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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 Traphandler
4 * Copyright (C) 2014 Free Electrons
5 * Copyright (C) 2014 Atmel
6 *
7 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
8 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
9 */
10
11#include <linux/media-bus-format.h>
12#include <linux/of_graph.h>
13
14#include <drm/drm_encoder.h>
15#include <drm/drm_of.h>
16#include <drm/drm_bridge.h>
17
18#include "atmel_hlcdc_dc.h"
19
20struct atmel_hlcdc_rgb_output {
21 struct drm_encoder encoder;
22 int bus_fmt;
23};
24
25static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
26 .destroy = drm_encoder_cleanup,
27};
28
29static struct atmel_hlcdc_rgb_output *
30atmel_hlcdc_encoder_to_rgb_output(struct drm_encoder *encoder)
31{
32 return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
33}
34
35int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder)
36{
37 struct atmel_hlcdc_rgb_output *output;
38
39 output = atmel_hlcdc_encoder_to_rgb_output(encoder);
40
41 return output->bus_fmt;
42}
43
44static int atmel_hlcdc_of_bus_fmt(const struct device_node *ep)
45{
46 u32 bus_width;
47 int ret;
48
49 ret = of_property_read_u32(ep, "bus-width", &bus_width);
50 if (ret == -EINVAL)
51 return 0;
52 if (ret)
53 return ret;
54
55 switch (bus_width) {
56 case 12:
57 return MEDIA_BUS_FMT_RGB444_1X12;
58 case 16:
59 return MEDIA_BUS_FMT_RGB565_1X16;
60 case 18:
61 return MEDIA_BUS_FMT_RGB666_1X18;
62 case 24:
63 return MEDIA_BUS_FMT_RGB888_1X24;
64 default:
65 return -EINVAL;
66 }
67}
68
69static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
70{
71 struct atmel_hlcdc_rgb_output *output;
72 struct device_node *ep;
73 struct drm_panel *panel;
74 struct drm_bridge *bridge;
75 int ret;
76
77 ep = of_graph_get_endpoint_by_regs(dev->dev->of_node, 0, endpoint);
78 if (!ep)
79 return -ENODEV;
80
81 ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
82 &panel, &bridge);
83 if (ret) {
84 of_node_put(ep);
85 return ret;
86 }
87
88 output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
89 if (!output) {
90 of_node_put(ep);
91 return -ENOMEM;
92 }
93
94 output->bus_fmt = atmel_hlcdc_of_bus_fmt(ep);
95 of_node_put(ep);
96 if (output->bus_fmt < 0) {
97 dev_err(dev->dev, "endpoint %d: invalid bus width\n", endpoint);
98 return -EINVAL;
99 }
100
101 ret = drm_encoder_init(dev, &output->encoder,
102 &atmel_hlcdc_panel_encoder_funcs,
103 DRM_MODE_ENCODER_NONE, NULL);
104 if (ret)
105 return ret;
106
107 output->encoder.possible_crtcs = 0x1;
108
109 if (panel) {
110 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
111 if (IS_ERR(bridge))
112 return PTR_ERR(bridge);
113 }
114
115 if (bridge) {
116 ret = drm_bridge_attach(&output->encoder, bridge, NULL);
117 if (!ret)
118 return 0;
119
120 if (panel)
121 drm_panel_bridge_remove(bridge);
122 }
123
124 drm_encoder_cleanup(&output->encoder);
125
126 return ret;
127}
128
129int atmel_hlcdc_create_outputs(struct drm_device *dev)
130{
131 int endpoint, ret = 0;
132 int attached = 0;
133
134 /*
135 * Always scan the first few endpoints even if we get -ENODEV,
136 * but keep going after that as long as we keep getting hits.
