treewide: remove redundant IS_ERR() before error code check

[linux/fpc-iii.git] / drivers / gpu / drm / vboxvideo / vbox_mode.c

// SPDX-License-Identifier: MIT
/*
 * Copyright (C) 2013-2017 Oracle Corporation
 * This file is based on ast_mode.c
 * Copyright 2012 Red Hat Inc.
 * Parts based on xf86-video-ast
 * Copyright (c) 2005 ASPEED Technology Inc.
 * Authors: Dave Airlie <airlied@redhat.com>
 *          Michael Thayer <michael.thayer@oracle.com,
 *          Hans de Goede <hdegoede@redhat.com>
 */
#include <linux/export.h>

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "hgsmi_channels.h"
#include "vbox_drv.h"
#include "vboxvideo.h"

/*
 * Set a graphics mode.  Poke any required values into registers, do an HGSMI
 * mode set and tell the host we support advanced graphics functions.
 */
static void vbox_do_modeset(struct drm_crtc *crtc)
{
        struct drm_framebuffer *fb = crtc->primary->state->fb;
        struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
        struct vbox_private *vbox;
        int width, height, bpp, pitch;
        u16 flags;
        s32 x_offset, y_offset;

        vbox = crtc->dev->dev_private;
        width = vbox_crtc->width ? vbox_crtc->width : 640;
        height = vbox_crtc->height ? vbox_crtc->height : 480;
        bpp = fb ? fb->format->cpp[0] * 8 : 32;
        pitch = fb ? fb->pitches[0] : width * bpp / 8;
        x_offset = vbox->single_framebuffer ? vbox_crtc->x : vbox_crtc->x_hint;
        y_offset = vbox->single_framebuffer ? vbox_crtc->y : vbox_crtc->y_hint;

        /*
         * This is the old way of setting graphics modes.  It assumed one screen
         * and a frame-buffer at the start of video RAM.  On older versions of
         * VirtualBox, certain parts of the code still assume that the first
         * screen is programmed this way, so try to fake it.
         */
        if (vbox_crtc->crtc_id == 0 && fb &&
            vbox_crtc->fb_offset / pitch < 0xffff - crtc->y &&
            vbox_crtc->fb_offset % (bpp / 8) == 0) {
                vbox_write_ioport(VBE_DISPI_INDEX_XRES, width);
                vbox_write_ioport(VBE_DISPI_INDEX_YRES, height);
                vbox_write_ioport(VBE_DISPI_INDEX_VIRT_WIDTH, pitch * 8 / bpp);
                vbox_write_ioport(VBE_DISPI_INDEX_BPP, bpp);
                vbox_write_ioport(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED);
                vbox_write_ioport(VBE_DISPI_INDEX_X_OFFSET,
                        vbox_crtc->fb_offset % pitch / bpp * 8 + vbox_crtc->x);
                vbox_write_ioport(VBE_DISPI_INDEX_Y_OFFSET,
                                  vbox_crtc->fb_offset / pitch + vbox_crtc->y);
        }

        flags = VBVA_SCREEN_F_ACTIVE;
        flags |= (fb && crtc->state->enable) ? 0 : VBVA_SCREEN_F_BLANK;
        flags |= vbox_crtc->disconnected ? VBVA_SCREEN_F_DISABLED : 0;
        hgsmi_process_display_info(vbox->guest_pool, vbox_crtc->crtc_id,
                                   x_offset, y_offset,
                                   vbox_crtc->x * bpp / 8 +
                                                        vbox_crtc->y * pitch,
                                   pitch, width, height, bpp, flags);
}

static int vbox_set_view(struct drm_crtc *crtc)
{
        struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
        struct vbox_private *vbox = crtc->dev->dev_private;
        struct vbva_infoview *p;

