// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Intel Corporation
 */

#include <linux/dma-fence.h>

#include <drm/drm_crtc.h>
#include <drm/drm_vblank.h>

#include "i915_reg.h"
#include "intel_display_core.h"
#include "intel_display_irq.h"
#include "intel_display_rps.h"
#include "intel_display_types.h"
#include "intel_parent.h"

struct wait_rps_boost {
        struct wait_queue_entry wait;

        struct drm_crtc *crtc;
        struct dma_fence *fence;
};

static int do_rps_boost(struct wait_queue_entry *_wait,
                        unsigned mode, int sync, void *key)
{
        struct wait_rps_boost *wait = container_of(_wait, typeof(*wait), wait);
        struct intel_display *display = to_intel_display(wait->crtc->dev);

        /*
         * If we missed the vblank, but the request is already running it
         * is reasonable to assume that it will complete before the next
         * vblank without our intervention, so leave RPS alone if not started.
         */
        intel_parent_rps_boost_if_not_started(display, wait->fence);

        dma_fence_put(wait->fence);

        drm_crtc_vblank_put(wait->crtc);

        list_del(&wait->wait.entry);
        kfree(wait);
        return 1;
}

void intel_display_rps_boost_after_vblank(struct drm_crtc *crtc,
                                          struct dma_fence *fence)
{
        struct intel_display *display = to_intel_display(crtc->dev);
        struct wait_rps_boost *wait;

        if (!intel_parent_rps_available(display))
                return;

        if (DISPLAY_VER(display) < 6)
                return;

        if (drm_crtc_vblank_get(crtc))
                return;

        wait = kmalloc_obj(*wait);
        if (!wait) {
                drm_crtc_vblank_put(crtc);
                return;
        }

        wait->fence = dma_fence_get(fence);
        wait->crtc = crtc;

        wait->wait.func = do_rps_boost;
        wait->wait.flags = 0;

        add_wait_queue(drm_crtc_vblank_waitqueue(crtc), &wait->wait);
}

void intel_display_rps_mark_interactive(struct intel_display *display,
                                        struct intel_atomic_state *state,
                                        bool interactive)
{
        if (!intel_parent_rps_available(display))
                return;

        if (state->rps_interactive == interactive)
                return;

        intel_parent_rps_mark_interactive(display, interactive);

        state->rps_interactive = interactive;
}

void ilk_display_rps_enable(struct intel_display *display)
{
        spin_lock(&display->irq.lock);
        ilk_enable_display_irq(display, DE_PCU_EVENT);
        spin_unlock(&display->irq.lock);
}

void ilk_display_rps_disable(struct intel_display *display)
{
        spin_lock(&display->irq.lock);
        ilk_disable_display_irq(display, DE_PCU_EVENT);
        spin_unlock(&display->irq.lock);
}

void ilk_display_rps_irq_handler(struct intel_display *display)
{
        intel_parent_rps_ilk_irq_handler(display);
}