linux-kernel - [PATCH v5 8/8] drm/mediatek: Config orientation property if panel provides it

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Message-Id: <20220607090549.2345795-9-hsinyi@chromium.org>
Date:   Tue,  7 Jun 2022 17:05:49 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Rob Clark <robdclark@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 8/8] drm/mediatek: Config orientation property if panel provides it

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@...omium.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
v4->v5:
- use the new function in v5.
- don't use drm_of_find_panel_or_bridge().
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index d9f10a33e6fa..998b1237e193 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 +823,10 @@ 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 */
+	drm_connector_set_orientation_from_panel(dsi->connector, dsi->panel);
+
 	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
 
 	return 0;
@@ -836,6 +841,16 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 	int ret;
 	struct drm_device *drm = data;
 	struct mtk_dsi *dsi = dev_get_drvdata(dev);
+	struct device_node *panel_node;
+
+	/* Get panel if existed */
+	panel_node = of_graph_get_remote_node(dev->of_node, 0, 0);
+	if (panel_node) {
+		dsi->panel = of_drm_find_panel(panel_node);
+		if (IS_ERR(dsi->panel))
+			dsi->panel = NULL;
+		of_node_put(panel_node);
+	}
 
 	ret = mtk_dsi_encoder_init(drm, dsi);
 	if (ret)
-- 
2.36.1.255.ge46751e96f-goog