        /*
         * Tell the host about the view.  This design originally targeted the
         * Windows XP driver architecture and assumed that each screen would
         * have a dedicated frame buffer with the command buffer following it,
         * the whole being a "view".  The host works out which screen a command
         * buffer belongs to by checking whether it is in the first view, then
         * whether it is in the second and so on.  The first match wins.  We
         * cheat around this by making the first view be the managed memory
         * plus the first command buffer, the second the same plus the second
         * buffer and so on.
         */
        p = hgsmi_buffer_alloc(vbox->guest_pool, sizeof(*p),
                               HGSMI_CH_VBVA, VBVA_INFO_VIEW);
        if (!p)
                return -ENOMEM;

        p->view_index = vbox_crtc->crtc_id;
        p->view_offset = vbox_crtc->fb_offset;
        p->view_size = vbox->available_vram_size - vbox_crtc->fb_offset +
                       vbox_crtc->crtc_id * VBVA_MIN_BUFFER_SIZE;
        p->max_screen_size = vbox->available_vram_size - vbox_crtc->fb_offset;

        hgsmi_buffer_submit(vbox->guest_pool, p);
        hgsmi_buffer_free(vbox->guest_pool, p);

        return 0;
}

/*
 * Try to map the layout of virtual screens to the range of the input device.
 * Return true if we need to re-set the crtc modes due to screen offset
 * changes.
 */
static bool vbox_set_up_input_mapping(struct vbox_private *vbox)
{
        struct drm_crtc *crtci;
        struct drm_connector *connectori;
        struct drm_framebuffer *fb, *fb1 = NULL;
        bool single_framebuffer = true;
        bool old_single_framebuffer = vbox->single_framebuffer;
        u16 width = 0, height = 0;

        /*
         * Are we using an X.Org-style single large frame-buffer for all crtcs?
         * If so then screen layout can be deduced from the crtc offsets.
         * Same fall-back if this is the fbdev frame-buffer.
         */
        list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list, head) {
                fb = crtci->primary->state->fb;
                if (!fb)
                        continue;

                if (!fb1) {
                        fb1 = fb;
                        if (fb1 == vbox->ddev.fb_helper->fb)
                                break;
                } else if (fb != fb1) {
                        single_framebuffer = false;
                }
        }
        if (!fb1)
                return false;

        if (single_framebuffer) {
                vbox->single_framebuffer = true;
                vbox->input_mapping_width = fb1->width;
                vbox->input_mapping_height = fb1->height;
                return old_single_framebuffer != vbox->single_framebuffer;
        }
        /* Otherwise calculate the total span of all screens. */
        list_for_each_entry(connectori, &vbox->ddev.mode_config.connector_list,
                            head) {
                struct vbox_connector *vbox_connector =
                    to_vbox_connector(connectori);
                struct vbox_crtc *vbox_crtc = vbox_connector->vbox_crtc;

                width = max_t(u16, width, vbox_crtc->x_hint +
                                          vbox_connector->mode_hint.width);
                height = max_t(u16, height, vbox_crtc->y_hint +
                                            vbox_connector->mode_hint.height);
        }

        vbox->single_framebuffer = false;
        vbox->input_mapping_width = width;
        vbox->input_mapping_height = height;

        return old_single_framebuffer != vbox->single_framebuffer;
}

static void vbox_crtc_set_base_and_mode(struct drm_crtc *crtc,
                                        struct drm_framebuffer *fb,
                                        int x, int y)
{
        struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(fb->obj[0]);
        struct vbox_private *vbox = crtc->dev->dev_private;
        struct vbox_crtc *vbox_crtc = to_vbox_crtc(crtc);
        bool needs_modeset = drm_atomic_crtc_needs_modeset(crtc->state);

        mutex_lock(&vbox->hw_mutex);

        if (crtc->state->enable) {
                vbox_crtc->width = crtc->state->mode.hdisplay;
                vbox_crtc->height = crtc->state->mode.vdisplay;
        }

        vbox_crtc->x = x;
        vbox_crtc->y = y;
        vbox_crtc->fb_offset = drm_gem_vram_offset(gbo);

