/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_utils.h>
#include <drm/drm_print.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <linux/uaccess.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
/**
* DOC: overview
*
* In DRM connectors are the general abstraction for display sinks, and include
* als fixed panels or anything else that can display pixels in some form. As
* opposed to all other KMS objects representing hardware (like CRTC, encoder or
* plane abstractions) connectors can be hotplugged and unplugged at runtime.
* Hence they are reference-counted using drm_connector_get() and
* drm_connector_put().
*
* KMS driver must create, initialize, register and attach at a &struct
* drm_connector for each such sink. The instance is created as other KMS
* objects and initialized by setting the following fields. The connector is
* initialized with a call to drm_connector_init() with a pointer to the
* &struct drm_connector_funcs and a connector type, and then exposed to
* userspace with a call to drm_connector_register().
*
* Connectors must be attached to an encoder to be used. For devices that map
* connectors to encoders 1:1, the connector should be attached at
* initialization time with a call to drm_connector_attach_encoder(). The
* driver must also set the &drm_connector.encoder field to point to the
* attached encoder.
*
* For connectors which are not fixed (like built-in panels) the driver needs to
* support hotplug notifications. The simplest way to do that is by using the
* probe helpers, see drm_kms_helper_poll_init() for connectors which don't have
* hardware support for hotplug interrupts. Connectors with hardware hotplug
* support can instead use e.g. drm_helper_hpd_irq_event().
*/
struct drm_conn_prop_enum_list {
int type;
const char *name;
struct ida ida;
};
/*
* Connector and encoder types.
*/
static struct drm_conn_prop_enum_list drm_connector_enum_list[] = {
{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
{ DRM_MODE_CONNECTOR_VGA, "VGA" },
{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
{ DRM_MODE_CONNECTOR_Composite, "Composite" },
{ DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO" },
{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
{ DRM_MODE_CONNECTOR_Component, "Component" },
{ DRM_MODE_CONNECTOR_9PinDIN, "DIN" },
{ DRM_MODE_CONNECTOR_DisplayPort, "DP" },
{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
{ DRM_MODE_CONNECTOR_TV, "TV" },
{ DRM_MODE_CONNECTOR_eDP, "eDP" },
{ DRM_MODE_CONNECTOR_VIRTUAL, "Virtual" },
{ DRM_MODE_CONNECTOR_DSI, "DSI" },
{ DRM_MODE_CONNECTOR_DPI, "DPI" },
{ DRM_MODE_CONNECTOR_WRITEBACK, "Writeback" },
};
void drm_connector_ida_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
ida_init(&drm_connector_enum_list[i].ida);
}
void drm_connector_ida_destroy(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(drm_connector_enum_list); i++)
ida_destroy(&drm_connector_enum_list[i].ida);
}
/**
* drm_connector_get_cmdline_mode - reads the user's cmdline mode
* @connector: connector to quwery
*
* The kernel supports per-connector configuration of its consoles through
* use of the video= parameter. This function parses that option and
* extracts the user's specified mode (or enable/disable status) for a
* particular connector. This is typically only used during the early fbdev
* setup.
*/
static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
{
struct drm_cmdline_mode *mode = &connector->cmdline_mode;
char *option = NULL;
if (fb_get_options(connector->name, &option))
return;
if (!drm_mode_parse_command_line_for_connector(option,
connector,
mode))
return;
if (mode->force) {
DRM_INFO("forcing %s connector %s\n", connector->name,
drm_get_connector_force_name(mode->force));
connector->force = mode->force;
}
DRM_DEBUG_KMS("cmdline mode for connector %s %s %dx%d@%dHz%s%s%s\n",
connector->name,
mode->name,
mode->xres, mode->yres,
mode->refresh_specified ? mode->refresh : 60,
mode->rb ? " reduced blanking" : "",
mode->margins ? " with margins" : "",
mode->interlace ? " interlaced" : "");
}
static void drm_connector_free(struct kref *kref)
{
struct drm_connector *connector =
container_of(kref, struct drm_connector, base.refcount);
struct drm_device *dev = connector->dev;
drm_mode_object_unregister(dev, &connector->base);
connector->funcs->destroy(connector);
}
void drm_connector_free_work_fn(struct work_struct *work)
{
struct drm_connector *connector, *n;
struct drm_device *dev =
container_of(work, struct drm_device, mode_config.connector_free_work);
struct drm_mode_config *config = &dev->mode_config;
unsigned long flags;
struct llist_node *freed;
spin_lock_irqsave(&config->connector_list_lock, flags);
freed = llist_del_all(&config->connector_free_list);
spin_unlock_irqrestore(&config->connector_list_lock, flags);
llist_for_each_entry_safe(connector, n, freed, free_node) {
drm_mode_object_unregister(dev, &connector->base);
connector->funcs->destroy(connector);
}
}
/**
* drm_connector_init - Init a preallocated connector
* @dev: DRM device
* @connector: the connector to init
* @funcs: callbacks for this connector
* @connector_type: user visible type of the connector
*
* Initialises a preallocated connector. Connectors should be
* subclassed as part of driver connector objects.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_connector_init(struct drm_device *dev,
struct drm_connector *connector,
const struct drm_connector_funcs *funcs,
int connector_type)
{
struct drm_mode_config *config = &dev->mode_config;
int ret;
struct ida *connector_ida =
&drm_connector_enum_list[connector_type].ida;
WARN_ON(drm_drv_uses_atomic_modeset(dev) &&
(!funcs->atomic_destroy_state ||
!funcs->atomic_duplicate_state));
ret = __drm_mode_object_add(dev, &connector->base,
DRM_MODE_OBJECT_CONNECTOR,
false, drm_connector_free);
if (ret)
return ret;
connector->base.properties = &connector->properties;
connector->dev = dev;
connector->funcs = funcs;
/* connector index is used with 32bit bitmasks */
ret = ida_simple_get(&config->connector_ida, 0, 32, GFP_KERNEL);
if (ret < 0) {
DRM_DEBUG_KMS("Failed to allocate %s connector index: %d\n",
drm_connector_enum_list[connector_type].name,
ret);
goto out_put;
}
connector->index = ret;
ret = 0;
connector->connector_type = connector_type;
connector->connector_type_id =
ida_simple_get(connector_ida, 1, 0, GFP_KERNEL);
if (connector->connector_type_id < 0) {
ret = connector->connector_type_id;
goto out_put_id;
}
connector->name =
kasprintf(GFP_KERNEL, "%s-%d",
drm_connector_enum_list[connector_type].name,
connector->connector_type_id);
if (!connector->name) {
ret = -ENOMEM;
goto out_put_type_id;
}
INIT_LIST_HEAD(&connector->probed_modes);
INIT_LIST_HEAD(&connector->modes);
mutex_init(&connector->mutex);
connector->edid_blob_ptr = NULL;
connector->tile_blob_ptr = NULL;
connector->status = connector_status_unknown;
connector->display_info.panel_orientation =
DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
drm_connector_get_cmdline_mode(connector);
/* We should add connectors at the end to avoid upsetting the connector
* index too much. */
spin_lock_irq(&config->connector_list_lock);
list_add_tail(&connector->head, &config->connector_list);
config->num_connector++;
spin_unlock_irq(&config->connector_list_lock);
if (connector_type != DRM_MODE_CONNECTOR_VIRTUAL &&
connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
drm_connector_attach_edid_property(connector);
drm_object_attach_property(&connector->base,
config->dpms_property, 0);
drm_object_attach_property(&connector->base,
config->link_status_property,
0);
drm_object_attach_property(&connector->base,
config->non_desktop_property,
0);
drm_object_attach_property(&connector->base,
config->tile_property,
0);
if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
}
connector->debugfs_entry = NULL;
out_put_type_id:
if (ret)
ida_simple_remove(connector_ida, connector->connector_type_id);
out_put_id:
if (ret)
ida_simple_remove(&config->connector_ida, connector->index);
out_put:
if (ret)
drm_mode_object_unregister(dev, &connector->base);
return ret;
}
EXPORT_SYMBOL(drm_connector_init);
/**
* drm_connector_attach_edid_property - attach edid property.
