[PATCH v7 0/8] Add a panel API to set orientation properly

[PATCH v7 0/8] Add a panel API to set orientation properly

[Hsin-Yi Wang]

Panels usually call drm_connector_set_panel_orientation(), which is
later than drm/kms driver calling drm_dev_register(). This leads to a
WARN()[1].

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

The series add a panel API drm_connector_set_orientation_from_panel()
for drm/kms drivers. The drivers can call the API to set panel's
orientation before drm_dev_register().

Panel needs to implement .get_orientation callback to return the property.

[1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220530081910.3947168-2-hsinyi@chromium.org/

Hsin-Yi Wang (8):
  drm/panel: Add an API to allow drm to set orientation from panel
  drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback
  drm/panel: panel-edp: Implement .get_orientation callback
  drm/panel: lvds: Implement .get_orientation callback
  drm/panel: panel-simple: Implement .get_orientation callback
  drm/panel: ili9881c: Implement .get_orientation callback
  drm/panel: elida-kd35t133: Implement .get_orientation callback
  drm: Config orientation property if panel provides it

 drivers/gpu/drm/bridge/panel.c                | 34 +++++++++++++++++++
 drivers/gpu/drm/drm_bridge_connector.c        |  8 ++++-
 drivers/gpu/drm/drm_connector.c               | 31 +++++++++++++++++
 .../gpu/drm/panel/panel-boe-tv101wum-nl6.c    | 12 +++++++
 drivers/gpu/drm/panel/panel-edp.c             | 13 ++++++-
 drivers/gpu/drm/panel/panel-elida-kd35t133.c  | 12 +++++++
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 12 +++++++
 drivers/gpu/drm/panel/panel-lvds.c            | 13 +++++++
 drivers/gpu/drm/panel/panel-simple.c          | 14 +++++++-
 include/drm/drm_bridge.h                      | 14 ++++++++
 include/drm/drm_connector.h                   |  4 +++
 include/drm/drm_panel.h                       |  9 +++++
 12 files changed, 173 insertions(+), 3 deletions(-)

-- 
2.36.1.255.ge46751e96f-goog

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

[Hsin-Yi Wang]

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>
Reviewed-by: Stephen Boyd <swboyd@chromium.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

[PATCH v7 2/8] drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
index 1be150ac758f5..07f722f33fc5b 100644
--- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
+++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
@@ -1511,16 +1511,28 @@ static int boe_panel_get_modes(struct drm_panel *panel,
 	connector->display_info.width_mm = boe->desc->size.width_mm;
 	connector->display_info.height_mm = boe->desc->size.height_mm;
 	connector->display_info.bpc = boe->desc->bpc;
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, boe->orientation);
 
 	return 1;
 }
 
+static enum drm_panel_orientation boe_panel_get_orientation(struct drm_panel *panel)
+{
+	struct boe_panel *boe = to_boe_panel(panel);
+
+	return boe->orientation;
+}
+
 static const struct drm_panel_funcs boe_panel_funcs = {
 	.unprepare = boe_panel_unprepare,
 	.prepare = boe_panel_prepare,
 	.enable = boe_panel_enable,
 	.get_modes = boe_panel_get_modes,
+	.get_orientation = boe_panel_get_orientation,
 };
 
 static int boe_panel_add(struct boe_panel *boe)
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 3/8] drm/panel: panel-edp: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-edp.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-edp.c b/drivers/gpu/drm/panel/panel-edp.c
index c96014464355c..ee622c1dd5322 100644
--- a/drivers/gpu/drm/panel/panel-edp.c
+++ b/drivers/gpu/drm/panel/panel-edp.c
@@ -586,7 +586,10 @@ static int panel_edp_get_modes(struct drm_panel *panel,
 	else if (!num)
 		dev_warn(p->base.dev, "No display modes\n");
 
-	/* set up connector's "panel orientation" property */
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, p->orientation);
 
 	return num;
@@ -609,6 +612,13 @@ static int panel_edp_get_timings(struct drm_panel *panel,
 	return p->desc->num_timings;
 }
 
