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 
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 
41 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
42 {
43 	struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
44 
45 	drm_connector_unregister(connector);
46 	drm_panel_detach(fsl_con->panel);
47 	drm_connector_cleanup(connector);
48 }
49 
50 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
51 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
52 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
53 	.destroy = fsl_dcu_drm_connector_destroy,
54 	.fill_modes = drm_helper_probe_single_connector_modes,
55 	.reset = drm_atomic_helper_connector_reset,
56 };
57 
58 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
59 {
60 	struct fsl_dcu_drm_connector *fsl_connector;
61 
62 	fsl_connector = to_fsl_dcu_connector(connector);
63 	return drm_panel_get_modes(fsl_connector->panel, connector);
64 }
65 
66 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
67 					    struct drm_display_mode *mode)
68 {
69 	if (mode->hdisplay & 0xf)
70 		return MODE_ERROR;
71 
72 	return MODE_OK;
73 }
74 
75 static const struct drm_connector_helper_funcs connector_helper_funcs = {
76 	.get_modes = fsl_dcu_drm_connector_get_modes,
77 	.mode_valid = fsl_dcu_drm_connector_mode_valid,
78 };
79 
80 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
81 				 struct drm_panel *panel)
82 {
83 	struct drm_encoder *encoder = &fsl_dev->encoder;
84 	struct drm_connector *connector = &fsl_dev->connector.base;
85 	int ret;
86 
87 	fsl_dev->connector.encoder = encoder;
88 
89 	ret = drm_connector_init(fsl_dev->drm, connector,
90 				 &fsl_dcu_drm_connector_funcs,
91 				 DRM_MODE_CONNECTOR_LVDS);
92 	if (ret < 0)
93 		return ret;
94 
95 	drm_connector_helper_add(connector, &connector_helper_funcs);
96 	ret = drm_connector_register(connector);
97 	if (ret < 0)
98 		goto err_cleanup;
99 
100 	ret = drm_connector_attach_encoder(connector, encoder);
101 	if (ret < 0)
102 		goto err_sysfs;
103 
104 	ret = drm_panel_attach(panel, connector);
105 	if (ret) {
106 		dev_err(fsl_dev->dev, "failed to attach panel\n");
107 		goto err_sysfs;
108 	}
109 
110 	return 0;
111 
112 err_sysfs:
113 	drm_connector_unregister(connector);
114 err_cleanup:
115 	drm_connector_cleanup(connector);
116 	return ret;
117 }
118 
119 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
120 {
121 	struct device_node *panel_node;
122 	struct drm_panel *panel;
123 	struct drm_bridge *bridge;
124 	int ret;
125 
126 	/* This is for backward compatibility */
127 	panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
128 	if (panel_node) {
129 		fsl_dev->connector.panel = of_drm_find_panel(panel_node);
130 		of_node_put(panel_node);
131 		if (IS_ERR(fsl_dev->connector.panel))
132 			return PTR_ERR(fsl_dev->connector.panel);
133 
134 		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
135 	}
136 
137 	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
138 	if (ret)
139 		return ret;
140 
141 	if (panel) {
142 		fsl_dev->connector.panel = panel;
143 		return fsl_dcu_attach_panel(fsl_dev, panel);
144 	}
145 
146 	return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL, 0);
147 }
148