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Subject[PATCH v3 1/3] gpu: drm: separate panel orientation property creating and value setting
Date
drm_dev_register() sets connector->registration_state to
DRM_CONNECTOR_REGISTERED and dev->registered to true. If
drm_connector_set_panel_orientation() is first called after
drm_dev_register(), it will fail several checks and results in following
warning.

Add a function to create panel orientation property and set default value
to UNKNOWN, so drivers can call this function to init the property earlier
, and let the panel set the real value later.

[ 4.480976] ------------[ cut here ]------------
[ 4.485603] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xb4/0xbc
<snip>
[ 4.609772] Call trace:
[ 4.612208] __drm_mode_object_add+0xb4/0xbc
[ 4.616466] drm_mode_object_add+0x20/0x2c
[ 4.620552] drm_property_create+0xdc/0x174
[ 4.624723] drm_property_create_enum+0x34/0x98
[ 4.629241] drm_connector_set_panel_orientation+0x64/0xa0
[ 4.634716] boe_panel_get_modes+0x88/0xd8
[ 4.638802] drm_panel_get_modes+0x2c/0x48
[ 4.642887] panel_bridge_get_modes+0x1c/0x28
[ 4.647233] drm_bridge_connector_get_modes+0xa0/0xd4
[ 4.652273] drm_helper_probe_single_connector_modes+0x218/0x700
[ 4.658266] drm_mode_getconnector+0x1b4/0x45c
[ 4.662699] drm_ioctl_kernel+0xac/0x128
[ 4.666611] drm_ioctl+0x268/0x410
[ 4.670002] drm_compat_ioctl+0xdc/0xf0
[ 4.673829] __arm64_compat_sys_ioctl+0xc8/0x100
[ 4.678436] el0_svc_common+0xf4/0x1c0
[ 4.682174] do_el0_svc_compat+0x28/0x3c
[ 4.686088] el0_svc_compat+0x10/0x1c
[ 4.689738] el0_sync_compat_handler+0xa8/0xcc
[ 4.694171] el0_sync_compat+0x178/0x180
[ 4.698082] ---[ end trace b4f2db9d9c88610b ]---
[ 4.702721] ------------[ cut here ]------------
[ 4.707329] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:243 drm_object_attach_property+0x48/0xb8
<snip>
[ 4.833830] Call trace:
[ 4.836266] drm_object_attach_property+0x48/0xb8
[ 4.840958] drm_connector_set_panel_orientation+0x84/0xa0
[ 4.846432] boe_panel_get_modes+0x88/0xd8
[ 4.850516] drm_panel_get_modes+0x2c/0x48
[ 4.854600] panel_bridge_get_modes+0x1c/0x28
[ 4.858946] drm_bridge_connector_get_modes+0xa0/0xd4
[ 4.863984] drm_helper_probe_single_connector_modes+0x218/0x700
[ 4.869978] drm_mode_getconnector+0x1b4/0x45c
[ 4.874410] drm_ioctl_kernel+0xac/0x128
[ 4.878320] drm_ioctl+0x268/0x410
[ 4.881711] drm_compat_ioctl+0xdc/0xf0
[ 4.885536] __arm64_compat_sys_ioctl+0xc8/0x100
[ 4.890142] el0_svc_common+0xf4/0x1c0
[ 4.893879] do_el0_svc_compat+0x28/0x3c
[ 4.897791] el0_svc_compat+0x10/0x1c
[ 4.901441] el0_sync_compat_handler+0xa8/0xcc
[ 4.905873] el0_sync_compat+0x178/0x180
[ 4.909783] ---[ end trace b4f2db9d9c88610c ]---

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
v3:
create property in dsi driver and set value in panel.

