OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​drm_atomic.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * Copyright (C) 2014 Red Hat
  * Copyright (C) 2014 Intel Corp.
  * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
  * Authors:
  * Rob Clark <robdclark@gmail.com>
  * Daniel Vetter <daniel.vetter@ffwll.ch>
  */
 
 
 #include <linux/sync_file.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_uapi.h>
 #include <drm/drm_blend.h>
 #include <drm/drm_bridge.h>
 #include <drm/drm_debugfs.h>
 #include <drm/drm_device.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_framebuffer.h>
 #include <drm/drm_mode.h>
 #include <drm/drm_print.h>
 #include <drm/drm_writeback.h>
 
 #include "drm_crtc_internal.h"
 #include "drm_internal.h"
 
 void __drm_crtc_commit_free(struct kref *kref)
 {
     struct drm_crtc_commit *commit =
         container_of(kref, struct drm_crtc_commit, ref);
 
     kfree(commit);
 }
 EXPORT_SYMBOL(__drm_crtc_commit_free);
 
 /**
  * drm_crtc_commit_wait - Waits for a commit to complete
  * @commit: &drm_crtc_commit to wait for
  *
  * Waits for a given &drm_crtc_commit to be programmed into the
  * hardware and flipped to.
  *
  * Returns:
  *
  * 0 on success, a negative error code otherwise.
  */
 int drm_crtc_commit_wait(struct drm_crtc_commit *commit)
 {
     unsigned long timeout = 10 * HZ;
     int ret;
 
     if (!commit)
         return 0;
 
     ret = wait_for_completion_timeout(&commit->hw_done, timeout);
     if (!ret) {
         drm_err(commit->crtc->dev, "hw_done timed out\n");
         return -ETIMEDOUT;
     }
 
     /*
      * Currently no support for overwriting flips, hence
      * stall for previous one to execute completely.
      */
     ret = wait_for_completion_timeout(&commit->flip_done, timeout);
     if (!ret) {
         drm_err(commit->crtc->dev, "flip_done timed out\n");
         return -ETIMEDOUT;
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_crtc_commit_wait);
 
 /**
  * drm_atomic_state_default_release -
  * release memory initialized by drm_atomic_state_init
  * @state: atomic state
  *
  * Free all the memory allocated by drm_atomic_state_init.
  * This should only be used by drivers which are still subclassing
  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  */
 void drm_atomic_state_default_release(struct drm_atomic_state *state)
 {
     kfree(state->connectors);
     kfree(state->crtcs);
     kfree(state->planes);
     kfree(state->private_objs);
 }
 EXPORT_SYMBOL(drm_atomic_state_default_release);
 
 /**
  * drm_atomic_state_init - init new atomic state
  * @dev: DRM device
  * @state: atomic state
  *
  * Default implementation for filling in a new atomic state.
  * This should only be used by drivers which are still subclassing
  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  */
 int
 drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
 {
     kref_init(&state->ref);
 
     /* TODO legacy paths should maybe do a better job about
      * setting this appropriately?
      */
     state->allow_modeset = true;
 
     state->crtcs = kcalloc(dev->mode_config.num_crtc,
                    sizeof(*state->crtcs), GFP_KERNEL);
     if (!state->crtcs)
         goto fail;
     state->planes = kcalloc(dev->mode_config.num_total_plane,
                 sizeof(*state->planes), GFP_KERNEL);
     if (!state->planes)
         goto fail;
 
     state->dev = dev;
 
     drm_dbg_atomic(dev, "Allocated atomic state %p\n", state);
 
     return 0;
 fail:
     drm_atomic_state_default_release(state);
     return -ENOMEM;
 }
 EXPORT_SYMBOL(drm_atomic_state_init);
 
 /**
  * drm_atomic_state_alloc - allocate atomic state
  * @dev: DRM device
  *
  * This allocates an empty atomic state to track updates.
  */
 struct drm_atomic_state *
 drm_atomic_state_alloc(struct drm_device *dev)
 {
     struct drm_mode_config *config = &dev->mode_config;
 
     if (!config->funcs->atomic_state_alloc) {
         struct drm_atomic_state *state;
 
         state = kzalloc(sizeof(*state), GFP_KERNEL);
         if (!state)
             return NULL;
         if (drm_atomic_state_init(dev, state) < 0) {
             kfree(state);
             return NULL;
         }
         return state;
     }
 
     return config->funcs->atomic_state_alloc(dev);
 }
 EXPORT_SYMBOL(drm_atomic_state_alloc);
 
 /**
  * drm_atomic_state_default_clear - clear base atomic state
  * @state: atomic state
  *
  * Default implementation for clearing atomic state.
  * This should only be used by drivers which are still subclassing
  * &drm_atomic_state and haven't switched to &drm_private_state yet.
  */
 void drm_atomic_state_default_clear(struct drm_atomic_state *state)
 {
     struct drm_device *dev = state->dev;
     struct drm_mode_config *config = &dev->mode_config;
     int i;
 
     drm_dbg_atomic(dev, "Clearing atomic state %p\n", state);
 
     for (i = 0; i < state->num_connector; i++) {
         struct drm_connector *connector = state->connectors[i].ptr;
 
         if (!connector)
             continue;
 
         connector->funcs->atomic_destroy_state(connector,
                                state->connectors[i].state);
         state->connectors[i].ptr = NULL;
         state->connectors[i].state = NULL;
         state->connectors[i].old_state = NULL;
         state->connectors[i].new_state = NULL;
         drm_connector_put(connector);
     }
 
     for (i = 0; i < config->num_crtc; i++) {
         struct drm_crtc *crtc = state->crtcs[i].ptr;
 
         if (!crtc)
             continue;
 
         crtc->funcs->atomic_destroy_state(crtc,
                           state->crtcs[i].state);
 
         state->crtcs[i].ptr = NULL;
         state->crtcs[i].state = NULL;
         state->crtcs[i].old_state = NULL;
         state->crtcs[i].new_state = NULL;
 
         if (state->crtcs[i].commit) {
             drm_crtc_commit_put(state->crtcs[i].commit);
             state->crtcs[i].commit = NULL;
         }
     }
 
     for (i = 0; i < config->num_total_plane; i++) {
         struct drm_plane *plane = state->planes[i].ptr;
 
         if (!plane)
             continue;
 
         plane->funcs->atomic_destroy_state(plane,
                            state->planes[i].state);
         state->planes[i].ptr = NULL;
         state->planes[i].state = NULL;
         state->planes[i].old_state = NULL;
         state->planes[i].new_state = NULL;
     }
 
     for (i = 0; i < state->num_private_objs; i++) {
         struct drm_private_obj *obj = state->private_objs[i].ptr;
 
         obj->funcs->atomic_destroy_state(obj,
                          state->private_objs[i].state);
         state->private_objs[i].ptr = NULL;
         state->private_objs[i].state = NULL;
         state->private_objs[i].old_state = NULL;
         state->private_objs[i].new_state = NULL;
     }
     state->num_private_objs = 0;
 
     if (state->fake_commit) {
         drm_crtc_commit_put(state->fake_commit);
         state->fake_commit = NULL;
     }
 }
 EXPORT_SYMBOL(drm_atomic_state_default_clear);
 