        /* vbox_do_modeset() checks vbox->single_framebuffer so update it now */
        if (needs_modeset && vbox_set_up_input_mapping(vbox)) {
                struct drm_crtc *crtci;

                list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list,
                                    head) {
                        if (crtci == crtc)
                                continue;
                        vbox_do_modeset(crtci);
                }
        }

        vbox_set_view(crtc);
        vbox_do_modeset(crtc);

        if (needs_modeset)
                hgsmi_update_input_mapping(vbox->guest_pool, 0, 0,
                                           vbox->input_mapping_width,
                                           vbox->input_mapping_height);

        mutex_unlock(&vbox->hw_mutex);
}

static void vbox_crtc_atomic_enable(struct drm_crtc *crtc,
                                    struct drm_crtc_state *old_crtc_state)
{
}

static void vbox_crtc_atomic_disable(struct drm_crtc *crtc,
                                     struct drm_crtc_state *old_crtc_state)
{
}

static void vbox_crtc_atomic_flush(struct drm_crtc *crtc,
                                   struct drm_crtc_state *old_crtc_state)
{
        struct drm_pending_vblank_event *event;
        unsigned long flags;

        if (crtc->state && crtc->state->event) {
                event = crtc->state->event;
                crtc->state->event = NULL;

                spin_lock_irqsave(&crtc->dev->event_lock, flags);
                drm_crtc_send_vblank_event(crtc, event);
                spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
        }
}

static const struct drm_crtc_helper_funcs vbox_crtc_helper_funcs = {
        .atomic_enable = vbox_crtc_atomic_enable,
        .atomic_disable = vbox_crtc_atomic_disable,
        .atomic_flush = vbox_crtc_atomic_flush,
};

static void vbox_crtc_destroy(struct drm_crtc *crtc)
{
        drm_crtc_cleanup(crtc);
        kfree(crtc);
}

static const struct drm_crtc_funcs vbox_crtc_funcs = {
        .set_config = drm_atomic_helper_set_config,
        .page_flip = drm_atomic_helper_page_flip,
        /* .gamma_set = vbox_crtc_gamma_set, */
        .destroy = vbox_crtc_destroy,
        .reset = drm_atomic_helper_crtc_reset,
        .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
};

static int vbox_primary_atomic_check(struct drm_plane *plane,
                                     struct drm_plane_state *new_state)
{
        struct drm_crtc_state *crtc_state = NULL;

        if (new_state->crtc) {
                crtc_state = drm_atomic_get_existing_crtc_state(
                                            new_state->state, new_state->crtc);
                if (WARN_ON(!crtc_state))
                        return -EINVAL;
        }

        return drm_atomic_helper_check_plane_state(new_state, crtc_state,
                                                   DRM_PLANE_HELPER_NO_SCALING,
                                                   DRM_PLANE_HELPER_NO_SCALING,
                                                   false, true);
}

static void vbox_primary_atomic_update(struct drm_plane *plane,
                                       struct drm_plane_state *old_state)
{
        struct drm_crtc *crtc = plane->state->crtc;
        struct drm_framebuffer *fb = plane->state->fb;
        struct vbox_private *vbox = fb->dev->dev_private;
        struct drm_mode_rect *clips;
        uint32_t num_clips, i;

        vbox_crtc_set_base_and_mode(crtc, fb,
                                    plane->state->src_x >> 16,
                                    plane->state->src_y >> 16);

        /* Send information about dirty rectangles to VBVA. */

        clips = drm_plane_get_damage_clips(plane->state);
        num_clips = drm_plane_get_damage_clips_count(plane->state);

        if (!num_clips)
                return;

        mutex_lock(&vbox->hw_mutex);

        for (i = 0; i < num_clips; ++i, ++clips) {
                struct vbva_cmd_hdr cmd_hdr;
                unsigned int crtc_id = to_vbox_crtc(crtc)->crtc_id;

                cmd_hdr.x = (s16)clips->x1;
                cmd_hdr.y = (s16)clips->y1;
                cmd_hdr.w = (u16)clips->x2 - clips->x1;
                cmd_hdr.h = (u16)clips->y2 - clips->y1;

                if (!vbva_buffer_begin_update(&vbox->vbva_info[crtc_id],
                                              vbox->guest_pool))
                        continue;

                vbva_write(&vbox->vbva_info[crtc_id], vbox->guest_pool,
                           &cmd_hdr, sizeof(cmd_hdr));
                vbva_buffer_end_update(&vbox->vbva_info[crtc_id]);
        }

        mutex_unlock(&vbox->hw_mutex);
}

static void vbox_primary_atomic_disable(struct drm_plane *plane,
                                        struct drm_plane_state *old_state)
{
        struct drm_crtc *crtc = old_state->crtc;

