/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Dave Airlie
 *          Alex Deucher
 */

#include <drm/drm_crtc_helper.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "amdgpu_connectors.h"
#include "amdgpu_display.h"
#include "atom.h"
#include "atombios_encoders.h"

void
amdgpu_link_encoder_connector(struct drm_device *dev)
{
        struct amdgpu_device *adev = dev->dev_private;
        struct drm_connector *connector;
        struct drm_connector_list_iter iter;
        struct amdgpu_connector *amdgpu_connector;
        struct drm_encoder *encoder;
        struct amdgpu_encoder *amdgpu_encoder;

        drm_connector_list_iter_begin(dev, &iter);
        /* walk the list and link encoders to connectors */
        drm_for_each_connector_iter(connector, &iter) {
                amdgpu_connector = to_amdgpu_connector(connector);
                list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
                        amdgpu_encoder = to_amdgpu_encoder(encoder);
                        if (amdgpu_encoder->devices & amdgpu_connector->devices) {
                                drm_connector_attach_encoder(connector, encoder);
                                if (amdgpu_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT)) {
                                        amdgpu_atombios_encoder_init_backlight(amdgpu_encoder, connector);
                                        adev->mode_info.bl_encoder = amdgpu_encoder;
                                }
                        }
                }
        }
        drm_connector_list_iter_end(&iter);
}

void amdgpu_encoder_set_active_device(struct drm_encoder *encoder)
{
        struct drm_device *dev = encoder->dev;
        struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
        struct drm_connector *connector;
        struct drm_connector_list_iter iter;

        drm_connector_list_iter_begin(dev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                if (connector->encoder == encoder) {
                        struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
                        amdgpu_encoder->active_device = amdgpu_encoder->devices & amdgpu_connector->devices;
                        DRM_DEBUG_KMS("setting active device to %08x from %08x %08x for encoder %d\n",
                                  amdgpu_encoder->active_device, amdgpu_encoder->devices,
                                  amdgpu_connector->devices, encoder->encoder_type);
                }
        }
        drm_connector_list_iter_end(&iter);
}

struct drm_connector *
amdgpu_get_connector_for_encoder(struct drm_encoder *encoder)
{
        struct drm_device *dev = encoder->dev;
        struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
        struct drm_connector *connector, *found = NULL;
        struct drm_connector_list_iter iter;
        struct amdgpu_connector *amdgpu_connector;

        drm_connector_list_iter_begin(dev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                amdgpu_connector = to_amdgpu_connector(connector);
                if (amdgpu_encoder->active_device & amdgpu_connector->devices) {
                        found = connector;
                        break;
                }
        }
        drm_connector_list_iter_end(&iter);
        return found;
}

struct drm_connector *
amdgpu_get_connector_for_encoder_init(struct drm_encoder *encoder)
{
        struct drm_device *dev = encoder->dev;
        struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
        struct drm_connector *connector, *found = NULL;
        struct drm_connector_list_iter iter;
        struct amdgpu_connector *amdgpu_connector;

        drm_connector_list_iter_begin(dev, &iter);
        drm_for_each_connector_iter(connector, &iter) {
                amdgpu_connector = to_amdgpu_connector(connector);
                if (amdgpu_encoder->devices & amdgpu_connector->devices) {
                        found = connector;
                        break;
                }
        }
        drm_connector_list_iter_end(&iter);
        return found;
}

struct drm_encoder *amdgpu_get_external_encoder(struct drm_encoder *encoder)
{
        struct drm_device *dev = encoder->dev;
        struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
        struct drm_encoder *other_encoder;
        struct amdgpu_encoder *other_amdgpu_encoder;

        if (amdgpu_encoder->is_ext_encoder)
                return NULL;

        list_for_each_entry(other_encoder, &dev->mode_config.encoder_list, head) {
                if (other_encoder == encoder)
                        continue;
                other_amdgpu_encoder = to_amdgpu_encoder(other_encoder);
                if (other_amdgpu_encoder->is_ext_encoder &&
                    (amdgpu_encoder->devices & other_amdgpu_encoder->devices))
                        return other_encoder;
        }
        return NULL;
}

u16 amdgpu_encoder_get_dp_bridge_encoder_id(struct drm_encoder *encoder)
{
        struct drm_encoder *other_encoder = amdgpu_get_external_encoder(encoder);

