1// SPDX-License-Identifier: MIT
2
3#include <drm/drm_atomic_state_helper.h>
4#include <drm/drm_edid.h>
5#include <drm/drm_modeset_helper_vtables.h>
6#include <drm/drm_print.h>
7#include <drm/drm_probe_helper.h>
8
9#include "ast_ddc.h"
10#include "ast_drv.h"
11
12/*
13 * Encoder
14 */
15
16static const struct drm_encoder_funcs ast_vga_encoder_funcs = {
17 .destroy = drm_encoder_cleanup,
18};
19
20/*
21 * Connector
22 */
23
24static int ast_vga_connector_helper_get_modes(struct drm_connector *connector)
25{
26 struct ast_connector *ast_connector = to_ast_connector(connector);
27 int count;
28
29 if (ast_connector->physical_status == connector_status_connected) {
30 count = drm_connector_helper_get_modes(connector);
31 } else {
32 drm_edid_connector_update(connector, NULL);
33
34 /*
35 * There's no EDID data without a connected monitor. Set BMC-
36 * compatible modes in this case. The XGA default resolution
37 * should work well for all BMCs.
38 */
39 count = drm_add_modes_noedid(connector, hdisplay: 4096, vdisplay: 4096);
40 if (count)
41 drm_set_preferred_mode(connector, hpref: 1024, vpref: 768);
42 }
43
44 return count;
45}
46
47static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector,
48 struct drm_modeset_acquire_ctx *ctx,
49 bool force)
50{
51 struct ast_connector *ast_connector = to_ast_connector(connector);
52 enum drm_connector_status status;
53
54 status = drm_connector_helper_detect_from_ddc(connector, ctx, force);
55
56 if (status != ast_connector->physical_status)
57 ++connector->epoch_counter;
58 ast_connector->physical_status = status;
59
60 return connector_status_connected;
61}
62
63static const struct drm_connector_helper_funcs ast_vga_connector_helper_funcs = {
64 .get_modes = ast_vga_connector_helper_get_modes,
65 .detect_ctx = ast_vga_connector_helper_detect_ctx,
66};
67
68static const struct drm_connector_funcs ast_vga_connector_funcs = {
69 .reset = drm_atomic_helper_connector_reset,
70 .fill_modes = drm_helper_probe_single_connector_modes,
71 .destroy = drm_connector_cleanup,
72 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
73 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
74};
75
76/*
77 * Output
78 */
79
80int ast_vga_output_init(struct ast_device *ast)
81{
82 struct drm_device *dev = &ast->base;
83 struct drm_crtc *crtc = &ast->crtc;
84 struct i2c_adapter *ddc;
85 struct drm_encoder *encoder;
86 struct ast_connector *ast_connector;
87 struct drm_connector *connector;
88 int ret;
89
90 /* DDC */
91
92 ddc = ast_ddc_create(ast);
93 if (IS_ERR(ptr: ddc))
94 return PTR_ERR(ptr: ddc);
95
96 /* encoder */
97
98 encoder = &ast->output.vga.encoder;
99 ret = drm_encoder_init(dev, encoder, funcs: &ast_vga_encoder_funcs,
100 DRM_MODE_ENCODER_DAC, NULL);
101 if (ret)
102 return ret;
103 encoder->possible_crtcs = drm_crtc_mask(crtc);
104
105 /* connector */
106
107 ast_connector = &ast->output.vga.connector;
108 connector = &ast_connector->base;
109 ret = drm_connector_init_with_ddc(dev, connector, funcs: &ast_vga_connector_funcs,
110 DRM_MODE_CONNECTOR_VGA, ddc);
111 if (ret)
112 return ret;
113 drm_connector_helper_add(connector, funcs: &ast_vga_connector_helper_funcs);
114
115 connector->interlace_allowed = 0;
116 connector->doublescan_allowed = 0;
117 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
118
119 ast_connector->physical_status = connector->status;
120
121 ret = drm_connector_attach_encoder(connector, encoder);
122 if (ret)
123 return ret;
124
125 return 0;
126}
127

source code of linux/drivers/gpu/drm/ast/ast_vga.c