* @connector: the connector
*
* Some connector types like DRM_MODE_CONNECTOR_VIRTUAL do not get a
* edid property attached by default. This function can be used to
* explicitly enable the edid property in these cases.
*/
void drm_connector_attach_edid_property(struct drm_connector *connector)
{
struct drm_mode_config *config = &connector->dev->mode_config;
drm_object_attach_property(&connector->base,
config->edid_property,
0);
}
EXPORT_SYMBOL(drm_connector_attach_edid_property);
/**
* drm_connector_attach_encoder - attach a connector to an encoder
* @connector: connector to attach
* @encoder: encoder to attach @connector to
*
* This function links up a connector to an encoder. Note that the routing
* restrictions between encoders and crtcs are exposed to userspace through the
* possible_clones and possible_crtcs bitmasks.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_attach_encoder(struct drm_connector *connector,
struct drm_encoder *encoder)
{
int i;
/*
* In the past, drivers have attempted to model the static association
* of connector to encoder in simple connector/encoder devices using a
* direct assignment of connector->encoder = encoder. This connection
* is a logical one and the responsibility of the core, so drivers are
* expected not to mess with this.
*
* Note that the error return should've been enough here, but a large
* majority of drivers ignores the return value, so add in a big WARN
* to get people's attention.
*/
if (WARN_ON(connector->encoder))
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(connector->encoder_ids); i++) {
if (connector->encoder_ids[i] == 0) {
connector->encoder_ids[i] = encoder->base.id;
return 0;
}
}
return -ENOMEM;
}
EXPORT_SYMBOL(drm_connector_attach_encoder);
/**
* drm_connector_has_possible_encoder - check if the connector and encoder are assosicated with each other
* @connector: the connector
* @encoder: the encoder
*
* Returns:
* True if @encoder is one of the possible encoders for @connector.
*/
bool drm_connector_has_possible_encoder(struct drm_connector *connector,
struct drm_encoder *encoder)
{
struct drm_encoder *enc;
int i;
drm_connector_for_each_possible_encoder(connector, enc, i) {
if (enc == encoder)
return true;
}
return false;
}
EXPORT_SYMBOL(drm_connector_has_possible_encoder);
static void drm_mode_remove(struct drm_connector *connector,
struct drm_display_mode *mode)
{
list_del(&mode->head);
drm_mode_destroy(connector->dev, mode);
}
/**
* drm_connector_cleanup - cleans up an initialised connector
* @connector: connector to cleanup
*
* Cleans up the connector but doesn't free the object.
*/
void drm_connector_cleanup(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_display_mode *mode, *t;
/* The connector should have been removed from userspace long before
* it is finally destroyed.
*/
if (WARN_ON(connector->registration_state ==
DRM_CONNECTOR_REGISTERED))
drm_connector_unregister(connector);
if (connector->tile_group) {
drm_mode_put_tile_group(dev, connector->tile_group);
connector->tile_group = NULL;
}
list_for_each_entry_safe(mode, t, &connector->probed_modes, head)
drm_mode_remove(connector, mode);
list_for_each_entry_safe(mode, t, &connector->modes, head)
drm_mode_remove(connector, mode);
ida_simple_remove(&drm_connector_enum_list[connector->connector_type].ida,
connector->connector_type_id);
ida_simple_remove(&dev->mode_config.connector_ida,
connector->index);
kfree(connector->display_info.bus_formats);
drm_mode_object_unregister(dev, &connector->base);
kfree(connector->name);
connector->name = NULL;
spin_lock_irq(&dev->mode_config.connector_list_lock);
list_del(&connector->head);
dev->mode_config.num_connector--;
spin_unlock_irq(&dev->mode_config.connector_list_lock);
WARN_ON(connector->state && !connector->funcs->atomic_destroy_state);
if (connector->state && connector->funcs->atomic_destroy_state)
connector->funcs->atomic_destroy_state(connector,
connector->state);
mutex_destroy(&connector->mutex);
memset(connector, 0, sizeof(*connector));
}
EXPORT_SYMBOL(drm_connector_cleanup);
/**
* drm_connector_register - register a connector
* @connector: the connector to register
*
* Register userspace interfaces for a connector
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_connector_register(struct drm_connector *connector)
{
int ret = 0;
if (!connector->dev->registered)
return 0;
mutex_lock(&connector->mutex);
if (connector->registration_state != DRM_CONNECTOR_INITIALIZING)
goto unlock;
ret = drm_sysfs_connector_add(connector);
if (ret)
goto unlock;
drm_debugfs_connector_add(connector);
if (connector->funcs->late_register) {
ret = connector->funcs->late_register(connector);
if (ret)
goto err_debugfs;
}
drm_mode_object_register(connector->dev, &connector->base);
connector->registration_state = DRM_CONNECTOR_REGISTERED;
goto unlock;
err_debugfs:
drm_debugfs_connector_remove(connector);
drm_sysfs_connector_remove(connector);
unlock:
mutex_unlock(&connector->mutex);
return ret;
}
EXPORT_SYMBOL(drm_connector_register);
/**
* drm_connector_unregister - unregister a connector
* @connector: the connector to unregister
*
* Unregister userspace interfaces for a connector
*/
void drm_connector_unregister(struct drm_connector *connector)
{
mutex_lock(&connector->mutex);
if (connector->registration_state != DRM_CONNECTOR_REGISTERED) {
mutex_unlock(&connector->mutex);
return;
}
if (connector->funcs->early_unregister)
connector->funcs->early_unregister(connector);
drm_sysfs_connector_remove(connector);
drm_debugfs_connector_remove(connector);
connector->registration_state = DRM_CONNECTOR_UNREGISTERED;
mutex_unlock(&connector->mutex);
}
EXPORT_SYMBOL(drm_connector_unregister);
void drm_connector_unregister_all(struct drm_device *dev)
{
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter)
drm_connector_unregister(connector);
drm_connector_list_iter_end(&conn_iter);
}
int drm_connector_register_all(struct drm_device *dev)
{
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
int ret = 0;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
ret = drm_connector_register(connector);
if (ret)
break;
}
drm_connector_list_iter_end(&conn_iter);
if (ret)
drm_connector_unregister_all(dev);
return ret;
}
/**
* drm_get_connector_status_name - return a string for connector status
* @status: connector status to compute name of
*
* In contrast to the other drm_get_*_name functions this one here returns a
* const pointer and hence is threadsafe.
*/
const char *drm_get_connector_status_name(enum drm_connector_status status)
{
if (status == connector_status_connected)
return "connected";
else if (status == connector_status_disconnected)
return "disconnected";
else
return "unknown";
}
EXPORT_SYMBOL(drm_get_connector_status_name);
/**
* drm_get_connector_force_name - return a string for connector force
* @force: connector force to get name of
*
* Returns: const pointer to name.
*/
const char *drm_get_connector_force_name(enum drm_connector_force force)
{
switch (force) {
case DRM_FORCE_UNSPECIFIED:
return "unspecified";
case DRM_FORCE_OFF:
return "off";
case DRM_FORCE_ON:
return "on";
case DRM_FORCE_ON_DIGITAL:
return "digital";
default:
return "unknown";
}
}
#ifdef CONFIG_LOCKDEP
static struct lockdep_map connector_list_iter_dep_map = {
.name = "drm_connector_list_iter"
};
#endif
/**
* drm_connector_list_iter_begin - initialize a connector_list iterator
* @dev: DRM device
* @iter: connector_list iterator
*
* Sets @iter up to walk the &drm_mode_config.connector_list of @dev. @iter
* must always be cleaned up again by calling drm_connector_list_iter_end().
* Iteration itself happens using drm_connector_list_iter_next() or
* drm_for_each_connector_iter().
*/
void drm_connector_list_iter_begin(struct drm_device *dev,
struct drm_connector_list_iter *iter)
{
iter->dev = dev;
iter->conn = NULL;
lock_acquire_shared_recursive(&connector_list_iter_dep_map, 0, 1, NULL, _RET_IP_);
}
EXPORT_SYMBOL(drm_connector_list_iter_begin);
/*
* Extra-safe connector put function that works in any context. Should only be
* used from the connector_iter functions, where we never really expect to
* actually release the connector when dropping our final reference.
