[PATCH v3 7/7] drm/sysfb: simpledrm: Read panel orientation from DT node

[Thomas Zimmermann <tzimmermann@suse.de>]

A device-tree panel node can specify the panel's rotation in steps
of 90 degrees. Set the DRM connector orientation accordingly. Use
UNKNOWN for the orientation if the field is missing or invalid.

v3:
- read the orientation with drm_of_get_panel_orientation() (Thierry)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/sysfb/simpledrm.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sysfb/simpledrm.c b/drivers/gpu/drm/sysfb/simpledrm.c
index 9e0711e0095a..21ddf4502ecc 100644
--- a/drivers/gpu/drm/sysfb/simpledrm.c
+++ b/drivers/gpu/drm/sysfb/simpledrm.c
@@ -28,6 +28,7 @@
 #include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper.h>
 #include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_of.h>
 #include <drm/drm_print.h>
 #include <drm/drm_probe_helper.h>
 
@@ -623,6 +624,7 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 	int width, height, stride;
 	u16 width_mm = 0, height_mm = 0;
 	struct device_node *panel_node;
+	enum drm_panel_orientation orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
 	const struct drm_format_info *format;
 	u64 size;
 	struct resource *res, *mem = NULL;
@@ -698,6 +700,12 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 			ret = simplefb_get_panel_height_mm_of(dev, panel_node);
 			if (ret > 0)
 				height_mm = ret;
+			/*
+			 * Ignore errors from parsing the panel orientation. With
+			 * the orientation initialized to UNKNOWN, the connector
+			 * helpers will do the right thing.
+			 */
+			drm_of_get_panel_orientation(panel_node, &orientation);
 			of_node_put(panel_node);
 		}
 	} else {
@@ -861,8 +869,7 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 	if (ret)
 		return ERR_PTR(ret);
 	drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
-	drm_connector_set_panel_orientation_with_quirk(connector,
-						       DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
+	drm_connector_set_panel_orientation_with_quirk(connector, orientation,
 						       width, height);
 
 	ret = drm_connector_attach_encoder(connector, encoder);
-- 
2.54.0