 /**
  * drm_atomic_state_clear - clear state object
  * @state: atomic state
  *
  * When the w/w mutex algorithm detects a deadlock we need to back off and drop
  * all locks. So someone else could sneak in and change the current modeset
  * configuration. Which means that all the state assembled in @state is no
  * longer an atomic update to the current state, but to some arbitrary earlier
  * state. Which could break assumptions the driver's
  * &drm_mode_config_funcs.atomic_check likely relies on.
  *
  * Hence we must clear all cached state and completely start over, using this
  * function.
  */
 void drm_atomic_state_clear(struct drm_atomic_state *state)
 {
     struct drm_device *dev = state->dev;
     struct drm_mode_config *config = &dev->mode_config;
 
     if (config->funcs->atomic_state_clear)
         config->funcs->atomic_state_clear(state);
     else
         drm_atomic_state_default_clear(state);
 }
 EXPORT_SYMBOL(drm_atomic_state_clear);
 
 /**
  * __drm_atomic_state_free - free all memory for an atomic state
  * @ref: This atomic state to deallocate
  *
  * This frees all memory associated with an atomic state, including all the
  * per-object state for planes, CRTCs and connectors.
  */
 void __drm_atomic_state_free(struct kref *ref)
 {
     struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
     struct drm_mode_config *config = &state->dev->mode_config;
 
     drm_atomic_state_clear(state);
 
     drm_dbg_atomic(state->dev, "Freeing atomic state %p\n", state);
 
     if (config->funcs->atomic_state_free) {
         config->funcs->atomic_state_free(state);
     } else {
         drm_atomic_state_default_release(state);
         kfree(state);
     }
 }
 EXPORT_SYMBOL(__drm_atomic_state_free);
 
 /**
  * drm_atomic_get_crtc_state - get CRTC state
  * @state: global atomic state object
  * @crtc: CRTC to get state object for
  *
  * This function returns the CRTC state for the given CRTC, allocating it if
  * needed. It will also grab the relevant CRTC lock to make sure that the state
  * is consistent.
  *
  * WARNING: Drivers may only add new CRTC states to a @state if
  * drm_atomic_state.allow_modeset is set, or if it's a driver-internal commit
  * not created by userspace through an IOCTL call.
  *
  * Returns:
  *
  * Either the allocated state or the error code encoded into the pointer. When
  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
  * entire atomic sequence must be restarted. All other errors are fatal.
  */
 struct drm_crtc_state *
 drm_atomic_get_crtc_state(struct drm_atomic_state *state,
               struct drm_crtc *crtc)
 {
     int ret, index = drm_crtc_index(crtc);
     struct drm_crtc_state *crtc_state;
 
     WARN_ON(!state->acquire_ctx);
 
     crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
     if (crtc_state)
         return crtc_state;
 
     ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
     if (ret)
         return ERR_PTR(ret);
 
     crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
     if (!crtc_state)
         return ERR_PTR(-ENOMEM);
 
     state->crtcs[index].state = crtc_state;
     state->crtcs[index].old_state = crtc->state;
     state->crtcs[index].new_state = crtc_state;
     state->crtcs[index].ptr = crtc;
     crtc_state->state = state;
 
     drm_dbg_atomic(state->dev, "Added [CRTC:%d:%s] %p state to %p\n",
                crtc->base.id, crtc->name, crtc_state, state);
 
     return crtc_state;
 }
 EXPORT_SYMBOL(drm_atomic_get_crtc_state);
 
 static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
                  const struct drm_crtc_state *new_crtc_state)
 {
     struct drm_crtc *crtc = new_crtc_state->crtc;
 
     /* NOTE: we explicitly don't enforce constraints such as primary
      * layer covering entire screen, since that is something we want
      * to allow (on hw that supports it).  For hw that does not, it
      * should be checked in driver's crtc->atomic_check() vfunc.
      *
      * TODO: Add generic modeset state checks once we support those.
      */
 
     if (new_crtc_state->active && !new_crtc_state->enable) {
         drm_dbg_atomic(crtc->dev,
                    "[CRTC:%d:%s] active without enabled\n",
                    crtc->base.id, crtc->name);
         return -EINVAL;
     }
 
     /* The state->enable vs. state->mode_blob checks can be WARN_ON,
      * as this is a kernel-internal detail that userspace should never
      * be able to trigger.
      */
     if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
         WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
         drm_dbg_atomic(crtc->dev,
                    "[CRTC:%d:%s] enabled without mode blob\n",
                    crtc->base.id, crtc->name);
         return -EINVAL;
     }
 
     if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
         WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
         drm_dbg_atomic(crtc->dev,
                    "[CRTC:%d:%s] disabled with mode blob\n",
                    crtc->base.id, crtc->name);
         return -EINVAL;
     }
 
     /*
      * Reject event generation for when a CRTC is off and stays off.
      * It wouldn't be hard to implement this, but userspace has a track
      * record of happily burning through 100% cpu (or worse, crash) when the
      * display pipe is suspended. To avoid all that fun just reject updates
      * that ask for events since likely that indicates a bug in the
      * compositor's drawing loop. This is consistent with the vblank IOCTL
      * and legacy page_flip IOCTL which also reject service on a disabled
      * pipe.
      */
     if (new_crtc_state->event &&
         !new_crtc_state->active && !old_crtc_state->active) {
         drm_dbg_atomic(crtc->dev,
                    "[CRTC:%d:%s] requesting event but off\n",
                    crtc->base.id, crtc->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static void drm_atomic_crtc_print_state(struct drm_printer *p,
         const struct drm_crtc_state *state)
 {
     struct drm_crtc *crtc = state->crtc;
 
     drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
     drm_printf(p, "\tenable=%d\n", state->enable);
     drm_printf(p, "\tactive=%d\n", state->active);
     drm_printf(p, "\tself_refresh_active=%d\n", state->self_refresh_active);
     drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
     drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
     drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
     drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed);
     drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
     drm_printf(p, "\tplane_mask=%x\n", state->plane_mask);
     drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask);
     drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask);
     drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode));
 
     if (crtc->funcs->atomic_print_state)
         crtc->funcs->atomic_print_state(p, state);
 }
 
 static int drm_atomic_connector_check(struct drm_connector *connector,
         struct drm_connector_state *state)
 {
     struct drm_crtc_state *crtc_state;
     struct drm_writeback_job *writeback_job = state->writeback_job;
     const struct drm_display_info *info = &connector->display_info;
 
     state->max_bpc = info->bpc ? info->bpc : 8;
     if (connector->max_bpc_property)
         state->max_bpc = min(state->max_bpc, state->max_requested_bpc);
 
     if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job)
         return 0;
 
     if (writeback_job->fb && !state->crtc) {
         drm_dbg_atomic(connector->dev,
                    "[CONNECTOR:%d:%s] framebuffer without CRTC\n",
                    connector->base.id, connector->name);
         return -EINVAL;
     }
 