*/
static void
__drm_connector_put_safe(struct drm_connector *conn)
{
struct drm_mode_config *config = &conn->dev->mode_config;
lockdep_assert_held(&config->connector_list_lock);
if (!refcount_dec_and_test(&conn->base.refcount.refcount))
return;
llist_add(&conn->free_node, &config->connector_free_list);
schedule_work(&config->connector_free_work);
}
/**
* drm_connector_list_iter_next - return next connector
* @iter: connector_list iterator
*
* Returns the next connector for @iter, or NULL when the list walk has
* completed.
*/
struct drm_connector *
drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
{
struct drm_connector *old_conn = iter->conn;
struct drm_mode_config *config = &iter->dev->mode_config;
struct list_head *lhead;
unsigned long flags;
spin_lock_irqsave(&config->connector_list_lock, flags);
lhead = old_conn ? &old_conn->head : &config->connector_list;
do {
if (lhead->next == &config->connector_list) {
iter->conn = NULL;
break;
}
lhead = lhead->next;
iter->conn = list_entry(lhead, struct drm_connector, head);
/* loop until it's not a zombie connector */
} while (!kref_get_unless_zero(&iter->conn->base.refcount));
if (old_conn)
__drm_connector_put_safe(old_conn);
spin_unlock_irqrestore(&config->connector_list_lock, flags);
return iter->conn;
}
EXPORT_SYMBOL(drm_connector_list_iter_next);
/**
* drm_connector_list_iter_end - tear down a connector_list iterator
* @iter: connector_list iterator
*
* Tears down @iter and releases any resources (like &drm_connector references)
* acquired while walking the list. This must always be called, both when the
* iteration completes fully or when it was aborted without walking the entire
* list.
*/
void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
{
struct drm_mode_config *config = &iter->dev->mode_config;
unsigned long flags;
iter->dev = NULL;
if (iter->conn) {
spin_lock_irqsave(&config->connector_list_lock, flags);
__drm_connector_put_safe(iter->conn);
spin_unlock_irqrestore(&config->connector_list_lock, flags);
}
lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
}
EXPORT_SYMBOL(drm_connector_list_iter_end);
static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
{ SubPixelUnknown, "Unknown" },
{ SubPixelHorizontalRGB, "Horizontal RGB" },
{ SubPixelHorizontalBGR, "Horizontal BGR" },
{ SubPixelVerticalRGB, "Vertical RGB" },
{ SubPixelVerticalBGR, "Vertical BGR" },
{ SubPixelNone, "None" },
};
/**
* drm_get_subpixel_order_name - return a string for a given subpixel enum
* @order: enum of subpixel_order
*
* Note you could abuse this and return something out of bounds, but that
* would be a caller error. No unscrubbed user data should make it here.
*/
const char *drm_get_subpixel_order_name(enum subpixel_order order)
{
return drm_subpixel_enum_list[order].name;
}
EXPORT_SYMBOL(drm_get_subpixel_order_name);
static const struct drm_prop_enum_list drm_dpms_enum_list[] = {
{ DRM_MODE_DPMS_ON, "On" },
{ DRM_MODE_DPMS_STANDBY, "Standby" },
{ DRM_MODE_DPMS_SUSPEND, "Suspend" },
{ DRM_MODE_DPMS_OFF, "Off" }
};
DRM_ENUM_NAME_FN(drm_get_dpms_name, drm_dpms_enum_list)
static const struct drm_prop_enum_list drm_link_status_enum_list[] = {
{ DRM_MODE_LINK_STATUS_GOOD, "Good" },
{ DRM_MODE_LINK_STATUS_BAD, "Bad" },
};
/**
* drm_display_info_set_bus_formats - set the supported bus formats
* @info: display info to store bus formats in
* @formats: array containing the supported bus formats
* @num_formats: the number of entries in the fmts array
*
* Store the supported bus formats in display info structure.
* See MEDIA_BUS_FMT_* definitions in include/uapi/linux/media-bus-format.h for
* a full list of available formats.
*/
int drm_display_info_set_bus_formats(struct drm_display_info *info,
const u32 *formats,
unsigned int num_formats)
{
u32 *fmts = NULL;
if (!formats && num_formats)
return -EINVAL;
if (formats && num_formats) {
fmts = kmemdup(formats, sizeof(*formats) * num_formats,
GFP_KERNEL);
if (!fmts)
return -ENOMEM;
}
kfree(info->bus_formats);
info->bus_formats = fmts;
info->num_bus_formats = num_formats;
return 0;
}
EXPORT_SYMBOL(drm_display_info_set_bus_formats);
/* Optional connector properties. */
static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
{ DRM_MODE_SCALE_NONE, "None" },
{ DRM_MODE_SCALE_FULLSCREEN, "Full" },
{ DRM_MODE_SCALE_CENTER, "Center" },
{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
};
static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
};
static const struct drm_prop_enum_list drm_content_type_enum_list[] = {
{ DRM_MODE_CONTENT_TYPE_NO_DATA, "No Data" },
{ DRM_MODE_CONTENT_TYPE_GRAPHICS, "Graphics" },
{ DRM_MODE_CONTENT_TYPE_PHOTO, "Photo" },
{ DRM_MODE_CONTENT_TYPE_CINEMA, "Cinema" },
{ DRM_MODE_CONTENT_TYPE_GAME, "Game" },
};
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 */
{ DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */
};
DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
{ DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */
{ DRM_MODE_SUBCONNECTOR_DVID, "DVI-D" }, /* DVI-I */
{ DRM_MODE_SUBCONNECTOR_DVIA, "DVI-A" }, /* DVI-I */
};
DRM_ENUM_NAME_FN(drm_get_dvi_i_subconnector_name,
drm_dvi_i_subconnector_enum_list)
static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
{ DRM_MODE_SUBCONNECTOR_Automatic, "Automatic" }, /* DVI-I and TV-out */
{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */
};
DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
{ DRM_MODE_SUBCONNECTOR_Unknown, "Unknown" }, /* DVI-I and TV-out */
{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_SVIDEO, "SVIDEO" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
{ DRM_MODE_SUBCONNECTOR_SCART, "SCART" }, /* TV-out */
};
DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
drm_tv_subconnector_enum_list)
static const struct drm_prop_enum_list hdmi_colorspaces[] = {
/* For Default case, driver will set the colorspace */
{ DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
/* Standard Definition Colorimetry based on CEA 861 */
{ DRM_MODE_COLORIMETRY_SMPTE_170M_YCC, "SMPTE_170M_YCC" },
{ DRM_MODE_COLORIMETRY_BT709_YCC, "BT709_YCC" },
/* Standard Definition Colorimetry based on IEC 61966-2-4 */
{ DRM_MODE_COLORIMETRY_XVYCC_601, "XVYCC_601" },
/* High Definition Colorimetry based on IEC 61966-2-4 */
{ DRM_MODE_COLORIMETRY_XVYCC_709, "XVYCC_709" },
/* Colorimetry based on IEC 61966-2-1/Amendment 1 */
{ DRM_MODE_COLORIMETRY_SYCC_601, "SYCC_601" },
/* Colorimetry based on IEC 61966-2-5 [33] */
{ DRM_MODE_COLORIMETRY_OPYCC_601, "opYCC_601" },
/* Colorimetry based on IEC 61966-2-5 */
{ DRM_MODE_COLORIMETRY_OPRGB, "opRGB" },
/* Colorimetry based on ITU-R BT.2020 */
{ DRM_MODE_COLORIMETRY_BT2020_CYCC, "BT2020_CYCC" },
/* Colorimetry based on ITU-R BT.2020 */
{ DRM_MODE_COLORIMETRY_BT2020_RGB, "BT2020_RGB" },
/* Colorimetry based on ITU-R BT.2020 */
{ DRM_MODE_COLORIMETRY_BT2020_YCC, "BT2020_YCC" },
/* Added as part of Additional Colorimetry Extension in 861.G */
{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_D65, "DCI-P3_RGB_D65" },
{ DRM_MODE_COLORIMETRY_DCI_P3_RGB_THEATER, "DCI-P3_RGB_Theater" },
};
/**
* DOC: standard connector properties
*
* DRM connectors have a few standardized properties:
*
* EDID:
* Blob property which contains the current EDID read from the sink. This
* is useful to parse sink identification information like vendor, model
* and serial. Drivers should update this property by calling
* drm_connector_update_edid_property(), usually after having parsed
* the EDID using drm_add_edid_modes(). Userspace cannot change this
* property.