+static enum drm_panel_orientation panel_edp_get_orientation(struct drm_panel *panel)
+{
+	struct panel_edp *p = to_panel_edp(panel);
+
+       return p->orientation;
+}
+
 static int detected_panel_show(struct seq_file *s, void *data)
 {
 	struct drm_panel *panel = s->private;
@@ -637,6 +647,7 @@ static const struct drm_panel_funcs panel_edp_funcs = {
 	.prepare = panel_edp_prepare,
 	.enable = panel_edp_enable,
 	.get_modes = panel_edp_get_modes,
+	.get_orientation = panel_edp_get_orientation,
 	.get_timings = panel_edp_get_timings,
 	.debugfs_init = panel_edp_debugfs_init,
 };
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 4/8] drm/panel: lvds: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-lvds.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
index f11252fb00fea..7a4fedc63e8ec 100644
--- a/drivers/gpu/drm/panel/panel-lvds.c
+++ b/drivers/gpu/drm/panel/panel-lvds.c
@@ -99,15 +99,28 @@ static int panel_lvds_get_modes(struct drm_panel *panel,
 	drm_display_info_set_bus_formats(&connector->display_info,
 					 &lvds->bus_format, 1);
 	connector->display_info.bus_flags = lvds->bus_flags;
+
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, lvds->orientation);
 
 	return 1;
 }
 
+static enum drm_panel_orientation panel_lvds_get_orientation(struct drm_panel *panel)
+{
+       struct panel_lvds *lvds = to_panel_lvds(panel);
+
+       return lvds->orientation;
+}
+
 static const struct drm_panel_funcs panel_lvds_funcs = {
 	.unprepare = panel_lvds_unprepare,
 	.prepare = panel_lvds_prepare,
 	.get_modes = panel_lvds_get_modes,
+	.get_orientation = panel_lvds_get_orientation,
 };
 
 static int panel_lvds_parse_dt(struct panel_lvds *lvds)
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 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 <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 4a2e580a2f7b7..b4b9195251891 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -411,7 +411,10 @@ 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 */
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, p->orientation);
 
 	return num;
@@ -434,12 +437,21 @@ 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,
 	.prepare = panel_simple_prepare,
 	.enable = panel_simple_enable,
 	.get_modes = panel_simple_get_modes,
+	.get_orientation = panel_simple_get_orientation,
 	.get_timings = panel_simple_get_timings,
 };
 
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 6/8] drm/panel: ili9881c: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
index ba30d11547ade..58d6798c25ed8 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9881c.c
@@ -853,17 +853,29 @@ static int ili9881c_get_modes(struct drm_panel *panel,
 	connector->display_info.width_mm = mode->width_mm;
 	connector->display_info.height_mm = mode->height_mm;
 
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, ctx->orientation);
 
 	return 1;
 }
 
+static enum drm_panel_orientation ili9881c_get_orientation(struct drm_panel *panel)
+{
+       struct ili9881c *ctx = panel_to_ili9881c(panel);
+
+       return ctx->orientation;
+}
+
 static const struct drm_panel_funcs ili9881c_funcs = {
 	.prepare	= ili9881c_prepare,
 	.unprepare	= ili9881c_unprepare,
 	.enable		= ili9881c_enable,
 	.disable	= ili9881c_disable,
 	.get_modes	= ili9881c_get_modes,
+	.get_orientation = ili9881c_get_orientation,
 };
 
 static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 7/8] drm/panel: elida-kd35t133: Implement .get_orientation callback

[Hsin-Yi Wang]

To return the orientation property to drm/kms driver.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
 drivers/gpu/drm/panel/panel-elida-kd35t133.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-elida-kd35t133.c b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
index 80227617a4d6e..fa613d1d7a8ff 100644
--- a/drivers/gpu/drm/panel/panel-elida-kd35t133.c
+++ b/drivers/gpu/drm/panel/panel-elida-kd35t133.c
@@ -217,15 +217,27 @@ static int kd35t133_get_modes(struct drm_panel *panel,
 	connector->display_info.width_mm = mode->width_mm;
 	connector->display_info.height_mm = mode->height_mm;
 	drm_mode_probed_add(connector, mode);
+	/*
+	 * TODO: Remove once all drm drivers call
+	 * drm_connector_set_orientation_from_panel()
+	 */
 	drm_connector_set_panel_orientation(connector, ctx->orientation);
 
 	return 1;
 }
 
+static enum drm_panel_orientation kd35t133_get_orientation(struct drm_panel *panel)
+{
+       struct kd35t133 *ctx = panel_to_kd35t133(panel);
+
+       return ctx->orientation;
+}
+
 static const struct drm_panel_funcs kd35t133_funcs = {
 	.unprepare	= kd35t133_unprepare,
 	.prepare	= kd35t133_prepare,
 	.get_modes	= kd35t133_get_modes,
+	.get_orientation = kd35t133_get_orientation,
 };
 
 static int kd35t133_probe(struct mipi_dsi_device *dsi)
-- 
2.36.1.255.ge46751e96f-goog

[PATCH v7 8/8] drm: Config orientation property if panel provides it

[Hsin-Yi Wang]

Panel orientation property should be set before drm_dev_register().
Some 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.

