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_encoder_slave.h>
19#include <drm/drm_atomic_helper.h>
20
21#include "arcpgu.h"
22
23#define XRES_DEF 640
24#define YRES_DEF 480
25
26#define XRES_MAX 8192
27#define YRES_MAX 8192
28
29
30struct arcpgu_drm_connector {
31 struct drm_connector connector;
32 struct drm_encoder_slave *encoder_slave;
33};
34
35static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
36{
37 int count;
38
39 count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
40 drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
41 return count;
42}
43
44static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
45{
46 drm_connector_unregister(connector);
47 drm_connector_cleanup(connector);
48}
49
50static const struct drm_connector_helper_funcs
51arcpgu_drm_connector_helper_funcs = {
52 .get_modes = arcpgu_drm_connector_get_modes,
53};
54
55static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
56 .dpms = drm_helper_connector_dpms,
57 .reset = drm_atomic_helper_connector_reset,
58 .fill_modes = drm_helper_probe_single_connector_modes,
59 .destroy = arcpgu_drm_connector_destroy,
60 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
61 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
62};
63
64static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
65 .destroy = drm_encoder_cleanup,
66};
67
68int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
69{
70 struct arcpgu_drm_connector *arcpgu_connector;
71 struct drm_encoder_slave *encoder;
72 struct drm_connector *connector;
73 int ret;
74
75 encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
76 if (encoder == NULL)
77 return -ENOMEM;
78
79 encoder->base.possible_crtcs = 1;
80 encoder->base.possible_clones = 0;
81
82 ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
83 DRM_MODE_ENCODER_VIRTUAL, NULL);
84 if (ret)
85 return ret;
86
87 arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
88 GFP_KERNEL);
89 if (!arcpgu_connector) {
90 ret = -ENOMEM;
91 goto error_encoder_cleanup;
92 }
93
94 connector = &arcpgu_connector->connector;
95 drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
96
97 ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
98 DRM_MODE_CONNECTOR_VIRTUAL);
99 if (ret < 0) {
100 dev_err(drm->dev, "failed to initialize drm connector\n");
101 goto error_encoder_cleanup;
102 }
103
104 ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
105 if (ret < 0) {
106 dev_err(drm->dev, "could not attach connector to encoder\n");
107 drm_connector_unregister(connector);
108 goto error_connector_cleanup;
109 }
110
111 arcpgu_connector->encoder_slave = encoder;
112
113 return 0;
114
115error_connector_cleanup:
116 drm_connector_cleanup(connector);
117
118error_encoder_cleanup:
119 drm_encoder_cleanup(&encoder->base);
120 return ret;
121}