nouveau_connector.c

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/*
 * 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 <drm/drmP.h>
#include <drm/drm_edid.h>
#include <drm/drm_crtc_helper.h>

#include "nouveau_reg.h"
#include "nouveau_drm.h"
#include "nouveau_hw.h"
#include "nouveau_acpi.h"

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

#include <subdev/i2c.h>
#include <subdev/gpio.h>

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

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

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

static void nouveau_connector_hotplug(void *, int);

struct nouveau_encoder *
find_encoder(struct drm_connector *connector, int type)
{
    struct drm_device *dev = connector->dev;
    struct nouveau_encoder *nv_encoder;
    struct drm_mode_object *obj;
    int i, id;

    for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
        id = connector->encoder_ids[i];
        if (!id)
            break;

        obj = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
        if (!obj)
            continue;
        nv_encoder = nouveau_encoder(obj_to_encoder(obj));

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

    return NULL;
}

struct nouveau_connector *
nouveau_encoder_connector_get(struct nouveau_encoder *encoder)
{
    struct drm_device *dev = to_drm_encoder(encoder)->dev;
    struct drm_connector *drm_connector;

    list_for_each_entry(drm_connector, &dev->mode_config.connector_list, head) {
        if (drm_connector->encoder == to_drm_encoder(encoder))
            return nouveau_connector(drm_connector);
    }

    return NULL;
}

static void
nouveau_connector_destroy(struct drm_connector *connector)
{
    struct nouveau_connector *nv_connector = nouveau_connector(connector);
    struct nouveau_gpio *gpio;
    struct nouveau_drm *drm;
    struct drm_device *dev;

    if (!nv_connector)
        return;

    dev  = nv_connector->base.dev;
    drm  = nouveau_drm(dev);
    gpio = nouveau_gpio(drm->device);
    NV_DEBUG(drm, "\n");

    if (gpio && nv_connector->hpd != DCB_GPIO_UNUSED) {
        gpio->isr_del(gpio, 0, nv_connector->hpd, 0xff,
                  nouveau_connector_hotplug, connector);
    }

    kfree(nv_connector->edid);
    drm_sysfs_connector_remove(connector);
    drm_connector_cleanup(connector);
    kfree(connector);
}

static struct nouveau_i2c_port *
nouveau_connector_ddc_detect(struct drm_connector *connector,
                 struct nouveau_encoder **pnv_encoder)
{
    struct drm_device *dev = connector->dev;
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_i2c *i2c = nouveau_i2c(drm->device);
    int i;

    for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++) {
        struct nouveau_i2c_port *port = NULL;
        struct nouveau_encoder *nv_encoder;
        struct drm_mode_object *obj;
        int id;

        id = connector->encoder_ids[i];
        if (!id)
            break;

        obj = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_ENCODER);
        if (!obj)
            continue;
        nv_encoder = nouveau_encoder(obj_to_encoder(obj));

        if (nv_encoder->dcb->i2c_index < 0xf)
            port = i2c->find(i2c, nv_encoder->dcb->i2c_index);
        if (port && nv_probe_i2c(port, 0x50)) {
            *pnv_encoder = nv_encoder;
            return port;
        }
    }

    return NULL;
}

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 device_node *cn, *dn = pci_device_to_OF_node(dev->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(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);
            of_node_put(cn);
            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;

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

    if (nv_device(drm->device)->card_type >= NV_50) {
        connector->interlace_allowed = true;
        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 (nv_device(drm->device)->card_type == NV_20 ||
           (nv_device(drm->device)->card_type == NV_10 &&
            (dev->pci_device & 0x0ff0) != 0x0100 &&
            (dev->pci_device & 0x0ff0) != 0x0150))
            /* HW is broken */
            connector->interlace_allowed = false;
        else
            connector->interlace_allowed = true;
    }

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

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;
    struct nouveau_i2c_port *i2c;
    int type;

    /* Cleanup the previous EDID block. */
    if (nv_connector->edid) {
        drm_mode_connector_update_edid_property(connector, NULL);
        kfree(nv_connector->edid);
        nv_connector->edid = NULL;
    }

    i2c = nouveau_connector_ddc_detect(connector, &nv_encoder);
    if (i2c) {
        nv_connector->edid = drm_get_edid(connector, &i2c->adapter);
        drm_mode_connector_update_edid_property(connector,
                            nv_connector->edid);
        if (!nv_connector->edid) {
            NV_ERROR(drm, "DDC responded, but no EDID for %s\n",
                 drm_get_connector_name(connector));
            goto detect_analog;
        }

        if (nv_encoder->dcb->type == DCB_OUTPUT_DP &&
            !nouveau_dp_detect(to_drm_encoder(nv_encoder))) {
            NV_ERROR(drm, "Detected %s, but failed init\n",
                 drm_get_connector_name(connector));
            return connector_status_disconnected;
        }