        /* vbox_do_modeset checks plane->state->fb and will disable if NULL */
        vbox_crtc_set_base_and_mode(crtc, old_state->fb,
                                    old_state->src_x >> 16,
                                    old_state->src_y >> 16);
}

static int vbox_cursor_atomic_check(struct drm_plane *plane,
                                    struct drm_plane_state *new_state)
{
        struct drm_crtc_state *crtc_state = NULL;
        u32 width = new_state->crtc_w;
        u32 height = new_state->crtc_h;
        int ret;

        if (new_state->crtc) {
                crtc_state = drm_atomic_get_existing_crtc_state(
                                            new_state->state, new_state->crtc);
                if (WARN_ON(!crtc_state))
                        return -EINVAL;
        }

        ret = drm_atomic_helper_check_plane_state(new_state, crtc_state,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  DRM_PLANE_HELPER_NO_SCALING,
                                                  true, true);
        if (ret)
                return ret;

        if (!new_state->fb)
                return 0;

        if (width > VBOX_MAX_CURSOR_WIDTH || height > VBOX_MAX_CURSOR_HEIGHT ||
            width == 0 || height == 0)
                return -EINVAL;

        return 0;
}

/*
 * Copy the ARGB image and generate the mask, which is needed in case the host
 * does not support ARGB cursors.  The mask is a 1BPP bitmap with the bit set
 * if the corresponding alpha value in the ARGB image is greater than 0xF0.
 */
static void copy_cursor_image(u8 *src, u8 *dst, u32 width, u32 height,
                              size_t mask_size)
{
        size_t line_size = (width + 7) / 8;
        u32 i, j;

        memcpy(dst + mask_size, src, width * height * 4);
        for (i = 0; i < height; ++i)
                for (j = 0; j < width; ++j)
                        if (((u32 *)src)[i * width + j] > 0xf0000000)
                                dst[i * line_size + j / 8] |= (0x80 >> (j % 8));
}

static void vbox_cursor_atomic_update(struct drm_plane *plane,
                                      struct drm_plane_state *old_state)
{
        struct vbox_private *vbox =
                container_of(plane->dev, struct vbox_private, ddev);
        struct vbox_crtc *vbox_crtc = to_vbox_crtc(plane->state->crtc);
        struct drm_framebuffer *fb = plane->state->fb;
        struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(fb->obj[0]);
        u32 width = plane->state->crtc_w;
        u32 height = plane->state->crtc_h;
        size_t data_size, mask_size;
        u32 flags;
        u8 *src;

        /*
         * VirtualBox uses the host windowing system to draw the cursor so
         * moves are a no-op, we only need to upload new cursor sprites.
         */
        if (fb == old_state->fb)
                return;

        mutex_lock(&vbox->hw_mutex);

        vbox_crtc->cursor_enabled = true;

        /* pinning is done in prepare/cleanup framebuffer */
        src = drm_gem_vram_kmap(gbo, true, NULL);
        if (IS_ERR(src)) {
                mutex_unlock(&vbox->hw_mutex);
                DRM_WARN("Could not kmap cursor bo, skipping update\n");
                return;
        }

