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_of.h>
13 #include <drm/drm_panel.h>
14 #include <drm/drm_probe_helper.h>
15 
16 #include "fsl_dcu_drm_drv.h"
17 #include "fsl_tcon.h"
18 
19 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
20 {
21 	drm_encoder_cleanup(encoder);
22 }
23 
24 static const struct drm_encoder_funcs encoder_funcs = {
25 	.destroy = fsl_dcu_drm_encoder_destroy,
26 };
27 
28 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
29 			       struct drm_crtc *crtc)
30 {
31 	struct drm_encoder *encoder = &fsl_dev->encoder;
32 	int ret;
33 
34 	encoder->possible_crtcs = 1;
35 
36 	/* Use bypass mode for parallel RGB/LVDS encoder */
37 	if (fsl_dev->tcon)
38 		fsl_tcon_bypass_enable(fsl_dev->tcon);
39 
40 	ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
41 			       DRM_MODE_ENCODER_LVDS, NULL);
42 	if (ret < 0)
43 		return ret;
44 
45 	return 0;
46 }
47 
48 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
49 {
50 	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
51 
52 	drm_connector_unregister(connector);
53 	drm_panel_detach(fsl_con->panel);
54 	drm_connector_cleanup(connector);
55 }
56 
57 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
58 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
59 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
60 	.destroy = fsl_dcu_drm_connector_destroy,
61 	.fill_modes = drm_helper_probe_single_connector_modes,
62 	.reset = drm_atomic_helper_connector_reset,
63 };
64 
65 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
66 {
67 	struct fsl_dcu_drm_connector *fsl_connector;
68 
69 	fsl_connector = to_fsl_dcu_connector(connector);
70 	return drm_panel_get_modes(fsl_connector->panel);
71 }
72 
73 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
74 					    struct drm_display_mode *mode)
75 {
76 	if (mode->hdisplay & 0xf)
77 		return MODE_ERROR;
78 
79 	return MODE_OK;
80 }
81 
82 static const struct drm_connector_helper_funcs connector_helper_funcs = {
83 	.get_modes = fsl_dcu_drm_connector_get_modes,
84 	.mode_valid = fsl_dcu_drm_connector_mode_valid,
85 };
86 
87 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
88 				 struct drm_panel *panel)
89 {
90 	struct drm_encoder *encoder = &fsl_dev->encoder;
91 	struct drm_connector *connector = &fsl_dev->connector.base;
92 	int ret;
93 
94 	fsl_dev->connector.encoder = encoder;
95 
96 	ret = drm_connector_init(fsl_dev->drm, connector,
97 				 &fsl_dcu_drm_connector_funcs,
98 				 DRM_MODE_CONNECTOR_LVDS);
99 	if (ret < 0)
100 		return ret;
101 
102 	drm_connector_helper_add(connector, &connector_helper_funcs);
103 	ret = drm_connector_register(connector);
104 	if (ret < 0)
105 		goto err_cleanup;
106 
107 	ret = drm_connector_attach_encoder(connector, encoder);
108 	if (ret < 0)
109 		goto err_sysfs;
110 
111 	ret = drm_panel_attach(panel, connector);
112 	if (ret) {
113 		dev_err(fsl_dev->dev, "failed to attach panel\n");
114 		goto err_sysfs;
115 	}
116 
117 	return 0;
118 
119 err_sysfs:
120 	drm_connector_unregister(connector);
121 err_cleanup:
122 	drm_connector_cleanup(connector);
123 	return ret;
124 }
125 
126 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
127 {
128 	struct device_node *panel_node;
129 	struct drm_panel *panel;
130 	struct drm_bridge *bridge;
131 	int ret;
132 
133 	/* This is for backward compatibility */
134 	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
135 	if (panel_node) {
136 		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
137 		of_node_put(panel_node);
138 		if (IS_ERR(fsl_dev->connector.panel))
139 			return PTR_ERR(fsl_dev->connector.panel);
140 
141 		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
142 	}
143 
144 	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
145 	if (ret)
146 		return ret;
147 
148 	if (panel) {
149 		fsl_dev->connector.panel = panel;
150 		return fsl_dcu_attach_panel(fsl_dev, panel);
151 	}
152 
153 	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
154 }
155