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.h>
10 #include <linux/of_graph.h>
11
12 #include <drm/drm_atomic_helper.h>
13 #include <drm/drm_bridge.h>
14 #include <drm/drm_of.h>
15 #include <drm/drm_panel.h>
16 #include <drm/drm_probe_helper.h>
17 #include <drm/drm_simple_kms_helper.h>
18
19 #include "fsl_dcu_drm_drv.h"
20 #include "fsl_tcon.h"
21
fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device * fsl_dev,struct drm_crtc * crtc)22 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
23 struct drm_crtc *crtc)
24 {
25 struct drm_encoder *encoder = &fsl_dev->encoder;
26 int ret;
27
28 encoder->possible_crtcs = 1;
29
30 /* Use bypass mode for parallel RGB/LVDS encoder */
31 if (fsl_dev->tcon)
32 fsl_tcon_bypass_enable(fsl_dev->tcon);
33
34 ret = drm_simple_encoder_init(fsl_dev->drm, encoder,
35 DRM_MODE_ENCODER_LVDS);
36 if (ret < 0)
37 return ret;
38
39 return 0;
40 }
41
fsl_dcu_drm_connector_destroy(struct drm_connector * connector)42 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
43 {
44 drm_connector_unregister(connector);
45 drm_connector_cleanup(connector);
46 }
47
48 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
49 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
50 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
51 .destroy = fsl_dcu_drm_connector_destroy,
52 .fill_modes = drm_helper_probe_single_connector_modes,
53 .reset = drm_atomic_helper_connector_reset,
54 };
55
fsl_dcu_drm_connector_get_modes(struct drm_connector * connector)56 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
57 {
58 struct fsl_dcu_drm_connector *fsl_connector;
59
60 fsl_connector = to_fsl_dcu_connector(connector);
61 return drm_panel_get_modes(fsl_connector->panel, connector);
62 }
63
64 static enum drm_mode_status
fsl_dcu_drm_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)65 fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
66 struct drm_display_mode *mode)
67 {
68 if (mode->hdisplay & 0xf)
69 return MODE_ERROR;
70
71 return MODE_OK;
72 }
73
74 static const struct drm_connector_helper_funcs connector_helper_funcs = {
75 .get_modes = fsl_dcu_drm_connector_get_modes,
76 .mode_valid = fsl_dcu_drm_connector_mode_valid,
77 };
78
fsl_dcu_attach_panel(struct fsl_dcu_drm_device * fsl_dev,struct drm_panel * panel)79 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
80 struct drm_panel *panel)
81 {
82 struct drm_encoder *encoder = &fsl_dev->encoder;
83 struct drm_connector *connector = &fsl_dev->connector.base;
84 int ret;
85
86 fsl_dev->connector.encoder = encoder;
87
88 ret = drm_connector_init(fsl_dev->drm, connector,
89 &fsl_dcu_drm_connector_funcs,
90 DRM_MODE_CONNECTOR_LVDS);
91 if (ret < 0)
92 return ret;
93
94 drm_connector_helper_add(connector, &connector_helper_funcs);
95 ret = drm_connector_register(connector);
96 if (ret < 0)
97 goto err_cleanup;
98
99 ret = drm_connector_attach_encoder(connector, encoder);
100 if (ret < 0)
101 goto err_sysfs;
102
103 return 0;
104
105 err_sysfs:
106 drm_connector_unregister(connector);
107 err_cleanup:
108 drm_connector_cleanup(connector);
109 return ret;
110 }
111
fsl_dcu_create_outputs(struct fsl_dcu_drm_device * fsl_dev)112 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
113 {
114 struct device_node *panel_node;
115 struct drm_panel *panel;
116 struct drm_bridge *bridge;
117 int ret;
118
119 /* This is for backward compatibility */
120 panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
121 if (panel_node) {
122 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
123 of_node_put(panel_node);
124 if (IS_ERR(fsl_dev->connector.panel))
125 return PTR_ERR(fsl_dev->connector.panel);
126
127 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
128 }
129
130 ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
131 if (ret)
132 return ret;
133
134 if (panel) {
135 fsl_dev->connector.panel = panel;
136 return fsl_dcu_attach_panel(fsl_dev, panel);
137 }
138
139 return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);
140 }
141