/*
 * Copyright (C) 2008 Maarten Maathuis.
 * All Rights Reserved.
 *
 * 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 (including the
 * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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.
 *
 */

#include <acpi/button.h>

#include <linux/pm_runtime.h>
#include <linux/vga_switcheroo.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_atomic.h>

#include "nouveau_reg.h"
#include "nouveau_drv.h"
#include "dispnv04/hw.h"
#include "dispnv50/disp.h"
#include "nouveau_acpi.h"

#include "nouveau_display.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
#include "nouveau_crtc.h"

#include <nvif/class.h>
#include <nvif/if0011.h>

struct drm_display_mode *
nouveau_conn_native_mode(struct drm_connector *connector)
{
        const struct drm_connector_helper_funcs *helper = connector->helper_private;
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct drm_device *dev = connector->dev;
        struct drm_display_mode *mode, *largest = NULL;
        int high_w = 0, high_h = 0, high_v = 0;

        list_for_each_entry(mode, &connector->probed_modes, head) {
                if (helper->mode_valid(connector, mode) != MODE_OK ||
                    (mode->flags & DRM_MODE_FLAG_INTERLACE))
                        continue;

                /* Use preferred mode if there is one.. */
                if (mode->type & DRM_MODE_TYPE_PREFERRED) {
                        NV_DEBUG(drm, "native mode from preferred\n");
                        return drm_mode_duplicate(dev, mode);
                }

                /* Otherwise, take the resolution with the largest width, then
                 * height, then vertical refresh
                 */
                if (mode->hdisplay < high_w)
                        continue;

                if (mode->hdisplay == high_w && mode->vdisplay < high_h)
                        continue;

                if (mode->hdisplay == high_w && mode->vdisplay == high_h &&
                    drm_mode_vrefresh(mode) < high_v)
                        continue;

                high_w = mode->hdisplay;
                high_h = mode->vdisplay;
                high_v = drm_mode_vrefresh(mode);
                largest = mode;
        }

        NV_DEBUG(drm, "native mode from largest: %dx%d@%d\n",
                      high_w, high_h, high_v);
        return largest ? drm_mode_duplicate(dev, largest) : NULL;
}

int
nouveau_conn_atomic_get_property(struct drm_connector *connector,
                                 const struct drm_connector_state *state,
                                 struct drm_property *property, u64 *val)
{
        struct nouveau_conn_atom *asyc = nouveau_conn_atom(state);
        struct nouveau_display *disp = nouveau_display(connector->dev);
        struct drm_device *dev = connector->dev;

        if (property == dev->mode_config.scaling_mode_property)
                *val = asyc->scaler.mode;
        else if (property == disp->underscan_property)
                *val = asyc->scaler.underscan.mode;
        else if (property == disp->underscan_hborder_property)
                *val = asyc->scaler.underscan.hborder;
        else if (property == disp->underscan_vborder_property)
                *val = asyc->scaler.underscan.vborder;
        else if (property == disp->dithering_mode)
                *val = asyc->dither.mode;
        else if (property == disp->dithering_depth)
                *val = asyc->dither.depth;
        else if (property == disp->vibrant_hue_property)
                *val = asyc->procamp.vibrant_hue;
        else if (property == disp->color_vibrance_property)
                *val = asyc->procamp.color_vibrance;
        else
                return -EINVAL;

        return 0;
}

int
nouveau_conn_atomic_set_property(struct drm_connector *connector,
                                 struct drm_connector_state *state,
                                 struct drm_property *property, u64 val)
{
        struct drm_device *dev = connector->dev;
        struct nouveau_conn_atom *asyc = nouveau_conn_atom(state);
        struct nouveau_display *disp = nouveau_display(dev);

        if (property == dev->mode_config.scaling_mode_property) {
                switch (val) {
                case DRM_MODE_SCALE_NONE:
                        /* We allow 'None' for EDID modes, even on a fixed
                         * panel (some exist with support for lower refresh
                         * rates, which people might want to use for power-
                         * saving purposes).
                         *
                         * Non-EDID modes will force the use of GPU scaling
                         * to the native mode regardless of this setting.
                         */
                        switch (connector->connector_type) {
                        case DRM_MODE_CONNECTOR_LVDS:
                        case DRM_MODE_CONNECTOR_eDP:
                                /* ... except prior to G80, where the code
                                 * doesn't support such things.
                                 */
                                if (disp->disp.object.oclass < NV50_DISP)
                                        return -EINVAL;
                                break;
                        default:
                                break;
                        }
                        break;
                case DRM_MODE_SCALE_FULLSCREEN:
                case DRM_MODE_SCALE_CENTER:
                case DRM_MODE_SCALE_ASPECT:
                        break;
                default:
                        return -EINVAL;
                }

                if (asyc->scaler.mode != val) {
                        asyc->scaler.mode = val;
                        asyc->set.scaler = true;
                }
        } else
        if (property == disp->underscan_property) {
                if (asyc->scaler.underscan.mode != val) {
                        asyc->scaler.underscan.mode = val;
                        asyc->set.scaler = true;
                }
        } else
        if (property == disp->underscan_hborder_property) {
                if (asyc->scaler.underscan.hborder != val) {
                        asyc->scaler.underscan.hborder = val;
                        asyc->set.scaler = true;
                }
        } else
        if (property == disp->underscan_vborder_property) {
                if (asyc->scaler.underscan.vborder != val) {
                        asyc->scaler.underscan.vborder = val;
                        asyc->set.scaler = true;
                }
        } else
        if (property == disp->dithering_mode) {
                if (asyc->dither.mode != val) {
                        asyc->dither.mode = val;
                        asyc->set.dither = true;
                }
        } else
        if (property == disp->dithering_depth) {
                if (asyc->dither.mode != val) {
                        asyc->dither.depth = val;
                        asyc->set.dither = true;
                }
        } else
        if (property == disp->vibrant_hue_property) {
                if (asyc->procamp.vibrant_hue != val) {
                        asyc->procamp.vibrant_hue = val;
                        asyc->set.procamp = true;
                }
        } else
        if (property == disp->color_vibrance_property) {
                if (asyc->procamp.color_vibrance != val) {
                        asyc->procamp.color_vibrance = val;
                        asyc->set.procamp = true;
                }
        } else {
                return -EINVAL;
        }

