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_probe_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 }
115