/*
 * Copyright 2015 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

/* The caprices of the preprocessor require that this be declared right here */
#define CREATE_TRACE_POINTS

#include "dm_services_types.h"
#include "dc.h"
#include "dc/inc/core_types.h"
#include "dal_asic_id.h"
#include "dmub/dmub_srv.h"
#include "dc/inc/hw/dmcu.h"
#include "dc/inc/hw/abm.h"
#include "dc/dc_dmub_srv.h"

#include "vid.h"
#include "amdgpu.h"
#include "amdgpu_display.h"
#include "amdgpu_ucode.h"
#include "atom.h"
#include "amdgpu_dm.h"
#ifdef CONFIG_DRM_AMD_DC_HDCP
#include "amdgpu_dm_hdcp.h"
#include <drm/drm_hdcp.h>
#endif
#include "amdgpu_pm.h"

#include "amd_shared.h"
#include "amdgpu_dm_irq.h"
#include "dm_helpers.h"
#include "amdgpu_dm_mst_types.h"
#if defined(CONFIG_DEBUG_FS)
#include "amdgpu_dm_debugfs.h"
#endif

#include "ivsrcid/ivsrcid_vislands30.h"

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/pm_runtime.h>
#include <linux/pci.h>
#include <linux/firmware.h>
#include <linux/component.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_dp_mst_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_edid.h>
#include <drm/drm_vblank.h>
#include <drm/drm_audio_component.h>
#include <drm/drm_hdcp.h>

#if defined(CONFIG_DRM_AMD_DC_DCN)
#include "ivsrcid/dcn/irqsrcs_dcn_1_0.h"

#include "dcn/dcn_1_0_offset.h"
#include "dcn/dcn_1_0_sh_mask.h"
#include "soc15_hw_ip.h"
#include "vega10_ip_offset.h"

#include "soc15_common.h"
#endif

#include "modules/inc/mod_freesync.h"
#include "modules/power/power_helpers.h"
#include "modules/inc/mod_info_packet.h"

#define FIRMWARE_RENOIR_DMUB "amdgpu/renoir_dmcub.bin"
MODULE_FIRMWARE(FIRMWARE_RENOIR_DMUB);

#define FIRMWARE_RAVEN_DMCU             "amdgpu/raven_dmcu.bin"
MODULE_FIRMWARE(FIRMWARE_RAVEN_DMCU);

#define FIRMWARE_NAVI12_DMCU            "amdgpu/navi12_dmcu.bin"
MODULE_FIRMWARE(FIRMWARE_NAVI12_DMCU);

/* Number of bytes in PSP header for firmware. */
#define PSP_HEADER_BYTES 0x100

/* Number of bytes in PSP footer for firmware. */
#define PSP_FOOTER_BYTES 0x100

/**
 * DOC: overview
 *
 * The AMDgpu display manager, **amdgpu_dm** (or even simpler,
 * **dm**) sits between DRM and DC. It acts as a liason, converting DRM
 * requests into DC requests, and DC responses into DRM responses.
 *
 * The root control structure is &struct amdgpu_display_manager.
 */

/* basic init/fini API */
static int amdgpu_dm_init(struct amdgpu_device *adev);
static void amdgpu_dm_fini(struct amdgpu_device *adev);

/*
 * initializes drm_device display related structures, based on the information
 * provided by DAL. The drm strcutures are: drm_crtc, drm_connector,
 * drm_encoder, drm_mode_config
 *
 * Returns 0 on success
 */
static int amdgpu_dm_initialize_drm_device(struct amdgpu_device *adev);
/* removes and deallocates the drm structures, created by the above function */
static void amdgpu_dm_destroy_drm_device(struct amdgpu_display_manager *dm);

static int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
                                struct drm_plane *plane,
                                unsigned long possible_crtcs,
                                const struct dc_plane_cap *plane_cap);
static int amdgpu_dm_crtc_init(struct amdgpu_display_manager *dm,
                               struct drm_plane *plane,
                               uint32_t link_index);
static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
                                    struct amdgpu_dm_connector *amdgpu_dm_connector,
                                    uint32_t link_index,
                                    struct amdgpu_encoder *amdgpu_encoder);
static int amdgpu_dm_encoder_init(struct drm_device *dev,
                                  struct amdgpu_encoder *aencoder,
                                  uint32_t link_index);

static int amdgpu_dm_connector_get_modes(struct drm_connector *connector);

static int amdgpu_dm_atomic_commit(struct drm_device *dev,
                                   struct drm_atomic_state *state,
                                   bool nonblock);

static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state);

static int amdgpu_dm_atomic_check(struct drm_device *dev,
                                  struct drm_atomic_state *state);

static void handle_cursor_update(struct drm_plane *plane,
                                 struct drm_plane_state *old_plane_state);

static void amdgpu_dm_set_psr_caps(struct dc_link *link);
static bool amdgpu_dm_psr_enable(struct dc_stream_state *stream);
static bool amdgpu_dm_link_setup_psr(struct dc_stream_state *stream);
static bool amdgpu_dm_psr_disable(struct dc_stream_state *stream);


/*
 * dm_vblank_get_counter
 *
 * @brief
 * Get counter for number of vertical blanks
 *
 * @param
 * struct amdgpu_device *adev - [in] desired amdgpu device
 * int disp_idx - [in] which CRTC to get the counter from
 *
 * @return
 * Counter for vertical blanks
 */
static u32 dm_vblank_get_counter(struct amdgpu_device *adev, int crtc)
{
        if (crtc >= adev->mode_info.num_crtc)
                return 0;
        else {
                struct amdgpu_crtc *acrtc = adev->mode_info.crtcs[crtc];
                struct dm_crtc_state *acrtc_state = to_dm_crtc_state(
                                acrtc->base.state);


                if (acrtc_state->stream == NULL) {
                        DRM_ERROR("dc_stream_state is NULL for crtc '%d'!\n",
                                  crtc);
                        return 0;
                }

                return dc_stream_get_vblank_counter(acrtc_state->stream);
        }
}

static int dm_crtc_get_scanoutpos(struct amdgpu_device *adev, int crtc,
                                  u32 *vbl, u32 *position)
{
        uint32_t v_blank_start, v_blank_end, h_position, v_position;

        if ((crtc < 0) || (crtc >= adev->mode_info.num_crtc))
                return -EINVAL;
        else {
                struct amdgpu_crtc *acrtc = adev->mode_info.crtcs[crtc];
                struct dm_crtc_state *acrtc_state = to_dm_crtc_state(
                                                acrtc->base.state);

                if (acrtc_state->stream ==  NULL) {
                        DRM_ERROR("dc_stream_state is NULL for crtc '%d'!\n",
                                  crtc);
                        return 0;
                }

                /*
                 * TODO rework base driver to use values directly.
                 * for now parse it back into reg-format
                 */
                dc_stream_get_scanoutpos(acrtc_state->stream,
                                         &v_blank_start,
                                         &v_blank_end,
                                         &h_position,
                                         &v_position);

                *position = v_position | (h_position << 16);
                *vbl = v_blank_start | (v_blank_end << 16);
        }

        return 0;
}

static bool dm_is_idle(void *handle)
{
        /* XXX todo */
        return true;
}

static int dm_wait_for_idle(void *handle)
{
        /* XXX todo */
        return 0;
}

static bool dm_check_soft_reset(void *handle)
{
        return false;
}

static int dm_soft_reset(void *handle)
{
        /* XXX todo */
        return 0;
}

static struct amdgpu_crtc *
get_crtc_by_otg_inst(struct amdgpu_device *adev,
                     int otg_inst)
{
        struct drm_device *dev = adev->ddev;
        struct drm_crtc *crtc;
        struct amdgpu_crtc *amdgpu_crtc;

        if (otg_inst == -1) {
                WARN_ON(1);
                return adev->mode_info.crtcs[0];
        }

        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
                amdgpu_crtc = to_amdgpu_crtc(crtc);

                if (amdgpu_crtc->otg_inst == otg_inst)
                        return amdgpu_crtc;
        }

        return NULL;
}

static inline bool amdgpu_dm_vrr_active(struct dm_crtc_state *dm_state)
{
        return dm_state->freesync_config.state == VRR_STATE_ACTIVE_VARIABLE ||
               dm_state->freesync_config.state == VRR_STATE_ACTIVE_FIXED;
}

/**
 * dm_pflip_high_irq() - Handle pageflip interrupt
 * @interrupt_params: ignored
 *
 * Handles the pageflip interrupt by notifying all interested parties
 * that the pageflip has been completed.
 */
static void dm_pflip_high_irq(void *interrupt_params)
{
        struct amdgpu_crtc *amdgpu_crtc;
        struct common_irq_params *irq_params = interrupt_params;
        struct amdgpu_device *adev = irq_params->adev;
        unsigned long flags;
        struct drm_pending_vblank_event *e;
        struct dm_crtc_state *acrtc_state;
        uint32_t vpos, hpos, v_blank_start, v_blank_end;
        bool vrr_active;

        amdgpu_crtc = get_crtc_by_otg_inst(adev, irq_params->irq_src - IRQ_TYPE_PFLIP);

        /* IRQ could occur when in initial stage */
        /* TODO work and BO cleanup */
        if (amdgpu_crtc == NULL) {
                DRM_DEBUG_DRIVER("CRTC is null, returning.\n");
                return;
        }

        spin_lock_irqsave(&adev->ddev->event_lock, flags);

        if (amdgpu_crtc->pflip_status != AMDGPU_FLIP_SUBMITTED){
                DRM_DEBUG_DRIVER("amdgpu_crtc->pflip_status = %d !=AMDGPU_FLIP_SUBMITTED(%d) on crtc:%d[%p] \n",
                                                 amdgpu_crtc->pflip_status,
                                                 AMDGPU_FLIP_SUBMITTED,
                                                 amdgpu_crtc->crtc_id,
                                                 amdgpu_crtc);
                spin_unlock_irqrestore(&adev->ddev->event_lock, flags);
                return;
        }

        /* page flip completed. */
        e = amdgpu_crtc->event;
        amdgpu_crtc->event = NULL;

        if (!e)
                WARN_ON(1);

        acrtc_state = to_dm_crtc_state(amdgpu_crtc->base.state);
        vrr_active = amdgpu_dm_vrr_active(acrtc_state);

        /* Fixed refresh rate, or VRR scanout position outside front-porch? */
        if (!vrr_active ||
            !dc_stream_get_scanoutpos(acrtc_state->stream, &v_blank_start,
                                      &v_blank_end, &hpos, &vpos) ||
            (vpos < v_blank_start)) {
                /* Update to correct count and vblank timestamp if racing with
                 * vblank irq. This also updates to the correct vblank timestamp
                 * even in VRR mode, as scanout is past the front-porch atm.
                 */
                drm_crtc_accurate_vblank_count(&amdgpu_crtc->base);

                /* Wake up userspace by sending the pageflip event with proper
                 * count and timestamp of vblank of flip completion.
                 */
                if (e) {
                        drm_crtc_send_vblank_event(&amdgpu_crtc->base, e);

                        /* Event sent, so done with vblank for this flip */
                        drm_crtc_vblank_put(&amdgpu_crtc->base);
                }
        } else if (e) {
                /* VRR active and inside front-porch: vblank count and
                 * timestamp for pageflip event will only be up to date after
                 * drm_crtc_handle_vblank() has been executed from late vblank
                 * irq handler after start of back-porch (vline 0). We queue the
                 * pageflip event for send-out by drm_crtc_handle_vblank() with
                 * updated timestamp and count, once it runs after us.
                 *
                 * We need to open-code this instead of using the helper
                 * drm_crtc_arm_vblank_event(), as that helper would
                 * call drm_crtc_accurate_vblank_count(), which we must
                 * not call in VRR mode while we are in front-porch!
                 */

                /* sequence will be replaced by real count during send-out. */
                e->sequence = drm_crtc_vblank_count(&amdgpu_crtc->base);
                e->pipe = amdgpu_crtc->crtc_id;

                list_add_tail(&e->base.link, &adev->ddev->vblank_event_list);
                e = NULL;
        }

        /* Keep track of vblank of this flip for flip throttling. We use the
         * cooked hw counter, as that one incremented at start of this vblank
         * of pageflip completion, so last_flip_vblank is the forbidden count
         * for queueing new pageflips if vsync + VRR is enabled.
         */
        amdgpu_crtc->last_flip_vblank =
                amdgpu_get_vblank_counter_kms(&amdgpu_crtc->base);

        amdgpu_crtc->pflip_status = AMDGPU_FLIP_NONE;
        spin_unlock_irqrestore(&adev->ddev->event_lock, flags);

