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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2023 Intel Corporation4 */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 16static 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 22void 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->display.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't49 * 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 the62 * 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 84void intel_display_reset_finish(struct drm_i915_private *i915)85{86 struct intel_display *display = &i915->display;87 struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;88 struct drm_atomic_state *state;89 int ret;90 91 if (!HAS_DISPLAY(i915))92 return;93 94 /* reset doesn't touch the display */95 if (!test_bit(I915_RESET_MODESET, &to_gt(i915)->reset.flags))96 return;97 98 state = fetch_and_zero(&display->restore.modeset_state);99 if (!state)100 goto unlock;101 102 /* reset doesn't touch the display */103 if (!gpu_reset_clobbers_display(i915)) {104 /* for testing only restore the display */105 ret = drm_atomic_helper_commit_duplicated_state(state, ctx);106 if (ret) {107 drm_WARN_ON(&i915->drm, ret == -EDEADLK);108 drm_err(&i915->drm,109 "Restoring old state failed with %i\n", ret);110 }111 } else {112 /*113 * The display has been reset as well,114 * so need a full re-initialization.115 */116 intel_pps_unlock_regs_wa(display);117 intel_display_driver_init_hw(i915);118 intel_clock_gating_init(i915);119 intel_hpd_init(i915);120 121 ret = __intel_display_driver_resume(i915, state, ctx);122 if (ret)123 drm_err(&i915->drm,124 "Restoring old state failed with %i\n", ret);125 126 intel_hpd_poll_disable(i915);127 }128 129 drm_atomic_state_put(state);130unlock:131 drm_modeset_drop_locks(ctx);132 drm_modeset_acquire_fini(ctx);133 mutex_unlock(&i915->drm.mode_config.mutex);134 135 clear_bit_unlock(I915_RESET_MODESET, &to_gt(i915)->reset.flags);136}137