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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_cx0_phy.h"
#include "intel_display_driver.h"
#include "intel_display_reset.h"
#include "intel_display_types.h"
#include "intel_hotplug.h"
#include "intel_pps.h"
bool intel_display_reset_test(struct intel_display *display)
{
return display->params.force_reset_modeset_test;
}
/* returns true if intel_display_reset_finish() needs to be called */
bool intel_display_reset_prepare(struct intel_display *display,
modeset_stuck_fn modeset_stuck, void *context)
{
struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
struct drm_atomic_state *state;
int ret;
if (!HAS_DISPLAY(display))
return false;
if (atomic_read(&display->restore.pending_fb_pin)) {
drm_dbg_kms(display->drm,
"Modeset potentially stuck, unbreaking through wedging\n");
modeset_stuck(context);
}
/*
* Need mode_config.mutex so that we don't
* trample ongoing ->detect() and whatnot.
*/
mutex_lock(&display->drm->mode_config.mutex);
drm_modeset_acquire_init(ctx, 0);
while (1) {
ret = drm_modeset_lock_all_ctx(display->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(display->drm, ctx);
if (IS_ERR(state)) {
ret = PTR_ERR(state);
drm_err(display->drm, "Duplicating state failed with %i\n",
ret);
return true;
}
ret = drm_atomic_helper_disable_all(display->drm, ctx);
if (ret) {
drm_err(display->drm, "Suspending crtc's failed with %i\n",
ret);
drm_atomic_state_put(state);
return true;
}
display->restore.modeset_state = state;
state->acquire_ctx = ctx;
return true;
}
void intel_display_reset_finish(struct intel_display *display, bool test_only)
{
struct drm_i915_private *i915 = to_i915(display->drm);
struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
struct drm_atomic_state *state;
int ret;
if (!HAS_DISPLAY(display))
return;
state = fetch_and_zero(&display->restore.modeset_state);
if (!state)
goto unlock;
/* reset doesn't touch the display */
if (test_only) {
/* for testing only restore the display */
ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
if (ret) {
drm_WARN_ON(display->drm, ret == -EDEADLK);
drm_err(display->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(display);
intel_display_driver_init_hw(display);
intel_clock_gating_init(i915);
intel_cx0_pll_power_save_wa(display);
intel_hpd_init(i915);
ret = __intel_display_driver_resume(display, state, ctx);
if (ret)
drm_err(display->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(&display->drm->mode_config.mutex);
}
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