In drm_bridge_connector_init(), if a bridge is a panel bridge, use it to
set the connector's panel orientation property.

Suggested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
v6->v7: remove redundant check and fix config issue.
---
 drivers/gpu/drm/bridge/panel.c         | 34 ++++++++++++++++++++++++++
 drivers/gpu/drm/drm_bridge_connector.c |  8 +++++-
 include/drm/drm_bridge.h               | 14 +++++++++++
 3 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 0ee563eb2b6f9..4277bf4f032be 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -170,6 +170,19 @@ static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
 	.debugfs_init = panel_bridge_debugfs_init,
 };
 
+/**
+ * drm_bridge_is_panel - Checks if a drm_bridge is a panel_bridge.
+ *
+ * @bridge: The drm_bridge to be checked.
+ *
+ * Returns true if the bridge is a panel bridge, or false otherwise.
+ */
+bool drm_bridge_is_panel(const struct drm_bridge *bridge)
+{
+	return bridge->funcs == &panel_bridge_bridge_funcs;
+}
+EXPORT_SYMBOL(drm_bridge_is_panel);
+
 /**
  * drm_panel_bridge_add - Creates a &drm_bridge and &drm_connector that
  * just calls the appropriate functions from &drm_panel.
@@ -269,6 +282,27 @@ void drm_panel_bridge_remove(struct drm_bridge *bridge)
 }
 EXPORT_SYMBOL(drm_panel_bridge_remove);
 
+/**
+ * drm_panel_bridge_set_orientation - Set the connector's panel orientation
+ * from the bridge that can be transformed to panel bridge.
+ *
+ * @connector: The connector to be set panel orientation.
+ * @bridge: The drm_bridge to be transformed to panel bridge.
+ *
+ * Returns 0 on success, negative errno on failure.
+ */
+int drm_panel_bridge_set_orientation(struct drm_connector *connector,
+				     struct drm_bridge *bridge)
+{
+	struct panel_bridge *panel_bridge;
+
+	panel_bridge = drm_bridge_to_panel_bridge(bridge);
+
+	return drm_connector_set_orientation_from_panel(connector,
+							panel_bridge->panel);
+}
+EXPORT_SYMBOL(drm_panel_bridge_set_orientation);
+
 static void devm_drm_panel_bridge_release(struct device *dev, void *res)
 {
 	struct drm_bridge **bridge = res;
diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
index 6b3dad03d77d0..1c7d936523df5 100644
--- a/drivers/gpu/drm/drm_bridge_connector.c
+++ b/drivers/gpu/drm/drm_bridge_connector.c
@@ -331,7 +331,7 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 	struct drm_bridge_connector *bridge_connector;
 	struct drm_connector *connector;
 	struct i2c_adapter *ddc = NULL;
-	struct drm_bridge *bridge;
+	struct drm_bridge *bridge, *panel_bridge = NULL;
 	int connector_type;
 
 	bridge_connector = kzalloc(sizeof(*bridge_connector), GFP_KERNEL);
@@ -373,6 +373,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 
 		if (bridge->ddc)
 			ddc = bridge->ddc;
+
+		if (drm_bridge_is_panel(bridge))
+			panel_bridge = bridge;
 	}
 
 	if (connector_type == DRM_MODE_CONNECTOR_Unknown) {
@@ -392,6 +395,9 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
 		connector->polled = DRM_CONNECTOR_POLL_CONNECT
 				  | DRM_CONNECTOR_POLL_DISCONNECT;
 
+	if (panel_bridge)
+		drm_panel_bridge_set_orientation(connector, panel_bridge);
+
 	return connector;
 }
 EXPORT_SYMBOL_GPL(drm_bridge_connector_init);
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index f27b4060faa2f..bd11bbe5e9b33 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -917,16 +917,30 @@ void drm_bridge_hpd_notify(struct drm_bridge *bridge,
 			   enum drm_connector_status status);
 
 #ifdef CONFIG_DRM_PANEL_BRIDGE
+bool drm_bridge_is_panel(const struct drm_bridge *bridge);
 struct drm_bridge *drm_panel_bridge_add(struct drm_panel *panel);
 struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
 					      u32 connector_type);
 void drm_panel_bridge_remove(struct drm_bridge *bridge);
+int drm_panel_bridge_set_orientation(struct drm_connector *connector,
+                                     struct drm_bridge *bridge);
 struct drm_bridge *devm_drm_panel_bridge_add(struct device *dev,
 					     struct drm_panel *panel);
 struct drm_bridge *devm_drm_panel_bridge_add_typed(struct device *dev,
 						   struct drm_panel *panel,
 						   u32 connector_type);
 struct drm_connector *drm_panel_bridge_connector(struct drm_bridge *bridge);
+#else
+static inline bool drm_bridge_is_panel(const struct drm_bridge *bridge)
+{
+	return false;
+}
+
+static inline int drm_panel_bridge_set_orientation(struct drm_connector *connector,
+						   struct drm_bridge *bridge)
+{
+	return -EINVAL;
+}
 #endif
 