        return 0;
}

void
nouveau_conn_atomic_destroy_state(struct drm_connector *connector,
                                  struct drm_connector_state *state)
{
        struct nouveau_conn_atom *asyc = nouveau_conn_atom(state);
        __drm_atomic_helper_connector_destroy_state(&asyc->state);
        kfree(asyc);
}

struct drm_connector_state *
nouveau_conn_atomic_duplicate_state(struct drm_connector *connector)
{
        struct nouveau_conn_atom *armc = nouveau_conn_atom(connector->state);
        struct nouveau_conn_atom *asyc;
        if (!(asyc = kmalloc_obj(*asyc)))
                return NULL;
        __drm_atomic_helper_connector_duplicate_state(connector, &asyc->state);
        asyc->dither = armc->dither;
        asyc->scaler = armc->scaler;
        asyc->procamp = armc->procamp;
        asyc->set.mask = 0;
        return &asyc->state;
}

void
nouveau_conn_reset(struct drm_connector *connector)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_conn_atom *asyc;

        if (drm_drv_uses_atomic_modeset(connector->dev)) {
                if (WARN_ON(!(asyc = kzalloc_obj(*asyc))))
                        return;

                if (connector->state)
                        nouveau_conn_atomic_destroy_state(connector,
                                                          connector->state);

                __drm_atomic_helper_connector_reset(connector, &asyc->state);
        } else {
                asyc = &nv_connector->properties_state;
        }

        asyc->dither.mode = DITHERING_MODE_AUTO;
        asyc->dither.depth = DITHERING_DEPTH_AUTO;
        asyc->scaler.mode = DRM_MODE_SCALE_NONE;
        asyc->scaler.underscan.mode = UNDERSCAN_OFF;
        asyc->procamp.color_vibrance = 150;
        asyc->procamp.vibrant_hue = 90;

        if (nouveau_display(connector->dev)->disp.object.oclass < NV50_DISP) {
                switch (connector->connector_type) {
                case DRM_MODE_CONNECTOR_LVDS:
                        /* See note in nouveau_conn_atomic_set_property(). */
                        asyc->scaler.mode = DRM_MODE_SCALE_FULLSCREEN;
                        break;
                default:
                        break;
                }
        }
}

void
nouveau_conn_attach_properties(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct nouveau_display *disp = nouveau_display(dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_conn_atom *armc;

        if (drm_drv_uses_atomic_modeset(connector->dev))
                armc = nouveau_conn_atom(connector->state);
        else
                armc = &nv_connector->properties_state;

        /* Init DVI-I specific properties. */
        if (connector->connector_type == DRM_MODE_CONNECTOR_DVII)
                drm_object_attach_property(&connector->base, dev->mode_config.
                                           dvi_i_subconnector_property, 0);

        /* Add overscan compensation options to digital outputs. */
        if (disp->underscan_property &&
            (connector->connector_type == DRM_MODE_CONNECTOR_DVID ||
             connector->connector_type == DRM_MODE_CONNECTOR_DVII ||
             connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
             connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort)) {
                drm_object_attach_property(&connector->base,
                                           disp->underscan_property,
                                           UNDERSCAN_OFF);
                drm_object_attach_property(&connector->base,
                                           disp->underscan_hborder_property, 0);
                drm_object_attach_property(&connector->base,
                                           disp->underscan_vborder_property, 0);
        }

        /* Add hue and saturation options. */
        if (disp->vibrant_hue_property)
                drm_object_attach_property(&connector->base,
                                           disp->vibrant_hue_property,
                                           armc->procamp.vibrant_hue);
        if (disp->color_vibrance_property)
                drm_object_attach_property(&connector->base,
                                           disp->color_vibrance_property,
                                           armc->procamp.color_vibrance);

        /* Scaling mode property. */
        switch (connector->connector_type) {
        case DRM_MODE_CONNECTOR_TV:
                break;
        case DRM_MODE_CONNECTOR_VGA:
                if (disp->disp.object.oclass < NV50_DISP)
                        break; /* Can only scale on DFPs. */
                fallthrough;
        default:
                drm_object_attach_property(&connector->base, dev->mode_config.
                                           scaling_mode_property,
                                           armc->scaler.mode);
                break;
        }

        /* Dithering properties. */
        switch (connector->connector_type) {
        case DRM_MODE_CONNECTOR_TV:
        case DRM_MODE_CONNECTOR_VGA:
                break;
        default:
                if (disp->dithering_mode) {
                        drm_object_attach_property(&connector->base,
                                                   disp->dithering_mode,
                                                   armc->dither.mode);
                }
                if (disp->dithering_depth) {
                        drm_object_attach_property(&connector->base,
                                                   disp->dithering_depth,
                                                   armc->dither.depth);
                }
                break;
        }
}

MODULE_PARM_DESC(tv_disable, "Disable TV-out detection");
int nouveau_tv_disable = 0;
module_param_named(tv_disable, nouveau_tv_disable, int, 0400);

MODULE_PARM_DESC(ignorelid, "Ignore ACPI lid status");
int nouveau_ignorelid = 0;
module_param_named(ignorelid, nouveau_ignorelid, int, 0400);

MODULE_PARM_DESC(duallink, "Allow dual-link TMDS (default: enabled)");
int nouveau_duallink = 1;
module_param_named(duallink, nouveau_duallink, int, 0400);

MODULE_PARM_DESC(hdmimhz, "Force a maximum HDMI pixel clock (in MHz)");
int nouveau_hdmimhz = 0;
module_param_named(hdmimhz, nouveau_hdmimhz, int, 0400);

struct nouveau_encoder *
find_encoder(struct drm_connector *connector, int type)
{
        struct nouveau_encoder *nv_encoder;
        struct drm_encoder *enc;

        drm_connector_for_each_possible_encoder(connector, enc) {
                nv_encoder = nouveau_encoder(enc);

                if (type == DCB_OUTPUT_ANY ||
                    (nv_encoder->dcb && nv_encoder->dcb->type == type))
                        return nv_encoder;
        }

        return NULL;
}

static void
nouveau_connector_destroy(struct drm_connector *connector)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        nvif_event_dtor(&nv_connector->irq);
        nvif_event_dtor(&nv_connector->hpd);
        kfree(nv_connector->edid);
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        if (nv_connector->aux.transfer)
                drm_dp_cec_unregister_connector(&nv_connector->aux);
        nvif_conn_dtor(&nv_connector->conn);
        kfree(connector);
}

static struct nouveau_encoder *
nouveau_connector_ddc_detect(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct pci_dev *pdev = to_pci_dev(dev->dev);
        struct nouveau_connector *conn = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = NULL, *found = NULL;
        struct drm_encoder *encoder;
        int ret;
        bool switcheroo_ddc = false;

        drm_connector_for_each_possible_encoder(connector, encoder) {
                nv_encoder = nouveau_encoder(encoder);

                if (nvif_object_constructed(&nv_encoder->outp.object)) {
                        enum nvif_outp_detect_status status;