        /* 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);
        return connector_status_connected;
    }

    nv_encoder = nouveau_connector_of_detect(connector);
    if (nv_encoder) {
        nouveau_connector_set_encoder(connector, nv_encoder);
        return connector_status_connected;
    }

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);
        struct drm_encoder_helper_funcs *helper =
                        encoder->helper_private;

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

    }

    return connector_status_disconnected;
}

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;
    enum drm_connector_status status = connector_status_disconnected;

    /* Cleanup the previous EDID block. */
    if (nv_connector->edid) {
        drm_mode_connector_update_edid_property(connector, NULL);
        kfree(nv_connector->edid);
        nv_connector->edid = NULL;
    }

    nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
    if (!nv_encoder)
        return connector_status_disconnected;

    /* Try retrieving EDID via DDC */
    if (!drm->vbios.fp_no_ddc) {
        status = nouveau_connector_detect(connector, force);
        if (status == connector_status_connected)
            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) {
        if ((nv_connector->edid = nouveau_acpi_edid(dev, connector))) {
            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) {
        struct edid *edid =
            (struct edid *)nouveau_bios_embedded_edid(dev);
        if (edid) {
            nv_connector->edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
            *(nv_connector->edid) = *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

    drm_mode_connector_update_edid_property(connector, nv_connector->edid);
    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",
             drm_get_connector_name(connector));
        connector->status = connector_status_disconnected;
        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_display *disp = nouveau_display(connector->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);
    struct drm_device *dev = connector->dev;
    struct nouveau_crtc *nv_crtc;
    int ret;

    nv_crtc = NULL;
    if (connector->encoder && connector->encoder->crtc)
        nv_crtc = nouveau_crtc(connector->encoder->crtc);

    /* Scaling mode */
    if (property == dev->mode_config.scaling_mode_property) {
        bool modeset = false;

        switch (value) {
        case DRM_MODE_SCALE_NONE:
        case DRM_MODE_SCALE_FULLSCREEN:
        case DRM_MODE_SCALE_CENTER:
        case DRM_MODE_SCALE_ASPECT:
            break;
        default:
            return -EINVAL;
        }

        /* LVDS always needs gpu scaling */
        if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS &&
            value == DRM_MODE_SCALE_NONE)
            return -EINVAL;

        /* Changing between GPU and panel scaling requires a full
         * modeset
         */
        if ((nv_connector->scaling_mode == DRM_MODE_SCALE_NONE) ||
            (value == DRM_MODE_SCALE_NONE))
            modeset = true;
        nv_connector->scaling_mode = value;

        if (!nv_crtc)
            return 0;

        if (modeset || !nv_crtc->set_scale) {
            ret = drm_crtc_helper_set_mode(&nv_crtc->base,
                            &nv_crtc->base.mode,
                            nv_crtc->base.x,
                            nv_crtc->base.y, NULL);
            if (!ret)
                return -EINVAL;
        } else {
            ret = nv_crtc->set_scale(nv_crtc, true);
            if (ret)
                return ret;
        }

        return 0;
    }

    /* Underscan */
    if (property == disp->underscan_property) {
        if (nv_connector->underscan != value) {
            nv_connector->underscan = value;
            if (!nv_crtc || !nv_crtc->set_scale)
                return 0;

            return nv_crtc->set_scale(nv_crtc, true);
        }

        return 0;
    }

    if (property == disp->underscan_hborder_property) {
        if (nv_connector->underscan_hborder != value) {
            nv_connector->underscan_hborder = value;
            if (!nv_crtc || !nv_crtc->set_scale)
                return 0;

            return nv_crtc->set_scale(nv_crtc, true);
        }

        return 0;
    }

    if (property == disp->underscan_vborder_property) {
        if (nv_connector->underscan_vborder != value) {
            nv_connector->underscan_vborder = value;
            if (!nv_crtc || !nv_crtc->set_scale)
                return 0;

            return nv_crtc->set_scale(nv_crtc, true);
        }

        return 0;
    }

    /* Dithering */
    if (property == disp->dithering_mode) {
        nv_connector->dithering_mode = value;
        if (!nv_crtc || !nv_crtc->set_dither)
            return 0;

        return nv_crtc->set_dither(nv_crtc, true);
    }

    if (property == disp->dithering_depth) {
        nv_connector->dithering_depth = value;
        if (!nv_crtc || !nv_crtc->set_dither)
            return 0;