        /*
         * The mask must be calculated based on the alpha
         * channel, one bit per ARGB word, and must be 32-bit
         * padded.
         */
        mask_size = ((width + 7) / 8 * height + 3) & ~3;
        data_size = width * height * 4 + mask_size;

        copy_cursor_image(src, vbox->cursor_data, width, height, mask_size);
        drm_gem_vram_kunmap(gbo);

        flags = VBOX_MOUSE_POINTER_VISIBLE | VBOX_MOUSE_POINTER_SHAPE |
                VBOX_MOUSE_POINTER_ALPHA;
        hgsmi_update_pointer_shape(vbox->guest_pool, flags,
                                   min_t(u32, max(fb->hot_x, 0), width),
                                   min_t(u32, max(fb->hot_y, 0), height),
                                   width, height, vbox->cursor_data, data_size);

        mutex_unlock(&vbox->hw_mutex);
}

static void vbox_cursor_atomic_disable(struct drm_plane *plane,
                                       struct drm_plane_state *old_state)
{
        struct vbox_private *vbox =
                container_of(plane->dev, struct vbox_private, ddev);
        struct vbox_crtc *vbox_crtc = to_vbox_crtc(old_state->crtc);
        bool cursor_enabled = false;
        struct drm_crtc *crtci;

        mutex_lock(&vbox->hw_mutex);

        vbox_crtc->cursor_enabled = false;

        list_for_each_entry(crtci, &vbox->ddev.mode_config.crtc_list, head) {
                if (to_vbox_crtc(crtci)->cursor_enabled)
                        cursor_enabled = true;
        }

        if (!cursor_enabled)
                hgsmi_update_pointer_shape(vbox->guest_pool, 0, 0, 0,
                                           0, 0, NULL, 0);

        mutex_unlock(&vbox->hw_mutex);
}

static const u32 vbox_cursor_plane_formats[] = {
        DRM_FORMAT_ARGB8888,
};

static const struct drm_plane_helper_funcs vbox_cursor_helper_funcs = {
        .atomic_check   = vbox_cursor_atomic_check,
        .atomic_update  = vbox_cursor_atomic_update,
        .atomic_disable = vbox_cursor_atomic_disable,
        .prepare_fb     = drm_gem_vram_plane_helper_prepare_fb,
        .cleanup_fb     = drm_gem_vram_plane_helper_cleanup_fb,
};

static const struct drm_plane_funcs vbox_cursor_plane_funcs = {
        .update_plane   = drm_atomic_helper_update_plane,
        .disable_plane  = drm_atomic_helper_disable_plane,
        .destroy        = drm_primary_helper_destroy,
        .reset          = drm_atomic_helper_plane_reset,
        .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};

static const u32 vbox_primary_plane_formats[] = {
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_ARGB8888,
};

static const struct drm_plane_helper_funcs vbox_primary_helper_funcs = {
        .atomic_check = vbox_primary_atomic_check,
        .atomic_update = vbox_primary_atomic_update,
        .atomic_disable = vbox_primary_atomic_disable,
        .prepare_fb     = drm_gem_vram_plane_helper_prepare_fb,
        .cleanup_fb     = drm_gem_vram_plane_helper_cleanup_fb,
};

static const struct drm_plane_funcs vbox_primary_plane_funcs = {
        .update_plane   = drm_atomic_helper_update_plane,
        .disable_plane  = drm_atomic_helper_disable_plane,
        .destroy        = drm_primary_helper_destroy,
        .reset          = drm_atomic_helper_plane_reset,
        .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};

static struct drm_plane *vbox_create_plane(struct vbox_private *vbox,
                                           unsigned int possible_crtcs,
                                           enum drm_plane_type type)
{
        const struct drm_plane_helper_funcs *helper_funcs = NULL;
        const struct drm_plane_funcs *funcs;
        struct drm_plane *plane;
        const u32 *formats;
        int num_formats;
        int err;

        if (type == DRM_PLANE_TYPE_PRIMARY) {
                funcs = &vbox_primary_plane_funcs;
                formats = vbox_primary_plane_formats;
                helper_funcs = &vbox_primary_helper_funcs;
                num_formats = ARRAY_SIZE(vbox_primary_plane_formats);
        } else if (type == DRM_PLANE_TYPE_CURSOR) {
                funcs = &vbox_cursor_plane_funcs;
                formats = vbox_cursor_plane_formats;
                helper_funcs = &vbox_cursor_helper_funcs;
                num_formats = ARRAY_SIZE(vbox_cursor_plane_formats);
        } else {
                return ERR_PTR(-EINVAL);
        }