                        if (nv_encoder->dcb->type == DCB_OUTPUT_DP) {
                                ret = nouveau_dp_detect(conn, nv_encoder);
                                if (ret == NOUVEAU_DP_MST)
                                        return NULL;
                                if (ret != NOUVEAU_DP_SST)
                                        continue;

                                return nv_encoder;
                        } else {
                                status = nvif_outp_detect(&nv_encoder->outp);
                                switch (status) {
                                case PRESENT:
                                        return nv_encoder;
                                case NOT_PRESENT:
                                        continue;
                                case UNKNOWN:
                                        break;
                                default:
                                        WARN_ON(1);
                                        break;
                                }
                        }
                }

                if (!nv_encoder->i2c)
                        continue;

                if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS) {
                        switcheroo_ddc = !!(vga_switcheroo_handler_flags() &
                                            VGA_SWITCHEROO_CAN_SWITCH_DDC);
                }

                if (switcheroo_ddc)
                        vga_switcheroo_lock_ddc(pdev);
                if (nvkm_probe_i2c(nv_encoder->i2c, 0x50))
                        found = nv_encoder;
                if (switcheroo_ddc)
                        vga_switcheroo_unlock_ddc(pdev);

                if (found)
                        break;
        }

        return found;
}

static struct nouveau_encoder *
nouveau_connector_of_detect(struct drm_connector *connector)
{
#ifdef __powerpc__
        struct drm_device *dev = connector->dev;
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder;
        struct pci_dev *pdev = to_pci_dev(dev->dev);
        struct device_node *dn = pci_device_to_OF_node(pdev);

        if (!dn ||
            !((nv_encoder = find_encoder(connector, DCB_OUTPUT_TMDS)) ||
              (nv_encoder = find_encoder(connector, DCB_OUTPUT_ANALOG))))
                return NULL;

        for_each_child_of_node_scoped(dn, cn) {
                const char *name = of_get_property(cn, "name", NULL);
                const void *edid = of_get_property(cn, "EDID", NULL);
                int idx = name ? name[strlen(name) - 1] - 'A' : 0;

                if (nv_encoder->dcb->i2c_index == idx && edid) {
                        nv_connector->edid =
                                kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
                        return nv_encoder;
                }
        }
#endif
        return NULL;
}

static void
nouveau_connector_set_encoder(struct drm_connector *connector,
                              struct nouveau_encoder *nv_encoder)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct drm_device *dev = connector->dev;
        struct pci_dev *pdev = to_pci_dev(dev->dev);

        if (nv_connector->detected_encoder == nv_encoder)
                return;
        nv_connector->detected_encoder = nv_encoder;

        if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
                if (nv_encoder->dcb->type == DCB_OUTPUT_DP)
                        connector->interlace_allowed =
                                nv_encoder->caps.dp_interlace;
                else
                        connector->interlace_allowed =
                                drm->client.device.info.family < NV_DEVICE_INFO_V0_VOLTA;
                connector->doublescan_allowed = true;
        } else
        if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS ||
            nv_encoder->dcb->type == DCB_OUTPUT_TMDS) {
                connector->doublescan_allowed = false;
                connector->interlace_allowed = false;
        } else {
                connector->doublescan_allowed = true;
                if (drm->client.device.info.family == NV_DEVICE_INFO_V0_KELVIN ||
                    (drm->client.device.info.family == NV_DEVICE_INFO_V0_CELSIUS &&
                     (pdev->device & 0x0ff0) != 0x0100 &&
                     (pdev->device & 0x0ff0) != 0x0150))
                        /* HW is broken */
                        connector->interlace_allowed = false;
                else
                        connector->interlace_allowed = true;
        }

        if (nv_connector->type == DCB_CONNECTOR_DVI_I) {
                drm_object_property_set_value(&connector->base,
                        dev->mode_config.dvi_i_subconnector_property,
                        nv_encoder->dcb->type == DCB_OUTPUT_TMDS ?
                        DRM_MODE_SUBCONNECTOR_DVID :
                        DRM_MODE_SUBCONNECTOR_DVIA);
        }
}

static void
nouveau_connector_set_edid(struct nouveau_connector *nv_connector,
                           struct edid *edid)
{
        if (nv_connector->edid != edid) {
                struct edid *old_edid = nv_connector->edid;

                drm_connector_update_edid_property(&nv_connector->base, edid);
                kfree(old_edid);
                nv_connector->edid = edid;
        }
}

static enum drm_connector_status
nouveau_connector_detect(struct drm_connector *connector, bool force)
{
        struct drm_device *dev = connector->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = NULL;
        struct nouveau_encoder *nv_partner;
        int type;
        int ret;
        enum drm_connector_status conn_status = connector_status_disconnected;

        /* Outputs are only polled while runtime active, so resuming the
         * device here is unnecessary (and would deadlock upon runtime suspend
         * because it waits for polling to finish). We do however, want to
         * prevent the autosuspend timer from elapsing during this operation
         * if possible.
         */
        if (drm_kms_helper_is_poll_worker()) {
                pm_runtime_get_noresume(dev->dev);
        } else {
                ret = pm_runtime_get_sync(dev->dev);
                if (ret < 0 && ret != -EACCES) {
                        pm_runtime_put_autosuspend(dev->dev);
                        nouveau_connector_set_edid(nv_connector, NULL);
                        return conn_status;
                }
        }

        nv_encoder = nouveau_connector_ddc_detect(connector);
        if (nv_encoder) {
                struct edid *new_edid = NULL;

                if (nv_encoder->i2c) {
                        if ((vga_switcheroo_handler_flags() & VGA_SWITCHEROO_CAN_SWITCH_DDC) &&
                            nv_connector->type == DCB_CONNECTOR_LVDS)
                                new_edid = drm_get_edid_switcheroo(connector, nv_encoder->i2c);
                        else
                                new_edid = drm_get_edid(connector, nv_encoder->i2c);
                } else {
                        ret = nvif_outp_edid_get(&nv_encoder->outp, (u8 **)&new_edid);
                        if (ret < 0)
                                return connector_status_disconnected;
                }

                nouveau_connector_set_edid(nv_connector, new_edid);
                if (!nv_connector->edid) {
                        NV_ERROR(drm, "DDC responded, but no EDID for %s\n",
                                 connector->name);
                        goto detect_analog;
                }