* DPMS:
* Legacy property for setting the power state of the connector. For atomic
* drivers this is only provided for backwards compatibility with existing
* drivers, it remaps to controlling the "ACTIVE" property on the CRTC the
* connector is linked to. Drivers should never set this property directly,
* it is handled by the DRM core by calling the &drm_connector_funcs.dpms
* callback. For atomic drivers the remapping to the "ACTIVE" property is
* implemented in the DRM core. This is the only standard connector
* property that userspace can change.
*
* Note that this property cannot be set through the MODE_ATOMIC ioctl,
* userspace must use "ACTIVE" on the CRTC instead.
*
* WARNING:
*
* For userspace also running on legacy drivers the "DPMS" semantics are a
* lot more complicated. First, userspace cannot rely on the "DPMS" value
* returned by the GETCONNECTOR actually reflecting reality, because many
* drivers fail to update it. For atomic drivers this is taken care of in
* drm_atomic_helper_update_legacy_modeset_state().
*
* The second issue is that the DPMS state is only well-defined when the
* connector is connected to a CRTC. In atomic the DRM core enforces that
* "ACTIVE" is off in such a case, no such checks exists for "DPMS".
*
* Finally, when enabling an output using the legacy SETCONFIG ioctl then
* "DPMS" is forced to ON. But see above, that might not be reflected in
* the software value on legacy drivers.
*
* Summarizing: Only set "DPMS" when the connector is known to be enabled,
* assume that a successful SETCONFIG call also sets "DPMS" to on, and
* never read back the value of "DPMS" because it can be incorrect.
* PATH:
* Connector path property to identify how this sink is physically
* connected. Used by DP MST. This should be set by calling
* drm_connector_set_path_property(), in the case of DP MST with the
* path property the MST manager created. Userspace cannot change this
* property.
* TILE:
* Connector tile group property to indicate how a set of DRM connector
* compose together into one logical screen. This is used by both high-res
* external screens (often only using a single cable, but exposing multiple
* DP MST sinks), or high-res integrated panels (like dual-link DSI) which
* are not gen-locked. Note that for tiled panels which are genlocked, like
* dual-link LVDS or dual-link DSI, the driver should try to not expose the
* tiling and virtualize both &drm_crtc and &drm_plane if needed. Drivers
* should update this value using drm_connector_set_tile_property().
* Userspace cannot change this property.
* link-status:
* Connector link-status property to indicate the status of link. The
* default value of link-status is "GOOD". If something fails during or
* after modeset, the kernel driver may set this to "BAD" and issue a
* hotplug uevent. Drivers should update this value using
* drm_connector_set_link_status_property().
* non_desktop:
* Indicates the output should be ignored for purposes of displaying a
* standard desktop environment or console. This is most likely because
* the output device is not rectilinear.
* Content Protection:
* This property is used by userspace to request the kernel protect future
* content communicated over the link. When requested, kernel will apply
* the appropriate means of protection (most often HDCP), and use the
* property to tell userspace the protection is active.
*
* Drivers can set this up by calling
* drm_connector_attach_content_protection_property() on initialization.
*
* The value of this property can be one of the following:
*
* DRM_MODE_CONTENT_PROTECTION_UNDESIRED = 0
* The link is not protected, content is transmitted in the clear.
* DRM_MODE_CONTENT_PROTECTION_DESIRED = 1
* Userspace has requested content protection, but the link is not
* currently protected. When in this state, kernel should enable
* Content Protection as soon as possible.
* DRM_MODE_CONTENT_PROTECTION_ENABLED = 2
* Userspace has requested content protection, and the link is
* protected. Only the driver can set the property to this value.
* If userspace attempts to set to ENABLED, kernel will return
* -EINVAL.
*
* A few guidelines:
*
* - DESIRED state should be preserved until userspace de-asserts it by
* setting the property to UNDESIRED. This means ENABLED should only
* transition to UNDESIRED when the user explicitly requests it.
* - If the state is DESIRED, kernel should attempt to re-authenticate the
* link whenever possible. This includes across disable/enable, dpms,
* hotplug, downstream device changes, link status failures, etc..
* - Userspace is responsible for polling the property to determine when
* the value transitions from ENABLED to DESIRED. This signifies the link
* is no longer protected and userspace should take appropriate action
* (whatever that might be).
*
* HDR_OUTPUT_METADATA:
* Connector property to enable userspace to send HDR Metadata to
* driver. This metadata is based on the composition and blending
* policies decided by user, taking into account the hardware and
* sink capabilities. The driver gets this metadata and creates a
* Dynamic Range and Mastering Infoframe (DRM) in case of HDMI,
* SDP packet (Non-audio INFOFRAME SDP v1.3) for DP. This is then
* sent to sink. This notifies the sink of the upcoming frame's Color
* Encoding and Luminance parameters.
*
* Userspace first need to detect the HDR capabilities of sink by
* reading and parsing the EDID. Details of HDR metadata for HDMI
* are added in CTA 861.G spec. For DP , its defined in VESA DP
* Standard v1.4. It needs to then get the metadata information
* of the video/game/app content which are encoded in HDR (basically
* using HDR transfer functions). With this information it needs to
* decide on a blending policy and compose the relevant
* layers/overlays into a common format. Once this blending is done,
* userspace will be aware of the metadata of the composed frame to
* be send to sink. It then uses this property to communicate this
* metadata to driver which then make a Infoframe packet and sends
* to sink based on the type of encoder connected.
*
* Userspace will be responsible to do Tone mapping operation in case:
* - Some layers are HDR and others are SDR
* - HDR layers luminance is not same as sink
*
* It will even need to do colorspace conversion and get all layers
* to one common colorspace for blending. It can use either GL, Media
* or display engine to get this done based on the capabilties of the
* associated hardware.
*
* Driver expects metadata to be put in &struct hdr_output_metadata
* structure from userspace. This is received as blob and stored in
* &drm_connector_state.hdr_output_metadata. It parses EDID and saves the
* sink metadata in &struct hdr_sink_metadata, as
* &drm_connector.hdr_sink_metadata. Driver uses
* drm_hdmi_infoframe_set_hdr_metadata() helper to set the HDR metadata,
* hdmi_drm_infoframe_pack() to pack the infoframe as per spec, in case of
* HDMI encoder.
*
* max bpc:
* This range property is used by userspace to limit the bit depth. When
* used the driver would limit the bpc in accordance with the valid range
* supported by the hardware and sink. Drivers to use the function
* drm_connector_attach_max_bpc_property() to create and attach the
* property to the connector during initialization.
*
* Connectors also have one standardized atomic property:
*
* 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. This property is initialized by calling
* drm_connector_init_panel_orientation_property().
*
* scaling mode:
* This property defines how a non-native mode is upscaled to the native
* mode of an LCD panel:
*
* None:
* No upscaling happens, scaling is left to the panel. Not all
* drivers expose this mode.
* Full:
* The output is upscaled to the full resolution of the panel,
* ignoring the aspect ratio.
* Center:
* No upscaling happens, the output is centered within the native
* resolution the panel.
* Full aspect:
* The output is upscaled to maximize either the width or height
* while retaining the aspect ratio.
*
* This property should be set up by calling
* drm_connector_attach_scaling_mode_property(). Note that drivers
* can also expose this property to external outputs, in which case they
* must support "None", which should be the default (since external screens
* have a built-in scaler).