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

        err = drm_universal_plane_init(&vbox->ddev, plane, possible_crtcs,
                                       funcs, formats, num_formats,
                                       NULL, type, NULL);
        if (err)
                goto free_plane;

        drm_plane_helper_add(plane, helper_funcs);

        return plane;

free_plane:
        kfree(plane);
        return ERR_PTR(-EINVAL);
}

static struct vbox_crtc *vbox_crtc_init(struct drm_device *dev, unsigned int i)
{
        struct vbox_private *vbox =
                container_of(dev, struct vbox_private, ddev);
        struct drm_plane *cursor = NULL;
        struct vbox_crtc *vbox_crtc;
        struct drm_plane *primary;
        u32 caps = 0;
        int ret;

        ret = hgsmi_query_conf(vbox->guest_pool,
                               VBOX_VBVA_CONF32_CURSOR_CAPABILITIES, &caps);
        if (ret)
                return ERR_PTR(ret);

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

        primary = vbox_create_plane(vbox, 1 << i, DRM_PLANE_TYPE_PRIMARY);
        if (IS_ERR(primary)) {
                ret = PTR_ERR(primary);
                goto free_mem;
        }

        if ((caps & VBOX_VBVA_CURSOR_CAPABILITY_HARDWARE)) {
                cursor = vbox_create_plane(vbox, 1 << i, DRM_PLANE_TYPE_CURSOR);
                if (IS_ERR(cursor)) {
                        ret = PTR_ERR(cursor);
                        goto clean_primary;
                }
        } else {
                DRM_WARN("VirtualBox host is too old, no cursor support\n");
        }

        vbox_crtc->crtc_id = i;

        ret = drm_crtc_init_with_planes(dev, &vbox_crtc->base, primary, cursor,
                                        &vbox_crtc_funcs, NULL);
        if (ret)
                goto clean_cursor;

        drm_mode_crtc_set_gamma_size(&vbox_crtc->base, 256);
        drm_crtc_helper_add(&vbox_crtc->base, &vbox_crtc_helper_funcs);

        return vbox_crtc;

clean_cursor:
        if (cursor) {
                drm_plane_cleanup(cursor);
                kfree(cursor);
        }
clean_primary:
        drm_plane_cleanup(primary);
        kfree(primary);
free_mem:
        kfree(vbox_crtc);
        return ERR_PTR(ret);
}

static void vbox_encoder_destroy(struct drm_encoder *encoder)
{
        drm_encoder_cleanup(encoder);
        kfree(encoder);
}

static const struct drm_encoder_funcs vbox_enc_funcs = {
        .destroy = vbox_encoder_destroy,
};

static struct drm_encoder *vbox_encoder_init(struct drm_device *dev,
                                             unsigned int i)
{
        struct vbox_encoder *vbox_encoder;

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

        drm_encoder_init(dev, &vbox_encoder->base, &vbox_enc_funcs,
                         DRM_MODE_ENCODER_DAC, NULL);

        vbox_encoder->base.possible_crtcs = 1 << i;
        return &vbox_encoder->base;
}