        DRM_DEBUG_DRIVER("crtc:%d[%p], pflip_stat:AMDGPU_FLIP_NONE, vrr[%d]-fp %d\n",
                         amdgpu_crtc->crtc_id, amdgpu_crtc,
                         vrr_active, (int) !e);
}

static void dm_vupdate_high_irq(void *interrupt_params)
{
        struct common_irq_params *irq_params = interrupt_params;
        struct amdgpu_device *adev = irq_params->adev;
        struct amdgpu_crtc *acrtc;
        struct dm_crtc_state *acrtc_state;
        unsigned long flags;

        acrtc = get_crtc_by_otg_inst(adev, irq_params->irq_src - IRQ_TYPE_VUPDATE);

        if (acrtc) {
                acrtc_state = to_dm_crtc_state(acrtc->base.state);

                DRM_DEBUG_VBL("crtc:%d, vupdate-vrr:%d\n",
                              acrtc->crtc_id,
                              amdgpu_dm_vrr_active(acrtc_state));

                /* Core vblank handling is done here after end of front-porch in
                 * vrr mode, as vblank timestamping will give valid results
                 * while now done after front-porch. This will also deliver
                 * page-flip completion events that have been queued to us
                 * if a pageflip happened inside front-porch.
                 */
                if (amdgpu_dm_vrr_active(acrtc_state)) {
                        drm_crtc_handle_vblank(&acrtc->base);

                        /* BTR processing for pre-DCE12 ASICs */
                        if (acrtc_state->stream &&
                            adev->family < AMDGPU_FAMILY_AI) {
                                spin_lock_irqsave(&adev->ddev->event_lock, flags);
                                mod_freesync_handle_v_update(
                                    adev->dm.freesync_module,
                                    acrtc_state->stream,
                                    &acrtc_state->vrr_params);

                                dc_stream_adjust_vmin_vmax(
                                    adev->dm.dc,
                                    acrtc_state->stream,
                                    &acrtc_state->vrr_params.adjust);
                                spin_unlock_irqrestore(&adev->ddev->event_lock, flags);
                        }
                }
        }
}

/**
 * dm_crtc_high_irq() - Handles CRTC interrupt
 * @interrupt_params: used for determining the CRTC instance
 *
 * Handles the CRTC/VSYNC interrupt by notfying DRM's VBLANK
 * event handler.
 */
static void dm_crtc_high_irq(void *interrupt_params)
{
        struct common_irq_params *irq_params = interrupt_params;
        struct amdgpu_device *adev = irq_params->adev;
        struct amdgpu_crtc *acrtc;
        struct dm_crtc_state *acrtc_state;
        unsigned long flags;

        acrtc = get_crtc_by_otg_inst(adev, irq_params->irq_src - IRQ_TYPE_VBLANK);
        if (!acrtc)
                return;

        acrtc_state = to_dm_crtc_state(acrtc->base.state);

        DRM_DEBUG_VBL("crtc:%d, vupdate-vrr:%d, planes:%d\n", acrtc->crtc_id,
                         amdgpu_dm_vrr_active(acrtc_state),
                         acrtc_state->active_planes);

        /**
         * Core vblank handling at start of front-porch is only possible
         * in non-vrr mode, as only there vblank timestamping will give
         * valid results while done in front-porch. Otherwise defer it
         * to dm_vupdate_high_irq after end of front-porch.
         */
        if (!amdgpu_dm_vrr_active(acrtc_state))
                drm_crtc_handle_vblank(&acrtc->base);

        /**
         * Following stuff must happen at start of vblank, for crc
         * computation and below-the-range btr support in vrr mode.
         */
        amdgpu_dm_crtc_handle_crc_irq(&acrtc->base);

        /* BTR updates need to happen before VUPDATE on Vega and above. */
        if (adev->family < AMDGPU_FAMILY_AI)
                return;

        spin_lock_irqsave(&adev->ddev->event_lock, flags);

        if (acrtc_state->stream && acrtc_state->vrr_params.supported &&
            acrtc_state->freesync_config.state == VRR_STATE_ACTIVE_VARIABLE) {
                mod_freesync_handle_v_update(adev->dm.freesync_module,
                                             acrtc_state->stream,
                                             &acrtc_state->vrr_params);

                dc_stream_adjust_vmin_vmax(adev->dm.dc, acrtc_state->stream,
                                           &acrtc_state->vrr_params.adjust);
        }

        /*
         * If there aren't any active_planes then DCH HUBP may be clock-gated.
         * In that case, pageflip completion interrupts won't fire and pageflip
         * completion events won't get delivered. Prevent this by sending
         * pending pageflip events from here if a flip is still pending.
         *
         * If any planes are enabled, use dm_pflip_high_irq() instead, to
         * avoid race conditions between flip programming and completion,
         * which could cause too early flip completion events.
         */
        if (adev->family >= AMDGPU_FAMILY_RV &&
            acrtc->pflip_status == AMDGPU_FLIP_SUBMITTED &&
            acrtc_state->active_planes == 0) {
                if (acrtc->event) {
                        drm_crtc_send_vblank_event(&acrtc->base, acrtc->event);
                        acrtc->event = NULL;
                        drm_crtc_vblank_put(&acrtc->base);
                }
                acrtc->pflip_status = AMDGPU_FLIP_NONE;
        }

        spin_unlock_irqrestore(&adev->ddev->event_lock, flags);
}

static int dm_set_clockgating_state(void *handle,
                  enum amd_clockgating_state state)
{
        return 0;
}

static int dm_set_powergating_state(void *handle,
                  enum amd_powergating_state state)
{
        return 0;
}

/* Prototypes of private functions */
static int dm_early_init(void* handle);

/* Allocate memory for FBC compressed data  */
static void amdgpu_dm_fbc_init(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct amdgpu_device *adev = dev->dev_private;
        struct dm_comressor_info *compressor = &adev->dm.compressor;
        struct amdgpu_dm_connector *aconn = to_amdgpu_dm_connector(connector);
        struct drm_display_mode *mode;
        unsigned long max_size = 0;

        if (adev->dm.dc->fbc_compressor == NULL)
                return;

        if (aconn->dc_link->connector_signal != SIGNAL_TYPE_EDP)
                return;

        if (compressor->bo_ptr)
                return;


        list_for_each_entry(mode, &connector->modes, head) {
                if (max_size < mode->htotal * mode->vtotal)
                        max_size = mode->htotal * mode->vtotal;
        }

        if (max_size) {
                int r = amdgpu_bo_create_kernel(adev, max_size * 4, PAGE_SIZE,
                            AMDGPU_GEM_DOMAIN_GTT, &compressor->bo_ptr,
                            &compressor->gpu_addr, &compressor->cpu_addr);

                if (r)
                        DRM_ERROR("DM: Failed to initialize FBC\n");
                else {
                        adev->dm.dc->ctx->fbc_gpu_addr = compressor->gpu_addr;
                        DRM_INFO("DM: FBC alloc %lu\n", max_size*4);
                }

        }

}

static int amdgpu_dm_audio_component_get_eld(struct device *kdev, int port,
                                          int pipe, bool *enabled,
                                          unsigned char *buf, int max_bytes)
{
        struct drm_device *dev = dev_get_drvdata(kdev);
        struct amdgpu_device *adev = dev->dev_private;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        struct amdgpu_dm_connector *aconnector;
        int ret = 0;

        *enabled = false;

        mutex_lock(&adev->dm.audio_lock);

        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                aconnector = to_amdgpu_dm_connector(connector);
                if (aconnector->audio_inst != port)
                        continue;

                *enabled = true;
                ret = drm_eld_size(connector->eld);
                memcpy(buf, connector->eld, min(max_bytes, ret));

                break;
        }
        drm_connector_list_iter_end(&conn_iter);

        mutex_unlock(&adev->dm.audio_lock);

        DRM_DEBUG_KMS("Get ELD : idx=%d ret=%d en=%d\n", port, ret, *enabled);

        return ret;
}

static const struct drm_audio_component_ops amdgpu_dm_audio_component_ops = {
        .get_eld = amdgpu_dm_audio_component_get_eld,
};

static int amdgpu_dm_audio_component_bind(struct device *kdev,
                                       struct device *hda_kdev, void *data)
{
        struct drm_device *dev = dev_get_drvdata(kdev);
        struct amdgpu_device *adev = dev->dev_private;
        struct drm_audio_component *acomp = data;

        acomp->ops = &amdgpu_dm_audio_component_ops;
        acomp->dev = kdev;
        adev->dm.audio_component = acomp;

        return 0;
}

static void amdgpu_dm_audio_component_unbind(struct device *kdev,
                                          struct device *hda_kdev, void *data)
{
        struct drm_device *dev = dev_get_drvdata(kdev);
        struct amdgpu_device *adev = dev->dev_private;
        struct drm_audio_component *acomp = data;

        acomp->ops = NULL;
        acomp->dev = NULL;
        adev->dm.audio_component = NULL;
}

static const struct component_ops amdgpu_dm_audio_component_bind_ops = {
        .bind   = amdgpu_dm_audio_component_bind,
        .unbind = amdgpu_dm_audio_component_unbind,
};

static int amdgpu_dm_audio_init(struct amdgpu_device *adev)
{
        int i, ret;

        if (!amdgpu_audio)
                return 0;

        adev->mode_info.audio.enabled = true;

        adev->mode_info.audio.num_pins = adev->dm.dc->res_pool->audio_count;

        for (i = 0; i < adev->mode_info.audio.num_pins; i++) {
                adev->mode_info.audio.pin[i].channels = -1;
                adev->mode_info.audio.pin[i].rate = -1;
                adev->mode_info.audio.pin[i].bits_per_sample = -1;
                adev->mode_info.audio.pin[i].status_bits = 0;
                adev->mode_info.audio.pin[i].category_code = 0;
                adev->mode_info.audio.pin[i].connected = false;
                adev->mode_info.audio.pin[i].id =
                        adev->dm.dc->res_pool->audios[i]->inst;
                adev->mode_info.audio.pin[i].offset = 0;
        }

        ret = component_add(adev->dev, &amdgpu_dm_audio_component_bind_ops);
        if (ret < 0)
                return ret;

        adev->dm.audio_registered = true;

        return 0;
}

static void amdgpu_dm_audio_fini(struct amdgpu_device *adev)
{
        if (!amdgpu_audio)
                return;

        if (!adev->mode_info.audio.enabled)
                return;

        if (adev->dm.audio_registered) {
                component_del(adev->dev, &amdgpu_dm_audio_component_bind_ops);
                adev->dm.audio_registered = false;
        }

        /* TODO: Disable audio? */

        adev->mode_info.audio.enabled = false;
}

void amdgpu_dm_audio_eld_notify(struct amdgpu_device *adev, int pin)
{
        struct drm_audio_component *acomp = adev->dm.audio_component;

        if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify) {
                DRM_DEBUG_KMS("Notify ELD: %d\n", pin);

                acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
                                                 pin, -1);
        }
}

static int dm_dmub_hw_init(struct amdgpu_device *adev)
{
        const struct dmcub_firmware_header_v1_0 *hdr;
        struct dmub_srv *dmub_srv = adev->dm.dmub_srv;
        struct dmub_srv_fb_info *fb_info = adev->dm.dmub_fb_info;
        const struct firmware *dmub_fw = adev->dm.dmub_fw;
        struct dmcu *dmcu = adev->dm.dc->res_pool->dmcu;
        struct abm *abm = adev->dm.dc->res_pool->abm;
        struct dmub_srv_hw_params hw_params;
        enum dmub_status status;
        const unsigned char *fw_inst_const, *fw_bss_data;
        uint32_t i, fw_inst_const_size, fw_bss_data_size;
        bool has_hw_support;

        if (!dmub_srv)
                /* DMUB isn't supported on the ASIC. */
                return 0;

        if (!fb_info) {
                DRM_ERROR("No framebuffer info for DMUB service.\n");
                return -EINVAL;
        }

        if (!dmub_fw) {
                /* Firmware required for DMUB support. */
                DRM_ERROR("No firmware provided for DMUB.\n");
                return -EINVAL;
        }

        status = dmub_srv_has_hw_support(dmub_srv, &has_hw_support);
        if (status != DMUB_STATUS_OK) {
                DRM_ERROR("Error checking HW support for DMUB: %d\n", status);
                return -EINVAL;
        }

        if (!has_hw_support) {
                DRM_INFO("DMUB unsupported on ASIC\n");
                return 0;
        }

        hdr = (const struct dmcub_firmware_header_v1_0 *)dmub_fw->data;

        fw_inst_const = dmub_fw->data +
                        le32_to_cpu(hdr->header.ucode_array_offset_bytes) +
                        PSP_HEADER_BYTES;

        fw_bss_data = dmub_fw->data +
                      le32_to_cpu(hdr->header.ucode_array_offset_bytes) +
                      le32_to_cpu(hdr->inst_const_bytes);

