[PATCH v4 5/8] drm/panel: panel-simple: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsi...@chromium.org>
Reviewed-by: Hans de Goede <hdego...@redhat.com>
Reviewed-by: Douglas Anderson <diand...@chromium.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c 
b/drivers/gpu/drm/panel/panel-simple.c
index 4a2e580a2f7b..f232b8cf4075 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -411,7 +411,12 @@ static int panel_simple_get_modes(struct drm_panel *panel,
        /* add hard-coded panel modes */
        num += panel_simple_get_non_edid_modes(p, connector);
 
-       /* set up connector's "panel orientation" property */
+       /*
+        * drm drivers are expected to call drm_panel_get_orientation() to get
+        * panel's orientation then drm_connector_set_panel_orientation() to
+        * set the property before drm_dev_register(). Otherwise there will be
+        * a WARN_ON if orientation is set after drm is registered.
+        */
        drm_connector_set_panel_orientation(connector, p->orientation);
 
        return num;
@@ -434,6 +439,14 @@ static int panel_simple_get_timings(struct drm_panel 
*panel,
        return p->desc->num_timings;
 }
 
+static enum drm_panel_orientation panel_simple_get_orientation(struct 
drm_panel *panel)
+{
+       struct panel_simple *p = to_panel_simple(panel);
+
+       return p->orientation;
+}
+
+
 static const struct drm_panel_funcs panel_simple_funcs = {
        .disable = panel_simple_disable,
        .unprepare = panel_simple_unprepare,
@@ -441,6 +454,7 @@ static const struct drm_panel_funcs panel_simple_funcs = {
        .enable = panel_simple_enable,
        .get_modes = panel_simple_get_modes,
        .get_timings = panel_simple_get_timings,
+       .get_orientation = panel_simple_get_orientation,
 };
 
 static struct panel_desc panel_dpi;
-- 
2.36.1.255.ge46751e96f-goog