v2:
create property in connector init
https://patchwork.kernel.org/project/linux-mediatek/patch/20210426051848.2600890-1-hsinyi@chromium.org/

v1:
set panel orientation in dsi driver
https://patchwork.kernel.org/project/linux-mediatek/patch/20210409045314.3420733-1-hsinyi@chromium.org/
---
drivers/gpu/drm/drm_connector.c | 58 +++++++++++++++++++++++++--------
include/drm/drm_connector.h | 2 ++
2 files changed, 47 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 7631f76e7f34..cda83314d7ad 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1210,7 +1210,7 @@ static const struct drm_prop_enum_list dp_colorspaces[] = {
* INPUT_PROP_DIRECT) will still map 1:1 to the actual LCD panel
* coordinates, so if userspace rotates the picture to adjust for
* the orientation it must also apply the same transformation to the
- * touchscreen input coordinates. This property is initialized by calling
+ * touchscreen input coordinates. This property value is set by calling
* drm_connector_set_panel_orientation() or
* drm_connector_set_panel_orientation_with_quirk()
*
@@ -2173,8 +2173,8 @@ EXPORT_SYMBOL(drm_connector_set_vrr_capable_property);
* @connector: connector for which to set the panel-orientation property.
* @panel_orientation: drm_panel_orientation value to set
*
- * This function sets the connector's panel_orientation and attaches
- * a "panel orientation" property to the connector.
+ * This function sets the connector's panel_orientation value. If the property
+ * doesn't exist, it will create one first.
*
* Calling this function on a connector where the panel_orientation has
* already been set is a no-op (e.g. the orientation has been overridden with
@@ -2206,18 +2206,16 @@ int drm_connector_set_panel_orientation(

prop = dev->mode_config.panel_orientation_property;
if (!prop) {
- prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
- "panel orientation",
- drm_panel_orientation_enum_list,
- ARRAY_SIZE(drm_panel_orientation_enum_list));
- if (!prop)
- return -ENOMEM;
+ int ret;

- dev->mode_config.panel_orientation_property = prop;
+ ret = drm_connector_init_panel_orientation_property(connector);
+ if (ret)
+ return ret;
+ prop = dev->mode_config.panel_orientation_property;
}

- drm_object_attach_property(&connector->base, prop,
- info->panel_orientation);
+ drm_object_property_set_value(&connector->base, prop,
+ info->panel_orientation);
return 0;
}
EXPORT_SYMBOL(drm_connector_set_panel_orientation);
@@ -2225,7 +2223,7 @@ EXPORT_SYMBOL(drm_connector_set_panel_orientation);
/**
* drm_connector_set_panel_orientation_with_quirk -
* set the connector's panel_orientation after checking for quirks
- * @connector: connector for which to init the panel-orientation property.
+ * @connector: connector for which to set the panel-orientation property.
* @panel_orientation: drm_panel_orientation value to set
* @width: width in pixels of the panel, used for panel quirk detection
* @height: height in pixels of the panel, used for panel quirk detection
@@ -2252,6 +2250,40 @@ int drm_connector_set_panel_orientation_with_quirk(
}
EXPORT_SYMBOL(drm_connector_set_panel_orientation_with_quirk);

+/**
+ * drm_connector_init_panel_orientation_property -
+ * create the connector's panel orientation property
+ *
+ * This function attaches a "panel orientation" property to the connector
+ * and initializes its value to DRM_MODE_PANEL_ORIENTATION_UNKNOWN.
+ *
+ * The value of the property can be set by drm_connector_set_panel_orientation()
+ * or drm_connector_set_panel_orientation_with_quirk() later.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_connector_init_panel_orientation_property(
+ struct drm_connector *connector)
+{
+ struct drm_device *dev = connector->dev;
+ struct drm_property *prop;
+
+ prop = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
+ "panel orientation",
+ drm_panel_orientation_enum_list,
+ ARRAY_SIZE(drm_panel_orientation_enum_list));
+ if (!prop)
+ return -ENOMEM;
+
+ dev->mode_config.panel_orientation_property = prop;
+ drm_object_attach_property(&connector->base, prop,
+ DRM_MODE_PANEL_ORIENTATION_UNKNOWN);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_connector_init_panel_orientation_property);
+
int drm_connector_set_obj_prop(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t value)
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 1922b278ffad..4396c1c4a5db 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1696,6 +1696,8 @@ 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_init_panel_orientation_property(
+ struct drm_connector *connector);
int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
int min, int max);

--
2.31.1.498.g6c1eba8ee3d-goog
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