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.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025151536.1048186-16-maxime@cerno.tech

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 539edd2..945f08d 100644 (file)
--- 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);
@@ -636,6 +602,44 @@ 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)
 {
@@ -679,7 +683,15 @@ 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)