1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #include <drm/drm_atomic_helper.h> 7 8 #include "i915_drv.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" 15 16 static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv) 17 { 18 return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display && 19 intel_has_gpu_reset(to_gt(dev_priv))); 20 } 21 22 void intel_display_reset_prepare(struct drm_i915_private *dev_priv) 23 { 24 struct drm_modeset_acquire_ctx *ctx = &dev_priv->display.restore.reset_ctx; 25 struct drm_atomic_state *state; 26 int ret; 27 28 if (!HAS_DISPLAY(dev_priv)) 29 return; 30 31 /* reset doesn't touch the display */ 32 if (!dev_priv->params.force_reset_modeset_test && 33 !gpu_reset_clobbers_display(dev_priv)) 34 return; 35 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); 40 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)); 45 } 46 47 /* 48 * Need mode_config.mutex so that we don't 49 * trample ongoing ->detect() and whatnot. 50 */ 51 mutex_lock(&dev_priv->drm.mode_config.mutex); 52 drm_modeset_acquire_init(ctx, 0); 53 while (1) { 54 ret = drm_modeset_lock_all_ctx(&dev_priv->drm, ctx); 55 if (ret != -EDEADLK) 56 break; 57 58 drm_modeset_backoff(ctx); 59 } 60 /* 61 * Disabling the crtcs gracefully seems nicer. Also the 62 * g33 docs say we should at least disable all the planes. 63 */ 64 state = drm_atomic_helper_duplicate_state(&dev_priv->drm, ctx); 65 if (IS_ERR(state)) { 66 ret = PTR_ERR(state); 67 drm_err(&dev_priv->drm, "Duplicating state failed with %i\n", 68 ret); 69 return; 70 } 71 72 ret = drm_atomic_helper_disable_all(&dev_priv->drm, ctx); 73 if (ret) { 74 drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n", 75 ret); 76 drm_atomic_state_put(state); 77 return; 78 } 79 80 dev_priv->display.restore.modeset_state = state; 81 state->acquire_ctx = ctx; 82 } 83 84 void intel_display_reset_finish(struct drm_i915_private *i915) 85 { 86 struct drm_modeset_acquire_ctx *ctx = &i915->display.restore.reset_ctx; 87 struct drm_atomic_state *state; 88 int ret; 89 90 if (!HAS_DISPLAY(i915)) 91 return; 92 93 /* reset doesn't touch the display */ 94 if (!test_bit(I915_RESET_MODESET, &to_gt(i915)->reset.flags)) 95 return; 96 97 state = fetch_and_zero(&i915->display.restore.modeset_state); 98 if (!state) 99 goto unlock; 100 101 /* 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); 105 if (ret) { 106 drm_WARN_ON(&i915->drm, ret == -EDEADLK); 107 drm_err(&i915->drm, 108 "Restoring old state failed with %i\n", ret); 109 } 110 } else { 111 /* 112 * The display has been reset as well, 113 * so need a full re-initialization. 114 */ 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); 119 120 ret = __intel_display_driver_resume(i915, state, ctx); 121 if (ret) 122 drm_err(&i915->drm, 123 "Restoring old state failed with %i\n", ret); 124 125 intel_hpd_poll_disable(i915); 126 } 127 128 drm_atomic_state_put(state); 129 unlock: 130 drm_modeset_drop_locks(ctx); 131 drm_modeset_acquire_fini(ctx); 132 mutex_unlock(&i915->drm.mode_config.mutex); 133 134 clear_bit_unlock(I915_RESET_MODESET, &to_gt(i915)->reset.flags); 135 } 136