1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
6 */
7
8 #include "mdp4_kms.h"
9
10 struct mdp4_lvds_connector {
11 struct drm_connector base;
12 struct drm_encoder *encoder;
13 struct device_node *panel_node;
14 struct drm_panel *panel;
15 };
16 #define to_mdp4_lvds_connector(x) container_of(x, struct mdp4_lvds_connector, base)
17
mdp4_lvds_connector_detect(struct drm_connector * connector,bool force)18 static enum drm_connector_status mdp4_lvds_connector_detect(
19 struct drm_connector *connector, bool force)
20 {
21 struct mdp4_lvds_connector *mdp4_lvds_connector =
22 to_mdp4_lvds_connector(connector);
23
24 if (!mdp4_lvds_connector->panel) {
25 mdp4_lvds_connector->panel =
26 of_drm_find_panel(mdp4_lvds_connector->panel_node);
27 if (IS_ERR(mdp4_lvds_connector->panel))
28 mdp4_lvds_connector->panel = NULL;
29 }
30
31 return mdp4_lvds_connector->panel ?
32 connector_status_connected :
33 connector_status_disconnected;
34 }
35
mdp4_lvds_connector_destroy(struct drm_connector * connector)36 static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
37 {
38 struct mdp4_lvds_connector *mdp4_lvds_connector =
39 to_mdp4_lvds_connector(connector);
40
41 drm_connector_cleanup(connector);
42
43 kfree(mdp4_lvds_connector);
44 }
45
mdp4_lvds_connector_get_modes(struct drm_connector * connector)46 static int mdp4_lvds_connector_get_modes(struct drm_connector *connector)
47 {
48 struct mdp4_lvds_connector *mdp4_lvds_connector =
49 to_mdp4_lvds_connector(connector);
50 struct drm_panel *panel = mdp4_lvds_connector->panel;
51 int ret = 0;
52
53 if (panel)
54 ret = drm_panel_get_modes(panel, connector);
55
56 return ret;
57 }
58
59 static enum drm_mode_status
mdp4_lvds_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)60 mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
61 struct drm_display_mode *mode)
62 {
63 struct mdp4_lvds_connector *mdp4_lvds_connector =
64 to_mdp4_lvds_connector(connector);
65 struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
66 long actual, requested;
67
68 requested = 1000 * mode->clock;
69 actual = mdp4_lcdc_round_pixclk(encoder, requested);
70
71 DBG("requested=%ld, actual=%ld", requested, actual);
72
73 if (actual != requested)
74 return MODE_CLOCK_RANGE;
75
76 return MODE_OK;
77 }
78
79 static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
80 .detect = mdp4_lvds_connector_detect,
81 .fill_modes = drm_helper_probe_single_connector_modes,
82 .destroy = mdp4_lvds_connector_destroy,
83 .reset = drm_atomic_helper_connector_reset,
84 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
85 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
86 };
87
88 static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
89 .get_modes = mdp4_lvds_connector_get_modes,
90 .mode_valid = mdp4_lvds_connector_mode_valid,
91 };
92
93 /* initialize connector */
mdp4_lvds_connector_init(struct drm_device * dev,struct device_node * panel_node,struct drm_encoder * encoder)94 struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
95 struct device_node *panel_node, struct drm_encoder *encoder)
96 {
97 struct drm_connector *connector = NULL;
98 struct mdp4_lvds_connector *mdp4_lvds_connector;
99
100 mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
101 if (!mdp4_lvds_connector)
102 return ERR_PTR(-ENOMEM);
103
104 mdp4_lvds_connector->encoder = encoder;
105 mdp4_lvds_connector->panel_node = panel_node;
106
107 connector = &mdp4_lvds_connector->base;
108
109 drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
110 DRM_MODE_CONNECTOR_LVDS);
111 drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
112
113 connector->polled = 0;
114
115 connector->interlace_allowed = 0;
116 connector->doublescan_allowed = 0;
117
118 drm_connector_attach_encoder(connector, encoder);
119
120 return connector;
121 }
122