        return nv_crtc->set_dither(nv_crtc, true);
    }

    if (nv_crtc && nv_crtc->set_color_vibrance) {
        /* Hue */
        if (property == disp->vibrant_hue_property) {
            nv_crtc->vibrant_hue = value - 90;
            return nv_crtc->set_color_vibrance(nv_crtc, true);
        }
        /* Saturation */
        if (property == disp->color_vibrance_property) {
            nv_crtc->color_vibrance = value - 100;
            return nv_crtc->set_color_vibrance(nv_crtc, true);
        }
    }

    if (nv_encoder && nv_encoder->dcb->type == DCB_OUTPUT_TV)
        return get_slave_funcs(encoder)->set_property(
            encoder, connector, property, value);

    return -EINVAL;
}

static struct drm_display_mode *
nouveau_connector_native_mode(struct drm_connector *connector)
{
    struct drm_connector_helper_funcs *helper = connector->helper_private;
    struct nouveau_drm *drm = nouveau_drm(connector->dev);
    struct nouveau_connector *nv_connector = nouveau_connector(connector);
    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, &nv_connector->base.probed_modes, head) {
        mode->vrefresh = drm_mode_vrefresh(mode);
        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 &&
            mode->vrefresh < high_v)
            continue;

        high_w = mode->hdisplay;
        high_h = mode->vdisplay;
        high_v = mode->vrefresh;
        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;
}

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

            m->type |= DRM_MODE_TYPE_DRIVER;

            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_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_connector_native_mode(connector);
    if (ret == 0 && nv_connector->native_mode) {
        struct drm_display_mode *mode;

        mode = drm_mode_duplicate(dev, nv_connector->native_mode);
        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)
        nouveau_connector_detect_depth(connector);

    if (nv_encoder->dcb->type == DCB_OUTPUT_TV)
        ret = get_slave_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_drm *drm = nouveau_drm(connector->dev);
    struct dcb_output *dcb = nv_connector->detected_encoder->dcb;

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

static int
nouveau_connector_mode_valid(struct drm_connector *connector,
                 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 min_clock = 25000, max_clock = min_clock;
    unsigned 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);
        if (nouveau_duallink && nv_encoder->dcb->duallink_possible)
            max_clock *= 2;
        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_slave_funcs(encoder)->mode_valid(encoder, mode);
    case DCB_OUTPUT_DP:
        max_clock  = nv_encoder->dp.link_nr;
        max_clock *= nv_encoder->dp.link_bw;
        clock = clock * (connector->display_info.bpc * 3) / 10;
        break;
    default:
        BUG_ON(1);
        return MODE_BAD;
    }

    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 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,
};

static const struct drm_connector_funcs
nouveau_connector_funcs = {
    .dpms = drm_helper_connector_dpms,
    .save = NULL,
    .restore = NULL,
    .detect = nouveau_connector_detect,
    .destroy = nouveau_connector_destroy,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .set_property = nouveau_connector_set_property,
    .force = nouveau_connector_force
};

static const struct drm_connector_funcs
nouveau_connector_funcs_lvds = {
    .dpms = drm_helper_connector_dpms,
    .save = NULL,
    .restore = NULL,
    .detect = nouveau_connector_detect_lvds,
    .destroy = nouveau_connector_destroy,
    .fill_modes = drm_helper_probe_single_connector_modes,
    .set_property = nouveau_connector_set_property,
    .force = nouveau_connector_force
};

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       : return DRM_MODE_CONNECTOR_DisplayPort;
    case DCB_CONNECTOR_eDP      : return DRM_MODE_CONNECTOR_eDP;
    case DCB_CONNECTOR_HDMI_0   :
    case DCB_CONNECTOR_HDMI_1   : return DRM_MODE_CONNECTOR_HDMIA;
    default:
        break;
    }

    return DRM_MODE_CONNECTOR_Unknown;
}

struct drm_connector *
nouveau_connector_create(struct drm_device *dev, int index)
{
    const struct drm_connector_funcs *funcs = &nouveau_connector_funcs;
    struct nouveau_drm *drm = nouveau_drm(dev);
    struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
    struct nouveau_display *disp = nouveau_display(dev);
    struct nouveau_connector *nv_connector = NULL;
    struct drm_connector *connector;
    int type, ret = 0;
    bool dummy;

    NV_DEBUG(drm, "\n");

    list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
        nv_connector = nouveau_connector(connector);
        if (nv_connector->index == index)
            return connector;
    }

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

    connector = &nv_connector->base;
    nv_connector->index = index;