*/
int drm_connector_create_standard_properties(struct drm_device *dev)
{
struct drm_property *prop;
prop = drm_property_create(dev, DRM_MODE_PROP_BLOB |
DRM_MODE_PROP_IMMUTABLE,
"EDID", 0);
if (!prop)
return -ENOMEM;
dev->mode_config.edid_property = prop;
prop = drm_property_create_enum(dev, 0,
"DPMS", drm_dpms_enum_list,
ARRAY_SIZE(drm_dpms_enum_list));
if (!prop)
return -ENOMEM;
dev->mode_config.dpms_property = prop;
prop = drm_property_create(dev,
DRM_MODE_PROP_BLOB |
DRM_MODE_PROP_IMMUTABLE,
"PATH", 0);
if (!prop)
return -ENOMEM;
dev->mode_config.path_property = prop;
prop = drm_property_create(dev,
DRM_MODE_PROP_BLOB |
DRM_MODE_PROP_IMMUTABLE,
"TILE", 0);
if (!prop)
return -ENOMEM;
dev->mode_config.tile_property = prop;
prop = drm_property_create_enum(dev, 0, "link-status",
drm_link_status_enum_list,
ARRAY_SIZE(drm_link_status_enum_list));
if (!prop)
return -ENOMEM;
dev->mode_config.link_status_property = prop;
prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop");
if (!prop)
return -ENOMEM;
dev->mode_config.non_desktop_property = prop;
prop = drm_property_create(dev, DRM_MODE_PROP_BLOB,
"HDR_OUTPUT_METADATA", 0);
if (!prop)
return -ENOMEM;
dev->mode_config.hdr_output_metadata_property = prop;
return 0;
}
/**
* drm_mode_create_dvi_i_properties - create DVI-I specific connector properties
* @dev: DRM device
*
* Called by a driver the first time a DVI-I connector is made.
*/
int drm_mode_create_dvi_i_properties(struct drm_device *dev)
{
struct drm_property *dvi_i_selector;
struct drm_property *dvi_i_subconnector;
if (dev->mode_config.dvi_i_select_subconnector_property)
return 0;
dvi_i_selector =
drm_property_create_enum(dev, 0,
"select subconnector",
drm_dvi_i_select_enum_list,
ARRAY_SIZE(drm_dvi_i_select_enum_list));
dev->mode_config.dvi_i_select_subconnector_property = dvi_i_selector;
dvi_i_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
"subconnector",
drm_dvi_i_subconnector_enum_list,
ARRAY_SIZE(drm_dvi_i_subconnector_enum_list));
dev->mode_config.dvi_i_subconnector_property = dvi_i_subconnector;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
/**
* DOC: HDMI connector properties
*
* content type (HDMI specific):
* Indicates content type setting to be used in HDMI infoframes to indicate
* content type for the external device, so that it adjusts its display
* settings accordingly.
*
* The value of this property can be one of the following:
*
* No Data:
* Content type is unknown
* Graphics:
* Content type is graphics
* Photo:
* Content type is photo
* Cinema:
* Content type is cinema
* Game:
* Content type is game
*
* Drivers can set up this property by calling
* drm_connector_attach_content_type_property(). Decoding to
* infoframe values is done through drm_hdmi_avi_infoframe_content_type().
*/
/**
* drm_connector_attach_content_type_property - attach content-type property
* @connector: connector to attach content type property on.
*
* Called by a driver the first time a HDMI connector is made.
*/
int drm_connector_attach_content_type_property(struct drm_connector *connector)
{
if (!drm_mode_create_content_type_property(connector->dev))
drm_object_attach_property(&connector->base,
connector->dev->mode_config.content_type_property,
DRM_MODE_CONTENT_TYPE_NO_DATA);
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_content_type_property);
/**
* drm_hdmi_avi_infoframe_content_type() - fill the HDMI AVI infoframe
* content type information, based
* on correspondent DRM property.
* @frame: HDMI AVI infoframe
* @conn_state: DRM display connector state
*
*/
void drm_hdmi_avi_infoframe_content_type(struct hdmi_avi_infoframe *frame,
const struct drm_connector_state *conn_state)
{
switch (conn_state->content_type) {
case DRM_MODE_CONTENT_TYPE_GRAPHICS:
frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
break;
case DRM_MODE_CONTENT_TYPE_CINEMA:
frame->content_type = HDMI_CONTENT_TYPE_CINEMA;
break;
case DRM_MODE_CONTENT_TYPE_GAME:
frame->content_type = HDMI_CONTENT_TYPE_GAME;
break;
case DRM_MODE_CONTENT_TYPE_PHOTO:
frame->content_type = HDMI_CONTENT_TYPE_PHOTO;
break;
default:
/* Graphics is the default(0) */
frame->content_type = HDMI_CONTENT_TYPE_GRAPHICS;
}
frame->itc = conn_state->content_type != DRM_MODE_CONTENT_TYPE_NO_DATA;
}
EXPORT_SYMBOL(drm_hdmi_avi_infoframe_content_type);
/**
* drm_mode_attach_tv_margin_properties - attach TV connector margin properties
* @connector: DRM connector
*
* Called by a driver when it needs to attach TV margin props to a connector.
* Typically used on SDTV and HDMI connectors.
*/
void drm_connector_attach_tv_margin_properties(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
drm_object_attach_property(&connector->base,
dev->mode_config.tv_left_margin_property,
0);
drm_object_attach_property(&connector->base,
dev->mode_config.tv_right_margin_property,
0);
drm_object_attach_property(&connector->base,
dev->mode_config.tv_top_margin_property,
0);
drm_object_attach_property(&connector->base,
dev->mode_config.tv_bottom_margin_property,
0);
}
EXPORT_SYMBOL(drm_connector_attach_tv_margin_properties);
/**
* drm_mode_create_tv_margin_properties - create TV connector margin properties
* @dev: DRM device
*
* Called by a driver's HDMI connector initialization routine, this function
* creates the TV margin properties for a given device. No need to call this
* function for an SDTV connector, it's already called from
* drm_mode_create_tv_properties().
*/
int drm_mode_create_tv_margin_properties(struct drm_device *dev)
{
if (dev->mode_config.tv_left_margin_property)
return 0;
dev->mode_config.tv_left_margin_property =
drm_property_create_range(dev, 0, "left margin", 0, 100);
if (!dev->mode_config.tv_left_margin_property)
return -ENOMEM;
dev->mode_config.tv_right_margin_property =
drm_property_create_range(dev, 0, "right margin", 0, 100);
if (!dev->mode_config.tv_right_margin_property)
return -ENOMEM;
dev->mode_config.tv_top_margin_property =
drm_property_create_range(dev, 0, "top margin", 0, 100);
if (!dev->mode_config.tv_top_margin_property)
return -ENOMEM;
dev->mode_config.tv_bottom_margin_property =
drm_property_create_range(dev, 0, "bottom margin", 0, 100);
if (!dev->mode_config.tv_bottom_margin_property)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_tv_margin_properties);
/**
* drm_mode_create_tv_properties - create TV specific connector properties
* @dev: DRM device
* @num_modes: number of different TV formats (modes) supported
* @modes: array of pointers to strings containing name of each format
*
* Called by a driver's TV initialization routine, this function creates
* the TV specific connector properties for a given device. Caller is
* responsible for allocating a list of format names and passing them to
* this routine.
*/
int drm_mode_create_tv_properties(struct drm_device *dev,
unsigned int num_modes,
const char * const modes[])
{
struct drm_property *tv_selector;
struct drm_property *tv_subconnector;
unsigned int i;
if (dev->mode_config.tv_select_subconnector_property)
return 0;
/*
* Basic connector properties
*/
tv_selector = drm_property_create_enum(dev, 0,
"select subconnector",
drm_tv_select_enum_list,
ARRAY_SIZE(drm_tv_select_enum_list));
if (!tv_selector)
goto nomem;
dev->mode_config.tv_select_subconnector_property = tv_selector;
tv_subconnector =
drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
"subconnector",
drm_tv_subconnector_enum_list,
ARRAY_SIZE(drm_tv_subconnector_enum_list));
if (!tv_subconnector)
goto nomem;
dev->mode_config.tv_subconnector_property = tv_subconnector;
/*
* Other, TV specific properties: margins & TV modes.
