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Subject[PATCH v6 1/8] drm/panel: Add an API to allow drm to set orientation from panel
Date
Panels usually call drm_connector_set_panel_orientation(), which is
later than drm/kms driver calling drm_dev_register(). This leads to a
WARN().

The orientation property is known earlier. For example, some panels
parse the property through device tree during probe.

Add an API to return the property from panel to drm/kms driver, so the
drivers are able to call drm_connector_set_orientation_from_panel() before
drm_dev_register().

Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---
drivers/gpu/drm/drm_connector.c | 32 ++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 4 ++++
include/drm/drm_panel.h | 9 +++++++++
3 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 1c48d162c77e..859165a1c8f1 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -24,6 +24,7 @@
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
+#include <drm/drm_panel.h>
#include <drm/drm_utils.h>
#include <drm/drm_print.h>
#include <drm/drm_drv.h>
@@ -2320,6 +2321,9 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
* It is allowed to call this function with a panel_orientation of
* DRM_MODE_PANEL_ORIENTATION_UNKNOWN, in which case it is a no-op.
*
+ * The function shouldn't be called in panel after drm is registered (i.e.
+ * drm_dev_register() is called in drm).
+ *
* Returns:
* Zero on success, negative errno on failure.
*/
@@ -2389,6 +2393,34 @@ int drm_connector_set_panel_orientation_with_quirk(
}
EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);

+/**
+ * drm_connector_set_orientation_from_panel -
+ * set the connector's panel_orientation from panel's callback.
+ * @connector: connector for which to init the panel-orientation property.
+ * @panel: panel that can provide orientation information.
+ *
+ * Drm drivers should call this function before drm_dev_register().
+ * Orientation is obtained from panel's .get_orientation() callback.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_set_orientation_from_panel(
+ struct drm_connector *connector,
+ struct drm_panel *panel)
+{
+ enum drm_panel_orientation panel_orientation;
+
+ if (panel && panel->funcs && panel->funcs->get_orientation)
+ panel_orientation = panel->funcs->get_orientation(panel);
+ else
+ panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+
+ return drm_connector_set_panel_orientation(connector,
+ panel_orientation);
+}
+EXPORT_SYMBOL(drm_connector_set_orientation_from_panel);
+
static const struct drm_prop_enum_list privacy_screen_enum[] = {
{ PRIVACY_SCREEN_DISABLED, "Disabled" },
{ PRIVACY_SCREEN_ENABLED, "Enabled" },
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 3ac4bf87f257..94b422b55cc1 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -38,6 +38,7 @@ struct drm_modeset_acquire_ctx;
struct drm_device;
struct drm_crtc;
struct drm_encoder;
+struct drm_panel;
struct drm_property;
struct drm_property_blob;
struct drm_printer;
@@ -1802,6 +1803,9 @@ int drm_connector_set_panel_orientation_with_quirk(
struct drm_connector *connector,
enum drm_panel_orientation panel_orientation,
int width, int height);
+int drm_connector_set_orientation_from_panel(
+ struct drm_connector *connector,
+ struct drm_panel *panel);
int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
int min, int max);
void drm_connector_create_privacy_screen_properties(struct drm_connector *conn);
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index d279ee455f01..3a271128c078 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -116,6 +116,15 @@ struct drm_panel_funcs {
int (*get_modes)(struct drm_panel *panel,
struct drm_connector *connector);

+ /**
+ * @get_orientation:
+ *
+ * Return the panel orientation set by device tree or EDID.
+ *
+ * This function is optional.
+ */
+ enum drm_panel_orientation (*get_orientation)(struct drm_panel *panel);
+
/**
* @get_timings:
*
--
2.36.1.255.ge46751e96f-goog
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