     if (state->crtc)
         crtc_state = drm_atomic_get_existing_crtc_state(state->state,
                                 state->crtc);
 
     if (writeback_job->fb && !crtc_state->active) {
         drm_dbg_atomic(connector->dev,
                    "[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n",
                    connector->base.id, connector->name,
                    state->crtc->base.id);
         return -EINVAL;
     }
 
     if (!writeback_job->fb) {
         if (writeback_job->out_fence) {
             drm_dbg_atomic(connector->dev,
                        "[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
                        connector->base.id, connector->name);
             return -EINVAL;
         }
 
         drm_writeback_cleanup_job(writeback_job);
         state->writeback_job = NULL;
     }
 
     return 0;
 }
 
 /**
  * drm_atomic_get_plane_state - get plane state
  * @state: global atomic state object
  * @plane: plane to get state object for
  *
  * This function returns the plane state for the given plane, allocating it if
  * needed. It will also grab the relevant plane lock to make sure that the state
  * is consistent.
  *
  * Returns:
  *
  * Either the allocated state or the error code encoded into the pointer. When
  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
  * entire atomic sequence must be restarted. All other errors are fatal.
  */
 struct drm_plane_state *
 drm_atomic_get_plane_state(struct drm_atomic_state *state,
               struct drm_plane *plane)
 {
     int ret, index = drm_plane_index(plane);
     struct drm_plane_state *plane_state;
 
     WARN_ON(!state->acquire_ctx);
 
     /* the legacy pointers should never be set */
     WARN_ON(plane->fb);
     WARN_ON(plane->old_fb);
     WARN_ON(plane->crtc);
 
     plane_state = drm_atomic_get_existing_plane_state(state, plane);
     if (plane_state)
         return plane_state;
 
     ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
     if (ret)
         return ERR_PTR(ret);
 
     plane_state = plane->funcs->atomic_duplicate_state(plane);
     if (!plane_state)
         return ERR_PTR(-ENOMEM);
 
     state->planes[index].state = plane_state;
     state->planes[index].ptr = plane;
     state->planes[index].old_state = plane->state;
     state->planes[index].new_state = plane_state;
     plane_state->state = state;
 
     drm_dbg_atomic(plane->dev, "Added [PLANE:%d:%s] %p state to %p\n",
                plane->base.id, plane->name, plane_state, state);
 
     if (plane_state->crtc) {
         struct drm_crtc_state *crtc_state;
 
         crtc_state = drm_atomic_get_crtc_state(state,
                                plane_state->crtc);
         if (IS_ERR(crtc_state))
             return ERR_CAST(crtc_state);
     }
 
     return plane_state;
 }
 EXPORT_SYMBOL(drm_atomic_get_plane_state);
 
 static bool
 plane_switching_crtc(const struct drm_plane_state *old_plane_state,
              const struct drm_plane_state *new_plane_state)
 {
     if (!old_plane_state->crtc || !new_plane_state->crtc)
         return false;
 
     if (old_plane_state->crtc == new_plane_state->crtc)
         return false;
 
     /* This could be refined, but currently there's no helper or driver code
      * to implement direct switching of active planes nor userspace to take
      * advantage of more direct plane switching without the intermediate
      * full OFF state.
      */
     return true;
 }
 
 /**
  * drm_atomic_plane_check - check plane state
  * @old_plane_state: old plane state to check
  * @new_plane_state: new plane state to check
  *
  * Provides core sanity checks for plane state.
  *
  * RETURNS:
  * Zero on success, error code on failure
  */
 static int drm_atomic_plane_check(const struct drm_plane_state *old_plane_state,
                   const struct drm_plane_state *new_plane_state)
 {
     struct drm_plane *plane = new_plane_state->plane;
     struct drm_crtc *crtc = new_plane_state->crtc;
     const struct drm_framebuffer *fb = new_plane_state->fb;
     unsigned int fb_width, fb_height;
     struct drm_mode_rect *clips;
     uint32_t num_clips;
     int ret;
 
     /* either *both* CRTC and FB must be set, or neither */
     if (crtc && !fb) {
         drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] CRTC set but no FB\n",
                    plane->base.id, plane->name);
         return -EINVAL;
     } else if (fb && !crtc) {
         drm_dbg_atomic(plane->dev, "[PLANE:%d:%s] FB set but no CRTC\n",
                    plane->base.id, plane->name);
         return -EINVAL;
     }
 
     /* if disabled, we don't care about the rest of the state: */
     if (!crtc)
         return 0;
 
     /* Check whether this plane is usable on this CRTC */
     if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
         drm_dbg_atomic(plane->dev,
                    "Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
                    crtc->base.id, crtc->name,
                    plane->base.id, plane->name);
         return -EINVAL;
     }
 
     /* Check whether this plane supports the fb pixel format. */
     ret = drm_plane_check_pixel_format(plane, fb->format->format,
                        fb->modifier);
     if (ret) {
         drm_dbg_atomic(plane->dev,
                    "[PLANE:%d:%s] invalid pixel format %p4cc, modifier 0x%llx\n",
                    plane->base.id, plane->name,
                    &fb->format->format, fb->modifier);
         return ret;
     }
 
     /* Give drivers some help against integer overflows */
     if (new_plane_state->crtc_w > INT_MAX ||
         new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
         new_plane_state->crtc_h > INT_MAX ||
         new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
         drm_dbg_atomic(plane->dev,
                    "[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
                    plane->base.id, plane->name,
                    new_plane_state->crtc_w, new_plane_state->crtc_h,
                    new_plane_state->crtc_x, new_plane_state->crtc_y);
         return -ERANGE;
     }
 
     fb_width = fb->width << 16;
     fb_height = fb->height << 16;
 
     /* Make sure source coordinates are inside the fb. */
     if (new_plane_state->src_w > fb_width ||
         new_plane_state->src_x > fb_width - new_plane_state->src_w ||
         new_plane_state->src_h > fb_height ||
         new_plane_state->src_y > fb_height - new_plane_state->src_h) {
         drm_dbg_atomic(plane->dev,
                    "[PLANE:%d:%s] invalid source coordinates "
                    "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
                    plane->base.id, plane->name,
                    new_plane_state->src_w >> 16,
                    ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
                    new_plane_state->src_h >> 16,
                    ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
                    new_plane_state->src_x >> 16,
                    ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
                    new_plane_state->src_y >> 16,
                    ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
                    fb->width, fb->height);
         return -ENOSPC;
     }
 
     clips = __drm_plane_get_damage_clips(new_plane_state);
     num_clips = drm_plane_get_damage_clips_count(new_plane_state);
 