 #if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL_BRIDGE)
-- 
2.36.1.255.ge46751e96f-goog

Re: [PATCH v7 8/8] drm: Config orientation property if panel provides it

[Doug Anderson]

Hi,

On Thu, Jun 9, 2022 at 12:28 AM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> Panel orientation property should be set before drm_dev_register().
> Some 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.
>
> In drm_bridge_connector_init(), if a bridge is a panel bridge, use it to
> set the connector's panel orientation property.
>
> Suggested-by: Doug Anderson <dianders@chromium.org>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
> v6->v7: remove redundant check and fix config issue.
> ---
>  drivers/gpu/drm/bridge/panel.c         | 34 ++++++++++++++++++++++++++
>  drivers/gpu/drm/drm_bridge_connector.c |  8 +++++-
>  include/drm/drm_bridge.h               | 14 +++++++++++
>  3 files changed, 55 insertions(+), 1 deletion(-)

Reviewed-by: Doug Anderson <dianders@chromium.org>

Re: [PATCH v7 8/8] drm: Config orientation property if panel provides it

[Stephen Boyd]

Quoting Hsin-Yi Wang (2022-06-09 00:27:23)
> Panel orientation property should be set before drm_dev_register().
> Some 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.
>
> In drm_bridge_connector_init(), if a bridge is a panel bridge, use it to
> set the connector's panel orientation property.
>
> Suggested-by: Doug Anderson <dianders@chromium.org>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@chromium.org>

Re: [PATCH v7 0/8] Add a panel API to set orientation properly

[Hsin-Yi Wang]

On Thu, Jun 9, 2022 at 3:27 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> Panels usually call drm_connector_set_panel_orientation(), which is
> later than drm/kms driver calling drm_dev_register(). This leads to a
> WARN()[1].
>
> The orientation property is known earlier. For example, some panels
> parse the property through device tree during probe.
>
> The series add a panel API drm_connector_set_orientation_from_panel()
> for drm/kms drivers. The drivers can call the API to set panel's
> orientation before drm_dev_register().
>
> Panel needs to implement .get_orientation callback to return the property.
>
> [1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220530081910.3947168-2-hsinyi@chromium.org/
>
> Hsin-Yi Wang (8):
>   drm/panel: Add an API to allow drm to set orientation from panel
>   drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback
>   drm/panel: panel-edp: Implement .get_orientation callback
>   drm/panel: lvds: Implement .get_orientation callback
>   drm/panel: panel-simple: Implement .get_orientation callback
>   drm/panel: ili9881c: Implement .get_orientation callback
>   drm/panel: elida-kd35t133: Implement .get_orientation callback
>   drm: Config orientation property if panel provides it
>
hi Maintainers,

All the patches are reviewed. If there's no other comments, will this
series be picked? Thanks.

>  drivers/gpu/drm/bridge/panel.c                | 34 +++++++++++++++++++
>  drivers/gpu/drm/drm_bridge_connector.c        |  8 ++++-
>  drivers/gpu/drm/drm_connector.c               | 31 +++++++++++++++++
>  .../gpu/drm/panel/panel-boe-tv101wum-nl6.c    | 12 +++++++
>  drivers/gpu/drm/panel/panel-edp.c             | 13 ++++++-
>  drivers/gpu/drm/panel/panel-elida-kd35t133.c  | 12 +++++++
>  drivers/gpu/drm/panel/panel-ilitek-ili9881c.c | 12 +++++++
>  drivers/gpu/drm/panel/panel-lvds.c            | 13 +++++++
>  drivers/gpu/drm/panel/panel-simple.c          | 14 +++++++-
>  include/drm/drm_bridge.h                      | 14 ++++++++
>  include/drm/drm_connector.h                   |  4 +++
>  include/drm/drm_panel.h                       |  9 +++++
>  12 files changed, 173 insertions(+), 3 deletions(-)
>
> --
> 2.36.1.255.ge46751e96f-goog
>

Re: [PATCH v7 0/8] Add a panel API to set orientation properly

[Doug Anderson]