                /* Override encoder type for DVI-I based on whether EDID
                 * says the display is digital or analog, both use the
                 * same i2c channel so the value returned from ddc_detect
                 * isn't necessarily correct.
                 */
                nv_partner = NULL;
                if (nv_encoder->dcb->type == DCB_OUTPUT_TMDS)
                        nv_partner = find_encoder(connector, DCB_OUTPUT_ANALOG);
                if (nv_encoder->dcb->type == DCB_OUTPUT_ANALOG)
                        nv_partner = find_encoder(connector, DCB_OUTPUT_TMDS);

                if (nv_partner && ((nv_encoder->dcb->type == DCB_OUTPUT_ANALOG &&
                                    nv_partner->dcb->type == DCB_OUTPUT_TMDS) ||
                                   (nv_encoder->dcb->type == DCB_OUTPUT_TMDS &&
                                    nv_partner->dcb->type == DCB_OUTPUT_ANALOG))) {
                        if (nv_connector->edid->input & DRM_EDID_INPUT_DIGITAL)
                                type = DCB_OUTPUT_TMDS;
                        else
                                type = DCB_OUTPUT_ANALOG;

                        nv_encoder = find_encoder(connector, type);
                }

                nouveau_connector_set_encoder(connector, nv_encoder);
                conn_status = connector_status_connected;

                if (nv_encoder->dcb->type == DCB_OUTPUT_DP)
                        drm_dp_cec_set_edid(&nv_connector->aux, nv_connector->edid);

                goto out;
        } else {
                nouveau_connector_set_edid(nv_connector, NULL);
        }

        nv_encoder = nouveau_connector_of_detect(connector);
        if (nv_encoder) {
                nouveau_connector_set_encoder(connector, nv_encoder);
                conn_status = connector_status_connected;
                goto out;
        }

detect_analog:
        nv_encoder = find_encoder(connector, DCB_OUTPUT_ANALOG);
        if (!nv_encoder && !nouveau_tv_disable)
                nv_encoder = find_encoder(connector, DCB_OUTPUT_TV);
        if (nv_encoder && force) {
                struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
                const struct drm_encoder_helper_funcs *helper =
                                                encoder->helper_private;

                if (helper->detect(encoder, connector) ==
                                                connector_status_connected) {
                        nouveau_connector_set_encoder(connector, nv_encoder);
                        conn_status = connector_status_connected;
                        goto out;
                }
        }

 out:
        if (!nv_connector->edid)
                drm_dp_cec_unset_edid(&nv_connector->aux);

        pm_runtime_mark_last_busy(dev->dev);
        pm_runtime_put_autosuspend(dev->dev);

        return conn_status;
}

static enum drm_connector_status
nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
{
        struct drm_device *dev = connector->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = NULL;
        struct edid *edid = NULL;
        enum drm_connector_status status = connector_status_disconnected;

        nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
        if (!nv_encoder)
                goto out;

        /* Try retrieving EDID via DDC */
        if (!drm->vbios.fp_no_ddc) {
                status = nouveau_connector_detect(connector, force);
                if (status == connector_status_connected) {
                        edid = nv_connector->edid;
                        goto out;
                }
        }

        /* On some laptops (Sony, i'm looking at you) there appears to
         * be no direct way of accessing the panel's EDID.  The only
         * option available to us appears to be to ask ACPI for help..
         *
         * It's important this check's before trying straps, one of the
         * said manufacturer's laptops are configured in such a way
         * the nouveau decides an entry in the VBIOS FP mode table is
         * valid - it's not (rh#613284)
         */
        if (nv_encoder->dcb->lvdsconf.use_acpi_for_edid) {
                edid = nouveau_acpi_edid(dev, connector);
                if (edid) {
                        status = connector_status_connected;
                        goto out;
                }
        }

        /* If no EDID found above, and the VBIOS indicates a hardcoded
         * modeline is avalilable for the panel, set it as the panel's
         * native mode and exit.
         */
        if (nouveau_bios_fp_mode(dev, NULL) && (drm->vbios.fp_no_ddc ||
            nv_encoder->dcb->lvdsconf.use_straps_for_mode)) {
                status = connector_status_connected;
                goto out;
        }

        /* Still nothing, some VBIOS images have a hardcoded EDID block
         * stored for the panel stored in them.
         */
        if (!drm->vbios.fp_no_ddc) {
                edid = (struct edid *)nouveau_bios_embedded_edid(dev);
                if (edid) {
                        edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
                        if (edid)
                                status = connector_status_connected;
                }
        }

out:
#if defined(CONFIG_ACPI_BUTTON) || \
        (defined(CONFIG_ACPI_BUTTON_MODULE) && defined(MODULE))
        if (status == connector_status_connected &&
            !nouveau_ignorelid && !acpi_lid_open())
                status = connector_status_unknown;
#endif

        nouveau_connector_set_edid(nv_connector, edid);
        if (nv_encoder)
                nouveau_connector_set_encoder(connector, nv_encoder);
        return status;
}

static void
nouveau_connector_force(struct drm_connector *connector)
{
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder;
        int type;

        if (nv_connector->type == DCB_CONNECTOR_DVI_I) {
                if (connector->force == DRM_FORCE_ON_DIGITAL)
                        type = DCB_OUTPUT_TMDS;
                else
                        type = DCB_OUTPUT_ANALOG;
        } else
                type = DCB_OUTPUT_ANY;

        nv_encoder = find_encoder(connector, type);
        if (!nv_encoder) {
                NV_ERROR(drm, "can't find encoder to force %s on!\n",
                         connector->name);
                return;
        }

