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