*/
if (drm_mode_create_tv_margin_properties(dev))
goto nomem;
dev->mode_config.tv_mode_property =
drm_property_create(dev, DRM_MODE_PROP_ENUM,
"mode", num_modes);
if (!dev->mode_config.tv_mode_property)
goto nomem;
for (i = 0; i < num_modes; i++)
drm_property_add_enum(dev->mode_config.tv_mode_property,
i, modes[i]);
dev->mode_config.tv_brightness_property =
drm_property_create_range(dev, 0, "brightness", 0, 100);
if (!dev->mode_config.tv_brightness_property)
goto nomem;
dev->mode_config.tv_contrast_property =
drm_property_create_range(dev, 0, "contrast", 0, 100);
if (!dev->mode_config.tv_contrast_property)
goto nomem;
dev->mode_config.tv_flicker_reduction_property =
drm_property_create_range(dev, 0, "flicker reduction", 0, 100);
if (!dev->mode_config.tv_flicker_reduction_property)
goto nomem;
dev->mode_config.tv_overscan_property =
drm_property_create_range(dev, 0, "overscan", 0, 100);
if (!dev->mode_config.tv_overscan_property)
goto nomem;
dev->mode_config.tv_saturation_property =
drm_property_create_range(dev, 0, "saturation", 0, 100);
if (!dev->mode_config.tv_saturation_property)
goto nomem;
dev->mode_config.tv_hue_property =
drm_property_create_range(dev, 0, "hue", 0, 100);
if (!dev->mode_config.tv_hue_property)
goto nomem;
return 0;
nomem:
return -ENOMEM;
}
EXPORT_SYMBOL(drm_mode_create_tv_properties);
/**
* drm_mode_create_scaling_mode_property - create scaling mode property
* @dev: DRM device
*
* Called by a driver the first time it's needed, must be attached to desired
* connectors.
*
* Atomic drivers should use drm_connector_attach_scaling_mode_property()
* instead to correctly assign &drm_connector_state.picture_aspect_ratio
* in the atomic state.
*/
int drm_mode_create_scaling_mode_property(struct drm_device *dev)
{
struct drm_property *scaling_mode;
if (dev->mode_config.scaling_mode_property)
return 0;
scaling_mode =
drm_property_create_enum(dev, 0, "scaling mode",
drm_scaling_mode_enum_list,
ARRAY_SIZE(drm_scaling_mode_enum_list));
dev->mode_config.scaling_mode_property = scaling_mode;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
/**
* DOC: Variable refresh properties
*
* Variable refresh rate capable displays can dynamically adjust their
* refresh rate by extending the duration of their vertical front porch
* until page flip or timeout occurs. This can reduce or remove stuttering
* and latency in scenarios where the page flip does not align with the
* vblank interval.
*
* An example scenario would be an application flipping at a constant rate
* of 48Hz on a 60Hz display. The page flip will frequently miss the vblank
* interval and the same contents will be displayed twice. This can be
* observed as stuttering for content with motion.
*
* If variable refresh rate was active on a display that supported a
* variable refresh range from 35Hz to 60Hz no stuttering would be observable
* for the example scenario. The minimum supported variable refresh rate of
* 35Hz is below the page flip frequency and the vertical front porch can
* be extended until the page flip occurs. The vblank interval will be
* directly aligned to the page flip rate.
*
* Not all userspace content is suitable for use with variable refresh rate.
* Large and frequent changes in vertical front porch duration may worsen
* perceived stuttering for input sensitive applications.
*
* Panel brightness will also vary with vertical front porch duration. Some
* panels may have noticeable differences in brightness between the minimum
* vertical front porch duration and the maximum vertical front porch duration.
* Large and frequent changes in vertical front porch duration may produce
* observable flickering for such panels.
*
* Userspace control for variable refresh rate is supported via properties
* on the &drm_connector and &drm_crtc objects.
*
* "vrr_capable":
* Optional &drm_connector boolean property that drivers should attach
* with drm_connector_attach_vrr_capable_property() on connectors that
* could support variable refresh rates. Drivers should update the
* property value by calling drm_connector_set_vrr_capable_property().
*
* Absence of the property should indicate absence of support.
*
* "VRR_ENABLED":
* Default &drm_crtc boolean property that notifies the driver that the
* content on the CRTC is suitable for variable refresh rate presentation.
* The driver will take this property as a hint to enable variable
* refresh rate support if the receiver supports it, ie. if the
* "vrr_capable" property is true on the &drm_connector object. The
* vertical front porch duration will be extended until page-flip or
* timeout when enabled.
*
* The minimum vertical front porch duration is defined as the vertical
* front porch duration for the current mode.
*
* The maximum vertical front porch duration is greater than or equal to
* the minimum vertical front porch duration. The duration is derived
* from the minimum supported variable refresh rate for the connector.
*
* The driver may place further restrictions within these minimum
* and maximum bounds.
*/
/**
* drm_connector_attach_vrr_capable_property - creates the
* vrr_capable property
* @connector: connector to create the vrr_capable property on.
*
* This is used by atomic drivers to add support for querying
* variable refresh rate capability for a connector.
*
* Returns:
* Zero on success, negative errono on failure.
*/
int drm_connector_attach_vrr_capable_property(
struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_property *prop;
if (!connector->vrr_capable_property) {
prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE,
"vrr_capable");
if (!prop)
return -ENOMEM;
connector->vrr_capable_property = prop;
drm_object_attach_property(&connector->base, prop, 0);
}
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_vrr_capable_property);
/**
* drm_connector_attach_scaling_mode_property - attach atomic scaling mode property
* @connector: connector to attach scaling mode property on.
* @scaling_mode_mask: or'ed mask of BIT(%DRM_MODE_SCALE_\*).
*
* This is used to add support for scaling mode to atomic drivers.
* The scaling mode will be set to &drm_connector_state.picture_aspect_ratio
* and can be used from &drm_connector_helper_funcs->atomic_check for validation.
*
* This is the atomic version of drm_mode_create_scaling_mode_property().
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
u32 scaling_mode_mask)
{
struct drm_device *dev = connector->dev;
struct drm_property *scaling_mode_property;
int i;
const unsigned valid_scaling_mode_mask =
(1U << ARRAY_SIZE(drm_scaling_mode_enum_list)) - 1;
if (WARN_ON(hweight32(scaling_mode_mask) < 2 ||
scaling_mode_mask & ~valid_scaling_mode_mask))
return -EINVAL;
scaling_mode_property =
drm_property_create(dev, DRM_MODE_PROP_ENUM, "scaling mode",
hweight32(scaling_mode_mask));
if (!scaling_mode_property)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(drm_scaling_mode_enum_list); i++) {
int ret;
if (!(BIT(i) & scaling_mode_mask))
continue;
ret = drm_property_add_enum(scaling_mode_property,
drm_scaling_mode_enum_list[i].type,
drm_scaling_mode_enum_list[i].name);
if (ret) {
drm_property_destroy(dev, scaling_mode_property);
return ret;
}
}
drm_object_attach_property(&connector->base,
scaling_mode_property, 0);
connector->scaling_mode_property = scaling_mode_property;
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_scaling_mode_property);
/**
* drm_mode_create_aspect_ratio_property - create aspect ratio property
* @dev: DRM device
*
* Called by a driver the first time it's needed, must be attached to desired
* connectors.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
{
if (dev->mode_config.aspect_ratio_property)
return 0;
dev->mode_config.aspect_ratio_property =
drm_property_create_enum(dev, 0, "aspect ratio",
drm_aspect_ratio_enum_list,
ARRAY_SIZE(drm_aspect_ratio_enum_list));
if (dev->mode_config.aspect_ratio_property == NULL)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
/**
* DOC: standard connector properties
*
* Colorspace:
* drm_mode_create_colorspace_property - create colorspace property
* This property helps select a suitable colorspace based on the sink
* capability. Modern sink devices support wider gamut like BT2020.
* This helps switch to BT2020 mode if the BT2020 encoded video stream
* is being played by the user, same for any other colorspace. Thereby
* giving a good visual experience to users.
*
* The expectation from userspace is that it should parse the EDID
* and get supported colorspaces. Use this property and switch to the
* one supported. Sink supported colorspaces should be retrieved by
* userspace from EDID and driver will not explicitly expose them.
*
* Basically the expectation from userspace is:
* - Set up CRTC DEGAMMA/CTM/GAMMA to convert to some sink
* colorspace
* - Set this new property to let the sink know what it
* converted the CRTC output to.
* - This property is just to inform sink what colorspace
* source is trying to drive.
*
* Called by a driver the first time it's needed, must be attached to desired
* connectors.
