On some devices the LCD panel is mounted in the casing in such a way that the up/top side of the panel does not match with the top side of the device (e.g. it is mounted upside-down).
This commit adds the necessary infra for lcd-panel drm_connector-s to have a "panel orientation" property to communicate how the panel is orientated vs the casing.
Userspace can use this property to check for non-normal orientation and then adjust the displayed image accordingly by rotating it to compensate.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- Changes in v2: -Rebased on 4.14-rc1 -Store panel_orientation in drm_display_info, so that drm_fb_helper.c can access it easily -Have a single drm_connector_init_panel_orientation_property rather then create and attach functions. The caller is expected to set drm_display_info.panel_orientation before calling this, then this will check for platform specific quirks overriding the panel_orientation and if the panel_orientation is set after this then it will attach the property. --- drivers/gpu/drm/drm_connector.c | 86 +++++++++++++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 11 ++++++ include/drm/drm_mode_config.h | 7 ++++ include/uapi/drm/drm_mode.h | 7 ++++ 4 files changed, 111 insertions(+)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index ba9f36cef68c..0159800b30a7 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -212,6 +212,8 @@ int drm_connector_init(struct drm_device *dev, mutex_init(&connector->mutex); connector->edid_blob_ptr = NULL; connector->status = connector_status_unknown; + connector->display_info.panel_orientation = + DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
drm_connector_get_cmdline_mode(connector);
@@ -665,6 +667,13 @@ static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = { { DRM_MODE_PICTURE_ASPECT_16_9, "16:9" }, };
+static const struct drm_prop_enum_list drm_panel_orientation_enum_list[] = { + { DRM_MODE_PANEL_ORIENTATION_NORMAL, "Normal" }, + { DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP, "Upside Down" }, + { DRM_MODE_PANEL_ORIENTATION_LEFT_UP, "Left Side Up" }, + { DRM_MODE_PANEL_ORIENTATION_RIGHT_UP, "Right Side Up" }, +}; + static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = { { DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */ { DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */ @@ -746,6 +755,18 @@ DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name, * * CRTC_ID: * Mode object ID of the &drm_crtc this connector should be connected to. + * + * Connectors for LCD panels may also have one standardized property: + * + * panel orientation: + * On some devices the LCD panel is mounted in the casing in such a way + * that the up/top side of the panel does not match with the top side of + * the device. Userspace can use this property to check for this. + * Note that input coordinates from touchscreens (input devices with + * 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. */
int drm_connector_create_standard_properties(struct drm_device *dev) @@ -1212,6 +1233,71 @@ void drm_mode_connector_set_link_status_property(struct drm_connector *connector } EXPORT_SYMBOL(drm_mode_connector_set_link_status_property);
+/** + * drm_connector_init_panel_orientation_property - + * initialize the connecters panel_orientation property + * @connector: connector for which to init the panel-orientation property. + * @width: width in pixels of the panel, used for panel quirk detection + * @height: height in pixels of the panel, used for panel quirk detection + * + * This function should only be called for built-in panels, after setting + * connector->display_info.panel_orientation first (if known). + * + * This function will check for platform specific (e.g. DMI based) quirks + * overriding display_info.panel_orientation first, then if panel_orientation + * is not DRM_MODE_PANEL_ORIENTATION_UNKNOWN it will attach the + * "panel orientation" property to the connector. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_connector_init_panel_orientation_property( + struct drm_connector *connector, int width, int height) +{ + struct drm_device *dev = connector->dev; + struct drm_display_info *info = &connector->display_info; + struct drm_property *prop; + + /* + * Note fb_get_panel_rotate_quirk returns the rotation needed to + * *correct* for the panel orientation. + */ + switch (fb_get_panel_rotate_quirk(width, height)) { + case FB_ROTATE_UR: + info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL; + break; + case FB_ROTATE_CW: + info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP; + break; + case FB_ROTATE_UD: + info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP; + break; + case FB_ROTATE_CCW: + info->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP; + break; + } + + if (info->panel_orientation == DRM_MODE_PANEL_ORIENTATION_UNKNOWN) + return 0; + + 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; + + dev->mode_config.panel_orientation_property = prop; + } + + drm_object_attach_property(&connector->base, prop, + info->panel_orientation); + return 0; +} +EXPORT_SYMBOL(drm_connector_init_panel_orientation_property); + int drm_mode_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 ea8da401c93c..04592f9daa46 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -222,6 +222,15 @@ struct drm_display_info { #define DRM_COLOR_FORMAT_YCRCB422 (1<<2) #define DRM_COLOR_FORMAT_YCRCB420 (1<<3)
+ /** + * @panel_orientation: Read only connector property for built-in panels, + * indicating the orientation of the panel vs the device's casing. + * drm_connector_init() sets this to DRM_MODE_PANEL_ORIENTATION_UNKNOWN. + * When not UNKNOWN this gets used by the drm_fb_helpers to rotate the + * fb to compensate and gets exported as prop to userspace. + */ + int panel_orientation; + /** * @color_formats: HDMI Color formats, selects between RGB and YCrCb * modes. Used DRM_COLOR_FORMAT_ defines, which are _not_ the same ones @@ -1012,6 +1021,8 @@ int drm_mode_connector_update_edid_property(struct drm_connector *connector, const struct edid *edid); void drm_mode_connector_set_link_status_property(struct drm_connector *connector, uint64_t link_status); +int drm_connector_init_panel_orientation_property( + struct drm_connector *connector, int width, int height);
/** * struct drm_tile_group - Tile group metadata diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h index 1b37368416c8..6db187e4c747 100644 --- a/include/drm/drm_mode_config.h +++ b/include/drm/drm_mode_config.h @@ -741,6 +741,13 @@ struct drm_mode_config { */ struct drm_property *suggested_y_property;
+ /** + * @panel_orientation_property: Optional connector property indicating + * how the lcd-panel is mounted inside the casing (e.g. normal or + * upside-down). + */ + struct drm_property *panel_orientation_property; + /* dumb ioctl parameters */ uint32_t preferred_depth, prefer_shadow;
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 54fc38c3c3f1..1a5dae7ba01c 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -127,6 +127,13 @@ extern "C" { #define DRM_MODE_LINK_STATUS_GOOD 0 #define DRM_MODE_LINK_STATUS_BAD 1
+/* Panel Orientation options */ +#define DRM_MODE_PANEL_ORIENTATION_UNKNOWN -1 +#define DRM_MODE_PANEL_ORIENTATION_NORMAL 0 +#define DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP 1 +#define DRM_MODE_PANEL_ORIENTATION_LEFT_UP 2 +#define DRM_MODE_PANEL_ORIENTATION_RIGHT_UP 3 + /* * DRM_MODE_ROTATE_<degrees> *