        /* Copy firmware and bios info into FB memory. */
        fw_inst_const_size = le32_to_cpu(hdr->inst_const_bytes) -
                             PSP_HEADER_BYTES - PSP_FOOTER_BYTES;

        fw_bss_data_size = le32_to_cpu(hdr->bss_data_bytes);

        /* if adev->firmware.load_type == AMDGPU_FW_LOAD_PSP,
         * amdgpu_ucode_init_single_fw will load dmub firmware
         * fw_inst_const part to cw0; otherwise, the firmware back door load
         * will be done by dm_dmub_hw_init
         */
        if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP) {
                memcpy(fb_info->fb[DMUB_WINDOW_0_INST_CONST].cpu_addr, fw_inst_const,
                                fw_inst_const_size);
        }

        if (fw_bss_data_size)
                memcpy(fb_info->fb[DMUB_WINDOW_2_BSS_DATA].cpu_addr,
                       fw_bss_data, fw_bss_data_size);

        /* Copy firmware bios info into FB memory. */
        memcpy(fb_info->fb[DMUB_WINDOW_3_VBIOS].cpu_addr, adev->bios,
               adev->bios_size);

        /* Reset regions that need to be reset. */
        memset(fb_info->fb[DMUB_WINDOW_4_MAILBOX].cpu_addr, 0,
        fb_info->fb[DMUB_WINDOW_4_MAILBOX].size);

        memset(fb_info->fb[DMUB_WINDOW_5_TRACEBUFF].cpu_addr, 0,
               fb_info->fb[DMUB_WINDOW_5_TRACEBUFF].size);

        memset(fb_info->fb[DMUB_WINDOW_6_FW_STATE].cpu_addr, 0,
               fb_info->fb[DMUB_WINDOW_6_FW_STATE].size);

        /* Initialize hardware. */
        memset(&hw_params, 0, sizeof(hw_params));
        hw_params.fb_base = adev->gmc.fb_start;
        hw_params.fb_offset = adev->gmc.aper_base;

        /* backdoor load firmware and trigger dmub running */
        if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP)
                hw_params.load_inst_const = true;

        if (dmcu)
                hw_params.psp_version = dmcu->psp_version;

        for (i = 0; i < fb_info->num_fb; ++i)
                hw_params.fb[i] = &fb_info->fb[i];

        status = dmub_srv_hw_init(dmub_srv, &hw_params);
        if (status != DMUB_STATUS_OK) {
                DRM_ERROR("Error initializing DMUB HW: %d\n", status);
                return -EINVAL;
        }

        /* Wait for firmware load to finish. */
        status = dmub_srv_wait_for_auto_load(dmub_srv, 100000);
        if (status != DMUB_STATUS_OK)
                DRM_WARN("Wait for DMUB auto-load failed: %d\n", status);

        /* Init DMCU and ABM if available. */
        if (dmcu && abm) {
                dmcu->funcs->dmcu_init(dmcu);
                abm->dmcu_is_running = dmcu->funcs->is_dmcu_initialized(dmcu);
        }

        adev->dm.dc->ctx->dmub_srv = dc_dmub_srv_create(adev->dm.dc, dmub_srv);
        if (!adev->dm.dc->ctx->dmub_srv) {
                DRM_ERROR("Couldn't allocate DC DMUB server!\n");
                return -ENOMEM;
        }

        DRM_INFO("DMUB hardware initialized: version=0x%08X\n",
                 adev->dm.dmcub_fw_version);

        return 0;
}

static int amdgpu_dm_init(struct amdgpu_device *adev)
{
        struct dc_init_data init_data;
#ifdef CONFIG_DRM_AMD_DC_HDCP
        struct dc_callback_init init_params;
#endif
        int r;

        adev->dm.ddev = adev->ddev;
        adev->dm.adev = adev;

        /* Zero all the fields */
        memset(&init_data, 0, sizeof(init_data));
#ifdef CONFIG_DRM_AMD_DC_HDCP
        memset(&init_params, 0, sizeof(init_params));
#endif

        mutex_init(&adev->dm.dc_lock);
        mutex_init(&adev->dm.audio_lock);

        if(amdgpu_dm_irq_init(adev)) {
                DRM_ERROR("amdgpu: failed to initialize DM IRQ support.\n");
                goto error;
        }

        init_data.asic_id.chip_family = adev->family;

        init_data.asic_id.pci_revision_id = adev->pdev->revision;
        init_data.asic_id.hw_internal_rev = adev->external_rev_id;

        init_data.asic_id.vram_width = adev->gmc.vram_width;
        /* TODO: initialize init_data.asic_id.vram_type here!!!! */
        init_data.asic_id.atombios_base_address =
                adev->mode_info.atom_context->bios;

        init_data.driver = adev;

        adev->dm.cgs_device = amdgpu_cgs_create_device(adev);

        if (!adev->dm.cgs_device) {
                DRM_ERROR("amdgpu: failed to create cgs device.\n");
                goto error;
        }

        init_data.cgs_device = adev->dm.cgs_device;

        init_data.dce_environment = DCE_ENV_PRODUCTION_DRV;

        switch (adev->asic_type) {
        case CHIP_CARRIZO:
        case CHIP_STONEY:
        case CHIP_RAVEN:
        case CHIP_RENOIR:
                init_data.flags.gpu_vm_support = true;
                break;
        default:
                break;
        }

        if (amdgpu_dc_feature_mask & DC_FBC_MASK)
                init_data.flags.fbc_support = true;

        if (amdgpu_dc_feature_mask & DC_MULTI_MON_PP_MCLK_SWITCH_MASK)
                init_data.flags.multi_mon_pp_mclk_switch = true;

        if (amdgpu_dc_feature_mask & DC_DISABLE_FRACTIONAL_PWM_MASK)
                init_data.flags.disable_fractional_pwm = true;

        init_data.flags.power_down_display_on_boot = true;

        init_data.soc_bounding_box = adev->dm.soc_bounding_box;

        /* Display Core create. */
        adev->dm.dc = dc_create(&init_data);

        if (adev->dm.dc) {
                DRM_INFO("Display Core initialized with v%s!\n", DC_VER);
        } else {
                DRM_INFO("Display Core failed to initialize with v%s!\n", DC_VER);
                goto error;
        }

        if (amdgpu_dc_debug_mask & DC_DISABLE_PIPE_SPLIT) {
                adev->dm.dc->debug.force_single_disp_pipe_split = false;
                adev->dm.dc->debug.pipe_split_policy = MPC_SPLIT_AVOID;
        }

        if (adev->asic_type != CHIP_CARRIZO && adev->asic_type != CHIP_STONEY)
                adev->dm.dc->debug.disable_stutter = amdgpu_pp_feature_mask & PP_STUTTER_MODE ? false : true;

        if (amdgpu_dc_debug_mask & DC_DISABLE_STUTTER)
                adev->dm.dc->debug.disable_stutter = true;

        if (amdgpu_dc_debug_mask & DC_DISABLE_DSC)
                adev->dm.dc->debug.disable_dsc = true;

        if (amdgpu_dc_debug_mask & DC_DISABLE_CLOCK_GATING)
                adev->dm.dc->debug.disable_clock_gate = true;

        r = dm_dmub_hw_init(adev);
        if (r) {
                DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);
                goto error;
        }

        dc_hardware_init(adev->dm.dc);

        adev->dm.freesync_module = mod_freesync_create(adev->dm.dc);
        if (!adev->dm.freesync_module) {
                DRM_ERROR(
                "amdgpu: failed to initialize freesync_module.\n");
        } else
                DRM_DEBUG_DRIVER("amdgpu: freesync_module init done %p.\n",
                                adev->dm.freesync_module);

        amdgpu_dm_init_color_mod();

#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (adev->asic_type >= CHIP_RAVEN) {
                adev->dm.hdcp_workqueue = hdcp_create_workqueue(adev, &init_params.cp_psp, adev->dm.dc);

                if (!adev->dm.hdcp_workqueue)
                        DRM_ERROR("amdgpu: failed to initialize hdcp_workqueue.\n");
                else
                        DRM_DEBUG_DRIVER("amdgpu: hdcp_workqueue init done %p.\n", adev->dm.hdcp_workqueue);

                dc_init_callbacks(adev->dm.dc, &init_params);
        }
#endif
        if (amdgpu_dm_initialize_drm_device(adev)) {
                DRM_ERROR(
                "amdgpu: failed to initialize sw for display support.\n");
                goto error;
        }

        /* Update the actual used number of crtc */
        adev->mode_info.num_crtc = adev->dm.display_indexes_num;

        /* create fake encoders for MST */
        dm_dp_create_fake_mst_encoders(adev);

        /* TODO: Add_display_info? */

        /* TODO use dynamic cursor width */
        adev->ddev->mode_config.cursor_width = adev->dm.dc->caps.max_cursor_size;
        adev->ddev->mode_config.cursor_height = adev->dm.dc->caps.max_cursor_size;

        if (drm_vblank_init(adev->ddev, adev->dm.display_indexes_num)) {
                DRM_ERROR(
                "amdgpu: failed to initialize sw for display support.\n");
                goto error;
        }

        DRM_DEBUG_DRIVER("KMS initialized.\n");

        return 0;
error:
        amdgpu_dm_fini(adev);

        return -EINVAL;
}

static void amdgpu_dm_fini(struct amdgpu_device *adev)
{
        int i;

        for (i = 0; i < adev->dm.display_indexes_num; i++) {
                drm_encoder_cleanup(&adev->dm.mst_encoders[i].base);
        }

        amdgpu_dm_audio_fini(adev);

        amdgpu_dm_destroy_drm_device(&adev->dm);

#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (adev->dm.hdcp_workqueue) {
                hdcp_destroy(adev->dm.hdcp_workqueue);
                adev->dm.hdcp_workqueue = NULL;
        }

        if (adev->dm.dc)
                dc_deinit_callbacks(adev->dm.dc);
#endif
        if (adev->dm.dc->ctx->dmub_srv) {
                dc_dmub_srv_destroy(&adev->dm.dc->ctx->dmub_srv);
                adev->dm.dc->ctx->dmub_srv = NULL;
        }

        if (adev->dm.dmub_bo)
                amdgpu_bo_free_kernel(&adev->dm.dmub_bo,
                                      &adev->dm.dmub_bo_gpu_addr,
                                      &adev->dm.dmub_bo_cpu_addr);