        if (other_encoder) {
                struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(other_encoder);

                switch (amdgpu_encoder->encoder_id) {
                case ENCODER_OBJECT_ID_TRAVIS:
                case ENCODER_OBJECT_ID_NUTMEG:
                        return amdgpu_encoder->encoder_id;
                default:
                        return ENCODER_OBJECT_ID_NONE;
                }
        }
        return ENCODER_OBJECT_ID_NONE;
}

void amdgpu_panel_mode_fixup(struct drm_encoder *encoder,
                             struct drm_display_mode *adjusted_mode)
{
        struct amdgpu_encoder *amdgpu_encoder = to_amdgpu_encoder(encoder);
        struct drm_display_mode *native_mode = &amdgpu_encoder->native_mode;
        unsigned hblank = native_mode->htotal - native_mode->hdisplay;
        unsigned vblank = native_mode->vtotal - native_mode->vdisplay;
        unsigned hover = native_mode->hsync_start - native_mode->hdisplay;
        unsigned vover = native_mode->vsync_start - native_mode->vdisplay;
        unsigned hsync_width = native_mode->hsync_end - native_mode->hsync_start;
        unsigned vsync_width = native_mode->vsync_end - native_mode->vsync_start;

        adjusted_mode->clock = native_mode->clock;
        adjusted_mode->flags = native_mode->flags;

        adjusted_mode->hdisplay = native_mode->hdisplay;
        adjusted_mode->vdisplay = native_mode->vdisplay;

        adjusted_mode->htotal = native_mode->hdisplay + hblank;
        adjusted_mode->hsync_start = native_mode->hdisplay + hover;
        adjusted_mode->hsync_end = adjusted_mode->hsync_start + hsync_width;

        adjusted_mode->vtotal = native_mode->vdisplay + vblank;
        adjusted_mode->vsync_start = native_mode->vdisplay + vover;
        adjusted_mode->vsync_end = adjusted_mode->vsync_start + vsync_width;

        drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);

        adjusted_mode->crtc_hdisplay = native_mode->hdisplay;
        adjusted_mode->crtc_vdisplay = native_mode->vdisplay;

        adjusted_mode->crtc_htotal = adjusted_mode->crtc_hdisplay + hblank;
        adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hdisplay + hover;
        adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_start + hsync_width;

        adjusted_mode->crtc_vtotal = adjusted_mode->crtc_vdisplay + vblank;
        adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vdisplay + vover;
        adjusted_mode->crtc_vsync_end = adjusted_mode->crtc_vsync_start + vsync_width;

}

bool amdgpu_dig_monitor_is_duallink(struct drm_encoder *encoder,
                                    u32 pixel_clock)
{
        struct drm_connector *connector;
        struct amdgpu_connector *amdgpu_connector;
        struct amdgpu_connector_atom_dig *dig_connector;

        connector = amdgpu_get_connector_for_encoder(encoder);
        /* if we don't have an active device yet, just use one of
         * the connectors tied to the encoder.
         */
        if (!connector)
                connector = amdgpu_get_connector_for_encoder_init(encoder);
        amdgpu_connector = to_amdgpu_connector(connector);

        switch (connector->connector_type) {
        case DRM_MODE_CONNECTOR_DVII:
        case DRM_MODE_CONNECTOR_HDMIB:
                if (amdgpu_connector->use_digital) {
                        /* HDMI 1.3 supports up to 340 Mhz over single link */
                        if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
                                if (pixel_clock > 340000)
                                        return true;
                                else
                                        return false;
                        } else {
                                if (pixel_clock > 165000)
                                        return true;
                                else
                                        return false;
                        }
                } else
                        return false;
        case DRM_MODE_CONNECTOR_DVID:
        case DRM_MODE_CONNECTOR_HDMIA:
        case DRM_MODE_CONNECTOR_DisplayPort:
                dig_connector = amdgpu_connector->con_priv;
                if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
                    (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP))
                        return false;
                else {
                        /* HDMI 1.3 supports up to 340 Mhz over single link */
                        if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
                                if (pixel_clock > 340000)
                                        return true;
                                else
                                        return false;
                        } else {
                                if (pixel_clock > 165000)
                                        return true;
                                else
                                        return false;
                        }
                }
        default:
                return false;
        }
}