drivers/gpu/drm/i915/display/intel_modeset_lock.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2023 Intel Corporation
   4  */
   5
   6 #include <drm/drm_modeset_lock.h>
   7
   8 #include "intel_display_types.h"
   9 #include "intel_modeset_lock.h"
  10
  11 void _intel_modeset_lock_begin(struct drm_modeset_acquire_ctx *ctx,
  12                                struct intel_atomic_state *state,
  13                                unsigned int flags, int *ret)
  14 {
  15         drm_modeset_acquire_init(ctx, flags);
  16
  17         if (state)
  18                 state->base.acquire_ctx = ctx;
  19
  20         *ret = -EDEADLK;
  21 }
  22
  23 bool _intel_modeset_lock_loop(int *ret)
  24 {
  25         if (*ret == -EDEADLK) {
  26                 *ret = 0;
  27                 return true;
  28         }
  29
  30         return false;
  31 }
  32
  33 void _intel_modeset_lock_end(struct drm_modeset_acquire_ctx *ctx,
  34                              struct intel_atomic_state *state,
  35                              int *ret)
  36 {
  37         if (*ret == -EDEADLK) {
  38                 if (state)
  39                         drm_atomic_state_clear(&state->base);
  40
  41                 *ret = drm_modeset_backoff(ctx);
  42                 if (*ret == 0) {
  43                         *ret = -EDEADLK;
  44                         return;
  45                 }
  46         }
  47
  48         drm_modeset_drop_locks(ctx);
  49         drm_modeset_acquire_fini(ctx);
  50 }