        nouveau_connector_set_encoder(connector, nv_encoder);
}

static int
nouveau_connector_set_property(struct drm_connector *connector,
                               struct drm_property *property, uint64_t value)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
        struct nouveau_conn_atom *asyc = &nv_connector->properties_state;
        struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
        int ret;

        ret = connector->funcs->atomic_set_property(&nv_connector->base,
                                                    &asyc->state,
                                                    property, value);
        if (ret) {
                if (nv_encoder && nv_encoder->dcb->type == DCB_OUTPUT_TV)
                        return get_encoder_i2c_funcs(encoder)->set_property(encoder,
                                                                            connector,
                                                                            property,
                                                                            value);
                return ret;
        }

        nv_connector->scaling_mode = asyc->scaler.mode;
        nv_connector->dithering_mode = asyc->dither.mode;

        if (connector->encoder && connector->encoder->crtc) {
                ret = drm_crtc_helper_set_mode(connector->encoder->crtc,
                                              &connector->encoder->crtc->mode,
                                               connector->encoder->crtc->x,
                                               connector->encoder->crtc->y,
                                               NULL);
                if (!ret)
                        return -EINVAL;
        }

        return 0;
}

struct moderec {
        int hdisplay;
        int vdisplay;
};

static struct moderec scaler_modes[] = {
        { 1920, 1200 },
        { 1920, 1080 },
        { 1680, 1050 },
        { 1600, 1200 },
        { 1400, 1050 },
        { 1280, 1024 },
        { 1280, 960 },
        { 1152, 864 },
        { 1024, 768 },
        { 800, 600 },
        { 720, 400 },
        { 640, 480 },
        { 640, 400 },
        { 640, 350 },
        {}
};

static int
nouveau_connector_scaler_modes_add(struct drm_connector *connector)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct drm_display_mode *native = nv_connector->native_mode, *m;
        struct drm_device *dev = connector->dev;
        struct moderec *mode = &scaler_modes[0];
        int modes = 0;

        if (!native)
                return 0;

        while (mode->hdisplay) {
                if (mode->hdisplay <= native->hdisplay &&
                    mode->vdisplay <= native->vdisplay &&
                    (mode->hdisplay != native->hdisplay ||
                     mode->vdisplay != native->vdisplay)) {
                        m = drm_cvt_mode(dev, mode->hdisplay, mode->vdisplay,
                                         drm_mode_vrefresh(native), false,
                                         false, false);
                        if (!m)
                                continue;

                        drm_mode_probed_add(connector, m);
                        modes++;
                }

                mode++;
        }

        return modes;
}

static void
nouveau_connector_detect_depth(struct drm_connector *connector)
{
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
        struct nvbios *bios = &drm->vbios;
        struct drm_display_mode *mode = nv_connector->native_mode;
        bool duallink;

        /* if the edid is feeling nice enough to provide this info, use it */
        if (nv_connector->edid && connector->display_info.bpc)
                return;

        /* EDID 1.4 is *supposed* to be supported on eDP, but, Apple... */
        if (nv_connector->type == DCB_CONNECTOR_eDP) {
                connector->display_info.bpc = 6;
                return;
        }

        /* we're out of options unless we're LVDS, default to 8bpc */
        if (nv_encoder->dcb->type != DCB_OUTPUT_LVDS) {
                connector->display_info.bpc = 8;
                return;
        }

        connector->display_info.bpc = 6;

        /* LVDS: panel straps */
        if (bios->fp_no_ddc) {
                if (bios->fp.if_is_24bit)
                        connector->display_info.bpc = 8;
                return;
        }

        /* LVDS: DDC panel, need to first determine the number of links to
         * know which if_is_24bit flag to check...
         */
        if (nv_connector->edid &&
            nv_connector->type == DCB_CONNECTOR_LVDS_SPWG)
                duallink = ((u8 *)nv_connector->edid)[121] == 2;
        else
                duallink = mode->clock >= bios->fp.duallink_transition_clk;

        if ((!duallink && (bios->fp.strapless_is_24bit & 1)) ||
            ( duallink && (bios->fp.strapless_is_24bit & 2)))
                connector->display_info.bpc = 8;
}

static int
nouveau_connector_late_register(struct drm_connector *connector)
{
        int ret;

        ret = nouveau_backlight_init(connector);
        if (ret)
                return ret;

        if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
            connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) {
                ret = drm_dp_aux_register(&nouveau_connector(connector)->aux);
                if (ret)
                        goto backlight_fini;
        }

        return 0;
backlight_fini:
        nouveau_backlight_fini(connector);
        return ret;
}

static void
nouveau_connector_early_unregister(struct drm_connector *connector)
{
        if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
            connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort)
                drm_dp_aux_unregister(&nouveau_connector(connector)->aux);

        nouveau_backlight_fini(connector);
}

static int
nouveau_connector_get_modes(struct drm_connector *connector)
{
        struct drm_device *dev = connector->dev;
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
        struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
        int ret = 0;

        /* destroy the native mode, the attached monitor could have changed.
         */
        if (nv_connector->native_mode) {
                drm_mode_destroy(dev, nv_connector->native_mode);
                nv_connector->native_mode = NULL;
        }

        if (nv_connector->edid)
                ret = drm_add_edid_modes(connector, nv_connector->edid);
        else
        if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS &&
            (nv_encoder->dcb->lvdsconf.use_straps_for_mode ||
             drm->vbios.fp_no_ddc) && nouveau_bios_fp_mode(dev, NULL)) {
                struct drm_display_mode mode;

                nouveau_bios_fp_mode(dev, &mode);
                nv_connector->native_mode = drm_mode_duplicate(dev, &mode);
        }

        /* Determine display colour depth for everything except LVDS now,
         * DP requires this before mode_valid() is called.
         */
        if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS)
                nouveau_connector_detect_depth(connector);