137 */
138 for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
139 ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
140 if (ret == -ENODEV)
141 continue;
142 if (ret)
143 break;
144 attached++;
145 }
146
147 /* At least one device was successfully attached.*/
148 if (ret == -ENODEV && attached)
149 return 0;
150
151 return ret;
152}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2014 Traphandler
4 * Copyright (C) 2014 Free Electrons
5 * Copyright (C) 2014 Atmel
6 *
7 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
8 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
9 */
10
11#include <linux/media-bus-format.h>
12#include <linux/of.h>
13#include <linux/of_graph.h>
14
15#include <drm/drm_bridge.h>
16#include <drm/drm_encoder.h>
17#include <drm/drm_of.h>
18#include <drm/drm_simple_kms_helper.h>
19
20#include "atmel_hlcdc_dc.h"
21
22struct atmel_hlcdc_rgb_output {
23 struct drm_encoder encoder;
24 int bus_fmt;
25};
26
27static struct atmel_hlcdc_rgb_output *
28atmel_hlcdc_encoder_to_rgb_output(struct drm_encoder *encoder)
29{
30 return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
31}
32
33int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder)
34{
35 struct atmel_hlcdc_rgb_output *output;
36
37 output = atmel_hlcdc_encoder_to_rgb_output(encoder);
38
39 return output->bus_fmt;
40}
41
42static int atmel_hlcdc_of_bus_fmt(const struct device_node *ep)
43{
44 u32 bus_width;
45 int ret;
46
47 ret = of_property_read_u32(ep, "bus-width", &bus_width);
48 if (ret == -EINVAL)
49 return 0;
50 if (ret)
51 return ret;
52
53 switch (bus_width) {
54 case 12:
55 return MEDIA_BUS_FMT_RGB444_1X12;
56 case 16:
57 return MEDIA_BUS_FMT_RGB565_1X16;
58 case 18:
59 return MEDIA_BUS_FMT_RGB666_1X18;
60 case 24:
61 return MEDIA_BUS_FMT_RGB888_1X24;
62 default:
63 return -EINVAL;
64 }
65}
66
67static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
68{
69 struct atmel_hlcdc_rgb_output *output;
70 struct device_node *ep;
71 struct drm_panel *panel;
72 struct drm_bridge *bridge;
73 int ret;
74
75 ep = of_graph_get_endpoint_by_regs(dev->dev->of_node, 0, endpoint);
76 if (!ep)
77 return -ENODEV;
78
79 ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
80 &panel, &bridge);
81 if (ret) {
82 of_node_put(ep);
83 return ret;
84 }
85
86 output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
87 if (!output) {
88 of_node_put(ep);
89 return -ENOMEM;
90 }
91
92 output->bus_fmt = atmel_hlcdc_of_bus_fmt(ep);
93 of_node_put(ep);
94 if (output->bus_fmt < 0) {
95 dev_err(dev->dev, "endpoint %d: invalid bus width\n", endpoint);
96 return -EINVAL;
97 }
98
99 ret = drm_simple_encoder_init(dev, &output->encoder,
100 DRM_MODE_ENCODER_NONE);
101 if (ret)
102 return ret;
103
104 output->encoder.possible_crtcs = 0x1;
105
106 if (panel) {
107 bridge = drm_panel_bridge_add_typed(panel,
108 DRM_MODE_CONNECTOR_Unknown);
109 if (IS_ERR(bridge))
110 return PTR_ERR(bridge);
111 }
112
113 if (bridge) {
114 ret = drm_bridge_attach(&output->encoder, bridge, NULL, 0);
115 if (!ret)
116 return 0;
117
118 if (panel)
119 drm_panel_bridge_remove(bridge);
120 }
121
122 drm_encoder_cleanup(&output->encoder);
123
124 return ret;
125}
126
127int atmel_hlcdc_create_outputs(struct drm_device *dev)
128{
129 int endpoint, ret = 0;
130 int attached = 0;
131
132 /*
133 * Always scan the first few endpoints even if we get -ENODEV,
134 * but keep going after that as long as we keep getting hits.
135 */
136 for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
137 ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
138 if (ret == -ENODEV)
139 continue;
140 if (ret)
141 break;
142 attached++;
143 }
144
145 /* At least one device was successfully attached.*/
146 if (ret == -ENODEV && attached)
147 return 0;
148
149 return ret;
150}