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 
22 static struct xen_drm_front_drm_pipeline *
23 to_xen_drm_pipeline(struct drm_connector *connector)
24 {
25 	return container_of(connector, struct xen_drm_front_drm_pipeline, conn);
26 }
27 
28 static 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 
40 const u32 *xen_drm_front_conn_get_formats(int *format_count)
41 {
42 	*format_count = ARRAY_SIZE(plane_formats);
43 	return plane_formats;
44 }
45 
46 static 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(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 
62 static 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(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(&videomode, mode);
85 	drm_mode_probed_add(connector, mode);
86 	return 1;
87 }
88 
89 static const struct drm_connector_helper_funcs connector_helper_funcs = {
90 	.get_modes = connector_get_modes,
91 	.detect_ctx = connector_detect,
92 };
93 
94 static 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 
102 int 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, &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(drm_info->drm_dev, connector,
116 				  &connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
117 }
118