        /* Find the native mode if this is a digital panel, if we didn't
         * find any modes through DDC previously add the native mode to
         * the list of modes.
         */
        if (!nv_connector->native_mode)
                nv_connector->native_mode = nouveau_conn_native_mode(connector);
        if (ret == 0 && nv_connector->native_mode) {
                struct drm_display_mode *mode;

                mode = drm_mode_duplicate(dev, nv_connector->native_mode);
                if (!mode)
                        return 0;

                drm_mode_probed_add(connector, mode);
                ret = 1;
        }

        /* Determine LVDS colour depth, must happen after determining
         * "native" mode as some VBIOS tables require us to use the
         * pixel clock as part of the lookup...
         */
        if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS && nv_connector->native_mode)
                nouveau_connector_detect_depth(connector);

        if (nv_encoder->dcb->type == DCB_OUTPUT_TV)
                ret = get_encoder_i2c_funcs(encoder)->get_modes(encoder, connector);

        if (nv_connector->type == DCB_CONNECTOR_LVDS ||
            nv_connector->type == DCB_CONNECTOR_LVDS_SPWG ||
            nv_connector->type == DCB_CONNECTOR_eDP)
                ret += nouveau_connector_scaler_modes_add(connector);

        return ret;
}

static unsigned
get_tmds_link_bandwidth(struct drm_connector *connector)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
        struct nouveau_drm *drm = nouveau_drm(connector->dev);
        struct dcb_output *dcb = nv_connector->detected_encoder->dcb;
        struct drm_display_info *info = NULL;
        unsigned duallink_scale =
                nouveau_duallink && nv_encoder->dcb->duallink_possible ? 2 : 1;

        if (nv_connector->base.display_info.is_hdmi) {
                info = &nv_connector->base.display_info;
                duallink_scale = 1;
        }

        if (info) {
                if (nouveau_hdmimhz > 0)
                        return nouveau_hdmimhz * 1000;
                /* Note: these limits are conservative, some Fermi's
                 * can do 297 MHz. Unclear how this can be determined.
                 */
                if (drm->client.device.info.chipset >= 0x120) {
                        const int max_tmds_clock =
                                info->hdmi.scdc.scrambling.supported ?
                                594000 : 340000;
                        return info->max_tmds_clock ?
                                min(info->max_tmds_clock, max_tmds_clock) :
                                max_tmds_clock;
                }
                if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_KEPLER)
                        return 297000;
                if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_FERMI)
                        return 225000;
        }

        if (dcb->location != DCB_LOC_ON_CHIP ||
            drm->client.device.info.chipset >= 0x46)
                return 165000 * duallink_scale;
        else if (drm->client.device.info.chipset >= 0x40)
                return 155000 * duallink_scale;
        else if (drm->client.device.info.chipset >= 0x18)
                return 135000 * duallink_scale;
        else
                return 112000 * duallink_scale;
}

static enum drm_mode_status
nouveau_connector_mode_valid(struct drm_connector *connector,
                             const struct drm_display_mode *mode)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);
        struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
        struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
        unsigned int min_clock = 25000, max_clock = min_clock, clock = mode->clock;

        switch (nv_encoder->dcb->type) {
        case DCB_OUTPUT_LVDS:
                if (nv_connector->native_mode &&
                    (mode->hdisplay > nv_connector->native_mode->hdisplay ||
                     mode->vdisplay > nv_connector->native_mode->vdisplay))
                        return MODE_PANEL;

                min_clock = 0;
                max_clock = 400000;
                break;
        case DCB_OUTPUT_TMDS:
                max_clock = get_tmds_link_bandwidth(connector);
                break;
        case DCB_OUTPUT_ANALOG:
                max_clock = nv_encoder->dcb->crtconf.maxfreq;
                if (!max_clock)
                        max_clock = 350000;
                break;
        case DCB_OUTPUT_TV:
                return get_encoder_i2c_funcs(encoder)->mode_valid(encoder, mode);
        case DCB_OUTPUT_DP:
                return nv50_dp_mode_valid(nv_encoder, mode, NULL);
        default:
                BUG();
                return MODE_BAD;
        }

        if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
                clock *= 2;

        if (clock < min_clock)
                return MODE_CLOCK_LOW;
        if (clock > max_clock)
                return MODE_CLOCK_HIGH;

        return MODE_OK;
}

static struct drm_encoder *
nouveau_connector_best_encoder(struct drm_connector *connector)
{
        struct nouveau_connector *nv_connector = nouveau_connector(connector);

        if (nv_connector->detected_encoder)
                return to_drm_encoder(nv_connector->detected_encoder);

        return NULL;
}

static int
nouveau_connector_atomic_check(struct drm_connector *connector, struct drm_atomic_state *state)
{
        struct nouveau_connector *nv_conn = nouveau_connector(connector);
        struct drm_connector_state *conn_state =
                drm_atomic_get_new_connector_state(state, connector);

        if (!nv_conn->dp_encoder || !nv_conn->dp_encoder->dp.mstm)
                return 0;

        return drm_dp_mst_root_conn_atomic_check(conn_state, &nv_conn->dp_encoder->dp.mstm->mgr);
}

static const struct drm_connector_helper_funcs
nouveau_connector_helper_funcs = {
        .get_modes = nouveau_connector_get_modes,
        .mode_valid = nouveau_connector_mode_valid,
        .best_encoder = nouveau_connector_best_encoder,
        .atomic_check = nouveau_connector_atomic_check,
};

static const struct drm_connector_funcs
nouveau_connector_funcs = {
        .dpms = drm_helper_connector_dpms,
        .reset = nouveau_conn_reset,
        .detect = nouveau_connector_detect,
        .force = nouveau_connector_force,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .set_property = nouveau_connector_set_property,
        .destroy = nouveau_connector_destroy,
        .atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
        .atomic_destroy_state = nouveau_conn_atomic_destroy_state,
        .atomic_set_property = nouveau_conn_atomic_set_property,
        .atomic_get_property = nouveau_conn_atomic_get_property,
        .late_register = nouveau_connector_late_register,
        .early_unregister = nouveau_connector_early_unregister,
};

static const struct drm_connector_funcs
nouveau_connector_funcs_lvds = {
        .dpms = drm_helper_connector_dpms,
        .reset = nouveau_conn_reset,
        .detect = nouveau_connector_detect_lvds,
        .force = nouveau_connector_force,
        .fill_modes = drm_helper_probe_single_connector_modes,
        .set_property = nouveau_connector_set_property,
        .destroy = nouveau_connector_destroy,
        .atomic_duplicate_state = nouveau_conn_atomic_duplicate_state,
        .atomic_destroy_state = nouveau_conn_atomic_destroy_state,
        .atomic_set_property = nouveau_conn_atomic_set_property,
        .atomic_get_property = nouveau_conn_atomic_get_property,
        .late_register = nouveau_connector_late_register,
        .early_unregister = nouveau_connector_early_unregister,
};

