[PATCH 8/8] drm/mediatek: Config orientation property if panel provides it

[Hsin-Yi Wang]

Panel orientation property should be set before drm_dev_register().
Mediatek drm driver calls drm_dev_register() in .bind(). However, most
panels sets orientation property relatively late, mostly in .get_modes()
callback, since this is when they are able to get the connector and
binds the orientation property to it, though the value should be known
when the panel is probed.

Let the drm driver check if the remote end point is a panel and if it
contains the orientation property. If it does, set it before
drm_dev_register() is called.

Signed-off-by: Hsin-Yi Wang <hsinyi at chromium.org>
---
The concept is the same as the previous version.
https://patchwork.kernel.org/project/linux-mediatek/patch/20220530113033.124072-1-hsinyi@chromium.org/
The only difference is, it now uses the panel API instead of parsing
orientation from the driver.
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index bd3f5b485085..12836a697f56 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -185,6 +185,7 @@ struct mtk_dsi {
 	struct drm_encoder encoder;
 	struct drm_bridge bridge;
 	struct drm_bridge *next_bridge;
+	struct drm_panel *panel;
 	struct drm_connector *connector;
 	struct phy *phy;
 
@@ -822,6 +823,16 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
 		ret = PTR_ERR(dsi->connector);
 		goto err_cleanup_encoder;
 	}
+
+	/* Read panel orientation */
+	if (dsi->panel) {
+		enum drm_panel_orientation orientation;
+
+		orientation = drm_panel_get_orientation(dsi->panel);
+		if (orientation != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
+			drm_connector_set_panel_orientation(dsi->connector, orientation);
+	}
+
 	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
 
 	return 0;
@@ -837,6 +848,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 	struct drm_device *drm = data;
 	struct mtk_dsi *dsi = dev_get_drvdata(dev);
 
+	/* Get panel if existed */
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &dsi->panel, NULL);
+
 	ret = mtk_dsi_encoder_init(drm, dsi);
 	if (ret)
 		return ret;
-- 
2.36.1.255.ge46751e96f-goog