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_fourcc.h>
14#include <drm/drm_probe_helper.h>
15
16#include <video/videomode.h>
17
18#include "xen_drm_front.h"
19#include "xen_drm_front_conn.h"
20#include "xen_drm_front_kms.h"
21
22static struct xen_drm_front_drm_pipeline *
23to_xen_drm_pipeline(struct drm_connector *connector)
24{
25 return container_of(connector, struct xen_drm_front_drm_pipeline, conn);
26}
27
28static const u32 plane_formats[] = {
29 DRM_FORMAT_RGB565,
30 DRM_FORMAT_RGB888,
31 DRM_FORMAT_XRGB8888,
32 DRM_FORMAT_ARGB8888,
33 DRM_FORMAT_XRGB4444,
34 DRM_FORMAT_ARGB4444,
35 DRM_FORMAT_XRGB1555,
36 DRM_FORMAT_ARGB1555,
37 DRM_FORMAT_YUYV,
38};
39
40const u32 *xen_drm_front_conn_get_formats(int *format_count)
41{
42 *format_count = ARRAY_SIZE(plane_formats);
43 return plane_formats;
44}
45
46static int connector_detect(struct drm_connector *connector,
47 struct drm_modeset_acquire_ctx *ctx,
48 bool force)
49{
50 struct xen_drm_front_drm_pipeline *pipeline =
51 to_xen_drm_pipeline(connector);
52
53 if (drm_dev_is_unplugged(dev: connector->dev))
54 pipeline->conn_connected = false;
55
56 return pipeline->conn_connected ? connector_status_connected :
57 connector_status_disconnected;
58}
59
60#define XEN_DRM_CRTC_VREFRESH_HZ 60
61
62static int connector_get_modes(struct drm_connector *connector)
63{
64 struct xen_drm_front_drm_pipeline *pipeline =
65 to_xen_drm_pipeline(connector);
66 struct drm_display_mode *mode;
67 struct videomode videomode;
68 int width, height;
69
70 mode = drm_mode_create(dev: connector->dev);
71 if (!mode)
72 return 0;
73
74 memset(&videomode, 0, sizeof(videomode));
75 videomode.hactive = pipeline->width;
76 videomode.vactive = pipeline->height;
77 width = videomode.hactive + videomode.hfront_porch +
78 videomode.hback_porch + videomode.hsync_len;
79 height = videomode.vactive + videomode.vfront_porch +
80 videomode.vback_porch + videomode.vsync_len;
81 videomode.pixelclock = width * height * XEN_DRM_CRTC_VREFRESH_HZ;
82 mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
83
84 drm_display_mode_from_videomode(vm: &videomode, dmode: mode);
85 drm_mode_probed_add(connector, mode);
86 return 1;
87}
88
89static const struct drm_connector_helper_funcs connector_helper_funcs = {
90 .get_modes = connector_get_modes,
91 .detect_ctx = connector_detect,
92};
93
94static const struct drm_connector_funcs connector_funcs = {
95 .fill_modes = drm_helper_probe_single_connector_modes,
96 .destroy = drm_connector_cleanup,
97 .reset = drm_atomic_helper_connector_reset,
98 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
99 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
100};
101
102int xen_drm_front_conn_init(struct xen_drm_front_drm_info *drm_info,
103 struct drm_connector *connector)
104{
105 struct xen_drm_front_drm_pipeline *pipeline =
106 to_xen_drm_pipeline(connector);
107
108 drm_connector_helper_add(connector, funcs: &connector_helper_funcs);
109
110 pipeline->conn_connected = true;
111
112 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
113 DRM_CONNECTOR_POLL_DISCONNECT;
114
115 return drm_connector_init(dev: drm_info->drm_dev, connector,
116 funcs: &connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
117}
118

source code of linux/drivers/gpu/drm/xen/xen_drm_front_conn.c