx->dsi = dsi;
-
-	dsi->lanes = ctx->dsi_lanes;
-	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
-
-	ret = devm_mipi_dsi_attach(dev, dsi);
-	if (ret < 0) {
-		dev_err(dev, "failed to attach dsi to host\n");
-		return ret;
-	}
 
 	return drm_bridge_attach(bridge->encoder, ctx->panel_bridge,
 				 &ctx->bridge, flags);
@@ -646,6 +612,44 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
 	return 0;
 }
 
+static int sn65dsi83_host_attach(struct sn65dsi83 *ctx)
+{
+	struct device *dev = ctx->dev;
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	const struct mipi_dsi_device_info info = {
+		.type = "sn65dsi83",
+		.channel = 0,
+		.node = NULL,
+	};
+	int ret;
+
+	host = of_find_mipi_dsi_host_by_node(ctx->host_node);
+	if (!host) {
+		dev_err(dev, "failed to find dsi host\n");
+		return -EPROBE_DEFER;
+	}
+
+	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+	if (IS_ERR(dsi))
+		return dev_err_probe(dev, PTR_ERR(dsi),
+				     "failed to create dsi device\n");
+
+	ctx->dsi = dsi;
+
+	dsi->lanes = ctx->dsi_lanes;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+
+	ret = devm_mipi_dsi_attach(dev, dsi);
+	if (ret < 0) {
+		dev_err(dev, "failed to attach dsi to host: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static int sn65dsi83_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
@@ -686,7 +690,15 @@ static int sn65dsi83_probe(struct i2c_client *client,
 	ctx->bridge.of_node = dev->of_node;
 	drm_bridge_add(&ctx->bridge);
 
+	ret = sn65dsi83_host_attach(ctx);
+	if (ret)
+		goto err_remove_bridge;
+
 	return 0;
+
+err_remove_bridge:
+	drm_bridge_remove(&ctx->bridge);
+	return ret;
 }
 
 static int sn65dsi83_remove(struct i2c_client *client)
-- 
2.31.1