     /* Make sure damage clips are valid and inside the fb. */
     while (num_clips > 0) {
         if (clips->x1 >= clips->x2 ||
             clips->y1 >= clips->y2 ||
             clips->x1 < 0 ||
             clips->y1 < 0 ||
             clips->x2 > fb_width ||
             clips->y2 > fb_height) {
             drm_dbg_atomic(plane->dev,
                        "[PLANE:%d:%s] invalid damage clip %d %d %d %d\n",
                        plane->base.id, plane->name, clips->x1,
                        clips->y1, clips->x2, clips->y2);
             return -EINVAL;
         }
         clips++;
         num_clips--;
     }
 
     if (plane_switching_crtc(old_plane_state, new_plane_state)) {
         drm_dbg_atomic(plane->dev,
                    "[PLANE:%d:%s] switching CRTC directly\n",
                    plane->base.id, plane->name);
         return -EINVAL;
     }
 
     return 0;
 }
 
 static void drm_atomic_plane_print_state(struct drm_printer *p,
         const struct drm_plane_state *state)
 {
     struct drm_plane *plane = state->plane;
     struct drm_rect src  = drm_plane_state_src(state);
     struct drm_rect dest = drm_plane_state_dest(state);
 
     drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
     drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
     drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
     if (state->fb)
         drm_framebuffer_print_info(p, 2, state->fb);
     drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
     drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
     drm_printf(p, "\trotation=%x\n", state->rotation);
     drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
     drm_printf(p, "\tcolor-encoding=%s\n",
            drm_get_color_encoding_name(state->color_encoding));
     drm_printf(p, "\tcolor-range=%s\n",
            drm_get_color_range_name(state->color_range));
 
     if (plane->funcs->atomic_print_state)
         plane->funcs->atomic_print_state(p, state);
 }
 
 /**
  * DOC: handling driver private state
  *
  * Very often the DRM objects exposed to userspace in the atomic modeset api
  * (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
  * underlying hardware. Especially for any kind of shared resources (e.g. shared
  * clocks, scaler units, bandwidth and fifo limits shared among a group of
  * planes or CRTCs, and so on) it makes sense to model these as independent
  * objects. Drivers then need to do similar state tracking and commit ordering for
  * such private (since not exposed to userspace) objects as the atomic core and
  * helpers already provide for connectors, planes and CRTCs.
  *
  * To make this easier on drivers the atomic core provides some support to track
  * driver private state objects using struct &drm_private_obj, with the
  * associated state struct &drm_private_state.
  *
  * Similar to userspace-exposed objects, private state structures can be
  * acquired by calling drm_atomic_get_private_obj_state(). This also takes care
  * of locking, hence drivers should not have a need to call drm_modeset_lock()
  * directly. Sequence of the actual hardware state commit is not handled,
  * drivers might need to keep track of struct drm_crtc_commit within subclassed
  * structure of &drm_private_state as necessary, e.g. similar to
  * &drm_plane_state.commit. See also &drm_atomic_state.fake_commit.
  *
  * All private state structures contained in a &drm_atomic_state update can be
  * iterated using for_each_oldnew_private_obj_in_state(),
  * for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
  * Drivers are recommended to wrap these for each type of driver private state
  * object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
  * least if they want to iterate over all objects of a given type.
  *
  * An earlier way to handle driver private state was by subclassing struct
  * &drm_atomic_state. But since that encourages non-standard ways to implement
  * the check/commit split atomic requires (by using e.g. "check and rollback or
  * commit instead" of "duplicate state, check, then either commit or release
  * duplicated state) it is deprecated in favour of using &drm_private_state.
  */
 
 /**
  * drm_atomic_private_obj_init - initialize private object
  * @dev: DRM device this object will be attached to
  * @obj: private object
  * @state: initial private object state
  * @funcs: pointer to the struct of function pointers that identify the object
  * type
  *
  * Initialize the private object, which can be embedded into any
  * driver private object that needs its own atomic state.
  */
 void
 drm_atomic_private_obj_init(struct drm_device *dev,
                 struct drm_private_obj *obj,
                 struct drm_private_state *state,
                 const struct drm_private_state_funcs *funcs)
 {
     memset(obj, 0, sizeof(*obj));
 
     drm_modeset_lock_init(&obj->lock);
 
     obj->state = state;
     obj->funcs = funcs;
     list_add_tail(&obj->head, &dev->mode_config.privobj_list);
 
     state->obj = obj;
 }
 EXPORT_SYMBOL(drm_atomic_private_obj_init);
 
 /**
  * drm_atomic_private_obj_fini - finalize private object
  * @obj: private object
  *
  * Finalize the private object.
  */
 void
 drm_atomic_private_obj_fini(struct drm_private_obj *obj)
 {
     list_del(&obj->head);
     obj->funcs->atomic_destroy_state(obj, obj->state);
     drm_modeset_lock_fini(&obj->lock);
 }
 EXPORT_SYMBOL(drm_atomic_private_obj_fini);
 
 /**
  * drm_atomic_get_private_obj_state - get private object state
  * @state: global atomic state
  * @obj: private object to get the state for
  *
  * This function returns the private object state for the given private object,
  * allocating the state if needed. It will also grab the relevant private
  * object lock to make sure that the state is consistent.
  *
  * RETURNS:
  *
  * Either the allocated state or the error code encoded into a pointer.
  */
 struct drm_private_state *
 drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
                  struct drm_private_obj *obj)
 {
     int index, num_objs, i, ret;
     size_t size;
     struct __drm_private_objs_state *arr;
     struct drm_private_state *obj_state;
 
     for (i = 0; i < state->num_private_objs; i++)
         if (obj == state->private_objs[i].ptr)
             return state->private_objs[i].state;
 
     ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
     if (ret)
         return ERR_PTR(ret);
 
     num_objs = state->num_private_objs + 1;
     size = sizeof(*state->private_objs) * num_objs;
     arr = krealloc(state->private_objs, size, GFP_KERNEL);
     if (!arr)
         return ERR_PTR(-ENOMEM);
 
     state->private_objs = arr;
     index = state->num_private_objs;
     memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
 
     obj_state = obj->funcs->atomic_duplicate_state(obj);
     if (!obj_state)
         return ERR_PTR(-ENOMEM);
 
     state->private_objs[index].state = obj_state;
     state->private_objs[index].old_state = obj->state;
     state->private_objs[index].new_state = obj_state;
     state->private_objs[index].ptr = obj;
     obj_state->state = state;
 
     state->num_private_objs = num_objs;
 
     drm_dbg_atomic(state->dev,
                "Added new private object %p state %p to %p\n",
                obj, obj_state, state);
 
     return obj_state;
 }
 EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
 
 /**
  * drm_atomic_get_old_private_obj_state
  * @state: global atomic state object
  * @obj: private_obj to grab
  *
  * This function returns the old private object state for the given private_obj,
  * or NULL if the private_obj is not part of the global atomic state.
  */
 struct drm_private_state *
 drm_atomic_get_old_private_obj_state(struct drm_atomic_state *state,
                      struct drm_private_obj *obj)
 {
     int i;
 
     for (i = 0; i < state->num_private_objs; i++)
         if (obj == state->private_objs[i].ptr)
             return state->private_objs[i].old_state;
 
     return NULL;
 }
 EXPORT_SYMBOL(drm_atomic_get_old_private_obj_state);
 