        /* DC Destroy TODO: Replace destroy DAL */
        if (adev->dm.dc)
                dc_destroy(&adev->dm.dc);
        /*
         * TODO: pageflip, vlank interrupt
         *
         * amdgpu_dm_irq_fini(adev);
         */

        if (adev->dm.cgs_device) {
                amdgpu_cgs_destroy_device(adev->dm.cgs_device);
                adev->dm.cgs_device = NULL;
        }
        if (adev->dm.freesync_module) {
                mod_freesync_destroy(adev->dm.freesync_module);
                adev->dm.freesync_module = NULL;
        }

        mutex_destroy(&adev->dm.audio_lock);
        mutex_destroy(&adev->dm.dc_lock);

        return;
}

static int load_dmcu_fw(struct amdgpu_device *adev)
{
        const char *fw_name_dmcu = NULL;
        int r;
        const struct dmcu_firmware_header_v1_0 *hdr;

        switch(adev->asic_type) {
        case CHIP_BONAIRE:
        case CHIP_HAWAII:
        case CHIP_KAVERI:
        case CHIP_KABINI:
        case CHIP_MULLINS:
        case CHIP_TONGA:
        case CHIP_FIJI:
        case CHIP_CARRIZO:
        case CHIP_STONEY:
        case CHIP_POLARIS11:
        case CHIP_POLARIS10:
        case CHIP_POLARIS12:
        case CHIP_VEGAM:
        case CHIP_VEGA10:
        case CHIP_VEGA12:
        case CHIP_VEGA20:
        case CHIP_NAVI10:
        case CHIP_NAVI14:
        case CHIP_RENOIR:
                return 0;
        case CHIP_NAVI12:
                fw_name_dmcu = FIRMWARE_NAVI12_DMCU;
                break;
        case CHIP_RAVEN:
                if (ASICREV_IS_PICASSO(adev->external_rev_id))
                        fw_name_dmcu = FIRMWARE_RAVEN_DMCU;
                else if (ASICREV_IS_RAVEN2(adev->external_rev_id))
                        fw_name_dmcu = FIRMWARE_RAVEN_DMCU;
                else
                        return 0;
                break;
        default:
                DRM_ERROR("Unsupported ASIC type: 0x%X\n", adev->asic_type);
                return -EINVAL;
        }

        if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP) {
                DRM_DEBUG_KMS("dm: DMCU firmware not supported on direct or SMU loading\n");
                return 0;
        }

        r = request_firmware_direct(&adev->dm.fw_dmcu, fw_name_dmcu, adev->dev);
        if (r == -ENOENT) {
                /* DMCU firmware is not necessary, so don't raise a fuss if it's missing */
                DRM_DEBUG_KMS("dm: DMCU firmware not found\n");
                adev->dm.fw_dmcu = NULL;
                return 0;
        }
        if (r) {
                dev_err(adev->dev, "amdgpu_dm: Can't load firmware \"%s\"\n",
                        fw_name_dmcu);
                return r;
        }

        r = amdgpu_ucode_validate(adev->dm.fw_dmcu);
        if (r) {
                dev_err(adev->dev, "amdgpu_dm: Can't validate firmware \"%s\"\n",
                        fw_name_dmcu);
                release_firmware(adev->dm.fw_dmcu);
                adev->dm.fw_dmcu = NULL;
                return r;
        }

        hdr = (const struct dmcu_firmware_header_v1_0 *)adev->dm.fw_dmcu->data;
        adev->firmware.ucode[AMDGPU_UCODE_ID_DMCU_ERAM].ucode_id = AMDGPU_UCODE_ID_DMCU_ERAM;
        adev->firmware.ucode[AMDGPU_UCODE_ID_DMCU_ERAM].fw = adev->dm.fw_dmcu;
        adev->firmware.fw_size +=
                ALIGN(le32_to_cpu(hdr->header.ucode_size_bytes) - le32_to_cpu(hdr->intv_size_bytes), PAGE_SIZE);

        adev->firmware.ucode[AMDGPU_UCODE_ID_DMCU_INTV].ucode_id = AMDGPU_UCODE_ID_DMCU_INTV;
        adev->firmware.ucode[AMDGPU_UCODE_ID_DMCU_INTV].fw = adev->dm.fw_dmcu;
        adev->firmware.fw_size +=
                ALIGN(le32_to_cpu(hdr->intv_size_bytes), PAGE_SIZE);

        adev->dm.dmcu_fw_version = le32_to_cpu(hdr->header.ucode_version);

        DRM_DEBUG_KMS("PSP loading DMCU firmware\n");

        return 0;
}

static uint32_t amdgpu_dm_dmub_reg_read(void *ctx, uint32_t address)
{
        struct amdgpu_device *adev = ctx;

        return dm_read_reg(adev->dm.dc->ctx, address);
}

static void amdgpu_dm_dmub_reg_write(void *ctx, uint32_t address,
                                     uint32_t value)
{
        struct amdgpu_device *adev = ctx;

        return dm_write_reg(adev->dm.dc->ctx, address, value);
}

static int dm_dmub_sw_init(struct amdgpu_device *adev)
{
        struct dmub_srv_create_params create_params;
        struct dmub_srv_region_params region_params;
        struct dmub_srv_region_info region_info;
        struct dmub_srv_fb_params fb_params;
        struct dmub_srv_fb_info *fb_info;
        struct dmub_srv *dmub_srv;
        const struct dmcub_firmware_header_v1_0 *hdr;
        const char *fw_name_dmub;
        enum dmub_asic dmub_asic;
        enum dmub_status status;
        int r;

        switch (adev->asic_type) {
        case CHIP_RENOIR:
                dmub_asic = DMUB_ASIC_DCN21;
                fw_name_dmub = FIRMWARE_RENOIR_DMUB;
                break;

        default:
                /* ASIC doesn't support DMUB. */
                return 0;
        }

        r = request_firmware_direct(&adev->dm.dmub_fw, fw_name_dmub, adev->dev);
        if (r) {
                DRM_ERROR("DMUB firmware loading failed: %d\n", r);
                return 0;
        }

        r = amdgpu_ucode_validate(adev->dm.dmub_fw);
        if (r) {
                DRM_ERROR("Couldn't validate DMUB firmware: %d\n", r);
                return 0;
        }

        hdr = (const struct dmcub_firmware_header_v1_0 *)adev->dm.dmub_fw->data;

        if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
                adev->firmware.ucode[AMDGPU_UCODE_ID_DMCUB].ucode_id =
                        AMDGPU_UCODE_ID_DMCUB;
                adev->firmware.ucode[AMDGPU_UCODE_ID_DMCUB].fw =
                        adev->dm.dmub_fw;
                adev->firmware.fw_size +=
                        ALIGN(le32_to_cpu(hdr->inst_const_bytes), PAGE_SIZE);

                DRM_INFO("Loading DMUB firmware via PSP: version=0x%08X\n",
                         adev->dm.dmcub_fw_version);
        }

        adev->dm.dmcub_fw_version = le32_to_cpu(hdr->header.ucode_version);

        adev->dm.dmub_srv = kzalloc(sizeof(*adev->dm.dmub_srv), GFP_KERNEL);
        dmub_srv = adev->dm.dmub_srv;

        if (!dmub_srv) {
                DRM_ERROR("Failed to allocate DMUB service!\n");
                return -ENOMEM;
        }

        memset(&create_params, 0, sizeof(create_params));
        create_params.user_ctx = adev;
        create_params.funcs.reg_read = amdgpu_dm_dmub_reg_read;
        create_params.funcs.reg_write = amdgpu_dm_dmub_reg_write;
        create_params.asic = dmub_asic;

        /* Create the DMUB service. */
        status = dmub_srv_create(dmub_srv, &create_params);
        if (status != DMUB_STATUS_OK) {
                DRM_ERROR("Error creating DMUB service: %d\n", status);
                return -EINVAL;
        }

        /* Calculate the size of all the regions for the DMUB service. */
        memset(&region_params, 0, sizeof(region_params));

        region_params.inst_const_size = le32_to_cpu(hdr->inst_const_bytes) -
                                        PSP_HEADER_BYTES - PSP_FOOTER_BYTES;
        region_params.bss_data_size = le32_to_cpu(hdr->bss_data_bytes);
        region_params.vbios_size = adev->bios_size;
        region_params.fw_bss_data =
                adev->dm.dmub_fw->data +
                le32_to_cpu(hdr->header.ucode_array_offset_bytes) +
                le32_to_cpu(hdr->inst_const_bytes);
        region_params.fw_inst_const =
                adev->dm.dmub_fw->data +
                le32_to_cpu(hdr->header.ucode_array_offset_bytes) +
                PSP_HEADER_BYTES;

        status = dmub_srv_calc_region_info(dmub_srv, &region_params,
                                           &region_info);

        if (status != DMUB_STATUS_OK) {
                DRM_ERROR("Error calculating DMUB region info: %d\n", status);
                return -EINVAL;
        }

        /*
         * Allocate a framebuffer based on the total size of all the regions.
         * TODO: Move this into GART.
         */
        r = amdgpu_bo_create_kernel(adev, region_info.fb_size, PAGE_SIZE,
                                    AMDGPU_GEM_DOMAIN_VRAM, &adev->dm.dmub_bo,
                                    &adev->dm.dmub_bo_gpu_addr,
                                    &adev->dm.dmub_bo_cpu_addr);
        if (r)
                return r;

        /* Rebase the regions on the framebuffer address. */
        memset(&fb_params, 0, sizeof(fb_params));
        fb_params.cpu_addr = adev->dm.dmub_bo_cpu_addr;
        fb_params.gpu_addr = adev->dm.dmub_bo_gpu_addr;
        fb_params.region_info = &region_info;

        adev->dm.dmub_fb_info =
                kzalloc(sizeof(*adev->dm.dmub_fb_info), GFP_KERNEL);
        fb_info = adev->dm.dmub_fb_info;

        if (!fb_info) {
                DRM_ERROR(
                        "Failed to allocate framebuffer info for DMUB service!\n");
                return -ENOMEM;
        }

        status = dmub_srv_calc_fb_info(dmub_srv, &fb_params, fb_info);
        if (status != DMUB_STATUS_OK) {
                DRM_ERROR("Error calculating DMUB FB info: %d\n", status);
                return -EINVAL;
        }

        return 0;
}

static int dm_sw_init(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        int r;

        r = dm_dmub_sw_init(adev);
        if (r)
                return r;

        return load_dmcu_fw(adev);
}

static int dm_sw_fini(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        kfree(adev->dm.dmub_fb_info);
        adev->dm.dmub_fb_info = NULL;

        if (adev->dm.dmub_srv) {
                dmub_srv_destroy(adev->dm.dmub_srv);
                adev->dm.dmub_srv = NULL;
        }

        if (adev->dm.dmub_fw) {
                release_firmware(adev->dm.dmub_fw);
                adev->dm.dmub_fw = NULL;
        }

        if(adev->dm.fw_dmcu) {
                release_firmware(adev->dm.fw_dmcu);
                adev->dm.fw_dmcu = NULL;
        }

        return 0;
}

static int detect_mst_link_for_all_connectors(struct drm_device *dev)
{
        struct amdgpu_dm_connector *aconnector;
        struct drm_connector *connector;
        struct drm_connector_list_iter iter;
        int ret = 0;

        drm_connector_list_iter_begin(dev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                aconnector = to_amdgpu_dm_connector(connector);
                if (aconnector->dc_link->type == dc_connection_mst_branch &&
                    aconnector->mst_mgr.aux) {
                        DRM_DEBUG_DRIVER("DM_MST: starting TM on aconnector: %p [id: %d]\n",
                                         aconnector,
                                         aconnector->base.base.id);

                        ret = drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_mgr, true);
                        if (ret < 0) {
                                DRM_ERROR("DM_MST: Failed to start MST\n");
                                aconnector->dc_link->type =
                                        dc_connection_single;
                                break;
                        }
                }
        }
        drm_connector_list_iter_end(&iter);

        return ret;
}

static int dm_late_init(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        struct dmcu_iram_parameters params;
        unsigned int linear_lut[16];
        int i;
        struct dmcu *dmcu = NULL;
        bool ret;

        if (!adev->dm.fw_dmcu && !adev->dm.dmub_fw)
                return detect_mst_link_for_all_connectors(adev->ddev);

        dmcu = adev->dm.dc->res_pool->dmcu;

        for (i = 0; i < 16; i++)
                linear_lut[i] = 0xFFFF * i / 15;

        params.set = 0;
        params.backlight_ramping_start = 0xCCCC;
        params.backlight_ramping_reduction = 0xCCCCCCCC;
        params.backlight_lut_array_size = 16;
        params.backlight_lut_array = linear_lut;

        /* Min backlight level after ABM reduction,  Don't allow below 1%
         * 0xFFFF x 0.01 = 0x28F
         */
        params.min_abm_backlight = 0x28F;

        ret = dmcu_load_iram(dmcu, params);

        if (!ret)
                return -EINVAL;

        return detect_mst_link_for_all_connectors(adev->ddev);
}

static void s3_handle_mst(struct drm_device *dev, bool suspend)
{
        struct amdgpu_dm_connector *aconnector;
        struct drm_connector *connector;
        struct drm_connector_list_iter iter;
        struct drm_dp_mst_topology_mgr *mgr;
        int ret;
        bool need_hotplug = false;

        drm_connector_list_iter_begin(dev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                aconnector = to_amdgpu_dm_connector(connector);
                if (aconnector->dc_link->type != dc_connection_mst_branch ||
                    aconnector->mst_port)
                        continue;

                mgr = &aconnector->mst_mgr;

                if (suspend) {
                        drm_dp_mst_topology_mgr_suspend(mgr);
                } else {
                        ret = drm_dp_mst_topology_mgr_resume(mgr, true);
                        if (ret < 0) {
                                drm_dp_mst_topology_mgr_set_mst(mgr, false);
                                need_hotplug = true;
                        }
                }
        }
        drm_connector_list_iter_end(&iter);

        if (need_hotplug)
                drm_kms_helper_hotplug_event(dev);
}

static int amdgpu_dm_smu_write_watermarks_table(struct amdgpu_device *adev)
{
        struct smu_context *smu = &adev->smu;
        int ret = 0;

        if (!is_support_sw_smu(adev))
                return 0;

