drm/bridge: adv7511: Attach to DSI host at probe time

In contrast to all of the DSI panel drivers in drivers/gpu/drm/panel
which attach to the DSI host via mipi_dsi_attach() at probe time, the
ADV7533 bridge device does not. Instead it defers this to the point that
the upstream device connects to its bridge via drm_bridge_attach().
The generic Synopsys MIPI DSI host driver does not register it's own
drm_bridge until the MIPI DSI has attached. But it does not call
drm_bridge_attach() on the downstream device until the upstream device
has attached. This leads to a chicken and the egg failure and the DRM
pipeline does not complete.
Since all other mipi_dsi_device drivers call mipi_dsi_attach() in
probe(), make the adv7533 mipi_dsi_device do the same. This ensures that
the Synopsys MIPI DSI host registers it's bridge such that it is
available for the upstream device to connect to.

Signed-off-by: Matt Redfearn <matt.redfearn@thinci.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190627151740.2277-1-matt.redfearn@thinci.com

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index f6d2681..98bccac 100644 (file)
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -874,9 +874,6 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge)
                                 &adv7511_connector_helper_funcs);
        drm_connector_attach_encoder(&adv->connector, bridge->encoder);
 
-       if (adv->type == ADV7533)
-               ret = adv7533_attach_dsi(adv);
-
        if (adv->i2c_main->irq)
                regmap_write(adv->regmap, ADV7511_REG_INT_ENABLE(0),
                             ADV7511_INT0_HPD);
@@ -1222,8 +1219,17 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
        drm_bridge_add(&adv7511->bridge);
 
        adv7511_audio_init(dev, adv7511);
+
+       if (adv7511->type == ADV7533) {
+               ret = adv7533_attach_dsi(adv7511);
+               if (ret)
+                       goto err_remove_bridge;
+       }
+
        return 0;
 
+err_remove_bridge:
+       drm_bridge_remove(&adv7511->bridge);
 err_unregister_cec:
        i2c_unregister_device(adv7511->i2c_cec);
        if (adv7511->cec_clk)