1 // SPDX-License-Identifier: MIT
3 * Copyright © 2023 Intel Corporation
6 #include <drm/drm_atomic_helper.h>
9 #include "intel_clock_gating.h"
10 #include "intel_display_driver.h"
11 #include "intel_display_reset.h"
12 #include "intel_display_types.h"
13 #include "intel_hotplug.h"
14 #include "intel_pps.h"
16 static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
18 return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
19 intel_has_gpu_reset(to_gt(dev_priv)));
22 void intel_display_reset_prepare(struct drm_i915_private *dev_priv)
24 struct drm_modeset_acquire_ctx *ctx = &dev_priv->display.restore.reset_ctx;
25 struct drm_atomic_state *state;
28 if (!HAS_DISPLAY(dev_priv))
31 /* reset doesn't touch the display */
32 if (!dev_priv->params.force_reset_modeset_test &&
33 !gpu_reset_clobbers_display(dev_priv))
36 /* We have a modeset vs reset deadlock, defensively unbreak it. */
37 set_bit(I915_RESET_MODESET, &to_gt(dev_priv)->reset.flags);
38 smp_mb__after_atomic();
39 wake_up_bit(&to_gt(dev_priv)->reset.flags, I915_RESET_MODESET);
41 if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
42 drm_dbg_kms(&dev_priv->drm,
43 "Modeset potentially stuck, unbreaking through wedging\n");
44 intel_gt_set_wedged(to_gt(dev_priv));
48 * Need mode_config.mutex so that we don't
49 * trample ongoing ->detect() and whatnot.
51 mutex_lock(&dev_priv->drm.mode_config.mutex);
52 drm_modeset_acquire_init(ctx, 0);
54 ret = drm_modeset_lock_all_ctx(&dev_priv->drm, ctx);
58 drm_modeset_backoff(ctx);
61 * Disabling the crtcs gracefully seems nicer. Also the
62 * g33 docs say we should at least disable all the planes.
64 state = drm_atomic_helper_duplicate_state(&dev_priv->drm, ctx);
67 drm_err(&dev_priv->drm, "Duplicating state failed with %i\n",
72 ret = drm_atomic_helper_disable_all(&dev_priv->drm, ctx);
74 drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
76 drm_atomic_state_put(state);
80 dev_priv->display.restore.modeset_state = state;
81 state->acquire_ctx = ctx;
84 void intel_display_reset_finish(struct drm_i915_private *i915)
86 struct drm_modeset_acquire_ctx *ctx = &i915->display.restore.reset_ctx;
87 struct drm_atomic_state *state;
90 if (!HAS_DISPLAY(i915))
93 /* reset doesn't touch the display */
94 if (!test_bit(I915_RESET_MODESET, &to_gt(i915)->reset.flags))
97 state = fetch_and_zero(&i915->display.restore.modeset_state);
101 /* reset doesn't touch the display */
102 if (!gpu_reset_clobbers_display(i915)) {
103 /* for testing only restore the display */
104 ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
106 drm_WARN_ON(&i915->drm, ret == -EDEADLK);
108 "Restoring old state failed with %i\n", ret);
112 * The display has been reset as well,
113 * so need a full re-initialization.
115 intel_pps_unlock_regs_wa(i915);
116 intel_display_driver_init_hw(i915);
117 intel_clock_gating_init(i915);
118 intel_hpd_init(i915);
120 ret = __intel_display_driver_resume(i915, state, ctx);
123 "Restoring old state failed with %i\n", ret);
125 intel_hpd_poll_disable(i915);
128 drm_atomic_state_put(state);
130 drm_modeset_drop_locks(ctx);
131 drm_modeset_acquire_fini(ctx);
132 mutex_unlock(&i915->drm.mode_config.mutex);
134 clear_bit_unlock(I915_RESET_MODESET, &to_gt(i915)->reset.flags);