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 };
  37
  38 const u32 *xen_drm_front_conn_get_formats(int *format_count)
  39 {
  40         *format_count = ARRAY_SIZE(plane_formats);
  41         return plane_formats;
  42 }
  43
  44 static int connector_detect(struct drm_connector *connector,
  45                             struct drm_modeset_acquire_ctx *ctx,
  46                             bool force)
  47 {
  48         struct xen_drm_front_drm_pipeline *pipeline =
  49                         to_xen_drm_pipeline(connector);
  50
  51         if (drm_dev_is_unplugged(connector->dev))
  52                 pipeline->conn_connected = false;
  53
  54         return pipeline->conn_connected ? connector_status_connected :
  55                         connector_status_disconnected;
  56 }
  57
  58 #define XEN_DRM_CRTC_VREFRESH_HZ        60
  59
  60 static int connector_get_modes(struct drm_connector *connector)
  61 {
  62         struct xen_drm_front_drm_pipeline *pipeline =
  63                         to_xen_drm_pipeline(connector);
  64         struct drm_display_mode *mode;
  65         struct videomode videomode;
  66         int width, height;
  67
  68         mode = drm_mode_create(connector->dev);
  69         if (!mode)
  70                 return 0;
  71
  72         memset(&videomode, 0, sizeof(videomode));
  73         videomode.hactive = pipeline->width;
  74         videomode.vactive = pipeline->height;
  75         width = videomode.hactive + videomode.hfront_porch +
  76                         videomode.hback_porch + videomode.hsync_len;
  77         height = videomode.vactive + videomode.vfront_porch +
  78                         videomode.vback_porch + videomode.vsync_len;
  79         videomode.pixelclock = width * height * XEN_DRM_CRTC_VREFRESH_HZ;
  80         mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
  81
  82         drm_display_mode_from_videomode(&videomode, mode);
  83         drm_mode_probed_add(connector, mode);
  84         return 1;
  85 }
  86
  87 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  88         .get_modes = connector_get_modes,
  89         .detect_ctx = connector_detect,
  90 };
  91
  92 static const struct drm_connector_funcs connector_funcs = {
  93         .fill_modes = drm_helper_probe_single_connector_modes,
  94         .destroy = drm_connector_cleanup,
  95         .reset = drm_atomic_helper_connector_reset,
  96         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  97         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  98 };
  99
 100 int xen_drm_front_conn_init(struct xen_drm_front_drm_info *drm_info,
 101                             struct drm_connector *connector)
 102 {
 103         struct xen_drm_front_drm_pipeline *pipeline =
 104                         to_xen_drm_pipeline(connector);
 105
 106         drm_connector_helper_add(connector, &connector_helper_funcs);
 107
 108         pipeline->conn_connected = true;
 109
 110         connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 111                         DRM_CONNECTOR_POLL_DISCONNECT;
 112
 113         return drm_connector_init(drm_info->drm_dev, connector,
 114                                   &connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 115 }