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
16 static const struct drm_encoder_funcs ast_vga_encoder_funcs = {
17 .destroy = drm_encoder_cleanup,
18 };
19
20 /*
21 * Connector
22 */
23
ast_vga_connector_helper_get_modes(struct drm_connector * connector)24 static 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, 4096, 4096);
40 if (count)
41 drm_set_preferred_mode(connector, 1024, 768);
42 }
43
44 return count;
45 }
46
ast_vga_connector_helper_detect_ctx(struct drm_connector * connector,struct drm_modeset_acquire_ctx * ctx,bool force)47 static 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
63 static 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
68 static 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
ast_vga_connector_init(struct drm_device * dev,struct drm_connector * connector)76 static int ast_vga_connector_init(struct drm_device *dev, struct drm_connector *connector)
77 {
78 struct ast_device *ast = to_ast_device(dev);
79 struct i2c_adapter *ddc;
80 int ret;
81
82 ddc = ast_ddc_create(ast);
83 if (IS_ERR(ddc)) {
84 ret = PTR_ERR(ddc);
85 drm_err(dev, "failed to add DDC bus for connector; ret=%d\n", ret);
86 return ret;
87 }
88
89 ret = drm_connector_init_with_ddc(dev, connector, &ast_vga_connector_funcs,
90 DRM_MODE_CONNECTOR_VGA, ddc);
91 if (ret)
92 return ret;
93
94 drm_connector_helper_add(connector, &ast_vga_connector_helper_funcs);
95
96 connector->interlace_allowed = 0;
97 connector->doublescan_allowed = 0;
98
99 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
100
101 return 0;
102 }
103
ast_vga_output_init(struct ast_device * ast)104 int ast_vga_output_init(struct ast_device *ast)
105 {
106 struct drm_device *dev = &ast->base;
107 struct drm_crtc *crtc = &ast->crtc;
108 struct drm_encoder *encoder = &ast->output.vga.encoder;
109 struct ast_connector *ast_connector = &ast->output.vga.connector;
110 struct drm_connector *connector = &ast_connector->base;
111 int ret;
112
113 ret = drm_encoder_init(dev, encoder, &ast_vga_encoder_funcs,
114 DRM_MODE_ENCODER_DAC, NULL);
115 if (ret)
116 return ret;
117 encoder->possible_crtcs = drm_crtc_mask(crtc);
118
119 ret = ast_vga_connector_init(dev, connector);
120 if (ret)
121 return ret;
122 ast_connector->physical_status = connector->status;
123
124 ret = drm_connector_attach_encoder(connector, encoder);
125 if (ret)
126 return ret;
127
128 return 0;
129 }
130