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OpenCloudOS-Kernel/drivers/gpu/drm/drm_connector.c

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/*
* 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/drmP.h>
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.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_mode_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" },
};
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 %dx%d@%dHz%s%s%s\n",
connector->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);
}
/**
* 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;
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;
ret = ida_simple_get(&config->connector_ida, 0, 0, GFP_KERNEL);
if (ret < 0)
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->status = connector_status_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)
drm_object_attach_property(&connector->base,
config->edid_property,
0);
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);
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_mode_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_mode_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 < DRM_CONNECTOR_MAX_ENCODER; i++) {
if (connector->encoder_ids[i] == 0) {
connector->encoder_ids[i] = encoder->base.id;
return 0;
}
}
return -ENOMEM;
}
EXPORT_SYMBOL(drm_mode_connector_attach_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->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->registered)
goto unlock;
ret = drm_sysfs_connector_add(connector);
if (ret)
goto unlock;
ret = drm_debugfs_connector_add(connector);
if (ret) {
goto err_sysfs;
}
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->registered = true;
goto unlock;
err_debugfs:
drm_debugfs_connector_remove(connector);
err_sysfs:
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->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->registered = false;
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);
/**
* drm_connector_list_iter_next - return next connector
* @iter: connectr_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));
spin_unlock_irqrestore(&config->connector_list_lock, flags);
if (old_conn)
drm_connector_put(old_conn);
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)
{
iter->dev = NULL;
if (iter->conn)
drm_connector_put(iter->conn);
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_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)
/**
* 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_mode_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_mode_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_mode_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_mode_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.
*
* Connectors also have one standardized atomic property:
*
* CRTC_ID:
* Mode object ID of the &drm_crtc this connector should be connected to.
*/
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;
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);
/**
* drm_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.
*/
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)
goto nomem;
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)
goto nomem;
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)
goto nomem;
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)
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,
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);
/**
* 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, j = 0;
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, j++,
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);
/**
* 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_mode_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_mode_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_mode_connector_set_path_property);
/**
* drm_mode_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.
*
* Returns:
* Zero on success, errno on failure.
*/
int drm_mode_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_mode_connector_set_tile_property);
/**
* drm_mode_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.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_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);
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);
return ret;
}
EXPORT_SYMBOL(drm_mode_connector_update_edid_property);
/**
* drm_mode_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_mode_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_mode_connector_set_link_status_property);
int drm_mode_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_mode_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 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;
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;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
if (!connector)
return -ENOENT;
for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
if (connector->encoder_ids[i] != 0)
encoders_count++;
if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
copied = 0;
encoder_ptr = (uint32_t __user *)(unsigned long)(out_resp->encoders_ptr);
for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
if (connector->encoder_ids[i] != 0) {
if (put_user(connector->encoder_ids[i],
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, file_priv))
mode_count++;
/*
* This ioctl is called twice, once to determine how much space is
* needed, and the 2nd time to fill it.
*/
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, &connector->modes, head) {
if (!drm_mode_expose_to_userspace(mode, file_priv))
continue;
drm_mode_convert_to_umode(&u_mode, mode);
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 error.
*/
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 ERR_PTR(-ENOMEM);
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 = ERR_PTR(ret);
}
mutex_unlock(&dev->mode_config.idr_mutex);
return tg;
}
EXPORT_SYMBOL(drm_mode_create_tile_group);
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