 /**
  * drm_atomic_get_new_private_obj_state
  * @state: global atomic state object
  * @obj: private_obj to grab
  *
  * This function returns the new private object state for the given private_obj,
  * or NULL if the private_obj is not part of the global atomic state.
  */
 struct drm_private_state *
 drm_atomic_get_new_private_obj_state(struct drm_atomic_state *state,
                      struct drm_private_obj *obj)
 {
     int i;
 
     for (i = 0; i < state->num_private_objs; i++)
         if (obj == state->private_objs[i].ptr)
             return state->private_objs[i].new_state;
 
     return NULL;
 }
 EXPORT_SYMBOL(drm_atomic_get_new_private_obj_state);
 
 /**
  * drm_atomic_get_old_connector_for_encoder - Get old connector for an encoder
  * @state: Atomic state
  * @encoder: The encoder to fetch the connector state for
  *
  * This function finds and returns the connector that was connected to @encoder
  * as specified by the @state.
  *
  * If there is no connector in @state which previously had @encoder connected to
  * it, this function will return NULL. While this may seem like an invalid use
  * case, it is sometimes useful to differentiate commits which had no prior
  * connectors attached to @encoder vs ones that did (and to inspect their
  * state). This is especially true in enable hooks because the pipeline has
  * changed.
  *
  * Returns: The old connector connected to @encoder, or NULL if the encoder is
  * not connected.
  */
 struct drm_connector *
 drm_atomic_get_old_connector_for_encoder(struct drm_atomic_state *state,
                      struct drm_encoder *encoder)
 {
     struct drm_connector_state *conn_state;
     struct drm_connector *connector;
     unsigned int i;
 
     for_each_old_connector_in_state(state, connector, conn_state, i) {
         if (conn_state->best_encoder == encoder)
             return connector;
     }
 
     return NULL;
 }
 EXPORT_SYMBOL(drm_atomic_get_old_connector_for_encoder);
 
 /**
  * drm_atomic_get_new_connector_for_encoder - Get new connector for an encoder
  * @state: Atomic state
  * @encoder: The encoder to fetch the connector state for
  *
  * This function finds and returns the connector that will be connected to
  * @encoder as specified by the @state.
  *
  * If there is no connector in @state which will have @encoder connected to it,
  * this function will return NULL. While this may seem like an invalid use case,
  * it is sometimes useful to differentiate commits which have no connectors
  * attached to @encoder vs ones that do (and to inspect their state). This is
  * especially true in disable hooks because the pipeline will change.
  *
  * Returns: The new connector connected to @encoder, or NULL if the encoder is
  * not connected.
  */
 struct drm_connector *
 drm_atomic_get_new_connector_for_encoder(struct drm_atomic_state *state,
                      struct drm_encoder *encoder)
 {
     struct drm_connector_state *conn_state;
     struct drm_connector *connector;
     unsigned int i;
 
     for_each_new_connector_in_state(state, connector, conn_state, i) {
         if (conn_state->best_encoder == encoder)
             return connector;
     }
 
     return NULL;
 }
 EXPORT_SYMBOL(drm_atomic_get_new_connector_for_encoder);
 
 /**
  * drm_atomic_get_connector_state - get connector state
  * @state: global atomic state object
  * @connector: connector to get state object for
  *
  * This function returns the connector state for the given connector,
  * allocating it if needed. It will also grab the relevant connector lock to
  * make sure that the state is consistent.
  *
  * Returns:
  *
  * Either the allocated state or the error code encoded into the pointer. When
  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
  * entire atomic sequence must be restarted. All other errors are fatal.
  */
 struct drm_connector_state *
 drm_atomic_get_connector_state(struct drm_atomic_state *state,
               struct drm_connector *connector)
 {
     int ret, index;
     struct drm_mode_config *config = &connector->dev->mode_config;
     struct drm_connector_state *connector_state;
 
     WARN_ON(!state->acquire_ctx);
 
     ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
     if (ret)
         return ERR_PTR(ret);
 
     index = drm_connector_index(connector);
 
     if (index >= state->num_connector) {
         struct __drm_connnectors_state *c;
         int alloc = max(index + 1, config->num_connector);
 
         c = krealloc_array(state->connectors, alloc,
                    sizeof(*state->connectors), GFP_KERNEL);
         if (!c)
             return ERR_PTR(-ENOMEM);
 
         state->connectors = c;
         memset(&state->connectors[state->num_connector], 0,
                sizeof(*state->connectors) * (alloc - state->num_connector));
 
         state->num_connector = alloc;
     }
 
     if (state->connectors[index].state)
         return state->connectors[index].state;
 
     connector_state = connector->funcs->atomic_duplicate_state(connector);
     if (!connector_state)
         return ERR_PTR(-ENOMEM);
 
     drm_connector_get(connector);
     state->connectors[index].state = connector_state;
     state->connectors[index].old_state = connector->state;
     state->connectors[index].new_state = connector_state;
     state->connectors[index].ptr = connector;
     connector_state->state = state;
 
     drm_dbg_atomic(connector->dev, "Added [CONNECTOR:%d:%s] %p state to %p\n",
              connector->base.id, connector->name,
              connector_state, state);
 
     if (connector_state->crtc) {
         struct drm_crtc_state *crtc_state;
 
         crtc_state = drm_atomic_get_crtc_state(state,
                                connector_state->crtc);
         if (IS_ERR(crtc_state))
             return ERR_CAST(crtc_state);
     }
 
     return connector_state;
 }
 EXPORT_SYMBOL(drm_atomic_get_connector_state);
 
 static void drm_atomic_connector_print_state(struct drm_printer *p,
         const struct drm_connector_state *state)
 {
     struct drm_connector *connector = state->connector;
 
     drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
     drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
     drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
 
     if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
         if (state->writeback_job && state->writeback_job->fb)
             drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
 
     if (connector->funcs->atomic_print_state)
         connector->funcs->atomic_print_state(p, state);
 }
 
 /**
  * drm_atomic_get_bridge_state - get bridge state
  * @state: global atomic state object
  * @bridge: bridge to get state object for
  *
  * This function returns the bridge state for the given bridge, allocating it
  * if needed. It will also grab the relevant bridge lock to make sure that the
  * state is consistent.
  *
  * Returns:
  *
  * Either the allocated state or the error code encoded into the pointer. When
  * the error is EDEADLK then the w/w mutex code has detected a deadlock and the
  * entire atomic sequence must be restarted.
  */
 struct drm_bridge_state *
 drm_atomic_get_bridge_state(struct drm_atomic_state *state,
                 struct drm_bridge *bridge)
 {
     struct drm_private_state *obj_state;
 
     obj_state = drm_atomic_get_private_obj_state(state, &bridge->base);
     if (IS_ERR(obj_state))
         return ERR_CAST(obj_state);
 
     return drm_priv_to_bridge_state(obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_get_bridge_state);
 