Hi,

On Tue, Jun 14, 2022 at 10:50 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>
> On Thu, Jun 9, 2022 at 3:27 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
> >
> > Panels usually call drm_connector_set_panel_orientation(), which is
> > later than drm/kms driver calling drm_dev_register(). This leads to a
> > WARN()[1].
> >
> > The orientation property is known earlier. For example, some panels
> > parse the property through device tree during probe.
> >
> > The series add a panel API drm_connector_set_orientation_from_panel()
> > for drm/kms drivers. The drivers can call the API to set panel's
> > orientation before drm_dev_register().
> >
> > Panel needs to implement .get_orientation callback to return the property.
> >
> > [1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220530081910.3947168-2-hsinyi@chromium.org/
> >
> > Hsin-Yi Wang (8):
> >   drm/panel: Add an API to allow drm to set orientation from panel
> >   drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback
> >   drm/panel: panel-edp: Implement .get_orientation callback
> >   drm/panel: lvds: Implement .get_orientation callback
> >   drm/panel: panel-simple: Implement .get_orientation callback
> >   drm/panel: ili9881c: Implement .get_orientation callback
> >   drm/panel: elida-kd35t133: Implement .get_orientation callback
> >   drm: Config orientation property if panel provides it
> >
> hi Maintainers,
>
> All the patches are reviewed. If there's no other comments, will this
> series be picked? Thanks.

Unless someone beat me to it or yells, my plan was to land them to
drm-misc-next next week. Since it touches core code I wanted to give a
little extra time. Also at the moment patch #8 is all Chromium (all
author and reviewers are chromium.org) at the moment so that's another
reason to make sure it has sufficient time on the lists.

-Doug

Re: [PATCH v7 0/8] Add a panel API to set orientation properly

[Doug Anderson]

Hi,

On Wed, Jun 15, 2022 at 6:36 AM Doug Anderson <dianders@chromium.org> wrote:
>
> Hi,
>
> On Tue, Jun 14, 2022 at 10:50 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
> >
> > On Thu, Jun 9, 2022 at 3:27 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
> > >
> > > Panels usually call drm_connector_set_panel_orientation(), which is
> > > later than drm/kms driver calling drm_dev_register(). This leads to a
> > > WARN()[1].
> > >
> > > The orientation property is known earlier. For example, some panels
> > > parse the property through device tree during probe.
> > >
> > > The series add a panel API drm_connector_set_orientation_from_panel()
> > > for drm/kms drivers. The drivers can call the API to set panel's
> > > orientation before drm_dev_register().
> > >
> > > Panel needs to implement .get_orientation callback to return the property.
> > >
> > > [1] https://patchwork.kernel.org/project/linux-mediatek/patch/20220530081910.3947168-2-hsinyi@chromium.org/
> > >
> > > Hsin-Yi Wang (8):
> > >   drm/panel: Add an API to allow drm to set orientation from panel
> > >   drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback
> > >   drm/panel: panel-edp: Implement .get_orientation callback
> > >   drm/panel: lvds: Implement .get_orientation callback
> > >   drm/panel: panel-simple: Implement .get_orientation callback
> > >   drm/panel: ili9881c: Implement .get_orientation callback
> > >   drm/panel: elida-kd35t133: Implement .get_orientation callback
> > >   drm: Config orientation property if panel provides it
> > >
> > hi Maintainers,
> >
> > All the patches are reviewed. If there's no other comments, will this
> > series be picked? Thanks.
>
> Unless someone beat me to it or yells, my plan was to land them to
> drm-misc-next next week. Since it touches core code I wanted to give a
> little extra time. Also at the moment patch #8 is all Chromium (all
> author and reviewers are chromium.org) at the moment so that's another
> reason to make sure it has sufficient time on the lists.

As promised, I've pushed to drm-misc-next. Note: I had to fix
whitespace problems in almost every patch. Please run checkpatch on
your patches.

15b9ca1641f0 drm: Config orientation property if panel provides it
a64af136771a drm/panel: elida-kd35t133: Implement .get_orientation callback
db9b4ffbfa82 drm/panel: ili9881c: Implement .get_orientation callback
a960e35ac011 drm/panel: panel-simple: Implement .get_orientation callback
c0398df2a195 drm/panel: lvds: Implement .get_orientation callback
47bef230225b drm/panel: panel-edp: Implement .get_orientation callback
3fa214eea43a drm/panel: boe-tv101wum-nl6: Implement .get_orientation callback
5e41b01a7808 drm/panel: Add an API to allow drm to set orientation from panel

-Doug