/*
 * Generate EDID data with a mode-unique serial number for the virtual
 * monitor to try to persuade Unity that different modes correspond to
 * different monitors and it should not try to force the same resolution on
 * them.
 */
static void vbox_set_edid(struct drm_connector *connector, int width,
                          int height)
{
        enum { EDID_SIZE = 128 };
        unsigned char edid[EDID_SIZE] = {
                0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, /* header */
                0x58, 0x58,     /* manufacturer (VBX) */
                0x00, 0x00,     /* product code */
                0x00, 0x00, 0x00, 0x00, /* serial number goes here */
                0x01,           /* week of manufacture */
                0x00,           /* year of manufacture */
                0x01, 0x03,     /* EDID version */
                0x80,           /* capabilities - digital */
                0x00,           /* horiz. res in cm, zero for projectors */
                0x00,           /* vert. res in cm */
                0x78,           /* display gamma (120 == 2.2). */
                0xEE,           /* features (standby, suspend, off, RGB, std */
                                /* colour space, preferred timing mode) */
                0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26, 0x0F, 0x50, 0x54,
                /* chromaticity for standard colour space. */
                0x00, 0x00, 0x00,       /* no default timings */
                0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
                    0x01, 0x01,
                0x01, 0x01, 0x01, 0x01, /* no standard timings */
                0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x06, 0x00, 0x02, 0x02,
                    0x02, 0x02,
                /* descriptor block 1 goes below */
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                /* descriptor block 2, monitor ranges */
                0x00, 0x00, 0x00, 0xFD, 0x00,
                0x00, 0xC8, 0x00, 0xC8, 0x64, 0x00, 0x0A, 0x20, 0x20, 0x20,
                    0x20, 0x20,
                /* 0-200Hz vertical, 0-200KHz horizontal, 1000MHz pixel clock */
                0x20,
                /* descriptor block 3, monitor name */
                0x00, 0x00, 0x00, 0xFC, 0x00,
                'V', 'B', 'O', 'X', ' ', 'm', 'o', 'n', 'i', 't', 'o', 'r',
                '\n',
                /* descriptor block 4: dummy data */
                0x00, 0x00, 0x00, 0x10, 0x00,
                0x0A, 0x20, 0x20, 0x20, 0x20, 0x20,
                0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
                0x20,
                0x00,           /* number of extensions */
                0x00            /* checksum goes here */
        };
        int clock = (width + 6) * (height + 6) * 60 / 10000;
        unsigned int i, sum = 0;

        edid[12] = width & 0xff;
        edid[13] = width >> 8;
        edid[14] = height & 0xff;
        edid[15] = height >> 8;
        edid[54] = clock & 0xff;
        edid[55] = clock >> 8;
        edid[56] = width & 0xff;
        edid[58] = (width >> 4) & 0xf0;
        edid[59] = height & 0xff;
        edid[61] = (height >> 4) & 0xf0;
        for (i = 0; i < EDID_SIZE - 1; ++i)
                sum += edid[i];
        edid[EDID_SIZE - 1] = (0x100 - (sum & 0xFF)) & 0xFF;
        drm_connector_update_edid_property(connector, (struct edid *)edid);
}

static int vbox_get_modes(struct drm_connector *connector)
{
        struct vbox_connector *vbox_connector = NULL;
        struct drm_display_mode *mode = NULL;
        struct vbox_private *vbox = NULL;
        unsigned int num_modes = 0;
        int preferred_width, preferred_height;

        vbox_connector = to_vbox_connector(connector);
        vbox = connector->dev->dev_private;

        hgsmi_report_flags_location(vbox->guest_pool, GUEST_HEAP_OFFSET(vbox) +
                                    HOST_FLAGS_OFFSET);
        if (vbox_connector->vbox_crtc->crtc_id == 0)
                vbox_report_caps(vbox);

        num_modes = drm_add_modes_noedid(connector, 2560, 1600);
        preferred_width = vbox_connector->mode_hint.width ?
                          vbox_connector->mode_hint.width : 1024;
        preferred_height = vbox_connector->mode_hint.height ?
                           vbox_connector->mode_hint.height : 768;
        mode = drm_cvt_mode(connector->dev, preferred_width, preferred_height,
                            60, false, false, false);
        if (mode) {
                mode->type |= DRM_MODE_TYPE_PREFERRED;
                drm_mode_probed_add(connector, mode);
                ++num_modes;
        }
        vbox_set_edid(connector, preferred_width, preferred_height);

        if (vbox_connector->vbox_crtc->x_hint != -1)
                drm_object_property_set_value(&connector->base,
                        vbox->ddev.mode_config.suggested_x_property,
                        vbox_connector->vbox_crtc->x_hint);
        else
                drm_object_property_set_value(&connector->base,
                        vbox->ddev.mode_config.suggested_x_property, 0);

        if (vbox_connector->vbox_crtc->y_hint != -1)
                drm_object_property_set_value(&connector->base,
                        vbox->ddev.mode_config.suggested_y_property,
                        vbox_connector->vbox_crtc->y_hint);
        else
                drm_object_property_set_value(&connector->base,
                        vbox->ddev.mode_config.suggested_y_property, 0);