 /**
  * drm_atomic_get_old_bridge_state - get old bridge state, if it exists
  * @state: global atomic state object
  * @bridge: bridge to grab
  *
  * This function returns the old bridge state for the given bridge, or NULL if
  * the bridge is not part of the global atomic state.
  */
 struct drm_bridge_state *
 drm_atomic_get_old_bridge_state(struct drm_atomic_state *state,
                 struct drm_bridge *bridge)
 {
     struct drm_private_state *obj_state;
 
     obj_state = drm_atomic_get_old_private_obj_state(state, &bridge->base);
     if (!obj_state)
         return NULL;
 
     return drm_priv_to_bridge_state(obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_get_old_bridge_state);
 
 /**
  * drm_atomic_get_new_bridge_state - get new bridge state, if it exists
  * @state: global atomic state object
  * @bridge: bridge to grab
  *
  * This function returns the new bridge state for the given bridge, or NULL if
  * the bridge is not part of the global atomic state.
  */
 struct drm_bridge_state *
 drm_atomic_get_new_bridge_state(struct drm_atomic_state *state,
                 struct drm_bridge *bridge)
 {
     struct drm_private_state *obj_state;
 
     obj_state = drm_atomic_get_new_private_obj_state(state, &bridge->base);
     if (!obj_state)
         return NULL;
 
     return drm_priv_to_bridge_state(obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_get_new_bridge_state);
 
 /**
  * drm_atomic_add_encoder_bridges - add bridges attached to an encoder
  * @state: atomic state
  * @encoder: DRM encoder
  *
  * This function adds all bridges attached to @encoder. This is needed to add
  * bridge states to @state and make them available when
  * &drm_bridge_funcs.atomic_check(), &drm_bridge_funcs.atomic_pre_enable(),
  * &drm_bridge_funcs.atomic_enable(),
  * &drm_bridge_funcs.atomic_disable_post_disable() are called.
  *
  * Returns:
  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
  * then the w/w mutex code has detected a deadlock and the entire atomic
  * sequence must be restarted. All other errors are fatal.
  */
 int
 drm_atomic_add_encoder_bridges(struct drm_atomic_state *state,
                    struct drm_encoder *encoder)
 {
     struct drm_bridge_state *bridge_state;
     struct drm_bridge *bridge;
 
     if (!encoder)
         return 0;
 
     drm_dbg_atomic(encoder->dev,
                "Adding all bridges for [encoder:%d:%s] to %p\n",
                encoder->base.id, encoder->name, state);
 
     drm_for_each_bridge_in_chain(encoder, bridge) {
         /* Skip bridges that don't implement the atomic state hooks. */
         if (!bridge->funcs->atomic_duplicate_state)
             continue;
 
         bridge_state = drm_atomic_get_bridge_state(state, bridge);
         if (IS_ERR(bridge_state))
             return PTR_ERR(bridge_state);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_add_encoder_bridges);
 
 /**
  * drm_atomic_add_affected_connectors - add connectors for CRTC
  * @state: atomic state
  * @crtc: DRM CRTC
  *
  * This function walks the current configuration and adds all connectors
  * currently using @crtc to the atomic configuration @state. Note that this
  * function must acquire the connection mutex. This can potentially cause
  * unneeded serialization if the update is just for the planes on one CRTC. Hence
  * drivers and helpers should only call this when really needed (e.g. when a
  * full modeset needs to happen due to some change).
  *
  * Returns:
  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
  * then the w/w mutex code has detected a deadlock and the entire atomic
  * sequence must be restarted. All other errors are fatal.
  */
 int
 drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
                    struct drm_crtc *crtc)
 {
     struct drm_mode_config *config = &state->dev->mode_config;
     struct drm_connector *connector;
     struct drm_connector_state *conn_state;
     struct drm_connector_list_iter conn_iter;
     struct drm_crtc_state *crtc_state;
     int ret;
 
     crtc_state = drm_atomic_get_crtc_state(state, crtc);
     if (IS_ERR(crtc_state))
         return PTR_ERR(crtc_state);
 
     ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
     if (ret)
         return ret;
 
     drm_dbg_atomic(crtc->dev,
                "Adding all current connectors for [CRTC:%d:%s] to %p\n",
                crtc->base.id, crtc->name, state);
 
     /*
      * Changed connectors are already in @state, so only need to look
      * at the connector_mask in crtc_state.
      */
     drm_connector_list_iter_begin(state->dev, &conn_iter);
     drm_for_each_connector_iter(connector, &conn_iter) {
         if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
             continue;
 
         conn_state = drm_atomic_get_connector_state(state, connector);
         if (IS_ERR(conn_state)) {
             drm_connector_list_iter_end(&conn_iter);
             return PTR_ERR(conn_state);
         }
     }
     drm_connector_list_iter_end(&conn_iter);
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
 
 /**
  * drm_atomic_add_affected_planes - add planes for CRTC
  * @state: atomic state
  * @crtc: DRM CRTC
  *
  * This function walks the current configuration and adds all planes
  * currently used by @crtc to the atomic configuration @state. This is useful
  * when an atomic commit also needs to check all currently enabled plane on
  * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
  * to avoid special code to force-enable all planes.
  *
  * Since acquiring a plane state will always also acquire the w/w mutex of the
  * current CRTC for that plane (if there is any) adding all the plane states for
  * a CRTC will not reduce parallelism of atomic updates.
  *
  * Returns:
  * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
  * then the w/w mutex code has detected a deadlock and the entire atomic
  * sequence must be restarted. All other errors are fatal.
  */
 int
 drm_atomic_add_affected_planes(struct drm_atomic_state *state,
                    struct drm_crtc *crtc)
 {
     const struct drm_crtc_state *old_crtc_state =
         drm_atomic_get_old_crtc_state(state, crtc);
     struct drm_plane *plane;
 
     WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
 
     drm_dbg_atomic(crtc->dev,
                "Adding all current planes for [CRTC:%d:%s] to %p\n",
                crtc->base.id, crtc->name, state);
 
     drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
         struct drm_plane_state *plane_state =
             drm_atomic_get_plane_state(state, plane);
 
         if (IS_ERR(plane_state))
             return PTR_ERR(plane_state);
     }
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_add_affected_planes);
 