        /* This interface is for dGPU Navi1x.Linux dc-pplib interface depends
         * on window driver dc implementation.
         * For Navi1x, clock settings of dcn watermarks are fixed. the settings
         * should be passed to smu during boot up and resume from s3.
         * boot up: dc calculate dcn watermark clock settings within dc_create,
         * dcn20_resource_construct
         * then call pplib functions below to pass the settings to smu:
         * smu_set_watermarks_for_clock_ranges
         * smu_set_watermarks_table
         * navi10_set_watermarks_table
         * smu_write_watermarks_table
         *
         * For Renoir, clock settings of dcn watermark are also fixed values.
         * dc has implemented different flow for window driver:
         * dc_hardware_init / dc_set_power_state
         * dcn10_init_hw
         * notify_wm_ranges
         * set_wm_ranges
         * -- Linux
         * smu_set_watermarks_for_clock_ranges
         * renoir_set_watermarks_table
         * smu_write_watermarks_table
         *
         * For Linux,
         * dc_hardware_init -> amdgpu_dm_init
         * dc_set_power_state --> dm_resume
         *
         * therefore, this function apply to navi10/12/14 but not Renoir
         * *
         */
        switch(adev->asic_type) {
        case CHIP_NAVI10:
        case CHIP_NAVI14:
        case CHIP_NAVI12:
                break;
        default:
                return 0;
        }

        mutex_lock(&smu->mutex);

        /* pass data to smu controller */
        if ((smu->watermarks_bitmap & WATERMARKS_EXIST) &&
                        !(smu->watermarks_bitmap & WATERMARKS_LOADED)) {
                ret = smu_write_watermarks_table(smu);

                if (ret) {
                        mutex_unlock(&smu->mutex);
                        DRM_ERROR("Failed to update WMTABLE!\n");
                        return ret;
                }
                smu->watermarks_bitmap |= WATERMARKS_LOADED;
        }

        mutex_unlock(&smu->mutex);

        return 0;
}

/**
 * dm_hw_init() - Initialize DC device
 * @handle: The base driver device containing the amdgpu_dm device.
 *
 * Initialize the &struct amdgpu_display_manager device. This involves calling
 * the initializers of each DM component, then populating the struct with them.
 *
 * Although the function implies hardware initialization, both hardware and
 * software are initialized here. Splitting them out to their relevant init
 * hooks is a future TODO item.
 *
 * Some notable things that are initialized here:
 *
 * - Display Core, both software and hardware
 * - DC modules that we need (freesync and color management)
 * - DRM software states
 * - Interrupt sources and handlers
 * - Vblank support
 * - Debug FS entries, if enabled
 */
static int dm_hw_init(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;
        /* Create DAL display manager */
        amdgpu_dm_init(adev);
        amdgpu_dm_hpd_init(adev);

        return 0;
}

/**
 * dm_hw_fini() - Teardown DC device
 * @handle: The base driver device containing the amdgpu_dm device.
 *
 * Teardown components within &struct amdgpu_display_manager that require
 * cleanup. This involves cleaning up the DRM device, DC, and any modules that
 * were loaded. Also flush IRQ workqueues and disable them.
 */
static int dm_hw_fini(void *handle)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)handle;

        amdgpu_dm_hpd_fini(adev);

        amdgpu_dm_irq_fini(adev);
        amdgpu_dm_fini(adev);
        return 0;
}


static int dm_enable_vblank(struct drm_crtc *crtc);
static void dm_disable_vblank(struct drm_crtc *crtc);

static void dm_gpureset_toggle_interrupts(struct amdgpu_device *adev,
                                 struct dc_state *state, bool enable)
{
        enum dc_irq_source irq_source;
        struct amdgpu_crtc *acrtc;
        int rc = -EBUSY;
        int i = 0;

        for (i = 0; i < state->stream_count; i++) {
                acrtc = get_crtc_by_otg_inst(
                                adev, state->stream_status[i].primary_otg_inst);

                if (acrtc && state->stream_status[i].plane_count != 0) {
                        irq_source = IRQ_TYPE_PFLIP + acrtc->otg_inst;
                        rc = dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY;
                        DRM_DEBUG("crtc %d - vupdate irq %sabling: r=%d\n",
                                  acrtc->crtc_id, enable ? "en" : "dis", rc);
                        if (rc)
                                DRM_WARN("Failed to %s pflip interrupts\n",
                                         enable ? "enable" : "disable");

                        if (enable) {
                                rc = dm_enable_vblank(&acrtc->base);
                                if (rc)
                                        DRM_WARN("Failed to enable vblank interrupts\n");
                        } else {
                                dm_disable_vblank(&acrtc->base);
                        }

                }
        }

}

enum dc_status amdgpu_dm_commit_zero_streams(struct dc *dc)
{
        struct dc_state *context = NULL;
        enum dc_status res = DC_ERROR_UNEXPECTED;
        int i;
        struct dc_stream_state *del_streams[MAX_PIPES];
        int del_streams_count = 0;

        memset(del_streams, 0, sizeof(del_streams));

        context = dc_create_state(dc);
        if (context == NULL)
                goto context_alloc_fail;

        dc_resource_state_copy_construct_current(dc, context);

        /* First remove from context all streams */
        for (i = 0; i < context->stream_count; i++) {
                struct dc_stream_state *stream = context->streams[i];

                del_streams[del_streams_count++] = stream;
        }

        /* Remove all planes for removed streams and then remove the streams */
        for (i = 0; i < del_streams_count; i++) {
                if (!dc_rem_all_planes_for_stream(dc, del_streams[i], context)) {
                        res = DC_FAIL_DETACH_SURFACES;
                        goto fail;
                }

                res = dc_remove_stream_from_ctx(dc, context, del_streams[i]);
                if (res != DC_OK)
                        goto fail;
        }


        res = dc_validate_global_state(dc, context, false);

        if (res != DC_OK) {
                DRM_ERROR("%s:resource validation failed, dc_status:%d\n", __func__, res);
                goto fail;
        }

        res = dc_commit_state(dc, context);

fail:
        dc_release_state(context);

context_alloc_fail:
        return res;
}

static int dm_suspend(void *handle)
{
        struct amdgpu_device *adev = handle;
        struct amdgpu_display_manager *dm = &adev->dm;
        int ret = 0;

        if (adev->in_gpu_reset) {
                mutex_lock(&dm->dc_lock);
                dm->cached_dc_state = dc_copy_state(dm->dc->current_state);

                dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, false);

                amdgpu_dm_commit_zero_streams(dm->dc);

                amdgpu_dm_irq_suspend(adev);

                return ret;
        }

        WARN_ON(adev->dm.cached_state);
        adev->dm.cached_state = drm_atomic_helper_suspend(adev->ddev);

        s3_handle_mst(adev->ddev, true);

        amdgpu_dm_irq_suspend(adev);


        dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);

        return 0;
}

static struct amdgpu_dm_connector *
amdgpu_dm_find_first_crtc_matching_connector(struct drm_atomic_state *state,
                                             struct drm_crtc *crtc)
{
        uint32_t i;
        struct drm_connector_state *new_con_state;
        struct drm_connector *connector;
        struct drm_crtc *crtc_from_state;

        for_each_new_connector_in_state(state, connector, new_con_state, i) {
                crtc_from_state = new_con_state->crtc;

                if (crtc_from_state == crtc)
                        return to_amdgpu_dm_connector(connector);
        }

        return NULL;
}

static void emulated_link_detect(struct dc_link *link)
{
        struct dc_sink_init_data sink_init_data = { 0 };
        struct display_sink_capability sink_caps = { 0 };
        enum dc_edid_status edid_status;
        struct dc_context *dc_ctx = link->ctx;
        struct dc_sink *sink = NULL;
        struct dc_sink *prev_sink = NULL;

        link->type = dc_connection_none;
        prev_sink = link->local_sink;

        if (prev_sink != NULL)
                dc_sink_retain(prev_sink);

        switch (link->connector_signal) {
        case SIGNAL_TYPE_HDMI_TYPE_A: {
                sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
                sink_caps.signal = SIGNAL_TYPE_HDMI_TYPE_A;
                break;
        }

        case SIGNAL_TYPE_DVI_SINGLE_LINK: {
                sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
                sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
                break;
        }

        case SIGNAL_TYPE_DVI_DUAL_LINK: {
                sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
                sink_caps.signal = SIGNAL_TYPE_DVI_DUAL_LINK;
                break;
        }

        case SIGNAL_TYPE_LVDS: {
                sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
                sink_caps.signal = SIGNAL_TYPE_LVDS;
                break;
        }

        case SIGNAL_TYPE_EDP: {
                sink_caps.transaction_type =
                        DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
                sink_caps.signal = SIGNAL_TYPE_EDP;
                break;
        }

        case SIGNAL_TYPE_DISPLAY_PORT: {
                sink_caps.transaction_type =
                        DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
                sink_caps.signal = SIGNAL_TYPE_VIRTUAL;
                break;
        }

        default:
                DC_ERROR("Invalid connector type! signal:%d\n",
                        link->connector_signal);
                return;
        }

        sink_init_data.link = link;
        sink_init_data.sink_signal = sink_caps.signal;

        sink = dc_sink_create(&sink_init_data);
        if (!sink) {
                DC_ERROR("Failed to create sink!\n");
                return;
        }

        /* dc_sink_create returns a new reference */
        link->local_sink = sink;

        edid_status = dm_helpers_read_local_edid(
                        link->ctx,
                        link,
                        sink);

        if (edid_status != EDID_OK)
                DC_ERROR("Failed to read EDID");

}

static void dm_gpureset_commit_state(struct dc_state *dc_state,
                                     struct amdgpu_display_manager *dm)
{
        struct {
                struct dc_surface_update surface_updates[MAX_SURFACES];
                struct dc_plane_info plane_infos[MAX_SURFACES];
                struct dc_scaling_info scaling_infos[MAX_SURFACES];
                struct dc_flip_addrs flip_addrs[MAX_SURFACES];
                struct dc_stream_update stream_update;
        } * bundle;
        int k, m;

        bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);

        if (!bundle) {
                dm_error("Failed to allocate update bundle\n");
                goto cleanup;
        }

        for (k = 0; k < dc_state->stream_count; k++) {
                bundle->stream_update.stream = dc_state->streams[k];

                for (m = 0; m < dc_state->stream_status->plane_count; m++) {
                        bundle->surface_updates[m].surface =
                                dc_state->stream_status->plane_states[m];
                        bundle->surface_updates[m].surface->force_full_update =
                                true;
                }
                dc_commit_updates_for_stream(
                        dm->dc, bundle->surface_updates,
                        dc_state->stream_status->plane_count,
                        dc_state->streams[k], &bundle->stream_update, dc_state);
        }

cleanup:
        kfree(bundle);

        return;
}

static int dm_resume(void *handle)
{
        struct amdgpu_device *adev = handle;
        struct drm_device *ddev = adev->ddev;
        struct amdgpu_display_manager *dm = &adev->dm;
        struct amdgpu_dm_connector *aconnector;
        struct drm_connector *connector;
        struct drm_connector_list_iter iter;
        struct drm_crtc *crtc;
        struct drm_crtc_state *new_crtc_state;
        struct dm_crtc_state *dm_new_crtc_state;
        struct drm_plane *plane;
        struct drm_plane_state *new_plane_state;
        struct dm_plane_state *dm_new_plane_state;
        struct dm_atomic_state *dm_state = to_dm_atomic_state(dm->atomic_obj.state);
        enum dc_connection_type new_connection_type = dc_connection_none;
        struct dc_state *dc_state;
        int i, r, j;

        if (adev->in_gpu_reset) {
                dc_state = dm->cached_dc_state;

                r = dm_dmub_hw_init(adev);
                if (r)
                        DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);

                dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);
                dc_resume(dm->dc);

                amdgpu_dm_irq_resume_early(adev);

                for (i = 0; i < dc_state->stream_count; i++) {
                        dc_state->streams[i]->mode_changed = true;
                        for (j = 0; j < dc_state->stream_status->plane_count; j++) {
                                dc_state->stream_status->plane_states[j]->update_flags.raw
                                        = 0xffffffff;
                        }
                }