*/
int drm_mode_create_colorspace_property(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct drm_property *prop;
if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) {
prop = drm_property_create_enum(dev, DRM_MODE_PROP_ENUM,
"Colorspace",
hdmi_colorspaces,
ARRAY_SIZE(hdmi_colorspaces));
if (!prop)
return -ENOMEM;
} else {
DRM_DEBUG_KMS("Colorspace property not supported\n");
return 0;
}
connector->colorspace_property = prop;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_colorspace_property);
/**
* drm_mode_create_content_type_property - create content type property
* @dev: DRM device
*
* Called by a driver the first time it's needed, must be attached to desired
* connectors.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_create_content_type_property(struct drm_device *dev)
{
if (dev->mode_config.content_type_property)
return 0;
dev->mode_config.content_type_property =
drm_property_create_enum(dev, 0, "content type",
drm_content_type_enum_list,
ARRAY_SIZE(drm_content_type_enum_list));
if (dev->mode_config.content_type_property == NULL)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_content_type_property);
/**
* drm_mode_create_suggested_offset_properties - create suggests offset properties
* @dev: DRM device
*
* Create the the suggested x/y offset property for connectors.
*/
int drm_mode_create_suggested_offset_properties(struct drm_device *dev)
{
if (dev->mode_config.suggested_x_property && dev->mode_config.suggested_y_property)
return 0;
dev->mode_config.suggested_x_property =
drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested X", 0, 0xffffffff);
dev->mode_config.suggested_y_property =
drm_property_create_range(dev, DRM_MODE_PROP_IMMUTABLE, "suggested Y", 0, 0xffffffff);
if (dev->mode_config.suggested_x_property == NULL ||
dev->mode_config.suggested_y_property == NULL)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL(drm_mode_create_suggested_offset_properties);
/**
* drm_connector_set_path_property - set tile property on connector
* @connector: connector to set property on.
* @path: path to use for property; must not be NULL.
*
* This creates a property to expose to userspace to specify a
* connector path. This is mainly used for DisplayPort MST where
* connectors have a topology and we want to allow userspace to give
* them more meaningful names.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_set_path_property(struct drm_connector *connector,
const char *path)
{
struct drm_device *dev = connector->dev;
int ret;
ret = drm_property_replace_global_blob(dev,
&connector->path_blob_ptr,
strlen(path) + 1,
path,
&connector->base,
dev->mode_config.path_property);
return ret;
}
EXPORT_SYMBOL(drm_connector_set_path_property);
/**
* drm_connector_set_tile_property - set tile property on connector
* @connector: connector to set property on.
*
* This looks up the tile information for a connector, and creates a
* property for userspace to parse if it exists. The property is of
* the form of 8 integers using ':' as a separator.
* This is used for dual port tiled displays with DisplayPort SST
* or DisplayPort MST connectors.
*
* Returns:
* Zero on success, errno on failure.
*/
int drm_connector_set_tile_property(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
char tile[256];
int ret;
if (!connector->has_tile) {
ret = drm_property_replace_global_blob(dev,
&connector->tile_blob_ptr,
0,
NULL,
&connector->base,
dev->mode_config.tile_property);
return ret;
}
snprintf(tile, 256, "%d:%d:%d:%d:%d:%d:%d:%d",
connector->tile_group->id, connector->tile_is_single_monitor,
connector->num_h_tile, connector->num_v_tile,
connector->tile_h_loc, connector->tile_v_loc,
connector->tile_h_size, connector->tile_v_size);
ret = drm_property_replace_global_blob(dev,
&connector->tile_blob_ptr,
strlen(tile) + 1,
tile,
&connector->base,
dev->mode_config.tile_property);
return ret;
}
EXPORT_SYMBOL(drm_connector_set_tile_property);
/**
* drm_connector_update_edid_property - update the edid property of a connector
* @connector: drm connector
* @edid: new value of the edid property
*
* This function creates a new blob modeset object and assigns its id to the
* connector's edid property.
* Since we also parse tile information from EDID's displayID block, we also
* set the connector's tile property here. See drm_connector_set_tile_property()
* for more details.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_update_edid_property(struct drm_connector *connector,
const struct edid *edid)
{
struct drm_device *dev = connector->dev;
size_t size = 0;
int ret;
/* ignore requests to set edid when overridden */
if (connector->override_edid)
return 0;
if (edid)
size = EDID_LENGTH * (1 + edid->extensions);
/* Set the display info, using edid if available, otherwise
* reseting the values to defaults. This duplicates the work
* done in drm_add_edid_modes, but that function is not
* consistently called before this one in all drivers and the
* computation is cheap enough that it seems better to
* duplicate it rather than attempt to ensure some arbitrary
* ordering of calls.
*/
if (edid)
drm_add_display_info(connector, edid);
else
drm_reset_display_info(connector);
drm_object_property_set_value(&connector->base,
dev->mode_config.non_desktop_property,
connector->display_info.non_desktop);
ret = drm_property_replace_global_blob(dev,
&connector->edid_blob_ptr,
size,
edid,
&connector->base,
dev->mode_config.edid_property);
if (ret)
return ret;
return drm_connector_set_tile_property(connector);
}
EXPORT_SYMBOL(drm_connector_update_edid_property);
/**
* drm_connector_set_link_status_property - Set link status property of a connector
* @connector: drm connector
* @link_status: new value of link status property (0: Good, 1: Bad)
*
* In usual working scenario, this link status property will always be set to
* "GOOD". If something fails during or after a mode set, the kernel driver
* may set this link status property to "BAD". The caller then needs to send a
* hotplug uevent for userspace to re-check the valid modes through
* GET_CONNECTOR_IOCTL and retry modeset.
*
* Note: Drivers cannot rely on userspace to support this property and
* issue a modeset. As such, they may choose to handle issues (like
* re-training a link) without userspace's intervention.
*
* The reason for adding this property is to handle link training failures, but
* it is not limited to DP or link training. For example, if we implement
* asynchronous setcrtc, this property can be used to report any failures in that.
*/
void drm_connector_set_link_status_property(struct drm_connector *connector,
uint64_t link_status)
{
struct drm_device *dev = connector->dev;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
connector->state->link_status = link_status;
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
EXPORT_SYMBOL(drm_connector_set_link_status_property);
/**
* drm_connector_attach_max_bpc_property - attach "max bpc" property
* @connector: connector to attach max bpc property on.
* @min: The minimum bit depth supported by the connector.
* @max: The maximum bit depth supported by the connector.
*
* This is used to add support for limiting the bit depth on a connector.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
int min, int max)
{
struct drm_device *dev = connector->dev;
struct drm_property *prop;
prop = connector->max_bpc_property;
if (!prop) {
prop = drm_property_create_range(dev, 0, "max bpc", min, max);
if (!prop)
return -ENOMEM;
connector->max_bpc_property = prop;
}
drm_object_attach_property(&connector->base, prop, max);
connector->state->max_requested_bpc = max;
connector->state->max_bpc = max;
return 0;
}
EXPORT_SYMBOL(drm_connector_attach_max_bpc_property);
/**
* drm_connector_set_vrr_capable_property - sets the variable refresh rate
* capable property for a connector
* @connector: drm connector
* @capable: True if the connector is variable refresh rate capable
*
* Should be used by atomic drivers to update the indicated support for
* variable refresh rate over a connector.
*/
void drm_connector_set_vrr_capable_property(
struct drm_connector *connector, bool capable)
{
drm_object_property_set_value(&connector->base,
connector->vrr_capable_property,
capable);
}
EXPORT_SYMBOL(drm_connector_set_vrr_capable_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;
int orientation_quirk;
orientation_quirk = drm_get_panel_orientation_quirk(width, height);
if (orientation_quirk != DRM_MODE_PANEL_ORIENTATION_UNKNOWN)
info->panel_orientation = orientation_quirk;
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_connector_set_obj_prop(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t value)
{
int ret = -EINVAL;
struct drm_connector *connector = obj_to_connector(obj);
/* Do DPMS ourselves */
if (property == connector->dev->mode_config.dpms_property) {
ret = (*connector->funcs->dpms)(connector, (int)value);
} else if (connector->funcs->set_property)
ret = connector->funcs->set_property(connector, property, value);
if (!ret)
drm_object_property_set_value(&connector->base, property, value);
return ret;
}
int drm_connector_property_set_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_connector_set_property *conn_set_prop = data;
struct drm_mode_obj_set_property obj_set_prop = {
.value = conn_set_prop->value,
.prop_id = conn_set_prop->prop_id,
.obj_id = conn_set_prop->connector_id,
.obj_type = DRM_MODE_OBJECT_CONNECTOR
};
/* It does all the locking and checking we need */
return drm_mode_obj_set_property_ioctl(dev, &obj_set_prop, file_priv);
}
static struct drm_encoder *drm_connector_get_encoder(struct drm_connector *connector)
{
/* For atomic drivers only state objects are synchronously updated and
* protected by modeset locks, so check those first. */
if (connector->state)
return connector->state->best_encoder;
return connector->encoder;
}
static bool
drm_mode_expose_to_userspace(const struct drm_display_mode *mode,
const struct list_head *export_list,
const struct drm_file *file_priv)
{
/*
* If user-space hasn't configured the driver to expose the stereo 3D
* modes, don't expose them.
