tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * ARC PGU DRM driver.
3 *
4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#include <drm/drm_crtc_helper.h>
18#include <drm/drm_atomic_helper.h>
19
20#include "arcpgu.h"
21
22#define XRES_DEF 640
23#define YRES_DEF 480
24
25#define XRES_MAX 8192
26#define YRES_MAX 8192
27
28
29struct arcpgu_drm_connector {
30 struct drm_connector connector;
31};
32
33static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
34{
35 int count;
36
37 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
38 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
39 return count;
40}
41
42static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
43{
44 drm_connector_unregister(connector);
45 drm_connector_cleanup(connector);
46}
47
48static const struct drm_connector_helper_funcs
49arcpgu_drm_connector_helper_funcs = {
50 .get_modes = arcpgu_drm_connector_get_modes,
51};
52
53static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
54 .dpms = drm_helper_connector_dpms,
55 .reset = drm_atomic_helper_connector_reset,
56 .fill_modes = drm_helper_probe_single_connector_modes,
57 .destroy = arcpgu_drm_connector_destroy,
58 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
59 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
60};
61
62static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
63 .destroy = drm_encoder_cleanup,
64};
65
66int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
67{
68 struct arcpgu_drm_connector *arcpgu_connector;
69 struct drm_encoder *encoder;
70 struct drm_connector *connector;
71 int ret;
72
73 encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
74 if (encoder == NULL)
75 return -ENOMEM;
76
77 encoder->possible_crtcs = 1;
78 encoder->possible_clones = 0;
79
80 ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
81 DRM_MODE_ENCODER_VIRTUAL, NULL);
82 if (ret)
83 return ret;
84
85 arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
86 GFP_KERNEL);
87 if (!arcpgu_connector) {
88 ret = -ENOMEM;
89 goto error_encoder_cleanup;
90 }
91
92 connector = &arcpgu_connector->connector;
93 drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
94
95 ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
96 DRM_MODE_CONNECTOR_VIRTUAL);
97 if (ret < 0) {
98 dev_err(drm->dev, "failed to initialize drm connector\n");
99 goto error_encoder_cleanup;
100 }
101
102 ret = drm_connector_attach_encoder(connector, encoder);
103 if (ret < 0) {
104 dev_err(drm->dev, "could not attach connector to encoder\n");
105 drm_connector_unregister(connector);
106 goto error_connector_cleanup;
107 }
108
109 return 0;
110
111error_connector_cleanup:
112 drm_connector_cleanup(connector);
113
114error_encoder_cleanup:
115 drm_encoder_cleanup(encoder);
116 return ret;
117}