                WARN_ON(!dc_commit_state(dm->dc, dc_state));

                dm_gpureset_commit_state(dm->cached_dc_state, dm);

                dm_gpureset_toggle_interrupts(adev, dm->cached_dc_state, true);

                dc_release_state(dm->cached_dc_state);
                dm->cached_dc_state = NULL;

                amdgpu_dm_irq_resume_late(adev);

                mutex_unlock(&dm->dc_lock);

                return 0;
        }
        /* Recreate dc_state - DC invalidates it when setting power state to S3. */
        dc_release_state(dm_state->context);
        dm_state->context = dc_create_state(dm->dc);
        /* TODO: Remove dc_state->dccg, use dc->dccg directly. */
        dc_resource_state_construct(dm->dc, dm_state->context);

        /* Before powering on DC we need to re-initialize DMUB. */
        r = dm_dmub_hw_init(adev);
        if (r)
                DRM_ERROR("DMUB interface failed to initialize: status=%d\n", r);

        /* power on hardware */
        dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D0);

        /* program HPD filter */
        dc_resume(dm->dc);

        /*
         * early enable HPD Rx IRQ, should be done before set mode as short
         * pulse interrupts are used for MST
         */
        amdgpu_dm_irq_resume_early(adev);

        /* On resume we need to rewrite the MSTM control bits to enable MST*/
        s3_handle_mst(ddev, false);

        /* Do detection*/
        drm_connector_list_iter_begin(ddev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                aconnector = to_amdgpu_dm_connector(connector);

                /*
                 * this is the case when traversing through already created
                 * MST connectors, should be skipped
                 */
                if (aconnector->mst_port)
                        continue;

                mutex_lock(&aconnector->hpd_lock);
                if (!dc_link_detect_sink(aconnector->dc_link, &new_connection_type))
                        DRM_ERROR("KMS: Failed to detect connector\n");

                if (aconnector->base.force && new_connection_type == dc_connection_none)
                        emulated_link_detect(aconnector->dc_link);
                else
                        dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);

                if (aconnector->fake_enable && aconnector->dc_link->local_sink)
                        aconnector->fake_enable = false;

                if (aconnector->dc_sink)
                        dc_sink_release(aconnector->dc_sink);
                aconnector->dc_sink = NULL;
                amdgpu_dm_update_connector_after_detect(aconnector);
                mutex_unlock(&aconnector->hpd_lock);
        }
        drm_connector_list_iter_end(&iter);

        /* Force mode set in atomic commit */
        for_each_new_crtc_in_state(dm->cached_state, crtc, new_crtc_state, i)
                new_crtc_state->active_changed = true;

        /*
         * atomic_check is expected to create the dc states. We need to release
         * them here, since they were duplicated as part of the suspend
         * procedure.
         */
        for_each_new_crtc_in_state(dm->cached_state, crtc, new_crtc_state, i) {
                dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
                if (dm_new_crtc_state->stream) {
                        WARN_ON(kref_read(&dm_new_crtc_state->stream->refcount) > 1);
                        dc_stream_release(dm_new_crtc_state->stream);
                        dm_new_crtc_state->stream = NULL;
                }
        }

        for_each_new_plane_in_state(dm->cached_state, plane, new_plane_state, i) {
                dm_new_plane_state = to_dm_plane_state(new_plane_state);
                if (dm_new_plane_state->dc_state) {
                        WARN_ON(kref_read(&dm_new_plane_state->dc_state->refcount) > 1);
                        dc_plane_state_release(dm_new_plane_state->dc_state);
                        dm_new_plane_state->dc_state = NULL;
                }
        }

        drm_atomic_helper_resume(ddev, dm->cached_state);

        dm->cached_state = NULL;

        amdgpu_dm_irq_resume_late(adev);

        amdgpu_dm_smu_write_watermarks_table(adev);

        return 0;
}

/**
 * DOC: DM Lifecycle
 *
 * DM (and consequently DC) is registered in the amdgpu base driver as a IP
 * block. When CONFIG_DRM_AMD_DC is enabled, the DM device IP block is added to
 * the base driver's device list to be initialized and torn down accordingly.
 *
 * The functions to do so are provided as hooks in &struct amd_ip_funcs.
 */

static const struct amd_ip_funcs amdgpu_dm_funcs = {
        .name = "dm",
        .early_init = dm_early_init,
        .late_init = dm_late_init,
        .sw_init = dm_sw_init,
        .sw_fini = dm_sw_fini,
        .hw_init = dm_hw_init,
        .hw_fini = dm_hw_fini,
        .suspend = dm_suspend,
        .resume = dm_resume,
        .is_idle = dm_is_idle,
        .wait_for_idle = dm_wait_for_idle,
        .check_soft_reset = dm_check_soft_reset,
        .soft_reset = dm_soft_reset,
        .set_clockgating_state = dm_set_clockgating_state,
        .set_powergating_state = dm_set_powergating_state,
};

const struct amdgpu_ip_block_version dm_ip_block =
{
        .type = AMD_IP_BLOCK_TYPE_DCE,
        .major = 1,
        .minor = 0,
        .rev = 0,
        .funcs = &amdgpu_dm_funcs,
};


/**
 * DOC: atomic
 *

 * *WIP*
 */

static const struct drm_mode_config_funcs amdgpu_dm_mode_funcs = {
        .fb_create = amdgpu_display_user_framebuffer_create,
        .output_poll_changed = drm_fb_helper_output_poll_changed,
        .atomic_check = amdgpu_dm_atomic_check,
        .atomic_commit = amdgpu_dm_atomic_commit,
};

static struct drm_mode_config_helper_funcs amdgpu_dm_mode_config_helperfuncs = {
        .atomic_commit_tail = amdgpu_dm_atomic_commit_tail
};

static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
{
        u32 max_cll, min_cll, max, min, q, r;
        struct amdgpu_dm_backlight_caps *caps;
        struct amdgpu_display_manager *dm;
        struct drm_connector *conn_base;
        struct amdgpu_device *adev;
        struct dc_link *link = NULL;
        static const u8 pre_computed_values[] = {
                50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69,
                71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98};

        if (!aconnector || !aconnector->dc_link)
                return;

        link = aconnector->dc_link;
        if (link->connector_signal != SIGNAL_TYPE_EDP)
                return;

        conn_base = &aconnector->base;
        adev = conn_base->dev->dev_private;
        dm = &adev->dm;
        caps = &dm->backlight_caps;
        caps->ext_caps = &aconnector->dc_link->dpcd_sink_ext_caps;
        caps->aux_support = false;
        max_cll = conn_base->hdr_sink_metadata.hdmi_type1.max_cll;
        min_cll = conn_base->hdr_sink_metadata.hdmi_type1.min_cll;

        if (caps->ext_caps->bits.oled == 1 ||
            caps->ext_caps->bits.sdr_aux_backlight_control == 1 ||
            caps->ext_caps->bits.hdr_aux_backlight_control == 1)
                caps->aux_support = true;

        /* From the specification (CTA-861-G), for calculating the maximum
         * luminance we need to use:
         *      Luminance = 50*2**(CV/32)
         * Where CV is a one-byte value.
         * For calculating this expression we may need float point precision;
         * to avoid this complexity level, we take advantage that CV is divided
         * by a constant. From the Euclids division algorithm, we know that CV
         * can be written as: CV = 32*q + r. Next, we replace CV in the
         * Luminance expression and get 50*(2**q)*(2**(r/32)), hence we just
         * need to pre-compute the value of r/32. For pre-computing the values
         * We just used the following Ruby line:
         *      (0...32).each {|cv| puts (50*2**(cv/32.0)).round}
         * The results of the above expressions can be verified at
         * pre_computed_values.
         */
        q = max_cll >> 5;
        r = max_cll % 32;
        max = (1 << q) * pre_computed_values[r];

        // min luminance: maxLum * (CV/255)^2 / 100
        q = DIV_ROUND_CLOSEST(min_cll, 255);
        min = max * DIV_ROUND_CLOSEST((q * q), 100);

        caps->aux_max_input_signal = max;
        caps->aux_min_input_signal = min;
}

void amdgpu_dm_update_connector_after_detect(
                struct amdgpu_dm_connector *aconnector)
{
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct dc_sink *sink;

        /* MST handled by drm_mst framework */
        if (aconnector->mst_mgr.mst_state == true)
                return;


        sink = aconnector->dc_link->local_sink;
        if (sink)
                dc_sink_retain(sink);

        /*
         * Edid mgmt connector gets first update only in mode_valid hook and then
         * the connector sink is set to either fake or physical sink depends on link status.
         * Skip if already done during boot.
         */
        if (aconnector->base.force != DRM_FORCE_UNSPECIFIED
                        && aconnector->dc_em_sink) {

                /*
                 * For S3 resume with headless use eml_sink to fake stream
                 * because on resume connector->sink is set to NULL
                 */
                mutex_lock(&dev->mode_config.mutex);

                if (sink) {
                        if (aconnector->dc_sink) {
                                amdgpu_dm_update_freesync_caps(connector, NULL);
                                /*
                                 * retain and release below are used to
                                 * bump up refcount for sink because the link doesn't point
                                 * to it anymore after disconnect, so on next crtc to connector
                                 * reshuffle by UMD we will get into unwanted dc_sink release
                                 */
                                dc_sink_release(aconnector->dc_sink);
                        }
                        aconnector->dc_sink = sink;
                        dc_sink_retain(aconnector->dc_sink);
                        amdgpu_dm_update_freesync_caps(connector,
                                        aconnector->edid);
                } else {
                        amdgpu_dm_update_freesync_caps(connector, NULL);
                        if (!aconnector->dc_sink) {
                                aconnector->dc_sink = aconnector->dc_em_sink;
                                dc_sink_retain(aconnector->dc_sink);
                        }
                }

                mutex_unlock(&dev->mode_config.mutex);

                if (sink)
                        dc_sink_release(sink);
                return;
        }

        /*
         * TODO: temporary guard to look for proper fix
         * if this sink is MST sink, we should not do anything
         */
        if (sink && sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
                dc_sink_release(sink);
                return;
        }

        if (aconnector->dc_sink == sink) {
                /*
                 * We got a DP short pulse (Link Loss, DP CTS, etc...).
                 * Do nothing!!
                 */
                DRM_DEBUG_DRIVER("DCHPD: connector_id=%d: dc_sink didn't change.\n",
                                aconnector->connector_id);
                if (sink)
                        dc_sink_release(sink);
                return;
        }

        DRM_DEBUG_DRIVER("DCHPD: connector_id=%d: Old sink=%p New sink=%p\n",
                aconnector->connector_id, aconnector->dc_sink, sink);

        mutex_lock(&dev->mode_config.mutex);

        /*
         * 1. Update status of the drm connector
         * 2. Send an event and let userspace tell us what to do
         */
        if (sink) {
                /*
                 * TODO: check if we still need the S3 mode update workaround.
                 * If yes, put it here.
                 */
                if (aconnector->dc_sink)
                        amdgpu_dm_update_freesync_caps(connector, NULL);

                aconnector->dc_sink = sink;
                dc_sink_retain(aconnector->dc_sink);
                if (sink->dc_edid.length == 0) {
                        aconnector->edid = NULL;
                        if (aconnector->dc_link->aux_mode) {
                                drm_dp_cec_unset_edid(
                                        &aconnector->dm_dp_aux.aux);
                        }
                } else {
                        aconnector->edid =
                                (struct edid *)sink->dc_edid.raw_edid;

                        drm_connector_update_edid_property(connector,
                                                           aconnector->edid);

                        if (aconnector->dc_link->aux_mode)
                                drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
                                                    aconnector->edid);
                }

                amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
                update_connector_ext_caps(aconnector);
        } else {
                drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
                amdgpu_dm_update_freesync_caps(connector, NULL);
                drm_connector_update_edid_property(connector, NULL);
                aconnector->num_modes = 0;
                dc_sink_release(aconnector->dc_sink);
                aconnector->dc_sink = NULL;
                aconnector->edid = NULL;
#ifdef CONFIG_DRM_AMD_DC_HDCP
                /* Set CP to DESIRED if it was ENABLED, so we can re-enable it again on hotplug */
                if (connector->state->content_protection == DRM_MODE_CONTENT_PROTECTION_ENABLED)
                        connector->state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
#endif
        }

        mutex_unlock(&dev->mode_config.mutex);

        if (sink)
                dc_sink_release(sink);
}

static void handle_hpd_irq(void *param)
{
        struct amdgpu_dm_connector *aconnector = (struct amdgpu_dm_connector *)param;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        enum dc_connection_type new_connection_type = dc_connection_none;
#ifdef CONFIG_DRM_AMD_DC_HDCP
        struct amdgpu_device *adev = dev->dev_private;
#endif

