[PATCH] drm: bridge: panel: Register connector if DRM device is already registered

[Marek Szyprowski]

If panel_bridge_attach() happens after DRM device registration, the
created connector will not be registered by the DRM core anymore. Fix
this by registering it explicitely in such case.

This fixes the following issue observed on Samsung Exynos4210-based Trats
board with a DSI panel (the panel driver is registed after the Exynos DRM
component device is bound):

$ ./modetest -c -Mexynos
could not get connector 56: No such file or directory
Segmentation fault

While touching this, move the connector reset() call also under the DRM
device registered check, because otherwise it is not really needed.

Fixes: 934aef885f9d ("drm: bridge: panel: Reset the connector state pointer")
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
Here is a bit more backgroud on this issue is available in this thread:
https://lore.kernel.org/all/f0474a95-4ba3-a74f-d7de-ef7aab12bc86@samsung.com/
---
 drivers/gpu/drm/bridge/panel.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index ff1c37b2e6e5..0ee563eb2b6f 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -83,8 +83,11 @@ static int panel_bridge_attach(struct drm_bridge *bridge,
 	drm_connector_attach_encoder(&panel_bridge->connector,
 					  bridge->encoder);
 
-	if (connector->funcs->reset)
-		connector->funcs->reset(connector);
+	if (bridge->dev->registered) {
+		if (connector->funcs->reset)
+			connector->funcs->reset(connector);
+		drm_connector_register(connector);
+	}
 
 	return 0;
 }
-- 
2.17.1