*/
if (!file_priv->stereo_allowed && drm_mode_is_stereo(mode))
return false;
/*
* If user-space hasn't configured the driver to expose the modes
* with aspect-ratio, don't expose them. However if such a mode
* is unique, let it be exposed, but reset the aspect-ratio flags
* while preparing the list of user-modes.
*/
if (!file_priv->aspect_ratio_allowed) {
struct drm_display_mode *mode_itr;
list_for_each_entry(mode_itr, export_list, export_head)
if (drm_mode_match(mode_itr, mode,
DRM_MODE_MATCH_TIMINGS |
DRM_MODE_MATCH_CLOCK |
DRM_MODE_MATCH_FLAGS |
DRM_MODE_MATCH_3D_FLAGS))
return false;
}
return true;
}
int drm_mode_getconnector(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_mode_get_connector *out_resp = data;
struct drm_connector *connector;
struct drm_encoder *encoder;
struct drm_display_mode *mode;
int mode_count = 0;
int encoders_count = 0;
int ret = 0;
int copied = 0;
int i;
struct drm_mode_modeinfo u_mode;
struct drm_mode_modeinfo __user *mode_ptr;
uint32_t __user *encoder_ptr;
LIST_HEAD(export_list);
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
if (!connector)
return -ENOENT;
drm_connector_for_each_possible_encoder(connector, encoder, i)
encoders_count++;
if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
copied = 0;
encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
drm_connector_for_each_possible_encoder(connector, encoder, i) {
if (put_user(encoder->base.id, encoder_ptr + copied)) {
ret = -EFAULT;
goto out;
}
copied++;
}
}
out_resp->count_encoders = encoders_count;
out_resp->connector_id = connector->base.id;
out_resp->connector_type = connector->connector_type;
out_resp->connector_type_id = connector->connector_type_id;
mutex_lock(&dev->mode_config.mutex);
if (out_resp->count_modes == 0) {
connector->funcs->fill_modes(connector,
dev->mode_config.max_width,
dev->mode_config.max_height);
}
out_resp->mm_width = connector->display_info.width_mm;
out_resp->mm_height = connector->display_info.height_mm;
out_resp->subpixel = connector->display_info.subpixel_order;
out_resp->connection = connector->status;
/* delayed so we get modes regardless of pre-fill_modes state */
list_for_each_entry(mode, &connector->modes, head)
if (drm_mode_expose_to_userspace(mode, &export_list,
file_priv)) {
list_add_tail(&mode->export_head, &export_list);
mode_count++;
}
/*
* This ioctl is called twice, once to determine how much space is
* needed, and the 2nd time to fill it.
* The modes that need to be exposed to the user are maintained in the
* 'export_list'. When the ioctl is called first time to determine the,
* space, the export_list gets filled, to find the no.of modes. In the
* 2nd time, the user modes are filled, one by one from the export_list.
*/
if ((out_resp->count_modes >= mode_count) && mode_count) {
copied = 0;
mode_ptr = (struct drm_mode_modeinfo __user *)(unsigned long)out_resp->modes_ptr;
list_for_each_entry(mode, &export_list, export_head) {
drm_mode_convert_to_umode(&u_mode, mode);
/*
* Reset aspect ratio flags of user-mode, if modes with
* aspect-ratio are not supported.
*/
if (!file_priv->aspect_ratio_allowed)
u_mode.flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
if (copy_to_user(mode_ptr + copied,
&u_mode, sizeof(u_mode))) {
ret = -EFAULT;
mutex_unlock(&dev->mode_config.mutex);
goto out;
}
copied++;
}
}
out_resp->count_modes = mode_count;
mutex_unlock(&dev->mode_config.mutex);
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
encoder = drm_connector_get_encoder(connector);
if (encoder)
out_resp->encoder_id = encoder->base.id;
else
out_resp->encoder_id = 0;
/* Only grab properties after probing, to make sure EDID and other
* properties reflect the latest status. */
ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic,
(uint32_t __user *)(unsigned long)(out_resp->props_ptr),
(uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr),
&out_resp->count_props);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
out:
drm_connector_put(connector);
return ret;
}
/**
* DOC: Tile group
*
* Tile groups are used to represent tiled monitors with a unique integer
* identifier. Tiled monitors using DisplayID v1.3 have a unique 8-byte handle,
* we store this in a tile group, so we have a common identifier for all tiles
* in a monitor group. The property is called "TILE". Drivers can manage tile
* groups using drm_mode_create_tile_group(), drm_mode_put_tile_group() and
* drm_mode_get_tile_group(). But this is only needed for internal panels where
* the tile group information is exposed through a non-standard way.
*/
static void drm_tile_group_free(struct kref *kref)
{
struct drm_tile_group *tg = container_of(kref, struct drm_tile_group, refcount);
struct drm_device *dev = tg->dev;
mutex_lock(&dev->mode_config.idr_mutex);
idr_remove(&dev->mode_config.tile_idr, tg->id);
mutex_unlock(&dev->mode_config.idr_mutex);
kfree(tg);
}
/**
* drm_mode_put_tile_group - drop a reference to a tile group.
* @dev: DRM device
* @tg: tile group to drop reference to.
*
* drop reference to tile group and free if 0.
*/
void drm_mode_put_tile_group(struct drm_device *dev,
struct drm_tile_group *tg)
{
kref_put(&tg->refcount, drm_tile_group_free);
}
EXPORT_SYMBOL(drm_mode_put_tile_group);
/**
* drm_mode_get_tile_group - get a reference to an existing tile group
* @dev: DRM device
* @topology: 8-bytes unique per monitor.
*
* Use the unique bytes to get a reference to an existing tile group.
*
* RETURNS:
* tile group or NULL if not found.
*/
struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev,
char topology[8])
{
struct drm_tile_group *tg;
int id;
mutex_lock(&dev->mode_config.idr_mutex);
idr_for_each_entry(&dev->mode_config.tile_idr, tg, id) {
if (!memcmp(tg->group_data, topology, 8)) {
if (!kref_get_unless_zero(&tg->refcount))
tg = NULL;
mutex_unlock(&dev->mode_config.idr_mutex);
return tg;
}
}
mutex_unlock(&dev->mode_config.idr_mutex);
return NULL;
}
EXPORT_SYMBOL(drm_mode_get_tile_group);
/**
* drm_mode_create_tile_group - create a tile group from a displayid description
* @dev: DRM device
* @topology: 8-bytes unique per monitor.
*
* Create a tile group for the unique monitor, and get a unique
* identifier for the tile group.
*
* RETURNS:
* new tile group or NULL.
*/
struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev,
char topology[8])
{
struct drm_tile_group *tg;
int ret;
tg = kzalloc(sizeof(*tg), GFP_KERNEL);
if (!tg)
return NULL;
kref_init(&tg->refcount);
memcpy(tg->group_data, topology, 8);
tg->dev = dev;
mutex_lock(&dev->mode_config.idr_mutex);
ret = idr_alloc(&dev->mode_config.tile_idr, tg, 1, 0, GFP_KERNEL);
if (ret >= 0) {
tg->id = ret;
} else {
kfree(tg);
tg = NULL;
}
mutex_unlock(&dev->mode_config.idr_mutex);
return tg;
}
EXPORT_SYMBOL(drm_mode_create_tile_group);