void
nouveau_connector_hpd(struct nouveau_connector *nv_connector, u64 bits)
{
        struct nouveau_drm *drm = nouveau_drm(nv_connector->base.dev);
        u32 mask = drm_connector_mask(&nv_connector->base);
        unsigned long flags;

        spin_lock_irqsave(&drm->hpd_lock, flags);
        if (!(drm->hpd_pending & mask)) {
                nv_connector->hpd_pending |= bits;
                drm->hpd_pending |= mask;
                schedule_work(&drm->hpd_work);
        }
        spin_unlock_irqrestore(&drm->hpd_lock, flags);
}

static int
nouveau_connector_irq(struct nvif_event *event, void *repv, u32 repc)
{
        struct nouveau_connector *nv_connector = container_of(event, typeof(*nv_connector), irq);

        schedule_work(&nv_connector->irq_work);
        return NVIF_EVENT_KEEP;
}

static int
nouveau_connector_hotplug(struct nvif_event *event, void *repv, u32 repc)
{
        struct nouveau_connector *nv_connector = container_of(event, typeof(*nv_connector), hpd);
        struct nvif_conn_event_v0 *rep = repv;

        nouveau_connector_hpd(nv_connector, rep->types);
        return NVIF_EVENT_KEEP;
}

static ssize_t
nouveau_connector_aux_xfer(struct drm_dp_aux *obj, struct drm_dp_aux_msg *msg)
{
        struct nouveau_connector *nv_connector =
                container_of(obj, typeof(*nv_connector), aux);
        struct nouveau_encoder *nv_encoder;
        u8 size = msg->size;
        int ret;

        if (pm_runtime_suspended(nv_connector->base.dev->dev))
                return -EBUSY;

        nv_encoder = find_encoder(&nv_connector->base, DCB_OUTPUT_DP);
        if (!nv_encoder)
                return -ENODEV;
        if (WARN_ON(msg->size > 16))
                return -E2BIG;

        ret = nvif_outp_dp_aux_xfer(&nv_encoder->outp,
                                    msg->request, &size, msg->address, msg->buffer);
        if (ret >= 0) {
                msg->reply = ret;
                return size;
        }

        return ret;
}

static int
drm_conntype_from_dcb(enum dcb_connector_type dcb)
{
        switch (dcb) {
        case DCB_CONNECTOR_VGA      : return DRM_MODE_CONNECTOR_VGA;
        case DCB_CONNECTOR_TV_0     :
        case DCB_CONNECTOR_TV_1     :
        case DCB_CONNECTOR_TV_3     : return DRM_MODE_CONNECTOR_TV;
        case DCB_CONNECTOR_DMS59_0  :
        case DCB_CONNECTOR_DMS59_1  :
        case DCB_CONNECTOR_DVI_I    : return DRM_MODE_CONNECTOR_DVII;
        case DCB_CONNECTOR_DVI_D    : return DRM_MODE_CONNECTOR_DVID;
        case DCB_CONNECTOR_LVDS     :
        case DCB_CONNECTOR_LVDS_SPWG: return DRM_MODE_CONNECTOR_LVDS;
        case DCB_CONNECTOR_DMS59_DP0:
        case DCB_CONNECTOR_DMS59_DP1:
        case DCB_CONNECTOR_DP       :
        case DCB_CONNECTOR_mDP      :
        case DCB_CONNECTOR_USB_C    : return DRM_MODE_CONNECTOR_DisplayPort;
        case DCB_CONNECTOR_eDP      : return DRM_MODE_CONNECTOR_eDP;
        case DCB_CONNECTOR_HDMI_0   :
        case DCB_CONNECTOR_HDMI_1   :
        case DCB_CONNECTOR_HDMI_C   : return DRM_MODE_CONNECTOR_HDMIA;
        case DCB_CONNECTOR_WFD      : return DRM_MODE_CONNECTOR_VIRTUAL;
        default:
                break;
        }

        return DRM_MODE_CONNECTOR_Unknown;
}

struct drm_connector *
nouveau_connector_create(struct drm_device *dev, int index)
{
        struct nouveau_drm *drm = nouveau_drm(dev);
        struct nouveau_display *disp = nouveau_display(dev);
        struct nouveau_connector *nv_connector = NULL;
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        int type, ret = 0;
        bool dummy;

        drm_connector_list_iter_begin(dev, &conn_iter);
        nouveau_for_each_non_mst_connector_iter(connector, &conn_iter) {
                nv_connector = nouveau_connector(connector);
                if (nv_connector->index == index) {
                        drm_connector_list_iter_end(&conn_iter);
                        return connector;
                }
        }
        drm_connector_list_iter_end(&conn_iter);

        nv_connector = kzalloc_obj(*nv_connector);
        if (!nv_connector)
                return ERR_PTR(-ENOMEM);

        connector = &nv_connector->base;
        nv_connector->index = index;
        INIT_WORK(&nv_connector->irq_work, nouveau_dp_irq);

        if (disp->disp.conn_mask & BIT(nv_connector->index)) {
                ret = nvif_conn_ctor(&disp->disp, nv_connector->base.name, nv_connector->index,
                                     &nv_connector->conn);
                if (ret) {
                        kfree(nv_connector);
                        return ERR_PTR(ret);
                }

                switch (nv_connector->conn.info.type) {
                case NVIF_CONN_VGA      : type = DCB_CONNECTOR_VGA; break;
                case NVIF_CONN_DVI_I    : type = DCB_CONNECTOR_DVI_I; break;
                case NVIF_CONN_DVI_D    : type = DCB_CONNECTOR_DVI_D; break;
                case NVIF_CONN_LVDS     : type = DCB_CONNECTOR_LVDS; break;
                case NVIF_CONN_LVDS_SPWG: type = DCB_CONNECTOR_LVDS_SPWG; break;
                case NVIF_CONN_DP       : type = DCB_CONNECTOR_DP; break;
                case NVIF_CONN_EDP      : type = DCB_CONNECTOR_eDP; break;
                case NVIF_CONN_HDMI     : type = DCB_CONNECTOR_HDMI_0; break;
                default:
                        WARN_ON(1);
                        return NULL;
                }

                nv_connector->type = type;
        } else {
                u8 *dcb = olddcb_conn(dev, nv_connector->index);

                if (dcb)
                        nv_connector->type = dcb[0];
                else
                        nv_connector->type = DCB_CONNECTOR_NONE;