        return num_modes;
}

static void vbox_connector_destroy(struct drm_connector *connector)
{
        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
        kfree(connector);
}

static enum drm_connector_status
vbox_connector_detect(struct drm_connector *connector, bool force)
{
        struct vbox_connector *vbox_connector;

        vbox_connector = to_vbox_connector(connector);

        return vbox_connector->mode_hint.disconnected ?
            connector_status_disconnected : connector_status_connected;
}

static int vbox_fill_modes(struct drm_connector *connector, u32 max_x,
                           u32 max_y)
{
        struct vbox_connector *vbox_connector;
        struct drm_device *dev;
        struct drm_display_mode *mode, *iterator;

        vbox_connector = to_vbox_connector(connector);
        dev = vbox_connector->base.dev;
        list_for_each_entry_safe(mode, iterator, &connector->modes, head) {
                list_del(&mode->head);
                drm_mode_destroy(dev, mode);
        }

        return drm_helper_probe_single_connector_modes(connector, max_x, max_y);
}

static const struct drm_connector_helper_funcs vbox_connector_helper_funcs = {
        .get_modes = vbox_get_modes,
};

static const struct drm_connector_funcs vbox_connector_funcs = {
        .detect = vbox_connector_detect,
        .fill_modes = vbox_fill_modes,
        .destroy = vbox_connector_destroy,
        .reset = drm_atomic_helper_connector_reset,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int vbox_connector_init(struct drm_device *dev,
                               struct vbox_crtc *vbox_crtc,
                               struct drm_encoder *encoder)
{
        struct vbox_connector *vbox_connector;
        struct drm_connector *connector;

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

        connector = &vbox_connector->base;
        vbox_connector->vbox_crtc = vbox_crtc;

        drm_connector_init(dev, connector, &vbox_connector_funcs,
                           DRM_MODE_CONNECTOR_VGA);
        drm_connector_helper_add(connector, &vbox_connector_helper_funcs);

        connector->interlace_allowed = 0;
        connector->doublescan_allowed = 0;

        drm_mode_create_suggested_offset_properties(dev);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_x_property, 0);
        drm_object_attach_property(&connector->base,
                                   dev->mode_config.suggested_y_property, 0);

        drm_connector_attach_encoder(connector, encoder);

        return 0;
}

static const struct drm_mode_config_funcs vbox_mode_funcs = {
        .fb_create = drm_gem_fb_create_with_dirty,
        .atomic_check = drm_atomic_helper_check,
        .atomic_commit = drm_atomic_helper_commit,
};

int vbox_mode_init(struct vbox_private *vbox)
{
        struct drm_device *dev = &vbox->ddev;
        struct drm_encoder *encoder;
        struct vbox_crtc *vbox_crtc;
        unsigned int i;
        int ret;

        drm_mode_config_init(dev);

        dev->mode_config.funcs = (void *)&vbox_mode_funcs;
        dev->mode_config.min_width = 0;
        dev->mode_config.min_height = 0;
        dev->mode_config.preferred_depth = 24;
        dev->mode_config.max_width = VBE_DISPI_MAX_XRES;
        dev->mode_config.max_height = VBE_DISPI_MAX_YRES;

        for (i = 0; i < vbox->num_crtcs; ++i) {
                vbox_crtc = vbox_crtc_init(dev, i);
                if (IS_ERR(vbox_crtc)) {
                        ret = PTR_ERR(vbox_crtc);
                        goto err_drm_mode_cleanup;
                }
                encoder = vbox_encoder_init(dev, i);
                if (!encoder) {
                        ret = -ENOMEM;
                        goto err_drm_mode_cleanup;
                }
                ret = vbox_connector_init(dev, vbox_crtc, encoder);
                if (ret)
                        goto err_drm_mode_cleanup;
        }

        drm_mode_config_reset(dev);
        return 0;

err_drm_mode_cleanup:
        drm_mode_config_cleanup(dev);
        return ret;
}

void vbox_mode_fini(struct vbox_private *vbox)
{
        drm_mode_config_cleanup(&vbox->ddev);
}