[PATCH v5 4/4] drm/panel: simple: Use managed helpers in panel-simple

[Osama Abdelkader <osama.abdelkader@gmail.com>]

Use the managed panel add helper in panel-simple and drop the manual
panel remove call from the remove path.

Keep the MIPI DSI attach and detach manual, since panel-simple's
remove callback also unprepares/disables the panel and releases the
DDC adapter; deferring the detach to devm would run it after that
cleanup instead of before, changing the teardown order.

Suggested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index c95964ba25a9..02d21dde5766 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -737,7 +737,9 @@ static struct panel_simple *panel_simple_probe(struct device *dev)
 		goto disable_pm_runtime;
 	}
 
-	drm_panel_add(&panel->base);
+	err = devm_drm_panel_add(dev, &panel->base);
+	if (err)
+		goto disable_pm_runtime;
 
 	return panel;
 
@@ -785,7 +787,6 @@ static void panel_simple_remove(struct device *dev)
 {
 	struct panel_simple *panel = dev_get_drvdata(dev);
 
-	drm_panel_remove(&panel->base);
 	panel_simple_shutdown(dev);
 
 	pm_runtime_dont_use_autosuspend(dev);
@@ -6540,7 +6541,6 @@ static int panel_simple_dsi_probe(struct mipi_dsi_device *dsi)
 {
 	const struct panel_desc_dsi *desc;
 	struct panel_simple *panel;
-	int err;
 
 	panel = panel_simple_probe(&dsi->dev);
 	if (IS_ERR(panel))
@@ -6551,14 +6551,7 @@ static int panel_simple_dsi_probe(struct mipi_dsi_device *dsi)
 	dsi->format = desc->format;
 	dsi->lanes = desc->lanes;
 
-	err = mipi_dsi_attach(dsi);
-	if (err) {
-		struct panel_simple *panel = mipi_dsi_get_drvdata(dsi);
-
-		drm_panel_remove(&panel->base);
-	}
-
-	return err;
+	return mipi_dsi_attach(dsi);
 }
 
 static void panel_simple_dsi_remove(struct mipi_dsi_device *dsi)
-- 
2.43.0