                /* attempt to parse vbios connector type and hotplug gpio */
                if (nv_connector->type != DCB_CONNECTOR_NONE) {
                        if (drm_conntype_from_dcb(nv_connector->type) ==
                                                  DRM_MODE_CONNECTOR_Unknown) {
                                NV_WARN(drm, "unknown connector type %02x\n",
                                        nv_connector->type);
                                nv_connector->type = DCB_CONNECTOR_NONE;
                        }
                }

                /* no vbios data, or an unknown dcb connector type - attempt to
                 * figure out something suitable ourselves
                 */
                if (nv_connector->type == DCB_CONNECTOR_NONE &&
                    !WARN_ON(drm->client.device.info.family >= NV_DEVICE_INFO_V0_TESLA)) {
                        struct dcb_table *dcbt = &drm->vbios.dcb;
                        u32 encoders = 0;
                        int i;

                        for (i = 0; i < dcbt->entries; i++) {
                                if (dcbt->entry[i].connector == nv_connector->index)
                                        encoders |= (1 << dcbt->entry[i].type);
                        }

                        if (encoders & (1 << DCB_OUTPUT_TMDS)) {
                                if (encoders & (1 << DCB_OUTPUT_ANALOG))
                                        nv_connector->type = DCB_CONNECTOR_DVI_I;
                                else
                                        nv_connector->type = DCB_CONNECTOR_DVI_D;
                        } else
                        if (encoders & (1 << DCB_OUTPUT_ANALOG)) {
                                nv_connector->type = DCB_CONNECTOR_VGA;
                        } else
                        if (encoders & (1 << DCB_OUTPUT_LVDS)) {
                                nv_connector->type = DCB_CONNECTOR_LVDS;
                        } else
                        if (encoders & (1 << DCB_OUTPUT_TV)) {
                                nv_connector->type = DCB_CONNECTOR_TV_0;
                        }
                }
        }

        type = drm_conntype_from_dcb(nv_connector->type);
        if (type == DRM_MODE_CONNECTOR_LVDS)
                drm_connector_init(dev, connector, &nouveau_connector_funcs_lvds, type);
        else
                drm_connector_init(dev, connector, &nouveau_connector_funcs, type);

        switch (type) {
        case DRM_MODE_CONNECTOR_LVDS:
                ret = nouveau_bios_parse_lvds_table(dev, 0, &dummy, &dummy);
                if (ret) {
                        NV_ERROR(drm, "Error parsing LVDS table, disabling\n");
                        kfree(nv_connector);
                        return ERR_PTR(ret);
                }

                break;
        case DRM_MODE_CONNECTOR_DisplayPort:
        case DRM_MODE_CONNECTOR_eDP:
                nv_connector->aux.dev = connector->kdev;
                nv_connector->aux.drm_dev = dev;
                nv_connector->aux.transfer = nouveau_connector_aux_xfer;
                nv_connector->aux.name = connector->name;
                if (disp->disp.object.oclass >= GB202_DISP)
                        nv_connector->aux.no_zero_sized = true;
                drm_dp_aux_init(&nv_connector->aux);
                break;
        default:
                break;
        }

        /* HDMI 3D support */
        if ((disp->disp.object.oclass >= G82_DISP)
            && ((type == DRM_MODE_CONNECTOR_DisplayPort)
                || (type == DRM_MODE_CONNECTOR_eDP)
                || (type == DRM_MODE_CONNECTOR_HDMIA)))
                connector->stereo_allowed = true;

        /* defaults, will get overridden in detect() */
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;

        drm_connector_helper_add(connector, &nouveau_connector_helper_funcs);
        connector->polled = DRM_CONNECTOR_POLL_CONNECT;

        if (nvif_object_constructed(&nv_connector->conn.object)) {
                ret = nvif_conn_event_ctor(&nv_connector->conn, "kmsHotplug",
                                           nouveau_connector_hotplug,
                                           NVIF_CONN_EVENT_V0_PLUG | NVIF_CONN_EVENT_V0_UNPLUG,
                                           &nv_connector->hpd);
                if (ret == 0)
                        connector->polled = DRM_CONNECTOR_POLL_HPD;

                if (nv_connector->aux.transfer) {
                        ret = nvif_conn_event_ctor(&nv_connector->conn, "kmsDpIrq",
                                                   nouveau_connector_irq, NVIF_CONN_EVENT_V0_IRQ,
                                                   &nv_connector->irq);
                        if (ret) {
                                nvif_event_dtor(&nv_connector->hpd);
                                nvif_conn_dtor(&nv_connector->conn);
                                goto drm_conn_err;
                        }
                }
        }

        connector->funcs->reset(connector);
        nouveau_conn_attach_properties(connector);

        /* Default scaling mode */
        switch (nv_connector->type) {
        case DCB_CONNECTOR_LVDS:
        case DCB_CONNECTOR_LVDS_SPWG:
        case DCB_CONNECTOR_eDP:
                /* see note in nouveau_connector_set_property() */
                if (disp->disp.object.oclass < NV50_DISP) {
                        nv_connector->scaling_mode = DRM_MODE_SCALE_FULLSCREEN;
                        break;
                }
                nv_connector->scaling_mode = DRM_MODE_SCALE_NONE;
                break;
        default:
                nv_connector->scaling_mode = DRM_MODE_SCALE_NONE;
                break;
        }

        /* dithering properties */
        switch (nv_connector->type) {
        case DCB_CONNECTOR_TV_0:
        case DCB_CONNECTOR_TV_1:
        case DCB_CONNECTOR_TV_3:
        case DCB_CONNECTOR_VGA:
                break;
        default:
                nv_connector->dithering_mode = DITHERING_MODE_AUTO;
                break;
        }

        switch (type) {
        case DRM_MODE_CONNECTOR_DisplayPort:
                nv_connector->dp_encoder = find_encoder(&nv_connector->base, DCB_OUTPUT_DP);
                fallthrough;
        case DRM_MODE_CONNECTOR_eDP:
                drm_dp_cec_register_connector(&nv_connector->aux, connector);
                break;
        }

        drm_connector_register(connector);
        return connector;

drm_conn_err:
        drm_connector_cleanup(connector);
        kfree(nv_connector);
        return ERR_PTR(ret);
}