    /* attempt to parse vbios connector type and hotplug gpio */
    nv_connector->dcb = olddcb_conn(dev, index);
    if (nv_connector->dcb) {
        static const u8 hpd[16] = {
            0xff, 0x07, 0x08, 0xff, 0xff, 0x51, 0x52, 0xff,
            0xff, 0xff, 0xff, 0xff, 0xff, 0x5e, 0x5f, 0x60,
        };

        u32 entry = ROM16(nv_connector->dcb[0]);
        if (olddcb_conntab(dev)[3] >= 4)
            entry |= (u32)ROM16(nv_connector->dcb[2]) << 16;

        nv_connector->hpd = ffs((entry & 0x07033000) >> 12);
        nv_connector->hpd = hpd[nv_connector->hpd];

        nv_connector->type = nv_connector->dcb[0];
        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;
        }

        /* Gigabyte NX85T */
        if (nv_match_device(dev, 0x0421, 0x1458, 0x344c)) {
            if (nv_connector->type == DCB_CONNECTOR_HDMI_1)
                nv_connector->type = DCB_CONNECTOR_DVI_I;
        }

        /* Gigabyte GV-NX86T512H */
        if (nv_match_device(dev, 0x0402, 0x1458, 0x3455)) {
            if (nv_connector->type == DCB_CONNECTOR_HDMI_1)
                nv_connector->type = DCB_CONNECTOR_DVI_I;
        }
    } else {
        nv_connector->type = DCB_CONNECTOR_NONE;
        nv_connector->hpd = DCB_GPIO_UNUSED;
    }

    /* no vbios data, or an unknown dcb connector type - attempt to
     * figure out something suitable ourselves
     */
    if (nv_connector->type == DCB_CONNECTOR_NONE) {
        struct nouveau_drm *drm = nouveau_drm(dev);
        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_DP)) {
            if (encoders & (1 << DCB_OUTPUT_TMDS))
                nv_connector->type = DCB_CONNECTOR_DP;
            else
                nv_connector->type = DCB_CONNECTOR_eDP;
        } else
        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) {
        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);
        }

        funcs = &nouveau_connector_funcs_lvds;
    } else {
        funcs = &nouveau_connector_funcs;
    }

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

    drm_connector_init(dev, connector, funcs, type);
    drm_connector_helper_add(connector, &nouveau_connector_helper_funcs);

    /* Init DVI-I specific properties */
    if (nv_connector->type == DCB_CONNECTOR_DVI_I)
        drm_connector_attach_property(connector, dev->mode_config.dvi_i_subconnector_property, 0);

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

    /* Add hue and saturation options */
    if (disp->vibrant_hue_property)
        drm_connector_attach_property(connector,
                          disp->vibrant_hue_property,
                          90);
    if (disp->color_vibrance_property)
        drm_connector_attach_property(connector,
                          disp->color_vibrance_property,
                          150);

    switch (nv_connector->type) {
    case DCB_CONNECTOR_VGA:
        if (nv_device(drm->device)->card_type >= NV_50) {
            drm_connector_attach_property(connector,
                    dev->mode_config.scaling_mode_property,
                    nv_connector->scaling_mode);
        }
        /* fall-through */
    case DCB_CONNECTOR_TV_0:
    case DCB_CONNECTOR_TV_1:
    case DCB_CONNECTOR_TV_3:
        nv_connector->scaling_mode = DRM_MODE_SCALE_NONE;
        break;
    default:
        nv_connector->scaling_mode = DRM_MODE_SCALE_FULLSCREEN;

        drm_connector_attach_property(connector,
                dev->mode_config.scaling_mode_property,
                nv_connector->scaling_mode);
        if (disp->dithering_mode) {
            nv_connector->dithering_mode = DITHERING_MODE_AUTO;
            drm_connector_attach_property(connector,
                        disp->dithering_mode,
                        nv_connector->dithering_mode);
        }
        if (disp->dithering_depth) {
            nv_connector->dithering_depth = DITHERING_DEPTH_AUTO;
            drm_connector_attach_property(connector,
                        disp->dithering_depth,
                        nv_connector->dithering_depth);
        }
        break;
    }

    connector->polled = DRM_CONNECTOR_POLL_CONNECT;
    if (gpio && nv_connector->hpd != DCB_GPIO_UNUSED) {
        ret = gpio->isr_add(gpio, 0, nv_connector->hpd, 0xff,
                    nouveau_connector_hotplug, connector);
        if (ret == 0)
            connector->polled = DRM_CONNECTOR_POLL_HPD;
    }

    drm_sysfs_connector_add(connector);
    return connector;
}

static void
nouveau_connector_hotplug(void *data, int plugged)
{
    struct drm_connector *connector = data;
    struct drm_device *dev = connector->dev;
    struct nouveau_drm *drm = nouveau_drm(dev);

    NV_DEBUG(drm, "%splugged %s\n", plugged ? "" : "un",
         drm_get_connector_name(connector));

    if (plugged)
        drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
    else
        drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);

    drm_helper_hpd_irq_event(dev);
}