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
fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device * fsl_dev,struct drm_crtc * crtc)21 int 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(fsl_dev->tcon);
32
33 ret = drm_simple_encoder_init(fsl_dev->drm, encoder,
34 DRM_MODE_ENCODER_LVDS);
35 if (ret < 0)
36 return ret;
37
38 return 0;
39 }
40
fsl_dcu_drm_connector_destroy(struct drm_connector * connector)41 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
42 {
43 drm_connector_unregister(connector);
44 drm_connector_cleanup(connector);
45 }
46
47 static 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
fsl_dcu_drm_connector_get_modes(struct drm_connector * connector)55 static 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(connector);
60 return drm_panel_get_modes(fsl_connector->panel, connector);
61 }
62
63 static enum drm_mode_status
fsl_dcu_drm_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)64 fsl_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
73 static 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
fsl_dcu_attach_panel(struct fsl_dcu_drm_device * fsl_dev,struct drm_panel * panel)78 static 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(fsl_dev->drm, connector,
88 &fsl_dcu_drm_connector_funcs,
89 DRM_MODE_CONNECTOR_LVDS);
90 if (ret < 0)
91 return ret;
92
93 drm_connector_helper_add(connector, &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
104 err_sysfs:
105 drm_connector_unregister(connector);
106 err_cleanup:
107 drm_connector_cleanup(connector);
108 return ret;
109 }
110
fsl_dcu_create_outputs(struct fsl_dcu_drm_device * fsl_dev)111 int 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(fsl_dev->np, "fsl,panel", 0);
120 if (panel_node) {
121 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
122 of_node_put(panel_node);
123 if (IS_ERR(fsl_dev->connector.panel))
124 return PTR_ERR(fsl_dev->connector.panel);
125
126 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
127 }
128
129 ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &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(&fsl_dev->encoder, bridge, NULL, 0);
139 }
140