1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright 2015 Freescale Semiconductor, Inc.
4 *
5 * Freescale DCU drm device driver
6 */
7
8#include <linux/backlight.h>
9#include <linux/of_graph.h>
10
11#include <drm/drm_atomic_helper.h>
12#include <drm/drm_bridge.h>
13#include <drm/drm_of.h>
14#include <drm/drm_panel.h>
15#include <drm/drm_probe_helper.h>
16#include <drm/drm_simple_kms_helper.h>
17
18#include "fsl_dcu_drm_drv.h"
19#include "fsl_tcon.h"
20
21int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
22 struct drm_crtc *crtc)
23{
24 struct drm_encoder *encoder = &fsl_dev->encoder;
25 int ret;
26
27 encoder->possible_crtcs = 1;
28
29 /* Use bypass mode for parallel RGB/LVDS encoder */
30 if (fsl_dev->tcon)
31 fsl_tcon_bypass_enable(tcon: fsl_dev->tcon);
32
33 ret = drm_simple_encoder_init(dev: fsl_dev->drm, encoder,
34 DRM_MODE_ENCODER_LVDS);
35 if (ret < 0)
36 return ret;
37
38 return 0;
39}
40
41static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
42{
43 drm_connector_unregister(connector);
44 drm_connector_cleanup(connector);
45}
46
47static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
48 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
49 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
50 .destroy = fsl_dcu_drm_connector_destroy,
51 .fill_modes = drm_helper_probe_single_connector_modes,
52 .reset = drm_atomic_helper_connector_reset,
53};
54
55static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
56{
57 struct fsl_dcu_drm_connector *fsl_connector;
58
59 fsl_connector = to_fsl_dcu_connector(con: connector);
60 return drm_panel_get_modes(panel: fsl_connector->panel, connector);
61}
62
63static enum drm_mode_status
64fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
65 struct drm_display_mode *mode)
66{
67 if (mode->hdisplay & 0xf)
68 return MODE_ERROR;
69
70 return MODE_OK;
71}
72
73static const struct drm_connector_helper_funcs connector_helper_funcs = {
74 .get_modes = fsl_dcu_drm_connector_get_modes,
75 .mode_valid = fsl_dcu_drm_connector_mode_valid,
76};
77
78static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
79 struct drm_panel *panel)
80{
81 struct drm_encoder *encoder = &fsl_dev->encoder;
82 struct drm_connector *connector = &fsl_dev->connector.base;
83 int ret;
84
85 fsl_dev->connector.encoder = encoder;
86
87 ret = drm_connector_init(dev: fsl_dev->drm, connector,
88 funcs: &fsl_dcu_drm_connector_funcs,
89 DRM_MODE_CONNECTOR_LVDS);
90 if (ret < 0)
91 return ret;
92
93 drm_connector_helper_add(connector, funcs: &connector_helper_funcs);
94 ret = drm_connector_register(connector);
95 if (ret < 0)
96 goto err_cleanup;
97
98 ret = drm_connector_attach_encoder(connector, encoder);
99 if (ret < 0)
100 goto err_sysfs;
101
102 return 0;
103
104err_sysfs:
105 drm_connector_unregister(connector);
106err_cleanup:
107 drm_connector_cleanup(connector);
108 return ret;
109}
110
111int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
112{
113 struct device_node *panel_node;
114 struct drm_panel *panel;
115 struct drm_bridge *bridge;
116 int ret;
117
118 /* This is for backward compatibility */
119 panel_node = of_parse_phandle(np: fsl_dev->np, phandle_name: "fsl,panel", index: 0);
120 if (panel_node) {
121 fsl_dev->connector.panel = of_drm_find_panel(np: panel_node);
122 of_node_put(node: panel_node);
123 if (IS_ERR(ptr: fsl_dev->connector.panel))
124 return PTR_ERR(ptr: fsl_dev->connector.panel);
125
126 return fsl_dcu_attach_panel(fsl_dev, panel: fsl_dev->connector.panel);
127 }
128
129 ret = drm_of_find_panel_or_bridge(np: fsl_dev->np, port: 0, endpoint: 0, panel: &panel, bridge: &bridge);
130 if (ret)
131 return ret;
132
133 if (panel) {
134 fsl_dev->connector.panel = panel;
135 return fsl_dcu_attach_panel(fsl_dev, panel);
136 }
137
138 return drm_bridge_attach(encoder: &fsl_dev->encoder, bridge, NULL, flags: 0);
139}
140

source code of linux/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c