linux-kernel - [PATCH v7 1/8] drm/panel: Add an API to allow drm to set orientation from panel

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Date:   Thu,  9 Jun 2022 15:27:15 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Hans de Goede <hdegoede@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        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>,
        dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 1/8] drm/panel: Add an API to allow drm to set orientation from panel

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@...hat.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
---
v6->v7: remane variable.
---
 drivers/gpu/drm/drm_connector.c | 31 +++++++++++++++++++++++++++++++
 include/drm/drm_connector.h     |  4 ++++
 include/drm/drm_panel.h         |  9 +++++++++
 3 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 1c48d162c77e3..ab066a063f3ba 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 +2393,33 @@ 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 orientation;
+
+	if (panel && panel->funcs && panel->funcs->get_orientation)
+		orientation = panel->funcs->get_orientation(panel);
+	else
+		orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
+
+	return drm_connector_set_panel_orientation(connector, 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 3ac4bf87f2571..94b422b55cc1f 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 d279ee455f014..3a271128c0784 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