        /*
         * In case of failure or MST no need to update connector status or notify the OS
         * since (for MST case) MST does this in its own context.
         */
        mutex_lock(&aconnector->hpd_lock);

#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (adev->dm.hdcp_workqueue)
                hdcp_reset_display(adev->dm.hdcp_workqueue, aconnector->dc_link->link_index);
#endif
        if (aconnector->fake_enable)
                aconnector->fake_enable = false;

        if (!dc_link_detect_sink(aconnector->dc_link, &new_connection_type))
                DRM_ERROR("KMS: Failed to detect connector\n");

        if (aconnector->base.force && new_connection_type == dc_connection_none) {
                emulated_link_detect(aconnector->dc_link);


                drm_modeset_lock_all(dev);
                dm_restore_drm_connector_state(dev, connector);
                drm_modeset_unlock_all(dev);

                if (aconnector->base.force == DRM_FORCE_UNSPECIFIED)
                        drm_kms_helper_hotplug_event(dev);

        } else if (dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD)) {
                amdgpu_dm_update_connector_after_detect(aconnector);


                drm_modeset_lock_all(dev);
                dm_restore_drm_connector_state(dev, connector);
                drm_modeset_unlock_all(dev);

                if (aconnector->base.force == DRM_FORCE_UNSPECIFIED)
                        drm_kms_helper_hotplug_event(dev);
        }
        mutex_unlock(&aconnector->hpd_lock);

}

static void dm_handle_hpd_rx_irq(struct amdgpu_dm_connector *aconnector)
{
        uint8_t esi[DP_PSR_ERROR_STATUS - DP_SINK_COUNT_ESI] = { 0 };
        uint8_t dret;
        bool new_irq_handled = false;
        int dpcd_addr;
        int dpcd_bytes_to_read;

        const int max_process_count = 30;
        int process_count = 0;

        const struct dc_link_status *link_status = dc_link_get_status(aconnector->dc_link);

        if (link_status->dpcd_caps->dpcd_rev.raw < 0x12) {
                dpcd_bytes_to_read = DP_LANE0_1_STATUS - DP_SINK_COUNT;
                /* DPCD 0x200 - 0x201 for downstream IRQ */
                dpcd_addr = DP_SINK_COUNT;
        } else {
                dpcd_bytes_to_read = DP_PSR_ERROR_STATUS - DP_SINK_COUNT_ESI;
                /* DPCD 0x2002 - 0x2005 for downstream IRQ */
                dpcd_addr = DP_SINK_COUNT_ESI;
        }

        dret = drm_dp_dpcd_read(
                &aconnector->dm_dp_aux.aux,
                dpcd_addr,
                esi,
                dpcd_bytes_to_read);

        while (dret == dpcd_bytes_to_read &&
                process_count < max_process_count) {
                uint8_t retry;
                dret = 0;

                process_count++;

                DRM_DEBUG_DRIVER("ESI %02x %02x %02x\n", esi[0], esi[1], esi[2]);
                /* handle HPD short pulse irq */
                if (aconnector->mst_mgr.mst_state)
                        drm_dp_mst_hpd_irq(
                                &aconnector->mst_mgr,
                                esi,
                                &new_irq_handled);

                if (new_irq_handled) {
                        /* ACK at DPCD to notify down stream */
                        const int ack_dpcd_bytes_to_write =
                                dpcd_bytes_to_read - 1;

                        for (retry = 0; retry < 3; retry++) {
                                uint8_t wret;

                                wret = drm_dp_dpcd_write(
                                        &aconnector->dm_dp_aux.aux,
                                        dpcd_addr + 1,
                                        &esi[1],
                                        ack_dpcd_bytes_to_write);
                                if (wret == ack_dpcd_bytes_to_write)
                                        break;
                        }

                        /* check if there is new irq to be handled */
                        dret = drm_dp_dpcd_read(
                                &aconnector->dm_dp_aux.aux,
                                dpcd_addr,
                                esi,
                                dpcd_bytes_to_read);

                        new_irq_handled = false;
                } else {
                        break;
                }
        }

        if (process_count == max_process_count)
                DRM_DEBUG_DRIVER("Loop exceeded max iterations\n");
}

static void handle_hpd_rx_irq(void *param)
{
        struct amdgpu_dm_connector *aconnector = (struct amdgpu_dm_connector *)param;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct dc_link *dc_link = aconnector->dc_link;
        bool is_mst_root_connector = aconnector->mst_mgr.mst_state;
        enum dc_connection_type new_connection_type = dc_connection_none;
#ifdef CONFIG_DRM_AMD_DC_HDCP
        union hpd_irq_data hpd_irq_data;
        struct amdgpu_device *adev = dev->dev_private;

        memset(&hpd_irq_data, 0, sizeof(hpd_irq_data));
#endif

        /*
         * TODO:Temporary add mutex to protect hpd interrupt not have a gpio
         * conflict, after implement i2c helper, this mutex should be
         * retired.
         */
        if (dc_link->type != dc_connection_mst_branch)
                mutex_lock(&aconnector->hpd_lock);


#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL) &&
#else
        if (dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL) &&
#endif
                        !is_mst_root_connector) {
                /* Downstream Port status changed. */
                if (!dc_link_detect_sink(dc_link, &new_connection_type))
                        DRM_ERROR("KMS: Failed to detect connector\n");

                if (aconnector->base.force && new_connection_type == dc_connection_none) {
                        emulated_link_detect(dc_link);

                        if (aconnector->fake_enable)
                                aconnector->fake_enable = false;

                        amdgpu_dm_update_connector_after_detect(aconnector);


                        drm_modeset_lock_all(dev);
                        dm_restore_drm_connector_state(dev, connector);
                        drm_modeset_unlock_all(dev);

                        drm_kms_helper_hotplug_event(dev);
                } else if (dc_link_detect(dc_link, DETECT_REASON_HPDRX)) {

                        if (aconnector->fake_enable)
                                aconnector->fake_enable = false;

                        amdgpu_dm_update_connector_after_detect(aconnector);


                        drm_modeset_lock_all(dev);
                        dm_restore_drm_connector_state(dev, connector);
                        drm_modeset_unlock_all(dev);

                        drm_kms_helper_hotplug_event(dev);
                }
        }
#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (hpd_irq_data.bytes.device_service_irq.bits.CP_IRQ) {
                if (adev->dm.hdcp_workqueue)
                        hdcp_handle_cpirq(adev->dm.hdcp_workqueue,  aconnector->base.index);
        }
#endif
        if ((dc_link->cur_link_settings.lane_count != LANE_COUNT_UNKNOWN) ||
            (dc_link->type == dc_connection_mst_branch))
                dm_handle_hpd_rx_irq(aconnector);

        if (dc_link->type != dc_connection_mst_branch) {
                drm_dp_cec_irq(&aconnector->dm_dp_aux.aux);
                mutex_unlock(&aconnector->hpd_lock);
        }
}

static void register_hpd_handlers(struct amdgpu_device *adev)
{
        struct drm_device *dev = adev->ddev;
        struct drm_connector *connector;
        struct amdgpu_dm_connector *aconnector;
        const struct dc_link *dc_link;
        struct dc_interrupt_params int_params = {0};

        int_params.requested_polarity = INTERRUPT_POLARITY_DEFAULT;
        int_params.current_polarity = INTERRUPT_POLARITY_DEFAULT;

        list_for_each_entry(connector,
                        &dev->mode_config.connector_list, head) {

                aconnector = to_amdgpu_dm_connector(connector);
                dc_link = aconnector->dc_link;

                if (DC_IRQ_SOURCE_INVALID != dc_link->irq_source_hpd) {
                        int_params.int_context = INTERRUPT_LOW_IRQ_CONTEXT;
                        int_params.irq_source = dc_link->irq_source_hpd;

                        amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                        handle_hpd_irq,
                                        (void *) aconnector);
                }

                if (DC_IRQ_SOURCE_INVALID != dc_link->irq_source_hpd_rx) {

                        /* Also register for DP short pulse (hpd_rx). */
                        int_params.int_context = INTERRUPT_LOW_IRQ_CONTEXT;
                        int_params.irq_source = dc_link->irq_source_hpd_rx;

                        amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                        handle_hpd_rx_irq,
                                        (void *) aconnector);
                }
        }
}

/* Register IRQ sources and initialize IRQ callbacks */
static int dce110_register_irq_handlers(struct amdgpu_device *adev)
{
        struct dc *dc = adev->dm.dc;
        struct common_irq_params *c_irq_params;
        struct dc_interrupt_params int_params = {0};
        int r;
        int i;
        unsigned client_id = AMDGPU_IRQ_CLIENTID_LEGACY;

        if (adev->asic_type >= CHIP_VEGA10)
                client_id = SOC15_IH_CLIENTID_DCE;

        int_params.requested_polarity = INTERRUPT_POLARITY_DEFAULT;
        int_params.current_polarity = INTERRUPT_POLARITY_DEFAULT;

        /*
         * Actions of amdgpu_irq_add_id():
         * 1. Register a set() function with base driver.
         *    Base driver will call set() function to enable/disable an
         *    interrupt in DC hardware.
         * 2. Register amdgpu_dm_irq_handler().
         *    Base driver will call amdgpu_dm_irq_handler() for ALL interrupts
         *    coming from DC hardware.
         *    amdgpu_dm_irq_handler() will re-direct the interrupt to DC
         *    for acknowledging and handling. */

        /* Use VBLANK interrupt */
        for (i = VISLANDS30_IV_SRCID_D1_VERTICAL_INTERRUPT0; i <= VISLANDS30_IV_SRCID_D6_VERTICAL_INTERRUPT0; i++) {
                r = amdgpu_irq_add_id(adev, client_id, i, &adev->crtc_irq);
                if (r) {
                        DRM_ERROR("Failed to add crtc irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.vblank_params[int_params.irq_source - DC_IRQ_SOURCE_VBLANK1];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                dm_crtc_high_irq, c_irq_params);
        }

        /* Use VUPDATE interrupt */
        for (i = VISLANDS30_IV_SRCID_D1_V_UPDATE_INT; i <= VISLANDS30_IV_SRCID_D6_V_UPDATE_INT; i += 2) {
                r = amdgpu_irq_add_id(adev, client_id, i, &adev->vupdate_irq);
                if (r) {
                        DRM_ERROR("Failed to add vupdate irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.vupdate_params[int_params.irq_source - DC_IRQ_SOURCE_VUPDATE1];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                dm_vupdate_high_irq, c_irq_params);
        }

        /* Use GRPH_PFLIP interrupt */
        for (i = VISLANDS30_IV_SRCID_D1_GRPH_PFLIP;
                        i <= VISLANDS30_IV_SRCID_D6_GRPH_PFLIP; i += 2) {
                r = amdgpu_irq_add_id(adev, client_id, i, &adev->pageflip_irq);
                if (r) {
                        DRM_ERROR("Failed to add page flip irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.pflip_params[int_params.irq_source - DC_IRQ_SOURCE_PFLIP_FIRST];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                dm_pflip_high_irq, c_irq_params);

        }

        /* HPD */
        r = amdgpu_irq_add_id(adev, client_id,
                        VISLANDS30_IV_SRCID_HOTPLUG_DETECT_A, &adev->hpd_irq);
        if (r) {
                DRM_ERROR("Failed to add hpd irq id!\n");
                return r;
        }

        register_hpd_handlers(adev);

        return 0;
}

#if defined(CONFIG_DRM_AMD_DC_DCN)
/* Register IRQ sources and initialize IRQ callbacks */
static int dcn10_register_irq_handlers(struct amdgpu_device *adev)
{
        struct dc *dc = adev->dm.dc;
        struct common_irq_params *c_irq_params;
        struct dc_interrupt_params int_params = {0};
        int r;
        int i;

        int_params.requested_polarity = INTERRUPT_POLARITY_DEFAULT;
        int_params.current_polarity = INTERRUPT_POLARITY_DEFAULT;

        /*
         * Actions of amdgpu_irq_add_id():
         * 1. Register a set() function with base driver.
         *    Base driver will call set() function to enable/disable an
         *    interrupt in DC hardware.
         * 2. Register amdgpu_dm_irq_handler().
         *    Base driver will call amdgpu_dm_irq_handler() for ALL interrupts
         *    coming from DC hardware.
         *    amdgpu_dm_irq_handler() will re-direct the interrupt to DC
         *    for acknowledging and handling.
         */

