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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| * Copyright © 2014 Red Hat | ||
| * | ||
| * 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 <linux/bitfield.h> | ||
| #include <linux/delay.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/i2c.h> | ||
| #include <linux/init.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/random.h> | ||
| #include <linux/sched.h> | ||
| #include <linux/seq_file.h> | ||
| #include <linux/iopoll.h> | ||
| #include <linux/version.h> | ||
|
|
||
| #if IS_ENABLED(CONFIG_DRM_DEBUG_DP_MST_TOPOLOGY_REFS) | ||
| #include <linux/stacktrace.h> | ||
| #include <linux/sort.h> | ||
| #include <linux/timekeeping.h> | ||
| #include <linux/math64.h> | ||
| #endif | ||
|
|
||
| #include <drm/display/drm_dp_mst_helper.h> | ||
| #include <drm/drm_atomic.h> | ||
| #include <drm/drm_atomic_helper.h> | ||
| #include <drm/drm_drv.h> | ||
| #include <drm/drm_edid.h> | ||
| #include <drm/drm_fixed.h> | ||
| #include <drm/drm_print.h> | ||
| #include <drm/drm_probe_helper.h> | ||
|
|
||
| #if LINUX_VERSION_CODE < KERNEL_VERSION(6, 8, 0) | ||
| // https://github.com/gregkh/linux/commit/9dcf67deeab6fbc4984175278b1b2c59881dca52 | ||
|
|
||
| static bool drm_dp_mst_port_downstream_of_branch(struct drm_dp_mst_port *port, | ||
| struct drm_dp_mst_branch *branch) | ||
| { | ||
| while (port->parent) { | ||
| if (port->parent == branch) | ||
| return true; | ||
|
|
||
| if (port->parent->port_parent) | ||
| port = port->parent->port_parent; | ||
| else | ||
| break; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| static struct drm_dp_mst_port * | ||
| drm_dp_mst_topology_get_port_validated_locked(struct drm_dp_mst_branch *mstb, | ||
| struct drm_dp_mst_port *to_find) | ||
| { | ||
| struct drm_dp_mst_port *port, *mport; | ||
|
|
||
| list_for_each_entry(port, &mstb->ports, next) { | ||
| if (port == to_find) | ||
| return port; | ||
|
|
||
| if (port->mstb) { | ||
| mport = drm_dp_mst_topology_get_port_validated_locked( | ||
| port->mstb, to_find); | ||
| if (mport) | ||
| return mport; | ||
| } | ||
| } | ||
| return NULL; | ||
| } | ||
|
|
||
| static bool | ||
| drm_dp_mst_port_downstream_of_parent_locked(struct drm_dp_mst_topology_mgr *mgr, | ||
| struct drm_dp_mst_port *port, | ||
| struct drm_dp_mst_port *parent) | ||
| { | ||
| if (!mgr->mst_primary) | ||
| return false; | ||
| port = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, | ||
| port); | ||
| if (!port) | ||
| return false; | ||
| if (!parent) | ||
| return true; | ||
| parent = drm_dp_mst_topology_get_port_validated_locked(mgr->mst_primary, | ||
| parent); | ||
| if (!parent) | ||
| return false; | ||
| if (!parent->mstb) | ||
| return false; | ||
| return drm_dp_mst_port_downstream_of_branch(port, parent->mstb); | ||
| } | ||
| /** | ||
| * drm_dp_mst_port_downstream_of_parent - check if a port is downstream of a parent port | ||
| * @mgr: MST topology manager | ||
| * @port: the port being looked up | ||
| * @parent: the parent port | ||
| * | ||
| * The function returns %true if @port is downstream of @parent. If @parent is | ||
| * %NULL - denoting the root port - the function returns %true if @port is in | ||
| * @mgr's topology. | ||
| */ | ||
| bool | ||
| drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr, | ||
| struct drm_dp_mst_port *port, | ||
| struct drm_dp_mst_port *parent) | ||
| { | ||
| bool ret; | ||
| mutex_lock(&mgr->lock); | ||
| ret = drm_dp_mst_port_downstream_of_parent_locked(mgr, port, parent); | ||
| mutex_unlock(&mgr->lock); | ||
| return ret; | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| /* SPDX-License-Identifier: MIT */ | ||
|
|
||
| #ifndef __BACKPORT_DRM_DP_MST_HELPER_H__ | ||
| #define __BACKPORT_DRM_DP_MST_HELPER_H__ | ||
|
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| #include <linux/version.h> | ||
| #include_next <drm/display/drm_dp_mst_helper.h> | ||
|
|
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| #if LINUX_VERSION_CODE < KERNEL_VERSION(6, 8, 0) | ||
| // https://github.com/gregkh/linux/commit/9dcf67deeab6fbc4984175278b1b2c59881dca52 | ||
| bool drm_dp_mst_port_downstream_of_parent(struct drm_dp_mst_topology_mgr *mgr, | ||
| struct drm_dp_mst_port *port, | ||
| struct drm_dp_mst_port *parent); | ||
| #endif | ||
|
|
||
| #endif /* __DRM_DRM_DP_MST_HELPER_H__ */ |