 /**
  * drm_atomic_check_only - check whether a given config would work
  * @state: atomic configuration to check
  *
  * Note that this function can return -EDEADLK if the driver needed to acquire
  * more locks but encountered a deadlock. The caller must then do the usual w/w
  * backoff dance and restart. All other errors are fatal.
  *
  * Returns:
  * 0 on success, negative error code on failure.
  */
 int drm_atomic_check_only(struct drm_atomic_state *state)
 {
     struct drm_device *dev = state->dev;
     struct drm_mode_config *config = &dev->mode_config;
     struct drm_plane *plane;
     struct drm_plane_state *old_plane_state;
     struct drm_plane_state *new_plane_state;
     struct drm_crtc *crtc;
     struct drm_crtc_state *old_crtc_state;
     struct drm_crtc_state *new_crtc_state;
     struct drm_connector *conn;
     struct drm_connector_state *conn_state;
     unsigned int requested_crtc = 0;
     unsigned int affected_crtc = 0;
     int i, ret = 0;
 
     drm_dbg_atomic(dev, "checking %p\n", state);
 
     for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
         if (new_crtc_state->enable)
             requested_crtc |= drm_crtc_mask(crtc);
     }
 
     for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
         ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
         if (ret) {
             drm_dbg_atomic(dev, "[PLANE:%d:%s] atomic core check failed\n",
                        plane->base.id, plane->name);
             return ret;
         }
     }
 
     for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
         ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
         if (ret) {
             drm_dbg_atomic(dev, "[CRTC:%d:%s] atomic core check failed\n",
                        crtc->base.id, crtc->name);
             return ret;
         }
     }
 
     for_each_new_connector_in_state(state, conn, conn_state, i) {
         ret = drm_atomic_connector_check(conn, conn_state);
         if (ret) {
             drm_dbg_atomic(dev, "[CONNECTOR:%d:%s] atomic core check failed\n",
                        conn->base.id, conn->name);
             return ret;
         }
     }
 
     if (config->funcs->atomic_check) {
         ret = config->funcs->atomic_check(state->dev, state);
 
         if (ret) {
             drm_dbg_atomic(dev, "atomic driver check for %p failed: %d\n",
                        state, ret);
             return ret;
         }
     }
 
     if (!state->allow_modeset) {
         for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
             if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
                 drm_dbg_atomic(dev, "[CRTC:%d:%s] requires full modeset\n",
                            crtc->base.id, crtc->name);
                 return -EINVAL;
             }
         }
     }
 
     for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
         if (new_crtc_state->enable)
             affected_crtc |= drm_crtc_mask(crtc);
     }
 
     /*
      * For commits that allow modesets drivers can add other CRTCs to the
      * atomic commit, e.g. when they need to reallocate global resources.
      * This can cause spurious EBUSY, which robs compositors of a very
      * effective sanity check for their drawing loop. Therefor only allow
      * drivers to add unrelated CRTC states for modeset commits.
      *
      * FIXME: Should add affected_crtc mask to the ATOMIC IOCTL as an output
      * so compositors know what's going on.
      */
     if (affected_crtc != requested_crtc) {
         drm_dbg_atomic(dev,
                    "driver added CRTC to commit: requested 0x%x, affected 0x%0x\n",
                    requested_crtc, affected_crtc);
         WARN(!state->allow_modeset, "adding CRTC not allowed without modesets: requested 0x%x, affected 0x%0x\n",
              requested_crtc, affected_crtc);
     }
 
     return 0;
 }
 EXPORT_SYMBOL(drm_atomic_check_only);
 
 /**
  * drm_atomic_commit - commit configuration atomically
  * @state: atomic configuration to check
  *
  * Note that this function can return -EDEADLK if the driver needed to acquire
  * more locks but encountered a deadlock. The caller must then do the usual w/w
  * backoff dance and restart. All other errors are fatal.
  *
  * This function will take its own reference on @state.
  * Callers should always release their reference with drm_atomic_state_put().
  *
  * Returns:
  * 0 on success, negative error code on failure.
  */
 int drm_atomic_commit(struct drm_atomic_state *state)
 {
     struct drm_mode_config *config = &state->dev->mode_config;
     struct drm_printer p = drm_info_printer(state->dev->dev);
     int ret;
 
     if (drm_debug_enabled(DRM_UT_STATE))
         drm_atomic_print_new_state(state, &p);
 
     ret = drm_atomic_check_only(state);
     if (ret)
         return ret;
 
     drm_dbg_atomic(state->dev, "committing %p\n", state);
 
     return config->funcs->atomic_commit(state->dev, state, false);
 }
 EXPORT_SYMBOL(drm_atomic_commit);
 
 /**
  * drm_atomic_nonblocking_commit - atomic nonblocking commit
  * @state: atomic configuration to check
  *
  * Note that this function can return -EDEADLK if the driver needed to acquire
  * more locks but encountered a deadlock. The caller must then do the usual w/w
  * backoff dance and restart. All other errors are fatal.
  *
  * This function will take its own reference on @state.
  * Callers should always release their reference with drm_atomic_state_put().
  *
  * Returns:
  * 0 on success, negative error code on failure.
  */
 int drm_atomic_nonblocking_commit(struct drm_atomic_state *state)
 {
     struct drm_mode_config *config = &state->dev->mode_config;
     int ret;
 
     ret = drm_atomic_check_only(state);
     if (ret)
         return ret;
 
     drm_dbg_atomic(state->dev, "committing %p nonblocking\n", state);
 
     return config->funcs->atomic_commit(state->dev, state, true);
 }
 EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
 
 /* just used from drm-client and atomic-helper: */
 int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
                       struct drm_plane_state *plane_state)
 {
     int ret;
 
     ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
     if (ret != 0)
         return ret;
 
     drm_atomic_set_fb_for_plane(plane_state, NULL);
     plane_state->crtc_x = 0;
     plane_state->crtc_y = 0;
     plane_state->crtc_w = 0;
     plane_state->crtc_h = 0;
     plane_state->src_x = 0;
     plane_state->src_y = 0;
     plane_state->src_w = 0;
     plane_state->src_h = 0;
 
     return 0;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_disable_plane);
 
 static int update_output_state(struct drm_atomic_state *state,
                    struct drm_mode_set *set)
 {
     struct drm_device *dev = set->crtc->dev;
     struct drm_crtc *crtc;
     struct drm_crtc_state *new_crtc_state;
     struct drm_connector *connector;
     struct drm_connector_state *new_conn_state;
     int ret, i;
 
     ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
                    state->acquire_ctx);
     if (ret)
         return ret;
 
     /* First disable all connectors on the target crtc. */
     ret = drm_atomic_add_affected_connectors(state, set->crtc);
     if (ret)
         return ret;
 
     for_each_new_connector_in_state(state, connector, new_conn_state, i) {
         if (new_conn_state->crtc == set->crtc) {
             ret = drm_atomic_set_crtc_for_connector(new_conn_state,
                                 NULL);
             if (ret)
                 return ret;
 
             /* Make sure legacy setCrtc always re-trains */
             new_conn_state->link_status = DRM_LINK_STATUS_GOOD;
         }
     }
 
     /* Then set all connectors from set->connectors on the target crtc */
     for (i = 0; i < set->num_connectors; i++) {
         new_conn_state = drm_atomic_get_connector_state(state,
                                 set->connectors[i]);
         if (IS_ERR(new_conn_state))
             return PTR_ERR(new_conn_state);
 
         ret = drm_atomic_set_crtc_for_connector(new_conn_state,
                             set->crtc);
         if (ret)
             return ret;
     }
 
     for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
         /*
          * Don't update ->enable for the CRTC in the set_config request,
          * since a mismatch would indicate a bug in the upper layers.
          * The actual modeset code later on will catch any
          * inconsistencies here.
          */
         if (crtc == set->crtc)
             continue;
 
         if (!new_crtc_state->connector_mask) {
             ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state,
                                 NULL);
             if (ret < 0)
                 return ret;
 
             new_crtc_state->active = false;
         }
     }
 
     return 0;
 }
 
 /* just used from drm-client and atomic-helper: */
 int __drm_atomic_helper_set_config(struct drm_mode_set *set,
                    struct drm_atomic_state *state)
 {
     struct drm_crtc_state *crtc_state;
     struct drm_plane_state *primary_state;
     struct drm_crtc *crtc = set->crtc;
     int hdisplay, vdisplay;
     int ret;
 
     crtc_state = drm_atomic_get_crtc_state(state, crtc);
     if (IS_ERR(crtc_state))
         return PTR_ERR(crtc_state);
 
     primary_state = drm_atomic_get_plane_state(state, crtc->primary);
     if (IS_ERR(primary_state))
         return PTR_ERR(primary_state);
 
     if (!set->mode) {
         WARN_ON(set->fb);
         WARN_ON(set->num_connectors);
 
         ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
         if (ret != 0)
             return ret;
 
         crtc_state->active = false;
 
         ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
         if (ret != 0)
             return ret;
 
         drm_atomic_set_fb_for_plane(primary_state, NULL);
 
         goto commit;
     }
 
     WARN_ON(!set->fb);
     WARN_ON(!set->num_connectors);
 
     ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
     if (ret != 0)
         return ret;
 
     crtc_state->active = true;
 
     ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
     if (ret != 0)
         return ret;
 
     drm_mode_get_hv_timing(set->mode, &hdisplay, &vdisplay);
 
     drm_atomic_set_fb_for_plane(primary_state, set->fb);
     primary_state->crtc_x = 0;
     primary_state->crtc_y = 0;
     primary_state->crtc_w = hdisplay;
     primary_state->crtc_h = vdisplay;
     primary_state->src_x = set->x << 16;
     primary_state->src_y = set->y << 16;
     if (drm_rotation_90_or_270(primary_state->rotation)) {
         primary_state->src_w = vdisplay << 16;
         primary_state->src_h = hdisplay << 16;
     } else {
         primary_state->src_w = hdisplay << 16;
         primary_state->src_h = vdisplay << 16;
     }
 
 commit:
     ret = update_output_state(state, set);
     if (ret)
         return ret;
 
     return 0;
 }
 EXPORT_SYMBOL(__drm_atomic_helper_set_config);
 
 static void drm_atomic_private_obj_print_state(struct drm_printer *p,
                            const struct drm_private_state *state)
 {
     struct drm_private_obj *obj = state->obj;
 
     if (obj->funcs->atomic_print_state)
         obj->funcs->atomic_print_state(p, state);
 }
 
 /**
  * drm_atomic_print_new_state - prints drm atomic state
  * @state: atomic configuration to check
  * @p: drm printer
  *
  * This functions prints the drm atomic state snapshot using the drm printer
  * which is passed to it. This snapshot can be used for debugging purposes.
  *
  * Note that this function looks into the new state objects and hence its not
  * safe to be used after the call to drm_atomic_helper_commit_hw_done().
  */
 void drm_atomic_print_new_state(const struct drm_atomic_state *state,
         struct drm_printer *p)
 {
     struct drm_plane *plane;
     struct drm_plane_state *plane_state;
     struct drm_crtc *crtc;
     struct drm_crtc_state *crtc_state;
     struct drm_connector *connector;
     struct drm_connector_state *connector_state;
     struct drm_private_obj *obj;
     struct drm_private_state *obj_state;
     int i;
 
     if (!p) {
         drm_err(state->dev, "invalid drm printer\n");
         return;
     }
 
     drm_dbg_atomic(state->dev, "checking %p\n", state);
 
     for_each_new_plane_in_state(state, plane, plane_state, i)
         drm_atomic_plane_print_state(p, plane_state);
 
     for_each_new_crtc_in_state(state, crtc, crtc_state, i)
         drm_atomic_crtc_print_state(p, crtc_state);
 
     for_each_new_connector_in_state(state, connector, connector_state, i)
         drm_atomic_connector_print_state(p, connector_state);
 
     for_each_new_private_obj_in_state(state, obj, obj_state, i)
         drm_atomic_private_obj_print_state(p, obj_state);
 }
 EXPORT_SYMBOL(drm_atomic_print_new_state);
 
 static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
                  bool take_locks)
 {
     struct drm_mode_config *config = &dev->mode_config;
     struct drm_plane *plane;
     struct drm_crtc *crtc;
     struct drm_connector *connector;
     struct drm_connector_list_iter conn_iter;
 
     if (!drm_drv_uses_atomic_modeset(dev))
         return;
 
     list_for_each_entry(plane, &config->plane_list, head) {
         if (take_locks)
             drm_modeset_lock(&plane->mutex, NULL);
         drm_atomic_plane_print_state(p, plane->state);
         if (take_locks)
             drm_modeset_unlock(&plane->mutex);
     }
 
     list_for_each_entry(crtc, &config->crtc_list, head) {
         if (take_locks)
             drm_modeset_lock(&crtc->mutex, NULL);
         drm_atomic_crtc_print_state(p, crtc->state);
         if (take_locks)
             drm_modeset_unlock(&crtc->mutex);
     }
 
     drm_connector_list_iter_begin(dev, &conn_iter);
     if (take_locks)
         drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
     drm_for_each_connector_iter(connector, &conn_iter)
         drm_atomic_connector_print_state(p, connector->state);
     if (take_locks)
         drm_modeset_unlock(&dev->mode_config.connection_mutex);
     drm_connector_list_iter_end(&conn_iter);
 }
 
 /**
  * drm_state_dump - dump entire device atomic state
  * @dev: the drm device
  * @p: where to print the state to
  *
  * Just for debugging.  Drivers might want an option to dump state
  * to dmesg in case of error irq's.  (Hint, you probably want to
  * ratelimit this!)
  *
  * The caller must wrap this drm_modeset_lock_all_ctx() and
  * drm_modeset_drop_locks(). If this is called from error irq handler, it should
  * not be enabled by default - if you are debugging errors you might
  * not care that this is racey, but calling this without all modeset locks held
  * is inherently unsafe.
  */
 void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
 {
     __drm_state_dump(dev, p, false);
 }
 EXPORT_SYMBOL(drm_state_dump);
 
 #ifdef CONFIG_DEBUG_FS
 static int drm_state_info(struct seq_file *m, void *data)
 {
     struct drm_info_node *node = (struct drm_info_node *) m->private;
     struct drm_device *dev = node->minor->dev;
     struct drm_printer p = drm_seq_file_printer(m);
 
     __drm_state_dump(dev, &p, true);
 
     return 0;
 }
 
 /* any use in debugfs files to dump individual planes/crtc/etc? */
 static const struct drm_info_list drm_atomic_debugfs_list[] = {
     {"state", drm_state_info, 0},
 };
 
 void drm_atomic_debugfs_init(struct drm_minor *minor)
 {
     drm_debugfs_create_files(drm_atomic_debugfs_list,
                  ARRAY_SIZE(drm_atomic_debugfs_list),
                  minor->debugfs_root, minor);
 }
 #endif

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