drivers/gpu/drm/xen/xen_drm_front_conn.c

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2
   3 /*
   4  *  Xen para-virtual DRM device
   5  *
   6  * Copyright (C) 2016-2018 EPAM Systems Inc.
   7  *
   8  * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
   9  */
  10
  11 #include <drm/drm_atomic_helper.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_probe_helper.h>
  14
  15 #include <video/videomode.h>
  16
  17 #include "xen_drm_front.h"
  18 #include "xen_drm_front_conn.h"
  19 #include "xen_drm_front_kms.h"
  20
  21 static struct xen_drm_front_drm_pipeline *
  22 to_xen_drm_pipeline(struct drm_connector *connector)
  23 {
  24         return container_of(connector, struct xen_drm_front_drm_pipeline, conn);
  25 }
  26
  27 static const u32 plane_formats[] = {
  28         DRM_FORMAT_RGB565,
  29         DRM_FORMAT_RGB888,
  30         DRM_FORMAT_XRGB8888,
  31         DRM_FORMAT_ARGB8888,
  32         DRM_FORMAT_XRGB4444,
  33         DRM_FORMAT_ARGB4444,
  34         DRM_FORMAT_XRGB1555,
  35         DRM_FORMAT_ARGB1555,
  36         DRM_FORMAT_YUYV,
  37 };
  38
  39 const u32 *xen_drm_front_conn_get_formats(int *format_count)
  40 {
  41         *format_count = ARRAY_SIZE(plane_formats);
  42         return plane_formats;
  43 }
  44
  45 static int connector_detect(struct drm_connector *connector,
  46                             struct drm_modeset_acquire_ctx *ctx,
  47                             bool force)
  48 {
  49         struct xen_drm_front_drm_pipeline *pipeline =
  50                         to_xen_drm_pipeline(connector);
  51
  52         if (drm_dev_is_unplugged(connector->dev))
  53                 pipeline->conn_connected = false;
  54
  55         return pipeline->conn_connected ? connector_status_connected :
  56                         connector_status_disconnected;
  57 }
  58
  59 #define XEN_DRM_CRTC_VREFRESH_HZ        60
  60
  61 static int connector_get_modes(struct drm_connector *connector)
  62 {
  63         struct xen_drm_front_drm_pipeline *pipeline =
  64                         to_xen_drm_pipeline(connector);
  65         struct drm_display_mode *mode;
  66         struct videomode videomode;
  67         int width, height;
  68
  69         mode = drm_mode_create(connector->dev);
  70         if (!mode)
  71                 return 0;
  72
  73         memset(&videomode, 0, sizeof(videomode));
  74         videomode.hactive = pipeline->width;
  75         videomode.vactive = pipeline->height;
  76         width = videomode.hactive + videomode.hfront_porch +
  77                         videomode.hback_porch + videomode.hsync_len;
  78         height = videomode.vactive + videomode.vfront_porch +
  79                         videomode.vback_porch + videomode.vsync_len;
  80         videomode.pixelclock = width * height * XEN_DRM_CRTC_VREFRESH_HZ;
  81         mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
  82
  83         drm_display_mode_from_videomode(&videomode, mode);
  84         drm_mode_probed_add(connector, mode);
  85         return 1;
  86 }
  87
  88 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  89         .get_modes = connector_get_modes,
  90         .detect_ctx = connector_detect,
  91 };
  92
  93 static const struct drm_connector_funcs connector_funcs = {
  94         .fill_modes = drm_helper_probe_single_connector_modes,
  95         .destroy = drm_connector_cleanup,
  96         .reset = drm_atomic_helper_connector_reset,
  97         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  98         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  99 };
 100
 101 int xen_drm_front_conn_init(struct xen_drm_front_drm_info *drm_info,
 102                             struct drm_connector *connector)
 103 {
 104         struct xen_drm_front_drm_pipeline *pipeline =
 105                         to_xen_drm_pipeline(connector);
 106
 107         drm_connector_helper_add(connector, &connector_helper_funcs);
 108
 109         pipeline->conn_connected = true;
 110
 111         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 112                         DRM_CONNECTOR_POLL_DISCONNECT;
 113
 114         return drm_connector_init(drm_info->drm_dev, connector,
 115                                   &connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 116 }