        /* Use VSTARTUP interrupt */
        for (i = DCN_1_0__SRCID__DC_D1_OTG_VSTARTUP;
                        i <= DCN_1_0__SRCID__DC_D1_OTG_VSTARTUP + adev->mode_info.num_crtc - 1;
                        i++) {
                r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_DCE, i, &adev->crtc_irq);

                if (r) {
                        DRM_ERROR("Failed to add crtc irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.vblank_params[int_params.irq_source - DC_IRQ_SOURCE_VBLANK1];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(
                        adev, &int_params, dm_crtc_high_irq, c_irq_params);
        }

        /* Use VUPDATE_NO_LOCK interrupt on DCN, which seems to correspond to
         * the regular VUPDATE interrupt on DCE. We want DC_IRQ_SOURCE_VUPDATEx
         * to trigger at end of each vblank, regardless of state of the lock,
         * matching DCE behaviour.
         */
        for (i = DCN_1_0__SRCID__OTG0_IHC_V_UPDATE_NO_LOCK_INTERRUPT;
             i <= DCN_1_0__SRCID__OTG0_IHC_V_UPDATE_NO_LOCK_INTERRUPT + adev->mode_info.num_crtc - 1;
             i++) {
                r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_DCE, i, &adev->vupdate_irq);

                if (r) {
                        DRM_ERROR("Failed to add vupdate irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.vupdate_params[int_params.irq_source - DC_IRQ_SOURCE_VUPDATE1];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                dm_vupdate_high_irq, c_irq_params);
        }

        /* Use GRPH_PFLIP interrupt */
        for (i = DCN_1_0__SRCID__HUBP0_FLIP_INTERRUPT;
                        i <= DCN_1_0__SRCID__HUBP0_FLIP_INTERRUPT + adev->mode_info.num_crtc - 1;
                        i++) {
                r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_DCE, i, &adev->pageflip_irq);
                if (r) {
                        DRM_ERROR("Failed to add page flip irq id!\n");
                        return r;
                }

                int_params.int_context = INTERRUPT_HIGH_IRQ_CONTEXT;
                int_params.irq_source =
                        dc_interrupt_to_irq_source(dc, i, 0);

                c_irq_params = &adev->dm.pflip_params[int_params.irq_source - DC_IRQ_SOURCE_PFLIP_FIRST];

                c_irq_params->adev = adev;
                c_irq_params->irq_src = int_params.irq_source;

                amdgpu_dm_irq_register_interrupt(adev, &int_params,
                                dm_pflip_high_irq, c_irq_params);

        }

        /* HPD */
        r = amdgpu_irq_add_id(adev, SOC15_IH_CLIENTID_DCE, DCN_1_0__SRCID__DC_HPD1_INT,
                        &adev->hpd_irq);
        if (r) {
                DRM_ERROR("Failed to add hpd irq id!\n");
                return r;
        }

        register_hpd_handlers(adev);

        return 0;
}
#endif

/*
 * Acquires the lock for the atomic state object and returns
 * the new atomic state.
 *
 * This should only be called during atomic check.
 */
static int dm_atomic_get_state(struct drm_atomic_state *state,
                               struct dm_atomic_state **dm_state)
{
        struct drm_device *dev = state->dev;
        struct amdgpu_device *adev = dev->dev_private;
        struct amdgpu_display_manager *dm = &adev->dm;
        struct drm_private_state *priv_state;

        if (*dm_state)
                return 0;

        priv_state = drm_atomic_get_private_obj_state(state, &dm->atomic_obj);
        if (IS_ERR(priv_state))
                return PTR_ERR(priv_state);

        *dm_state = to_dm_atomic_state(priv_state);

        return 0;
}

struct dm_atomic_state *
dm_atomic_get_new_state(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct amdgpu_device *adev = dev->dev_private;
        struct amdgpu_display_manager *dm = &adev->dm;
        struct drm_private_obj *obj;
        struct drm_private_state *new_obj_state;
        int i;

        for_each_new_private_obj_in_state(state, obj, new_obj_state, i) {
                if (obj->funcs == dm->atomic_obj.funcs)
                        return to_dm_atomic_state(new_obj_state);
        }

        return NULL;
}

struct dm_atomic_state *
dm_atomic_get_old_state(struct drm_atomic_state *state)
{
        struct drm_device *dev = state->dev;
        struct amdgpu_device *adev = dev->dev_private;
        struct amdgpu_display_manager *dm = &adev->dm;
        struct drm_private_obj *obj;
        struct drm_private_state *old_obj_state;
        int i;

        for_each_old_private_obj_in_state(state, obj, old_obj_state, i) {
                if (obj->funcs == dm->atomic_obj.funcs)
                        return to_dm_atomic_state(old_obj_state);
        }

        return NULL;
}

static struct drm_private_state *
dm_atomic_duplicate_state(struct drm_private_obj *obj)
{
        struct dm_atomic_state *old_state, *new_state;

        new_state = kzalloc(sizeof(*new_state), GFP_KERNEL);
        if (!new_state)
                return NULL;

        __drm_atomic_helper_private_obj_duplicate_state(obj, &new_state->base);

        old_state = to_dm_atomic_state(obj->state);

        if (old_state && old_state->context)
                new_state->context = dc_copy_state(old_state->context);

        if (!new_state->context) {
                kfree(new_state);
                return NULL;
        }

        return &new_state->base;
}

static void dm_atomic_destroy_state(struct drm_private_obj *obj,
                                    struct drm_private_state *state)
{
        struct dm_atomic_state *dm_state = to_dm_atomic_state(state);

        if (dm_state && dm_state->context)
                dc_release_state(dm_state->context);

        kfree(dm_state);
}

static struct drm_private_state_funcs dm_atomic_state_funcs = {
        .atomic_duplicate_state = dm_atomic_duplicate_state,
        .atomic_destroy_state = dm_atomic_destroy_state,
};

static int amdgpu_dm_mode_config_init(struct amdgpu_device *adev)
{
        struct dm_atomic_state *state;
        int r;

        adev->mode_info.mode_config_initialized = true;

        adev->ddev->mode_config.funcs = (void *)&amdgpu_dm_mode_funcs;
        adev->ddev->mode_config.helper_private = &amdgpu_dm_mode_config_helperfuncs;

        adev->ddev->mode_config.max_width = 16384;
        adev->ddev->mode_config.max_height = 16384;

        adev->ddev->mode_config.preferred_depth = 24;
        adev->ddev->mode_config.prefer_shadow = 1;
        /* indicates support for immediate flip */
        adev->ddev->mode_config.async_page_flip = true;

        adev->ddev->mode_config.fb_base = adev->gmc.aper_base;

        state = kzalloc(sizeof(*state), GFP_KERNEL);
        if (!state)
                return -ENOMEM;

        state->context = dc_create_state(adev->dm.dc);
        if (!state->context) {
                kfree(state);
                return -ENOMEM;
        }

        dc_resource_state_copy_construct_current(adev->dm.dc, state->context);

        drm_atomic_private_obj_init(adev->ddev,
                                    &adev->dm.atomic_obj,
                                    &state->base,
                                    &dm_atomic_state_funcs);

        r = amdgpu_display_modeset_create_props(adev);
        if (r)
                return r;

        r = amdgpu_dm_audio_init(adev);
        if (r)
                return r;

        return 0;
}

#define AMDGPU_DM_DEFAULT_MIN_BACKLIGHT 12
#define AMDGPU_DM_DEFAULT_MAX_BACKLIGHT 255
#define AUX_BL_DEFAULT_TRANSITION_TIME_MS 50

#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) ||\
        defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE)

static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm)
{
#if defined(CONFIG_ACPI)
        struct amdgpu_dm_backlight_caps caps;

        if (dm->backlight_caps.caps_valid)
                return;

        amdgpu_acpi_get_backlight_caps(dm->adev, &caps);
        if (caps.caps_valid) {
                dm->backlight_caps.caps_valid = true;
                if (caps.aux_support)
                        return;
                dm->backlight_caps.min_input_signal = caps.min_input_signal;
                dm->backlight_caps.max_input_signal = caps.max_input_signal;
        } else {
                dm->backlight_caps.min_input_signal =
                                AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
                dm->backlight_caps.max_input_signal =
                                AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
        }
#else
        if (dm->backlight_caps.aux_support)
                return;

        dm->backlight_caps.min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT;
        dm->backlight_caps.max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT;
#endif
}

static int set_backlight_via_aux(struct dc_link *link, uint32_t brightness)
{
        bool rc;

        if (!link)
                return 1;

        rc = dc_link_set_backlight_level_nits(link, true, brightness,
                                              AUX_BL_DEFAULT_TRANSITION_TIME_MS);

        return rc ? 0 : 1;
}

static u32 convert_brightness(const struct amdgpu_dm_backlight_caps *caps,
                              const uint32_t user_brightness)
{
        u32 min, max, conversion_pace;
        u32 brightness = user_brightness;

        if (!caps)
                goto out;

        if (!caps->aux_support) {
                max = caps->max_input_signal;
                min = caps->min_input_signal;
                /*
                 * The brightness input is in the range 0-255
                 * It needs to be rescaled to be between the
                 * requested min and max input signal
                 * It also needs to be scaled up by 0x101 to
                 * match the DC interface which has a range of
                 * 0 to 0xffff
                 */
                conversion_pace = 0x101;
                brightness =
                        user_brightness
                        * conversion_pace
                        * (max - min)
                        / AMDGPU_MAX_BL_LEVEL
                        + min * conversion_pace;
        } else {
                /* TODO
                 * We are doing a linear interpolation here, which is OK but
                 * does not provide the optimal result. We probably want
                 * something close to the Perceptual Quantizer (PQ) curve.
                 */
                max = caps->aux_max_input_signal;
                min = caps->aux_min_input_signal;

                brightness = (AMDGPU_MAX_BL_LEVEL - user_brightness) * min
                               + user_brightness * max;
                // Multiple the value by 1000 since we use millinits
                brightness *= 1000;
                brightness = DIV_ROUND_CLOSEST(brightness, AMDGPU_MAX_BL_LEVEL);
        }

out:
        return brightness;
}

static int amdgpu_dm_backlight_update_status(struct backlight_device *bd)
{
        struct amdgpu_display_manager *dm = bl_get_data(bd);
        struct amdgpu_dm_backlight_caps caps;
        struct dc_link *link = NULL;
        u32 brightness;
        bool rc;

        amdgpu_dm_update_backlight_caps(dm);
        caps = dm->backlight_caps;

        link = (struct dc_link *)dm->backlight_link;

        brightness = convert_brightness(&caps, bd->props.brightness);
        // Change brightness based on AUX property
        if (caps.aux_support)
                return set_backlight_via_aux(link, brightness);

        rc = dc_link_set_backlight_level(dm->backlight_link, brightness, 0);

        return rc ? 0 : 1;
}

static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd)
{
        struct amdgpu_display_manager *dm = bl_get_data(bd);
        int ret = dc_link_get_backlight_level(dm->backlight_link);

        if (ret == DC_ERROR_UNEXPECTED)
                return bd->props.brightness;
        return ret;
}

static const struct backlight_ops amdgpu_dm_backlight_ops = {
        .options = BL_CORE_SUSPENDRESUME,
        .get_brightness = amdgpu_dm_backlight_get_brightness,
        .update_status  = amdgpu_dm_backlight_update_status,
};

static void
amdgpu_dm_register_backlight_device(struct amdgpu_display_manager *dm)
{
        char bl_name[16];
        struct backlight_properties props = { 0 };

        amdgpu_dm_update_backlight_caps(dm);

        props.max_brightness = AMDGPU_MAX_BL_LEVEL;
        props.brightness = AMDGPU_MAX_BL_LEVEL;
        props.type = BACKLIGHT_RAW;

        snprintf(bl_name, sizeof(bl_name), "amdgpu_bl%d",
                        dm->adev->ddev->primary->index);

        dm->backlight_dev = backlight_device_register(bl_name,
                        dm->adev->ddev->dev,
                        dm,
                        &amdgpu_dm_backlight_ops,
                        &props);

        if (IS_ERR(dm->backlight_dev))
                DRM_ERROR("DM: Backlight registration failed!\n");
        else
                DRM_DEBUG_DRIVER("DM: Registered Backlight device: %s\n", bl_name);
}

#endif

static int initialize_plane(struct amdgpu_display_manager *dm,
                            struct amdgpu_mode_info *mode_info, int plane_id,