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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <drm/drm_atomic_helper.h>
#include "i915_drv.h"
#include "intel_clock_gating.h"
#include "intel_display_driver.h"
#include "intel_display_reset.h"
#include "intel_display_types.h"
#include "intel_hotplug.h"
#include "intel_pps.h"
static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
{
return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
intel_has_gpu_reset(to_gt(dev_priv)));
}
void intel_display_reset_prepare(struct drm_i915_private *dev_priv)
{
struct drm_modeset_acquire_ctx *ctx = &dev_priv->display.restore.reset_ctx;
struct drm_atomic_state *state;
int ret;
if (!HAS_DISPLAY(dev_priv))
return;
/* reset doesn't touch the display */
if (!dev_priv->display.params.force_reset_modeset_test &&
!gpu_reset_clobbers_display(dev_priv))
return;
/* We have a modeset vs reset deadlock, defensively unbreak it. */
set_bit(I915_RESET_MODESET, &to_gt(dev_priv)->reset.flags);
smp_mb__after_atomic();
wake_up_bit(&to_gt(dev_priv)->reset.flags, I915_RESET_MODESET);
if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
drm_dbg_kms(&dev_priv->drm,
"Modeset potentially stuck, unbreaking through wedging\n");
intel_gt_set_wedged(to_gt(dev_priv));
}
/*
* Need mode_config.mutex so that we don't
* trample ongoing ->detect() and whatnot.
*/
mutex_lock(&dev_priv->drm.mode_config.mutex);
drm_modeset_acquire_init(ctx, 0);
while (1) {
ret = drm_modeset_lock_all_ctx(&dev_priv->drm, ctx);
if (ret != -EDEADLK)
break;
drm_modeset_backoff(ctx);
}
/*
* Disabling the crtcs gracefully seems nicer. Also the
* g33 docs say we should at least disable all the planes.
*/
state = drm_atomic_helper_duplicate_state(&dev_priv->drm, ctx);
if (IS_ERR(state)) {
ret = PTR_ERR(state);
drm_err(&dev_priv->drm, "Duplicating state failed with %i\n",
ret);
return;
}
ret = drm_atomic_helper_disable_all(&dev_priv->drm, ctx);
if (ret) {
drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
ret);
drm_atomic_state_put(state);
return;
}
dev_priv->display.restore.modeset_state = state;
state->acquire_ctx = ctx;
}
void intel_display_reset_finish(struct drm_i915_private *i915)
{
struct drm_modeset_acquire_ctx *ctx = &i915->display.restore.reset_ctx;
struct drm_atomic_state *state;
int ret;
if (!HAS_DISPLAY(i915))
return;
/* reset doesn't touch the display */
if (!test_bit(I915_RESET_MODESET, &to_gt(i915)->reset.flags))
return;
state = fetch_and_zero(&i915->display.restore.modeset_state);
if (!state)
goto unlock;
/* reset doesn't touch the display */
if (!gpu_reset_clobbers_display(i915)) {
/* for testing only restore the display */
ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
if (ret) {
drm_WARN_ON(&i915->drm, ret == -EDEADLK);
drm_err(&i915->drm,
"Restoring old state failed with %i\n", ret);
}
} else {
/*
* The display has been reset as well,
* so need a full re-initialization.
*/
intel_pps_unlock_regs_wa(i915);
intel_display_driver_init_hw(i915);
intel_clock_gating_init(i915);
intel_hpd_init(i915);
ret = __intel_display_driver_resume(i915, state, ctx);
if (ret)
drm_err(&i915->drm,
"Restoring old state failed with %i\n", ret);
intel_hpd_poll_disable(i915);
}
drm_atomic_state_put(state);
unlock:
drm_modeset_drop_locks(ctx);
drm_modeset_acquire_fini(ctx);
mutex_unlock(&i915->drm.mode_config.mutex);
clear_bit_unlock(I915_RESET_MODESET, &to_gt(i915)->reset.flags);
}
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